We are providing you chemistry guess paper 2021 with important MCQs of Physics 2nd year 2021,important short questions of physics 2nd year chapter wise 2021,important long questions of physics 2nd year chapter wise 2021 and important numericals of physics 2nd year chapter wise 2021 as a alp Physics model papers 2021.
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2nd Year Physics ALP
Guess Paper 2021
Tick (✔)
the Correct Option
1) The SI unit of
electric intensity is
a) NC-1 ✔
b) Tesla c) N/M d) Coul / meter
2) Electric lines of
forces are parallel and equally spaced then electric field is
a) Weak b) Strong c)
Non uniform d) Uniform ✔
3) A charge of 1 C
experience a force of 10-6 N at a point then the electric intensity at that
point is a) 106NC-1b) 10-6NC-1c) 1NC-1 ✔
d) NC-1
4) The lines which
provide information about the electric force exerted on charged particles
are
a) Magnetic field
lines b) Electric field lines ✔ c) Tangent lines d) Curved
lines
5) The electric
field lines are closer where the field is
a) Strong ✔
b) Weak c) Uniform d) All of these
6) The electric
field created by positive charge is
a) Radially inward
b) Zero c) Circular d) Radially outward ✔
7) Another unit of
electric intensity is
a) V / A b) V / m ✔
c) V / C d) V / N
8) Which one of the
following can be taken as measure of electric field intensity
a) b) ✔c) d) None of these
9) The unit of
Electricity intensity other than NC-1
a) VA-1b) Vm-1 ✔
c) VC-1d) All of these
10) SI unit of
strength of electric field
a) J / C b) C / V c)
N / C ✔ d) All of these
11) Closeness of the
electric field lines is the measure of
a) Cirection of
field b) Strength of field ✔ c) both of these d) None of
these
12) NC-1 is the SI
unit of
a) Force b) Charge
c) Current d) Electric intensity ✔
13) Then maximum
value of flux is obtained if angle between and is
a) 900 b) 800 c)
1800 d) 00 ✔
14) Unit of electric
intensity of electric field is
a) JC-1b) JV-1✔
c) Jm-3d) JI-3
15) When an area is
held perpendicular to the field lines then the magnitude of electric flux is
a) Negative b)
Positive c) Maximum ✔ d) All of these
16) Electric flux
through a closed surface does not depend upon
a) Its shape b)
Medium ✔ c) Charge d) None
17) X-rays exhibit
the phenomenon of:
a) Interference b)
Diffraction c) Polarization d) All of these ✔
18) The continuous
X-rays spectrum is produced by:
a) Accelerated
electrons b) Decelerated electrons ✔ c) Inner shell electrons d)
Valence electrons 19) For rectification we use:
a) Transformer b)
Choke c) Diode ✔ d) Capacitor
20) In photovoltaic
cell current is directly proportional to:
a) Wavelength of
light b) Frequency of light c) Intensity of light ✔
d) Energy of light
21) 1 joule =
a) 6.25 × 1018 e V ✔
b) 6.30 × 1018 e V c) 7.25 ×
1018 e V d) 9.1 × 1018 e V
22) The electrons
volt is the unit of
a) Electric current
b) Electric energy ✔ c) Potential d) Potential
difference
23) Capacitance of a
capacitor does not depend upon
a) Distance between
plates b) Area of plates c) Electric field between plates ✔
d) Medium between plates
24) A capacitor is
perfect insulator for
a) Alternating
current b) Sparking current c) Eddy current d) Direct current ✔
25) Coulomb per volt
is called
a) Farad ✔
b) Ampere c) Joule d) Henry
26) The capacitance
of capacitor depends upon
a) Thickness of
plates b) Charges of plates c) Geometry of the capacitor ✔
d) All of these
27) Operational
amplifier can be used as:
a) Night switch b)
Comparator c) Amplifier d) All of the above ✔
28) The first
superconductor was discovered in:
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a) 1911 ✔
b) 1932 c) 1954 d) 1963
29) An example of
Ferromagnetic substance is:
a) Co ✔b)
Al c) Cu d) Bi
30) The numerical
value of green colour in colour code resistor is
a) 3 b) 4 c) 5 ✔
31) The color of
strips on a a carbon resistor from extreme left is yellow black and red
respectively its resistance is a) 4 kΩ ✔
b) 5 kΩ c) 6 kΩ d) 7 kΩ
32) In colour code
of resistance orange colour represents
a) 1 b) 2 c) 3 ✔
33) If fourth band
is missing on resistance its tolerance is
a) ± 5 b) ± 6 c) ± 7
d) ± 20% ✔
34) The current
always leads the voltage in an
a) RC circuit ✔
b) RL circuit c) RLC series circuit d) RLC parallel circuit
35) Colour code of
yellow colour is
a) 2 b) 3 c) 4 ✔
d) 5
36) Resistance
tolerance for gold colour is
a) 50% b) 30 %c) 5% ✔
d) 20 %
38) Kirchhoff's
first rule is based on conversation of
a) Energy b) Voltage
c) Charge ✔ d) Mass
39) Kirchhoff's
second rule is based on
a) Energy
conversation ✔ b) Mass conversation c) Charge
conversation d) Momentum conversation 40) The field inside a solenoid is given
by
a) ✔
b) c) d) All of these
41) The motional emf
is given by
a) qvB b) IBL c) eBL
d) vBL ✔
42) The rod of unit
length is moving at 300 through a magnetic field of 1 T . If velocity of rod is
1 m/s , then induced
emf in the rod will
be given by
a) 1 V b) 0.2 V c)
0.5 V ✔ d) 0.6 V
43) In current
carrying long solenoid the magnetic field produced does not depend upon
a) The radius of
solenoid ✔ b) Number of turns per unit length c) Current
flowing through solenoid d) All of the
above
44) The magnetic
field inside a current carrying long solenoid is
a) Non uniform b)
Weak c) Uniform and Strong ✔ d) Zero
45) The motional emf
in a conductor depends upon the.
a) Length b)
Orientation c) Magnetic field d) All of the above ✔
46) A rod of length
20 m is moving with 20 m/s in a direction perpendicular to magnetic field of 20
T what is the value of emf.
a) 2000 V b) 4000 V
c) 6000 V d) 8000 V ✔
47) The relation is
known as.
a) Ampere's lawb)
Faradya's law ✔ c) Lenz's law d) Kickoff's law
48) The negative
sign with induced emf in Faraday's law is in accordance with
a) Lenz's law ✔
b) Ampere's law c) Gauss's law d) Induced emf
49) Electromagnetic
Induction obeys Law of Conservation of
a) Charge b) Energy ✔
c) Momentum d) Mass
50) Lenz's law is a
consequence of the law of conservation of
a) Charge b) Current
c) Energy ✔ d) Momentum
51) Lenz's law deals
with
a) Magnitude of emf
b) Direction of emf c) Direction of induced current✔
d) Magnitude of induced current
52) Henry is SI unit
of
a) Current b)
Resistance c) Flux d) Self induction ✔
53) Mutual induction
between two coils depends upon their
a) Size b) Shape c)
Separation d) All of these ✔
54) Inductance of
the coil can be increased by using.
a) Paramagnetic core
b) Diamagnetic core c) Ferromagnetic core ✔ d) Antiferromagnetic core 55)
Mutual induction has a practical role in the performance of the
a) Radio Choke b)
Transformer ✔ c) A.C Generator d) D.C Generator
56) An inductor may
store energy in
a) Its magnetic
field ✔ b) Its electric field c) Its coil d) A neighboring
circuit
57) Energy density
is an inductor is .
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a) Directly
proportional to magnetic field b) Directly proportional to square of magnetic
field✔ c) Inversely
proportional to magnetic field d) Inversely proportional to square of
magnetic field
58) The Lorentz
force on a charged particle moving in electric field B is given by
a) F = FE + FB ✔
b) F = FE - FB c) F=FBFE d) All of these
59) The sum of
electric and magnetic force is called
a) Maxwell force b)
Lorentz force ✔ c) Newton's force d)
Centripetal force
60) Energy stored in
the inductor is .
a) b)
c) ✔
d)
61) If an inductor
has N turns of a coil and is magnetic flux through its each turn when current I
is following , then its self - inductance is given by L.
a) b) ✔
c) d)
62) Neutrons was
discovered by
a) Rutherford b)
Chadwick ✔ c) Becquerel d) Curie
63) Which of the
following is similar to electron
a) - particle ✔
b) -particles c) Neutrino d) Photon
64) Color television
emits
a) - rays b) y-rays
c) X- rays ✔ d) All of these
65) By emitting
particle and γ particle simultaneously the charge number of the nucleus
a) Losses by 1 b)
Losses by 2 c) Increases by 1 ✔ d) Increases by 2
66) Radioactivity
happens due to disintegration of
a) Nucleus ✔
b) Massc) Electrons d) Protons
67) Which one is
more energetic
a) -rays ✔
b) x-rays c) Ultra violet rays d) None of these
68) rays emitted
from radioactivity elements have speed
a) 1 X 107 ms-1b) 2
X 107 ms-1c) 3 X 107 ms-1d) 3 X 108 ms-1 ✔
69) -particles carry
a charge
a) -e b) +2e ✔
c) -2e d) no charge
70) When a particle
is emitted out of any nucleus then its mass number is
a) Unchanged ✔
b) Increased c) Decreased d) Infinite
71) When a nucleus
emits alpha particle its atomic mass decreases by
a) 3 b) 32 c) 4 ✔
d) 2
72) The mass of beta
particle is equal to mass of
a) Electron ✔
b) Proton c) Neutron d) Meson
73) Marie curie and
pierre curie discovered
a) Uranium b)
Polonium and radium ✔ c) Uranium and radium d) All
of these
74) Half life of the
iodine -131 is 8 days and its weight 20 mg. After 4 half lives the amount life
undecayed called a) 2.5 mg b) 1.25 mg ✔ c) 0.625 mg d) All of
these
75) After two
half-lives the number of decayed nuclei of an element are
a) b)
c) d) ✔
76) A device which
show the visible path of ionizing particle is called
a) Wilson cloud
Chamber ✔ b) Scalar c) G.M counter d) All of these
77) A high potential
difference of is used in G.M counter
a) 400 volts ✔
b) 40000 volts c) 5000 volts d) 4400 volts
78) The total amount
of energy radiated per unit orifice area of cavity radiator per unit time
proportional to a) T b) T2c) T3d) T4 ✔
79) A detector can
count fast and operate low voltage is
a) G.M counter b)
Solid state detector ✔ c) Bubble chamber d) All of
these
80) The dead time of
Geiger Muller counter is of the order
a) 10-1sb) 10-2sc)
10-3s d) 10-4s ✔
81) Nuclear fission
chain reaction is controlled by using
a) Steel rods b)
Graphite rods c) Cadimum rods ✔ d) None of these
82) Which of the
following belong to hadrons group
a) Proton ✔
b) Electron c) Muons d) All of these
84) Particles that
experience the strong nuclear force
a) Hadrons ✔
b) Leptons c) Photons d) Quarks
85) The particles
equal in mass or greater than protons are called
a) Leptons b)
Baryons ✔ c) Mesons d) Mouns
86) A pair of quark
and anti quark make a
a) Meson ✔
b) Harden c) Lepton d) Baryon
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87) Every particles
has corresponding antiparticles with
a) Same mass b)
Different mass c) Opposite mass d) Opposite mass ✔and Same mass 88) The number of types of quark is
a) 6✔
b) 5 c) 4 d) 2
89) Which of t he
following are not hadrons?
a) Muons ✔
b) Mesons c) Protons d) Neutrons
90) Absorbed Dose D
is defined as
a) M/E b) E/C c) C/m
d) E/M ✔
91) A proton consist
of quarks which are
a) 2 up 1 down ✔
b) 1 up 2 down c) all up d) all down
92) Which one is a
better shield against gamma rays
a) Wood b) Lead ✔
c) Water d) All of these
93) The building
blocks of protons and neutrons are called
a) Ions b) Quarks ✔
c) Positrons d) Electrons
94) The bombardment
of nitrogen with alpha particle will produce
a) Neutron b) Proton
✔ c) Positron d) Electron
95) The half life of
radon gas is
a) 3.8 hours b) 3.8
minutes c) 3.8 days ✔ d) All of these
96) The particles
which do not experience strong force are called
a) Leptons ✔
b) Mesons c) Hadrons d) Baryons
97) The force which
is responsible for the breaking up of the radioactive element is
a) Weak nuclear
force ✔ b) Strong nuclear force c) Electromagnetic force d)
Gravitational force
98) Various types of
cancer are treated by
a) Carbon - 14 b)
Nickel -63 c) Cobalt - 60✔ d) Strontium -90
99) The Rest Mass
Energy of an electrons pair is
a) 0.51 Mev b) 1.02
Mev ✔c) 1.2 Mev d) 1.00 Mev
100) 0.1 Kg mass
will be equivalent to energy
a) 5 x 108J b) 9 x
108J c) 8 x 108J d) 9 x 1016 J ✔
101) The specially
designed solid state detector can be used to detect
a) Alpha rays b)
Beta rays c) Gamma rays only ✔ d) X- rays only
102) The brightness
of the spot on CRO screen is controlled by
a) Cathode b) Anode
c) Grid✔ d) Plato
103) In CRO , the
output wave form of time base generator is
a) Circular b)
Square c) Sinusoidal d) Saw - tooth ✔
104) The velocity of
an oscillating charge as it moves to and fro along the wire is
a) Changing✔
b) Constant c) Infinite d) Zero
105) Cathode Ray
Oscilloscope works by deflecting beam of
a) Neutrons b)
Electrons ✔ c) Protons d) Positrons
106) The total
energy of electron in the state of the hydrogen atom is
a) Zero ✔
b) 3.2 ev c) 10.2 ev d) 13.6 ev
107) Filament in
C.R.O
a) Conductors ✔
b) Insulators c) Perfect conductors d) Perfect insulators
108) If an electron
of charge " e" is accelerated through a potential difference v , it
will acquire energy a) Ve ✔b) V/2 c) E/V d) Ve2
109) An electron in
H atom is excited from ground state on n=4 How many spectral lines are possible
in this case a) 6 ✔
b) 5 c) 4 d) 3
110) The function of
three anodes in a C.R.O is.
a) To accelerate
electrons only b) To focus the electrons only c) To control the brightness of
spot on screen d) To accelerate and
focus the electrons ✔
111) The radius of 10th
orbit in hydrogen atom is
a) 0.053 nm b) 0.053
m c) 5.3 nm ✔ d) 53 nm
112)
The numerical value
of ground state energy for hydrogen atom in electron volt is
a) 2.51ev b) - 0.85
ev c) 3.50 ev d) -13.6 ev ✔
113) When an
electron absorbs energy it jumps to
a) Lower energy
state b) Higher energy state ✔ c) Ground state d) Remains in
the same state 114) Speed of electron in
first bohr's orbit is
a) 2.19 x 106 ms-1 ✔
b) 2.19 x 10-6 ms-1 c) 2.19 x 106cms-1 d) None of these
115) Hydrogen atom
spectrum does not lie in
a) Ultra violet
region b) Visible region c) Infra and region d) X-ray region ✔
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116) If electrons
jumps from second orbit to first orbit in hydrogen atom it emits photon of
a) 3.40 eV b) 10.20
eV ✔ c) 13.6 eV d) 3.8 eV
117) The speed of an
electron in nth orbit is given as
a)
✔ b) c) d)
All of these
118) Which one of
the following radiation is extremely penetrating
a) Y- rays ✔
b) X- rays c) Alpha- rays d) Gamma- rays
119) In an
electronic transition an atom cannot emit
a) γ-rays ✔
b) Infared rays c) UV- rays d) X-rays
120) The Rest Mass
of X-rays photon is
a) 9.1 x 10-31kg b)
1.66 x 10-27 kg c) 1.6 x 10-19 kg d) Zero ✔
121) X-rays are
similar in nature to
a) Alpha rays b)
Beta rays c) Cathode rays d) Gamma rays ✔
122) X-rays photon
moves with a velocity of
a) Light ✔
b) Sound c) Force d) Power
123) X-rays are the
electromagnetic radiations having the wavelength in range
a) 10-10m ✔
b) 10-8m c) 10-5m d) 10-3m
124) Photos emitted
in inner shell transition are
a) Continuous X-rays
b) Discontinuous X-rays c) Characteristics X-rays ✔
d) None of these
125) In AVO meter
the current is measure when number of low resistance are connected with
galvanometer in a) Series b) Parallel ✔ c) Series and parallel d)
Perpendicular
126) Radiation
emitted by human body at normal temperature 370C lies in
a) X-rays region b)
Infra red region ✔ c) Visbile region d)
Ultraviolet region
127) Useful device
to measure resistance current and voltage is an electronic instrument called
a) Voltmeter b)
Ammeter c) Ohmmeter d) Digital ✔Multimeter
128) In an AC
circuit with resistor only the current and voltage have a phase difference of
a) 1800b) 900c) 00 ✔
d) 600
129) In pure
resistive AC circuit the instantaneous values of current and voltage are
a) In phase ✔
b) Out of phase c) Perpendicular to each other d) May or may not be in phase
130) Direct current
cannot flow through
a) Inductor b)
Resistor c) Transistor d) Capacitor ✔
131) The reactance
Xc of a capacitor C when connected across an AC source of frequency " f
" is given by
a) b) ✔ c) d)
132) In the
capacitive circuit connected to AC source, when q = 0 the slope of q-t curve is
a) Maximum ✔
b) Minimum c) Zero d) Negative
133) Capacitor will
have a large reactance at
a) Low frequency ✔
b) High frequency c) Zero frequecny d) Negative frequency
134) The slope of
q-t curve at any instant of time gives
a) Current ✔
b) Voltage c) Charge d) Both A & B
135) At high
frequency the value of reactance of capacitor will be
a) Small ✔
b) Zero c) Larged) Infinite
136) In case of
capacitor , the unit of reactance is
a) Ohm ✔
b) Mho c) Faradd) Henry
137) capacitor is
connected to an AC voltage of 24 V and frequency 50 Hz . The reactance of the
capacitor is a) b) 31.8 ✔ c) 34.8 d) 40
138) In pure
capacitor AC circuit , the current I and charge q are
a) In phase b) Out
of phase ✔ c) Parallel to each other d) None of these
139) A device that
allows only the flow of DC through a circuit is
a) Inductor ✔
b) Capacitor c) AC generator d) Transformer
140) Inductive
reactance of an inductor is
a) b) c) ✔
d)
141) A.C through
inductor , the applied voltage
a) Leads the current
by ✔ b) legs the current by c) And Current are in Phase d) And Current is
out of phase 1800
142) The reactance
of an inductor is
a) b) c) ✔
d) ✔
143) The phase
difference between current and voltage in an inductive circuit is
a) Zero b) 900 ✔
c) 1800d) 450
144) When an
inductor comes close to a metallic object , its inductance is
a) Decreased ✔b)
Increased c) Becomes half d) Becomes 4 items
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145) Which consumes
small power ?
a) Inductor ✔
b) Resistor c) Motor d) All of them
146) The inductiance
of a coil can be increased by using
a) Air as core
metrial b) Iron as core material ✔ c) Copper as core material d)
Bismith as core material 147) When an RC circuit is connected across a battery
amount of charge deposited on plates is ______ times the equilibrium charge after one time contant
a) 0.63 ✔
b) 0.67 c) 0.75 d) 0.86
148) In LC series
circuit the phase angle between XL and XC is
a) b)
c) d) ✔
149) The power
factor of an AC circuit is given by
a) cosθ ✔
b) sinθ c) tanθ d)
θ
150) The power
dissipated in AC circuit is given by P = Irms Vrms in this relation cos \theta
is called a) Phase factor b) Gain factor c) Loss factor d) Power factor ✔
151) The power
dissipation in AC circuit is expressed as
a) ✔
b) c)
d)
152) Power factor in
pure resistive circuit is
a) Largeb) Smallc)
Infinite d) One ✔
153) In RLC series
resonance circuit , at resonance frequency , impedance " Z " is
a) R ✔
b) XL c) √
d) √
154) In R-C-L series
circuit , the current at resonance frequency is
a) Minimum b) Zero
c) Maximum ✔ d) Infinite
155) At resonance
the value of current in RLC series circuit is equal to
a) ✔ b) c) V0R d) Zero
156) At resonance
frequency the impedance of RLC series circuit is
a) Zero b) Minimum ✔
c) Maximum d) Moderate
157) In RLC --
series circuit , at resonance frequency XC and XL are
a) In phase b)
Opposite in phase ✔ c) Differ by a phase d) At angle of 1200
158) In three phase
voltage across any two lines is about
a) 220 V b) 230 V c)
400 V✔ d) 430 V
159) In a three
phase AC generator the phase difference between each pair of coil is
a) 450b) 600c) 900d)
1200 ✔
160) Reciprocal of
bulk modulus is
a) Elasticity b)
Young modulus c) Compressibility ✔ d) Shear modulus
161) Nm-2 is also
called
a) Telsa b) Weber c)
Pascal ✔ d) Gauss
162) Shear modulus
is expressed as
a) c) ✔
c) d)
163) Dimensions of
strain are
a) L2b) L-2c)
ML-1T-2d) No dimensions ✔
164) How many
crystal system are there on the base of geomertic arrangements of the atoms
a) 3 b) 5 c) 4 d) 7 ✔
165) Out of the
following which material is brittle
a) High carbon steel
✔ b) Aluminum c) Copper d) Tungsten
166) Strain energy
in deformed material is proportional to
a) Square of the
extension b) Under root of the extension c) Cube root of the extension d)
Extension produced ✔
167) The amount of
energy stored in the wire when it is deformed
a) b)
c) ✔
d) None
168) The stress that
produces change in shape in known as
a) Tensile stressb)
Shear stress ✔ c) Volume stress d)
Longitudinal stress
169) Chose the
correct answer.
a) An elastic
deformation is reversible ✔ b) An elastic deformation is
irreversible c) A plastic deformation is
reversible d) An elastic deformation is permanent
170) Substances
which undergo plastic deformation until they break are known as
a) Brittle Substance
b) Non - Magnetic substance c) Ductile Substance ✔ d) Magnetic Substance 171)
Which of the following does not undergo plastic deformation ?
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a) Copper b) Iron c)
Lead d) Glass ✔
172) Substances
which break just after the elastic limit is reached area called as
a) Ductile
Substances b) Hard Substances c) Brittle Substances ✔
d) Soft Substances
173) The critical
temperature for mercury is
a) 7.2 k b) 4.2 k ✔
c) 1.18 k d) 3.7 k
174) The critical
temperature of aluminum is
a) 3.72 k b) 1.18 k ✔
c) 7.2 k d) 8.2 k
175) The substance
in which the atom do not form the magnetic dipoles are called
a) Diamagnetic ✔
b) Paramagnetic c) Ferromagnetic d) Crystals
176) The coercive
current is
a) Magnetizing
current b) Current due to holes c) Demagnetizing current ✔
d) Current due to ions 177) Domains are existed in
a) Ferromagnetic
materials ✔b) Paramagnetic materials c) Diamagnetic materials
d) Semi conductors 178) The most suitable metal for making permanent magnet is
a) Steel ✔
b) Iron c) Copper d) Aluminum
179) Pulsating DC
can be made smooth by using a circuit known as
a) Filter ✔
b) Tank c) Accepter d) All of these
180) In a half wave
rectifier the diode conducts during
a) Both halves of
input cycle b) A portion of positive half of input cycle c) A portion of
negative half of input cycle d) One half
of the input cycle ✔
181) Which diode
works at reverse biasing?
a) LED b) Photo
diode ✔ c) Photovoltaic cell d) Silicon diode
182) LED are made
from semiconductor:
a) Silicon b)
Germanium c) Carbon d) Gallium arsenide ✔
-
183) A sensor of
light is
a) Transistor b) LED
c) Diode d) Light dependent ✔resistor
184) The colour of
light emitted by a LED depends on
a) Its forward
biasing b) The amount of forward current c) The type of semi conductor material
use ✔ d) Its
reverse biasing
185) Photo diode is
used for detection of
a) Heat b) Charge c)
Light ✔ d) Current
186) Voltage gain of
the transistor as an amplifier is negative because of
a) Input voltage is
amplified b) Out put voltage is amplified c) Phase shift of 1800 ✔
d) Phase shift of 00
187) The gain of
transistor amplifier depends upon
a) Rc ✔
b) RB c) Vin d) Vo
188) Transistor can
be used as:
a) Amplifier b)
Switch ✔ c) Thermistor d) Both a and b ✔
189) A device which
converts low voltage(or current) to high voltage (or current) is called
a) Rectifier b)
Amplifier ✔ c) Transistor d) Diode
190) Which region is
grounded in a common emitter amplifier?
a) Base b) Emitter ✔
c) Collector d) None of these
191) The voltage
gain of the common emitter npn-transister is derived using:
a) Lenz's law b)
Kirchhoff's law ✔ c) Coulomb's law d) Faraday's
law
192) The Compton
shift in wavelength will be maximum when angle of scattering is
a) 300b) 450c) 900d)
1800 ✔
193) Integrated
amplifier is known as
a) Power amplifier
b) Pull-push amplifier c) Perational amplifier ✔ d) Current amplifier 194) The pair production is also called
a) Pair annihilation
b) Materialization of energy ✔ c) Fusion reaction d) Fission
reaction
195) Gain of
operational amplifier is independent of
a) Internal
structure ✔ b) External structure c) Batteries d) Potential
changes
196) The open loop
gain of an operational amplifier is of the order of
a) 108b) 105 ✔
c) 102d) 10-3
197) The device
which is used as amplifier and works with negative feedback is
a) Operational
amplifier ✔ b) n-p-n transistor c) p-n-p transistor d)
Transistor
198) The input
resistance of an op-amplifier is
a) Zero b) Low c)
High ✔ d) Equal to output resistance
199) Potassium
cathode in photocell emits electrons for a light
a) Visible ✔
b) Infrared c) Ultraviolet d) X-rays
200) Photoelectric
current depends on
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a) Intensity of
light ✔ b) Frequency of light c) Speed of light d)
Polarization of light
201) Gain of
non-inverting amplifier is given by:
a) G = - R2/R1 b) G
= R1/R2 c) G = 1 + R2/R1 ✔ d) G = 1 + R1/R2
202) Compton effect
observed with
a) x-rays ✔
b) Visible light c) Radio waves d) All of these
203) Compton shift
is equal to Compton wavelength when the scattered x-rays photons are observed
at an angle of a) 300b) 00c) 900 ✔
d) 600
204) An electric eye
operates because of
a) Compton effect b)
Photon refraction c) Photo electric effect d) I-Radiations ✔
205) Maximum kinetic
energy of photoelectrons depend upon of incident light
a) Frequency ✔
b) Intensity c) Brightness d) Power
206) The amount of
energy required to eject an electron from metal surface is called
a) Threshold
frequency b) Work function ✔ c) Pair production d) Compton
Effect
207) Production of
x-rays can be regarded for a photon to create an electron positron pair is
a) 1.02 Mev ✔
b) 1.51 Mev c) 1.22 Mev d) 1.15 Mev
208) The condition
hf > 2m0 C2 refers to
a) Compton Effect b)
Pair production ✔ c) Photoelectric effect d)
Annihilation of matter
209) The number of
electrons emitted depends upon
a) Color of target
surface b) Shape of surface c) Intensity of incident light ✔
d) Frequency of incident light 210) At
higher energies more than 1.02 Mev the dominant process is
a) Photoelectron
effect b) Compton Effect c) Pair production ✔ d) Nuclear fission
211) Disintegration
of photon on striking a nucleus into an electron and positron is
a) Annihilation of
matter b) Compton effect c) Pair production ✔ d) Photon electric effect
212) Two photons
approach each other their relative speed will be
a) 2 c ✔
b) 3 c c) c d) zero
213) Antiparticle of
electron is
a) Proton b) Photon
c) Neutron d) Positron ✔
214) In order to
increase the K.E of ejected photo electron there should be an increase in
a) Intensity of
radiation b) Wavelength of radiation c) Frequency of radiation ✔
d) Both b and c
215) The rest mass
energy of an electron positron pair is
a) 1.02 MeV✔
b) 0.21 MeV c) 0.31 MeV d) 0.41 MeV
216) Rest mass
energy of a positron is given by
a) 2 MeV b) 0.51 MeV✔
c) 1.02 MeV d) 5 MeV
217) The unit of
Compton shift is:
a) Js b) m✔
c) kg d) N
218) The existence
of Positron in 1928 was predicted by
a) Anderson b) Dirac
✔ c) Chadwick d) Plank
219) The maximum
kinetic energy of emitted photo electrons depends upon
a) The intensity of
incident light b) Frequency of incident light c) Metal surfaced) Both Frequency
of incident light and Metal surface✔
220) Who explained
the photo electric effect
a) Max plank ✔
b) Einstein c) Henry d) Rutherford
221) Wave length λ
associated with the particle of mass m and moving with the velocity v is
a) ✔ b) c) d)
None of these
222) Davisson and
Germer indicates in their experiment
a) Electron
polarization b) Electron diffraction ✔ c) Electron reflection d)
Electron refraction 223) The principle
regarding the dual nature of light was first discovered by
a) De-Broglie ✔b)
J.J Thomson c) Campton d) Heisenberg
224) Which one
experiment is the verification of wave nature of particle?
a) Compton effect b)
Davisson Germer experiment✔ c) Pair production d)
Photoelectric effect 225) We can find from de Broglie formula
a) Wave length ✔
b) Amplitude of wave c) speed of wave d) Frequency of wave
226) Wave nature of
light appears in
a) Pair production
b) Compton effect c) Speed of wave d) Interference ✔
227) ...has the
largest de Broglie wave length at same speed
a) Proton b) Alpha
particle c) Gamma particle d) Electron ✔
228) X-rays
diffraction reveals that these are
a) Particle type b)
Wave type✔ c) Both of these d) None of these
229) For a nucleus x
is given as 1.0 x 10-14 m If the electron remain inside the nucleus then its
vibrational velocity should be
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a) Less than the
speed of light b) Equal than the speed of light c) Greater than the speed of
light ✔ d) Double than
the speed of light
231) The product of
resistance and capacitance is :
a) velocity b)
forcec) acceleration d) time ✔
232) In a time
constant, the amount of charge deposit on a capacitor is:
a) 63% of
equilibrium charge✔ b) 37% of equilibrium charge
c) 69% of equilibrium charge d) 39% of equilibrium charge
233) The energy
stored in the capacitor is :
a) Magnetic energy
b) Electrical energy✔ c) Gravitational energy d)
Mechanical energy
234) Energy density
is:
a) Energy/volume ✔
b) Energy/time c) Energy/mass d) Energy/area
235) Will capacitor
store more energy with dielectric other than air?
a) No b) Yes ✔
c) May be or may be not d) None of these
236) The charging
time of capacitor depends upon
a) b) c)
RC ✔d) √
237) If potential
difference across the two plates of a parallel plate capacitor is doubled then
the energy stored in it will be
a) Doubled b) Halved
c) 4 times ✔ d) Constant
238) When some
dielectric is inserted between the plates of a capacitor then capacitance
a) Decrease b)
Increase ✔ c) Remain Constant d) Infinite
239) Which material
should be inserted between the plates of a capacitor in order to increase its
capacitance 9
a) Copper b) Tin c)
Mica ✔ d) Iron
240) The amount of
energy is equal to 1.6 × 10-19 J is called
a) Electron energy
b) Electric potential c) Electron volt ✔ d) Electric force
241) Gauss's law can
only be applied to:
a) A curved surface
b) A flat surface c) A closed surface ✔ d) Surface of any shape
242) Intensity of
field inside a hollow charged sphere will be
a) Negative b)
Positive c) Zero ✔ d) Infinity
243) Equation ⃗
⃗
is applicable to the surface
a) Conical b) Flat ✔
c) Spherical d) All of these
245) The magnitude
of electric intensity between near an infinite sheet of charge is
a) b)
c) ✔ d)
246) If a closed
surface contains two equal and opposite charges, the net electric flux from the
surface will be:
a) Positive b)
Negative c) Zero ✔ d) Both a and b
247) A rheostat can
be used as:
a) Capacitor b)
Potential divider ✔ c) Transistor d) Thermistor
249) Thermistor with
high negative temperature coefficient are very accurate for measuring low
temperature near a) 10K ✔ b) 10 oF c) 10 oC d) -10 oC
250) What is the
resistance of a carbon resistor which has bands brown black and brown
a) 100 ohm ✔
b) 1000 ohm c) 10 ohm d) 1.0 ohm
251)
Potentiometer can be
used as
a) Potential divider
✔ b) Ohmmeter c) Ammeter d) Both b and c
252) Potentiometer
practically draws current of amount:
a) Zero ✔
b) Smallc) Larged) Infinite
253) Wheatstone
bridge is an arrangement consisting of.............resistance
a) 2 b) 3 c) 4 ✔
d) 5
254) The resistance
of a 60 Watt bulb in a 120 V line is:
a) 20 ohm b) 2 ohm
c) 240 ohm ✔ d) 0.5 ohm
255) 1kWh =
a) 3 x 105Joule b)
3.6 x 106Joule ✔ c) 3.5 x 107Joule d) 3.6 x
107Joule
256) In CRO the gird
is at.........potential with respect to cathode
a) Positive b)
Negative ✔ c) Zero d) None of these
257) The number of
electrons accelerated by anodes in CRO is controlled by:
a) Anode b) Cathode
c) Filament d) Grid ✔
258) The unit of the
ratio of electric field to that of magnetic field is the same as that of
a) velocity ✔
b) acceleration c) mass d) time
259) In velocity
selector a charged particle will go undeflected if its velocity v is equal to
a) E+B b) EB c) E/B ✔
d) B/E
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ACCORDING TO ALP ND PHYSICS 2 260) When current pass through a solenoid it
behaves like a
a) Circular magnet
b) Bar Magnet ✔ c) Compass d) Wire
261) Magnetic field
intensity at a point due to the current carrying conductor can be determined
by a) Ampere's law ✔
b) Faraday's lawc) Ohm's law d) Newton's law
262) If the number
of turns become double but length remain same then magnetic field in the
solenoid become a) Zero b) Remain same ✔
c) Half d) Double
263) When a
conductor moves across a magnetic field, an emf is set up , this emf is called.
a) induced emf b)
mutual emf ✔ c) self emf d) motional emf
264) A metal rod of
2 m is moving at a speed of 1 ms-1 in a direction making an angle 300 with 0.5
T magnetic field . The emf produced is .
a) 0.1V b) 0.5V ✔
c) 1 V d) 2 V
265) Energy stored
per unit volume inside a solenoid is called
a) Electric flux b)
Energy density ✔ c) Workd) Power
266) Domains contain
atoms
a) 103 to 106 b) 106
to 109 c) 109 to 1012 d) 1012 to 1016 ✔
267) Best hard
magnetic material is made up of
a) Alnico V ✔
b) Iron c) Nickel d) Cobalt
268) The phase
difference between the input and output signal of an op-amp as an inverting
amplifier is: a) 0ob) 60oc) 90o d) 180o ✔
269) If an electron
jumps from nth orbit of energy En to pth orbit of energy Ep and a photon of
frequency f is emitted then
a) hf=En – Ep ✔
b) hf=EP.En c) hf=EP +En d) None of these
270) Application of
wave nature of particle is
a) Photodiode b)
Electron microscope ✔ c) Compound microscope d)
Photocell
271) When a metal is
heated sufficiently electrons are given off by the metal This phenomenon is
known as
a) Photoelectric
effect b) Piezoelectric effect c) Secondary emission d) Thermionic emission ✔
272) Compton shift
in the wave length will be minimum when angle of scattering is
a) 0o✔
b) 60oc) 90od) 270o
273) The
materialization of energy takes place in the process of
a) Photoelectric
effect b) Compton effect c) Pair production ✔ d) Annihilation of matter
274) Which nature of
light is revealed by photoelectric effect?
a) Dual b)
Corpuscular ✔ c) Waved) Elecromagnetic
275) The minimum
energy required for pair production is
a) 0.51 MeV b) 1.02
MeV ✔ c) 2. 52 MeV d) 3.2 MeV
276) According to
Heisenberg's first uncertainty principle ,the product of momentum and position
of a particle is approximatly equal
to
a) Stepahn's
constant b) Rydberg's constant c) Planck's constant ✔
d) Wein's constant
277) In order to
reduce uncertainty in momentum ,one must use light of
a) Short wavelength
b) Long wavelength ✔ c) Intermediate wavelength d)
Infinite wavelength
278) In order to
determine the position of an electron with more accuracy, we must use light of
a) Short wavelength ✔
b) Long wavelength c) Medium wavelength d) Infinite wavelength
279) Heisenberg
received Noble prize in:
a) 1920 b) 1940 c)
1925 d) 1932 ✔
280) The element
formed by radioactive decay is called
a)
Father element b) Mother
element c) Parent element d) Daughter element ✔
2nd Year
Physics Important Short Questions
Q.NO.2 (Short
Questions)
1. What is the
energy of a photon in a beam of infrared radiation of wavelength 1240 nm?
2. If decays twice by - emission , what is the
resulting isotope ?
3. Define mass
defect and binding energy ?
4. How much energy
released when 1 amu converted into energy ?
5. What do you
understand by radioactivity ?
6. Differentiate
between parent and daughter element ?
7. What is
radioactive decay ? Give an example ?
8. What is natural
radioactivity ? Name types of radiations emitted from radioactive elements ?
9. What will be the
change in mass number and charge number during alpha decay ?
10. What are
artificial radioactive elements?
11. Define half-life
and discuss its dependence ?
12. Define half-life
of radioactive element. How can you estimate the number of undecayed atoms
after n half
13. How and
particles may ionize an atom without directly hitting the electrons ? Explain .
14. Define
fluorescence . Name two fluorescence substances ?
15. Describe a brief
account of interaction of various types of radiations with matter ?
16. Write down two
advantages of solid state detector over Geiger Muller Counter ?
17. Discuss the
advantages and disadvantages of nuclear power compare to the use of fossil fuel
generated power ?
18. Define nuclear
fission . Give two examples of such a reaction.
19. Differentiate
between controlled and un-controlled chain reaction ?
20. Write down two
expected nuclear reactions for fission to indicate daughter nucleii ?
21. Explain briefly
fission chain reaction ?
22. Distinguish
between nuclear fission and nuclear fusion ?
23. State the
advantages and disadvantage of nuclear power ?
24. Write any two
uses of radiography ?
25. What is
radioactive tracer ? Describe on application in medicine and agriculture ?
26. Differentiate
between Baryons and Mesons ?
27. Protons and
neutrons are formed by what type of quarks ? Show the diagram ?
28. Differentiate
between Hadrons and Laptons ?
29. Write postulates
of Bohr's model of H-atom ?
30. Find speed of
electron in the 1st Bohr orbit ?
31. Differentiate
between characteristic X-rays and continuous X-rays.
32. Differentiate
between normal population and population inversion ?
33. Explain
de-Broglie's interpretation of Bohr's orbit to show that
34. Derive the
expression for the wavelength of the hydrogen spectrum using Bohr's third
postulate.
35. Briefly describe
the nature of radiations emitted from a radioactive materials.
36. What are black
body radiations and how can you get a black body ?
37. Give the
Planck's explanation of the radiation emitted by a black body.
38. Photoelectric
effect gives the evidence of the particle nature of light . Explain it how ?
39. What do you
understand by work function and stopping potential ?
40. Define Compton
Effect . Write formula of Compton shift for scattering angle ?
41. What is the
Compton shift in the wavelength of a photon scattered at an angle of 90o?
42. What is wave
particle duality ? Give its one practical use .
43. What changes
Heisenberg made in his uncertainity principles after more careful calculations?
44. Give the two
statements of uncertainity principle.
45. The life time of
an electron in an excited state is 10 s . What is its uncertainity in energy
during this time ?
46. Draw and discuss
the characteristic curve of photocurrent vs applied voltage for light of
different frequencies.
47. How the curve of
photocurrent and applied voltage varies for different intensities of
monochromatic light? Explain
48. State de Broglie
hypothesis and give its formula.
49. What is the
potential barrier ? What is the value of potential barrier of Si and Ge ?
50. What is the
effect of forward and reverse biassing of a diode on the width of depletion
region ?
51. What is the role
of potential barrier in a diode ? How is it formed in a diode ?
52. Draw a circuit
used for full wave rectification . Show direction of current in the circuit
when positive half of input AC cycle
passes through it ?
53. Describe the
variation of reverse current with the intensity of light exposed on a photo
diode using graph.
54. What is the
biasing requirement of the junctions of an n-p-n transistor for its normal
operation ?
55. Discuss the
types of a transistor.
56. Describe the
main characteristics of the three regions of a transistor.
57. Define voltage
gain of a transistor as an amplifier. Give its mathematical expression ?
58. Define input and
output resistance of an operational amplifier ?
59. Define Open Loop
gain of operational amplifier . Also give its formula ?
60. Write the
equation for the gain of inverting amplifier ?
61. Differentiate
between half wave and full wave rectification ?
62. Draw the circuit
diagram of operational amplifier as an inverting amplifier and label it.
63. Differentiate
between ductile and brittle substances . Give an example for each ?
64. Define ultimate
tensile stress ( UTS
65. Define Modulus
of Elasticity . Write down its three kinds ?
66. Compare the
electrical behavior of conductor and semi - conductor in terms of energy band
theory ?
67. Differentiate
between Insulators and Conductors ?
68. What are the two
main differences between conductors and semiconductors ?
69. Carbon , Silicon
and Germanium have four valence electrons . Why Carbon is insulator while
Silicon and Germanium are Semiconductors
?
70. What is the
difference between intrinsic and extrinsic semiconductors ?
Q.NO.3 (Short
Questions)
71. Differentiate
between p - type semiconductor and n - type semiconductor ?
72. Show that how n-
type semiconductor is formed from pure silicon with schematic diagram.
73. What is high
temperature superconductor? Give an example.
74. Distinguish
between soft magnetic materials and hard magnetic materials ?
75. Energy
dissipated per cycle for steel is more as compared to iron . Why ?
76. What is doping?
What is its effect on the electrical behaviour of a semiconductor?
77. Why is power
dissipated zero in pure inductive and pure capacitive circuit ?
78. Show that for RC
circuit , the angle between current and voltage is given as
79. How can you
establish the formula for power in A.C circuits ? Explain the role of power
factor in it ?
80. What is the
condition of resonance for RLC series resonance circuit? Also derive relation
of resonant frequency.
81. At resonance
frequency the impedance of RLC series circuit is only resistive . Why ?
82. Write the
conditions under which electromagnetic waves are produced from a source ?
83. Draw and discuss
current frequency diagram of RLC series resonance circuit.
84. State Faraday's
law of electromagnetic induction ?
85. Discuss briefly
that Lenz's law is exactly in accordance with the law of conversation of
energy.
86. State the Len's
Law ?
87. On what factors
, the mutual inductance of two coils depends ?
88. Define mutual
induction and mutual inductance.
89. Define
self-induction and mutual induction ?
90. What are the
factors on which maximum value of emf induced across terminals or armature of
an A.C generator depend ?
91. What happen to
the current of a circuit if a load resistance of the circuits is much less than
the power transferred ?
92. Write
characteristics of electric field lines ?
93. How sharks
locate their prey ? Explain briefly .
94. Define electric
flux . Write its SI units ?
95. What is the
orientation of the surface in an electric field to get maximum flux through it
?
96. What are the
factors upon which the electric flux depends ?
97. What is strength
of electric field inside a hollow charged sphere and why ?
98. What is
difference between electrical potential energy and electrical potential
difference ?
99. What is meant by
EEG and ERG ?
100. Define electric
potential difference with units ?
101. Show that
102. A particle
carrying a charge of 5e falls through a potential difference of 10.0V . What
will be then energy acquired by it ?
103. Differentiate
between electrical potential difference and electric potential at a point ?
104. Show that 1 eV
= 1.6 × 10-19 J .
105. Define
electrons volt , give its mathematical form ?
106. Convert 1 joule
into electron - volt ?
107. A particle
carrying a charge of 2e falls through a potential difference of 3.0V. Calculate
the energy acquired by it ?
108. When the
electrons fall through a potential difference of 1.0 Volt . Find its energy in
electron volts ?
109. Write the differences
between electrical and gravitational force ?
110. Why does
capacitance of a capacitor increase when a dielectric material is inserted
between its plates ?
111. How will
capacitance of parallel plate capacitor be affected if area of plates is doubled
and separation between them is halved ?
112. Define
dielectric constant and write its formula ?
113. Verify that an
ohm times Farad is equivalent to second ?
114. What depend on
the slow or fast charging and discharging of a capacitor ?
115. What is time
constant ?
116. How much is the
amount of charge at start of discharging of capacitor and start of charging of
a capacitor ?
117. Define
temperature coefficient of resistance . Give its unit ?
118. Can you
describe some substances whose resistance decrease with increase in
temperature?
119. What is meant
by Tolerance ? Also give one example .
120. Find the
resistance of a resistor with red , green , orange and gold respective bands ?
What is its tolerance?
121. A potential
difference is applied across the ends of a copper wire . What is the effect on
the drift velocity of the free electrons by increasing the potential difference
?
122. Why the
terminal potential difference of a battery decreases when the current drawn
from it is increased ?
123. What is the
difference between electromotive force and terminal potential difference ?
124. A potential
difference is applied across the ends of a copper wire . What is the effect on
the drift velocity of free electrons by decreasing the length and temperature
of the wire ?
125. Briefly
describe the current through a metallic conductor and drift velocity ?
126. Why does no
current pass through galvanometer in a balanced wheat stone bridge although the
two keys in the circuit are closed ?
127. Define Electric
power. Write its three equations for power dissipation in a resistor.
128. Define
Kirchhoff 2nd rule.
129. Distinguish
between magnetic flux and magnetic flux density . Write their SI units ?
130. Define magnetic
flux density and give its equation ?
131. Mention the
factors upon which magnetic flux depends ?
132. Why is B non -
zero outside a solenoid ?
133. State Ampere's
law . Write down its formula ?
134. Briefly give
the function of Filament , Cathode , Gird and plates in C.R.O. ?
135. Write any two
uses of CRO ?
136. What is the
function of grid in cathode ray oscilloscope ?
137. Draw Saw tooth
voltage wave form and describe it ?
138. What is Time
Base Generator ?
139. How can you
explain the waveform of various voltages formed in CRO ?
140. How the beam of
electron is focused on the screen of CRO ? Show it with diagram .
Q.NO.4 (Short
Questions)
141. How a current
carrying coil is to be placed in a magnetic field so that torque acting upon it
becomes zero ?
142. How can the
radius of electron trajectory be measured to determine e/m of an electron ?
143. What is an
amplifier? Show the biasing of transistor as a CE amplifier using circuit
diagram
144. Define energy
density. Write its expression for a capacitor.
145. On what factors
does the energy stored in a capacitor depend upon?
146. What is the
result of Millikan's oil drop method?
147. Is electron
volt a unit of potential difference or energy? Explain.
148. State Gauss's
law and write its mathematical expression.
149. Does the total
flux depend upon the shape or geometry of the closed surface ?
150. Suggest a
method to " shield " an apparatus from electric field even when it is
to be kept in the region where electric
field is present ?
151. How can a
rheostat be used as a variable resistor?
152. What is
thermistor? Describe its construction and uses.
153. Which is
preferred for measuring emf of a cell, a voltmeter or a potentiometer?
154. What is
potentiometer, gives its uses?
155. What is
Wheatstone bridge? How can it be used to determine an unknown resistance?
156. A potential
difference is applied across the ends of a copper wire . What is the effect on
the drift velocity of the free electrons by a
157. Why the
terminal potential difference of a battery decreases when the current drawn
from it is increased ?
158. Find the
resistance and tolerance of a resistor having color bands starting with brown ,
green , red and finishes with gold ?
What is its tolerance?
159. What is the
resistance of colour code resistor having colours yellow , white , orange and
silver respectively? What is its
tolerance ?
160. Is it possible
to orient a current loop in a uniform magnetic field such that the loop will
not tend to rotate ? Explain .
161. How can a
current loop be used to determine the presence of a magnetic field in a given
region of space ?
162. How the torque
is produced in current carrying rectangular coil?
163. State the
principle to determine the charge to mass ratio of an electron?
164. Suppose that a
charge " q " is moving in a uniform magnetic field with a velocity v
. Why is there no work done by the magnetic force that acts on the charge
" q " ?
165. A plane
conducting loop is located in a uniform magnet field that is directed along
x-axis for what orientation of loop is
flux, a maximum? For what orientation is flux, a minimum?
166. A current in a
conductor produces a magnetic field , which can be calculated by using Ampere's
law . Since current is defined as the rate of flow of charge , what can you
conclude about the magnetic field due to
stationary charges ? What about moving charges ?
167. At a given
instant , a proton moves in positive x direction in a region where there is a
magnetic field in the negative z direction . When is direction of magnetic
force ?
168. Why does the
picture on a TV screen become distorted when a magnet is brought near the
screen ?
169. How can we
determine the direction of magnetic field due to current carrying solenoid?
170. Can a charged
particle move through a magnetic field without experiencing any magnetic force
? If so then how ?
171. Does the
induced emf in a circuit depend on the resistance of the circuit? Does the
induced current depend on the resistance of the circuit?
172. A square loop
of wire is moving through a uniform magnetic field. The normal to the loop is
oriented parallel to the magnetic field.
Is emf induced in the loop? Give a reason for your answer ?
173. How would you
position a flat loop of wire in a changing magnetic field so that there is no
emf induced in the loop?
174. In a certain
region the earth's magnetic field point vertically down. When a plane north,
which wingtip is positively charged?
175. Is it possible
to change both the area of the loop and magnetic field passing through the loop
and still have no induced emf in the loop? Explain briefly .
176. Considering
induced emf produced by A.C generator of loop resistance R , correlate the
instantaneous emf and maximum emf . Also instantaneous current and maximum
current ?
177. A glass rod
length " L " is moving perpendicular to the applied magnetic field B
with velocity v. Explain briefly about
the induced emf in it ?
178. A light
metallic ring is released from above into a vertical bar magnet with South pole
to the upside. Does the current flow
clockwise or anticlockwise in the ring?
179. What is energy
density of solenoid? On what factors does it depend?
180. A circuit
contains an iron cored inductor, a switch and a DC source arranged in series.
The switch is closed and after an interval reopened. Explain why a spark jumps
across the switch contacts?
181. In R-L circuit,
will the current lead or lag the voltage? Illustrate your answer by a vector
diagram.
182. What is meant
by Hysteresis loss ? How is it used in the construction of transformer?
183. What is meant
by para, dia and ferromagnetic substances ? Give example for each ?
184. What is meant
by strain energy? How can it be determined from the force extension graph ?
185. Differentiate
between tensile and shear modes of stress and strian ?
186. Define stress
and strain . What are their SI units ?
187. How operational
amplifier is used as Comparator?
188. What is a light
dependent resistance? How does it work?
189. Why a
photodiode is operated in reverse biased state?
190. What is biasing
requirement of the junctions of a transistor for its normal operation? Explain
how these requirements are met in a
common emitter amplifier?
191. How does the
motion of an electron in an n-type substance differ from the motion of holes in
a p-type substance?
192. Bohr's theory
of hydrogen atom is based on several assumption. Do any of three assumptions
contradict classical physics?
193. Explain why
laser action could not occur without population inversion between atomic
levels?
194. As a solid is
heated and begins to glow , why does it first appear red ?
195. What happens to
the total radiations from a black body if its absolute temperature is doubled ?
196. When light
shines on surface , is momentum transferred to metal surface ?
197. If an electron
and proton have the same de-Broglie wavelength which particle has greater
speed?
198. We do not
notice the de-Broglie wavelength for a pitched cricket ball . Explain why ?
199. Is it possible
to create a single electron from energy ? Explain .
200. Does brightness
of beam of light primarily depends upon the frequency of photons or on the
number of
201. If the
following particles have same energy which has the shortest wavelength?
Electron, alpha particle, neutron and
proton.
202. What advantages
an electron microscope has over an optical microscope ?
203. When does light
behave as a wave ? When does light behaves as a particle ?
204. Why don't we
observe a Compton Effect with visible light ?
205. Will the bright
light eject more electrons from a metal surface then dimmer light of the same
colour?
206. A beam of red
light and a beam of blue light having exactly the same energy . Which beam
contains the greater number of photons?
207. Will higher
frequency light eject greater number of electrons than low frequency light ?
208. Since mass is a
form of energy, can we conclude that a compressed spring has more mass than the
same spring when it is not compressed.
209. Derive the
relation between energy and momentum of the electromagnetic radiations.
210. Why radio waves
are detected as continuous radiations and not by a radiation detector or
counter?
211. Why quantum
effects are only important for atomic sized objects?
212. A particle and
its anti-particle cannot exist together at one place. Why?
2nd Year
Physics ALP Important Long Questions 2021
1. What are
postulates of Bohr's model of the hydrogen atom? Derive formula for nth orbit
radius of Bohr atom model and show that
radii of hydrogen atom are quantized?
2. What is meant by
inner shell transitions & characteristic X-rays? How X-rays are produced?
Write down any two properties and uses
of X-rays.
3. What is
radioactive decay? Discuss emission of particle from radioactive nuclei in
detail.
4. What is Nuclear
Fission ? Explain Fission Chain Reaction in detail ?
5. What is nuclear
fusion ? Why this reaction has not been brought under control ? How sun is
issuing out tremendous amount of energy
?
6. What are the
black body radiations? Explain the intensity distribution diagram for the
radiations emitted from a black body.
7. Define
photoelectric effect. Describe the experiment for studying it and also give
explanation of the experimental results
on the basis of Quantum theory.
8. Explain
Heisenberg's Uncertainty Principles.
9. What is p-n
junction? How is it forward and reverse biased ? Draw circuits and give their
characteristics ?
10. Define Strain
Energy . Derive a relation for Strain Energy in deformed materials ?
11. Explain the
behaviour of A.C through an inductor . Also show that the reactance of a coil
depends upon the frequency of the A.C and inductance L .
12. Describe the
behaviour of R-L series circuit with an A.C source. Calculate the impedance and
phase angle by drawing the impedance diagram?
13. State Lenz's
law. Explain how it explains conservation of energy during electromagnetic
induction ?
14. Define electric
potential . Derive on equation for electric potential at a point due to a point
charge ?
15. Describe
Millikan's Oil drop method for determination of charge on an electron ?
16. Define
capacitance . Derive the expression for capacitance of a parallel plate
capacitor ?
17. What is the
capacitor ? Show that energy density for a capacitor which has electric field
strength E is given by
18. What is
capacitance? An expression for the capacitance of a parallel plate capacitor
when vacuum is present between the
plates of capacitor ?
19. State and
explain Kirchhoff's rules in detail.
20. What is wheat
stone bridge ? Describe its construction and working . How can it be used to
find the unknown resistance of a wire ?
21. What is
Potentiometer ? How it can be used as(i) Potential Divider (ii) Measuring of
emf of a cell
22. Derive an
expression for force acting on a current carrying conductor of length L placed
in a uniform magnetic field of strength B ?
23. Determine an
expression for the charge to mass ratio of an electron ?
24. What is Gauss's
law? Derive an expression for the electric field at a point near an infinite
sheet of charge.
25. Define A.C.
generator.Give its principle, construction and working derive an expression for
induced emf.
26. What is RLC
parallel circuit? Find the value of the resonance frequency and also write its
properties.
27. Distinguish
between extrinsic and intrinsic semiconductors. How would you obtain n-type and
p-type material from pure silicon?
Illustrate it by schematic diagram.
28. Describe the
formation of energy bands in solids. Explain the difference amongst electrical
behaviour of conductors , insulators and
semi - conductors in terms of energy band theory.
29. Define modulus
of elasticity . Show that units of modulus of elasticity and stress are same.
Also discuss its three
2nd Year
Important ALP NUMERICAL PROBLEMS 2021
1. A particle having
a charge of 20 electrons on it falls through a potential difference of 100
volts. Calculate the energy acquired by
it in electron volts (eV)
2. A capacitor has a
capacitance of 2.5 × 10-8F. In the charging process, electrons are removed from
one plate and placed on the other one.
When the potential difference between the plates is 450 V, ho many electrons have been transferred? (e = 1.6 ×
10-19 C
3. The potential
difference between the terminals of a battery in open circuit is 2.2 V. When it
is connected across a resistance of 50
Ω, the potential falls to 1.8 V. Calculate the current and the internal
resistance of the battery.
4. A platinum wire
has resistance of 10 Ω at 0oC and 20 Ω at 273oC. Find the value of temperature
coefficient of resistance of platinum.
5. The resistance of
an iron wire at 0oC is 1 × 104 Ω. What is the resistance at 500oC if the
temperature coefficient of resistance of
iron is 5.2 × 10-3 K-1?
6. 0.75 A current
flows through an iron wire when a battery of 1.5 V is connected across its
ends. The length of the wire is 5.0 m
and its cross sectional area is 2.5 × 10-7 m2. Compute the resistivity of iron.
7. A rectangular bar
of iron is 2 cm by c cm in cross section and 40 cm long . Calculate its
resistance if the resistivity of iron is
11 × 10-8 Ω m .
8. A solenoid 15.0
cm long has 300 turns of wire. A current of 5.0 A flows through it. What is the
magnitude of magnetic field inside the solenoid?
9. Find the radius
of an orbit of an electron moving at a rate of 2.0 × 107 ms-1in a uniform
magnetic field of 1.20 × 10-3T.
10. Alpha particles
ranging in speed from 1000 ms-1to 2000 ms-1enter into a velocity selector where
the electric intensity is 300 Vm-1and
the magnetic induction 0.20 T. Which particle will move undeviated through the field?
11. How fast must a
proton move in a magnetic field of 2.50 × 10-3T such that the magnetic force is
equal to its weight?
12. A coil of 0.1 m
× 0.1 m and of 200 turns carrying a current of 1.0 mA is placed in a uniform
magnetic field of 0.1 T. Calculate the maximum torque that acts on the coil.
13. A power line
10.0 m high carries a current 200 A. Find the magnetic field or the wire at the
ground.
14. A square coil of
side 16 cm has 200 turns and rotates in a uniform magnetic field of magnitude
0.05 T. If the peak emf is 12 V, what is
the angular velocity of the coil?
15. A coil of 10
turns and 35 cm2area is in a perpendicular magnetic field of 0.5 T. The coil is
pulled out of the field in 1.0 s. Find the induced emf in the coil as it is
pulled out of the field.
16. An alternating
source of emf 12 V and frequency 50 Hz is applied to a capacitor of capacitance
3 µF in series with a resistor of
resistance 1k Ω. Calculate the phase angle.
17. An indutor of
inductance 150 µH is connected in parallel with a variable capacitor whose
capacitance can be changed from 500 pF
to 20 pF. Calculate the maximum frequency and minimum frequency for which the circuit can be turned.
18. A 1.25 cm
diameter cylinder is subjected to a load of 2500 kg. Calculate the stress on
the bar in mega pascals.
19. A 1.0 m long
copper wire is subjected to stretching force and its length increases by 20 cm.
Calculate the tensile strain and the
percent elongation which the wire undergoes.
20. In a certain
circuit, the transistor has a collector current of 10 mA and a base current of
40 µA. What is the current gain of the transistor?
21. The current
flowing into the base of a transistor is 100 µA. Find its collector current IC,
its emitter current IE and the ratio
IC/IE if the value of current gain β is 100
22. Assuming you
radiate as does a blackbody at your body temperature about 37oC, at what
wavelength do you emit the most energy?
23. A 50 KeV photon
is Compton scattered by a quasi-free electron. If the scattered photon comes
off at 45o, what is its wavelength?
24. An electron is accelerated
through a Potential Difference of 50 V. Calculate its de Brogile wavelength.
25. The life time of
an electron in an excited state is about 10-8s. What is its uncertainty in
energy during this time?
26. An electron is
to be confined to a box of the size of the nucleus (1.0 × 10-14m
27. . What would the
speed of the electron be if it were so confined?
28. X-rays of
wavelength 22 pm are scattered from a carbon target. The scattered radiation
being viewed at 85 to the incident beam. What is Compton shift?
29. A 90 Kev x-ray
photon is fired at a carbon target and Compton scattering occurs. Find the
wavelength of the incident photon and
the wavelength of the scattered photon for scattering angle of (a ) 30o(b )
60o.
30. What is the
maximum wavelength of the two photons produced when a positron annihilates
an electron? The rest mass energy of
each is 0.51 MeV.
31. What is the
Broglie wavelength of an electron whose kinetic energy is 120 eV?
32. What are the
energies in eV of quanta of wavelength? λ = 400, 500 and 700 nm.
33. Electrons in an
X-ray tube are accelerated through a potential difference of 3000 V. If these
electrons were slowed down in a target, what will be the minimum wavelength of
X-rays produced?
34. A tungsten
target is struck by electrons that have been accelerated from rest through 40
kV potential differences. Fin the
shorter wavelength of the bremsstrahlung radiation emitted?
35. Find the speed
of electron in the First Bohr Orbit.
36. Find the mass
defect and binding energy of the deuteron nucleus. The experimental mass of
deuteron is 3.3435 × 10-27 kg.
37. Find the mass
defect and the binding energy for tritium, if the atomic mass of tritium is
3.016049 u.
38. A sheet of lead
5.0 mm thick reduces the intensity of beam of γ -rays by a factor 0.4. Find
half value thickness of lead sheet which
will reduce the intensity to half of its initial value?
39. You are asked to
design a solenoid that will give a magnetic field of 0.10 T, yet the current
must not exceed 10.0 A. Find the number of turns per unit length that the
solenoid should have.
40. An alternating
current generator operating at 50 Hz has a coil of 200 turns. The coil has an
area of 120 cm2 What should be the magnetic filed in which the coil rotates in
order to produce an emf of maximum value
of 240 volts?
.
41. A coil of wire
has 10 loops. Each loop has an area of 1.5 × 10-3 m2. A magnetic field is
perpendicular to the surface of each loop at all time. If the magnetic field is
changed from 0.05 T to 0.06 T in 0.1 s, find the average emf induced in the coil during this
time.
42. A solenoid has
250 turns and its self inductance is 2.4 mH. What is the flux through each turn when current is 2A? What is the induced
emf when the current changes at 20 As-1?
43. A solenoid of
length 8.0 cm and cross sectional area 0.5 cm2has 520 turns. Find the self
inductance of the solenoid when the core
is air. if the current in the solenoid increases through 1.5 A in 0.2 s, find
the magnitude of induced emf in it.
44. Like any field,
the earth's magnetic field stores energy. Find the magnetic energy stored in a
space where strength of earth's field is
7 × 10-5T, if the space occupies an area of 10 × 108 m2and has a height of 750 m.
45. A sinusoidal
A.C. has a maximum value of 15A. What are its rms values? If the time is
recorded from the instant the current is zero and is becoming positive, what is
the instantaneous value of the current after
1/300 s, given the frequency is 50 Hz.
46. Calculate the
gain of non-inverting amplifier shown in the fig.
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