PHYSICS- PAGE 9
1. Resolving power of telescope increases when
(A) wavelength of light decreases
(B) wavelength of light increases
(C) focal length of eye-piece increases
(D) focal length of eye-piece decreases
Ans: A
2. When light of wavelength '' λ is incident on photosensitive surface, the stopping potential is ‘V’. When light of wavelength ‘3λ ’ is incident on same surface, the stopping potential is 'V/6 . Threshold wavelength for the surface is _____λ
(A) 2
(B) 3
(C) 4
(D) 5
Ans: D
3. From Brewster’s law, except for polished metallic surfaces, the polarising angle
(A) depends on wavelength and is different for different colours
(B) independent of wavelength and is different for different colours
(C) independent of wavelength and is same for different colours
(D) depends on wavelength and is same for different colours
Ans: A
4. When an electron in Hydrogen atom revolves in stationary orbit, it
(A) does not radiate light though its velocity changes
(B) does not radiate light and velocity remains unchanged
(C) radiates light but its velocity is unchanged
(D) radiates light with the change of energy
Ans: A
5. In balanced metre bridge, the resistance of ridge wire is 0.1 Ω/cm. Unknown resistance ‘X’ is connected in left gap and 6 Ω in right gap, null point divides the wire in the ration 2 : 3. Find the current drawn the battery of 5 V having negligible resistance.
(A) 1 A (B) 1.5 A
(C) 2 A (D) 5 A
Ans: A
(A) wavelength of light decreases
(B) wavelength of light increases
(C) focal length of eye-piece increases
(D) focal length of eye-piece decreases
Ans: A
2. When light of wavelength '' λ is incident on photosensitive surface, the stopping potential is ‘V’. When light of wavelength ‘3λ ’ is incident on same surface, the stopping potential is 'V/6 . Threshold wavelength for the surface is _____λ
(A) 2
(B) 3
(C) 4
(D) 5
Ans: D
3. From Brewster’s law, except for polished metallic surfaces, the polarising angle
(A) depends on wavelength and is different for different colours
(B) independent of wavelength and is different for different colours
(C) independent of wavelength and is same for different colours
(D) depends on wavelength and is same for different colours
Ans: A
4. When an electron in Hydrogen atom revolves in stationary orbit, it
(A) does not radiate light though its velocity changes
(B) does not radiate light and velocity remains unchanged
(C) radiates light but its velocity is unchanged
(D) radiates light with the change of energy
Ans: A
5. In balanced metre bridge, the resistance of ridge wire is 0.1 Ω/cm. Unknown resistance ‘X’ is connected in left gap and 6 Ω in right gap, null point divides the wire in the ration 2 : 3. Find the current drawn the battery of 5 V having negligible resistance.
(A) 1 A (B) 1.5 A
(C) 2 A (D) 5 A
Ans: A
6:-For a conservative system, the slop of the potential energy versus position curve gives
A:-kinetic energy B:-force C:-power D:-momentum
Ans: B
7:-Are two simultaneous events, happening at the same point, simultaneous in all inertial frames ?
A:-yes B:-no C:-depends on the velocity of the frames D:-none of these
Ans: A 6
8:-The critical field of a superconductor at the critical temperature is
A:-inifinity B:-zero C:-finite D:-depends on the superconductor
Ans: B
9:-In a C60 fullerence molecule, how many pentagonal sides exist ?
A:-24 B:-6 C:-20 D:-12
Ans: D
10:-The open circuit voltage of a solar cell
A:-Increases with temperature first and then decreases B:-decreases with temperature first and then increases
C:-Decreases with temperature D:-Increases with temperature
Ans: C
11:-The bandwidth of an amplifier is the range of frequencies at the limits of which its voltage gain falls by _____ from the maximum gain. A:-1 dB B:-3 dB C:-9 dB D:-70 dB
Ans: B
12:-Which transistor configuration is commonly used for impedance matching ?
A:-common emitter B:-common base C:-common collector D:-common mode
Ans: C
13:-What is the hybridization in graphene ?
A:-sp B:-sp2 C:-sp3 D:-sp4
Ans: B
14:-What happens to the X-ray diffraction peaks from a polycrystalline solid, when its crystalline size decreases ?
A:-become broad B:-become narrow C:-no effect D:-disappears
Ans: A
15:-The fundamental effect that is used in the conversion of solar energy to heat energy is
A:-Photovoltaic effect B:-Faraday effect C:-Joule-Kelvin effect D:-Green house effect
Ans: D
16:-In biomass, the solar energy is stored in the form of
A:-electrical energy B:-heat energy C:-chemical energy D:-mechanical energy
Ans: C
17:-the dimensional of the phase space of a particle moving in a plane is
A:-4 B:-1 C:-2 D:-0
Ans: A
18:-Which among the following is an elementary particle ?
A:-neutron B:-kaon C:-electron D:-sigma
Ans: C
19:-The sodium D lines arise due to the transitions
A:-from P state to S state B:-from F state to S state C:-from F state to D state D:-from D state to S state
Ans: A
20:-The departure of relative permeability from unity is called
A:-Magnetic field strength B:-Magnetic susceptibility C:-Magnetic flux density D:-Magnetizing field intensity
Ans: B
21:-For a system of two coupled oscillators, the total number of normal modes is
A:-1 B:-2 C:-3 D:-4
Ans: B
22:-In the short wavelength limit, the schrödinger equation reduces to
A:-Lagrange's equation B:-Euler-Lagrange equation C:-Hamilton's equations D:-Hamilton-Jocobi equation
Ans: D
23:-What is the dimension of the fractal-Cantor set ?
A:-0.52 B:-0.63 C:-0.74 D:-0.85
Ans: B
24:-If [F, H] represents the Poisson bracket between an arbitrary function F and the Hamiltonian of a system H, the equation of motion will be
A:-`(dF)/(dt)` = [F, H] B:-`(dF)/(dt)` = [H, F]
C:-`(dF)/(dt) =(delF)/(delt) + [F, H]` D:-`(dF)/(dt) =(delF)/(delt) + [H, F]`
Ans: C
25:-The maximum number of rotational degrees of freedom possible for a rigid body is
A:-1 B:-2 C:-6 D:-3
Ans: D
26:-If `a_(0)` donates the Bohr radius, the most probable distance of the electron from the nucleus in a Hydrogen atom in its ground state is
A:-`(a_(0))/(2)` B:-`a_(0)` C:-`2a_(0)` D:-`(3a_(0))/(2)`
Ans: B
27:-When a particle of rest mass m attains the velocity of light, its mass becomes
A:-zero B:-m C:-infinity D:-2m
Ans: C
28:-If the Hall co-efficient of a specimen is positive, the current conduction in the specimen is dominated by
A:-electrons B:-phonons C:-photons D:-holes
Ans: D
29:-Application of time independent perturbations to linear stark effect of hydrogen atom
A:-Completely removes degeneracy of n = 2 level and splits it into four levels
B:-Partially removes degeneracy of n = 2 levels and splits it into three levels
C:-Partially removes degeneracy of n = 2 level and splits it into two levels
D:-Does not remove degeneracy to any extent
Ans: B
30:-In a first order phase transition, which among the following statements is true ?
A:-volume is continuous at the boundary B:-entropy is continuous at the boundary
C:-entropy is discontinuous at the boudnary D:-a latent heat is not involved
Ans: C
31:-The chemical potential of a photon gas is
A:-infinity B:-finite C:-imaginary D:-zero
Ans: D
32:-The total spin angular momentum S of a system of three electrons is
A:-`(1)/(2)` B:-0 and 1 C:-1 D:-`(1)/(2) and (3)/(2)`
Ans: D
33:-The light emission mechanism in LED is
A:-electroluminescence B:-photoluminescence C:-chemiluminescence D:-thermoluminescence
Ans: A
34:-For a Hermitian operator, the eigen values are
A:-zeros B:-real C:-complex D:-imaginary
Ans: B
35:-The eigen functions of angular momentum operator are
A:-Bessel function B:-Gamma function C:-Hermite polynomials D:-Spherical harmonics
Ans: D
36:-A charged particle is moving in a helical path under the influence of a constant magnetic field. The initial velocity of the particle is such that the component along the magnetic field is twice the component in the plane normal to the magnetic field. What will be the ratio of the pitch to the radius of the helical path ?
A:-`pi`/2 B:-`Pi` C:-2`pi` D:-4`pi`
Ans: D
37:-The bandgap energy of GaAs is about
A:-0.42 eV B:-1.42 eV C:-0.42 keV D:-1.42 keV
Ans: B
38:-The magnetic field at a distance R from a straight wire carrying a steady current I is proportional to
A:-I/R B:-IR C:-I/`R^(2)` D:-`I^(2)`/R
Ans: A
39:-Which of the following thermodynamic relation is correct ?
A:-dU = T dS + P dV B:-dU = T dS - P dV C:-dU = T dS + G dP D:-dU = T dS - G dP
Ans: B
40:-Which mode of electromagnetic radiation cannot propagate through a rectangular waveguide ?
A:-TE B:-TM C:-TEM D:-All the above
Ans: C
41:-Which is the least symmetric crystal system ?
A:-cubic B:-triclinic C:-orthorhombic D:-monoclinic
Ans: B
42:-The energy versus wave vector graph of an electron in free space is a
A:-Straight line B:-parabola C:-hyperbola D:-circle
Ans: B
43:-The substances, which are expected to show electron spin resonance spectroscopy, are
A:-paramagentic B:-diamagnetic C:-ferromagnetic D:-none of these
Ans: A
44:-The selection rule governing the transition between different energy levels in pure rotational Raman spectra, in terms of rotational quantum number J, is
A:-ΔJ = 0 or `+- 1` only B:-ΔJ = `+- 1` only C:-ΔJ = 0 or `+- 2` only D:-ΔJ = `+- 2` only
Ans: C
45:-In how many directions, the electrons in a quantum dot are confined ?
A:-1 B:-2 C:-3 D:-4
Ans: C
46:-The cut off frequency of T`E_(10)` dominant mode of an air filled rectangular wave guide of dimension x = 8 cm and y = 4 cm is 1875 MHz. What will be the cut off frequency of the T`E_(10)` dominant mode for another wave guide of dimension x = 8cm and y = 6 cm ? A:-1875 MHz B:-1945 MHz C:-707 MHz D:-1947 MHz
Ans: A
47:-The ratio of the electric field vector E and magnetic field vector H has the dimension of
A:-current B:-resistance C:-inductance D:-capacitance
Ans: B
48:-For the reverse leakage current of a BJT in CB (`I_(CBO)` ) and CE(`I_(CEO)` ) configuration, which among the following statements is true ?
A:-`I_(CBO)` > `I_(CEO)` B:-`I_(CBO)` = `I_(CEO)` C:-`I_(CBO)` < `I_(CEO)` D:-none of these
Ans: C
49:-The mass defect per nucleon is called
A:-packing fraction B:-quadrupole moment C:-angular momentum D:-binding energy
Ans: A
50:-For an ideal OPAMP integrator circuit, the peak value of output voltage
A:-is independent of frequency of the signal B:-decreases with frequency of the signal
C:-increases with frequency of the signal D:-decreases with amplitude of the signal
Ans: B
A:-kinetic energy B:-force C:-power D:-momentum
Ans: B
7:-Are two simultaneous events, happening at the same point, simultaneous in all inertial frames ?
A:-yes B:-no C:-depends on the velocity of the frames D:-none of these
Ans: A 6
8:-The critical field of a superconductor at the critical temperature is
A:-inifinity B:-zero C:-finite D:-depends on the superconductor
Ans: B
9:-In a C60 fullerence molecule, how many pentagonal sides exist ?
A:-24 B:-6 C:-20 D:-12
Ans: D
10:-The open circuit voltage of a solar cell
A:-Increases with temperature first and then decreases B:-decreases with temperature first and then increases
C:-Decreases with temperature D:-Increases with temperature
Ans: C
11:-The bandwidth of an amplifier is the range of frequencies at the limits of which its voltage gain falls by _____ from the maximum gain. A:-1 dB B:-3 dB C:-9 dB D:-70 dB
Ans: B
12:-Which transistor configuration is commonly used for impedance matching ?
A:-common emitter B:-common base C:-common collector D:-common mode
Ans: C
13:-What is the hybridization in graphene ?
A:-sp B:-sp2 C:-sp3 D:-sp4
Ans: B
14:-What happens to the X-ray diffraction peaks from a polycrystalline solid, when its crystalline size decreases ?
A:-become broad B:-become narrow C:-no effect D:-disappears
Ans: A
15:-The fundamental effect that is used in the conversion of solar energy to heat energy is
A:-Photovoltaic effect B:-Faraday effect C:-Joule-Kelvin effect D:-Green house effect
Ans: D
16:-In biomass, the solar energy is stored in the form of
A:-electrical energy B:-heat energy C:-chemical energy D:-mechanical energy
Ans: C
17:-the dimensional of the phase space of a particle moving in a plane is
A:-4 B:-1 C:-2 D:-0
Ans: A
18:-Which among the following is an elementary particle ?
A:-neutron B:-kaon C:-electron D:-sigma
Ans: C
19:-The sodium D lines arise due to the transitions
A:-from P state to S state B:-from F state to S state C:-from F state to D state D:-from D state to S state
Ans: A
20:-The departure of relative permeability from unity is called
A:-Magnetic field strength B:-Magnetic susceptibility C:-Magnetic flux density D:-Magnetizing field intensity
Ans: B
21:-For a system of two coupled oscillators, the total number of normal modes is
A:-1 B:-2 C:-3 D:-4
Ans: B
22:-In the short wavelength limit, the schrödinger equation reduces to
A:-Lagrange's equation B:-Euler-Lagrange equation C:-Hamilton's equations D:-Hamilton-Jocobi equation
Ans: D
23:-What is the dimension of the fractal-Cantor set ?
A:-0.52 B:-0.63 C:-0.74 D:-0.85
Ans: B
24:-If [F, H] represents the Poisson bracket between an arbitrary function F and the Hamiltonian of a system H, the equation of motion will be
A:-`(dF)/(dt)` = [F, H] B:-`(dF)/(dt)` = [H, F]
C:-`(dF)/(dt) =(delF)/(delt) + [F, H]` D:-`(dF)/(dt) =(delF)/(delt) + [H, F]`
Ans: C
25:-The maximum number of rotational degrees of freedom possible for a rigid body is
A:-1 B:-2 C:-6 D:-3
Ans: D
26:-If `a_(0)` donates the Bohr radius, the most probable distance of the electron from the nucleus in a Hydrogen atom in its ground state is
A:-`(a_(0))/(2)` B:-`a_(0)` C:-`2a_(0)` D:-`(3a_(0))/(2)`
Ans: B
27:-When a particle of rest mass m attains the velocity of light, its mass becomes
A:-zero B:-m C:-infinity D:-2m
Ans: C
28:-If the Hall co-efficient of a specimen is positive, the current conduction in the specimen is dominated by
A:-electrons B:-phonons C:-photons D:-holes
Ans: D
29:-Application of time independent perturbations to linear stark effect of hydrogen atom
A:-Completely removes degeneracy of n = 2 level and splits it into four levels
B:-Partially removes degeneracy of n = 2 levels and splits it into three levels
C:-Partially removes degeneracy of n = 2 level and splits it into two levels
D:-Does not remove degeneracy to any extent
Ans: B
30:-In a first order phase transition, which among the following statements is true ?
A:-volume is continuous at the boundary B:-entropy is continuous at the boundary
C:-entropy is discontinuous at the boudnary D:-a latent heat is not involved
Ans: C
31:-The chemical potential of a photon gas is
A:-infinity B:-finite C:-imaginary D:-zero
Ans: D
32:-The total spin angular momentum S of a system of three electrons is
A:-`(1)/(2)` B:-0 and 1 C:-1 D:-`(1)/(2) and (3)/(2)`
Ans: D
33:-The light emission mechanism in LED is
A:-electroluminescence B:-photoluminescence C:-chemiluminescence D:-thermoluminescence
Ans: A
34:-For a Hermitian operator, the eigen values are
A:-zeros B:-real C:-complex D:-imaginary
Ans: B
35:-The eigen functions of angular momentum operator are
A:-Bessel function B:-Gamma function C:-Hermite polynomials D:-Spherical harmonics
Ans: D
36:-A charged particle is moving in a helical path under the influence of a constant magnetic field. The initial velocity of the particle is such that the component along the magnetic field is twice the component in the plane normal to the magnetic field. What will be the ratio of the pitch to the radius of the helical path ?
A:-`pi`/2 B:-`Pi` C:-2`pi` D:-4`pi`
Ans: D
37:-The bandgap energy of GaAs is about
A:-0.42 eV B:-1.42 eV C:-0.42 keV D:-1.42 keV
Ans: B
38:-The magnetic field at a distance R from a straight wire carrying a steady current I is proportional to
A:-I/R B:-IR C:-I/`R^(2)` D:-`I^(2)`/R
Ans: A
39:-Which of the following thermodynamic relation is correct ?
A:-dU = T dS + P dV B:-dU = T dS - P dV C:-dU = T dS + G dP D:-dU = T dS - G dP
Ans: B
40:-Which mode of electromagnetic radiation cannot propagate through a rectangular waveguide ?
A:-TE B:-TM C:-TEM D:-All the above
Ans: C
41:-Which is the least symmetric crystal system ?
A:-cubic B:-triclinic C:-orthorhombic D:-monoclinic
Ans: B
42:-The energy versus wave vector graph of an electron in free space is a
A:-Straight line B:-parabola C:-hyperbola D:-circle
Ans: B
43:-The substances, which are expected to show electron spin resonance spectroscopy, are
A:-paramagentic B:-diamagnetic C:-ferromagnetic D:-none of these
Ans: A
44:-The selection rule governing the transition between different energy levels in pure rotational Raman spectra, in terms of rotational quantum number J, is
A:-ΔJ = 0 or `+- 1` only B:-ΔJ = `+- 1` only C:-ΔJ = 0 or `+- 2` only D:-ΔJ = `+- 2` only
Ans: C
45:-In how many directions, the electrons in a quantum dot are confined ?
A:-1 B:-2 C:-3 D:-4
Ans: C
46:-The cut off frequency of T`E_(10)` dominant mode of an air filled rectangular wave guide of dimension x = 8 cm and y = 4 cm is 1875 MHz. What will be the cut off frequency of the T`E_(10)` dominant mode for another wave guide of dimension x = 8cm and y = 6 cm ? A:-1875 MHz B:-1945 MHz C:-707 MHz D:-1947 MHz
Ans: A
47:-The ratio of the electric field vector E and magnetic field vector H has the dimension of
A:-current B:-resistance C:-inductance D:-capacitance
Ans: B
48:-For the reverse leakage current of a BJT in CB (`I_(CBO)` ) and CE(`I_(CEO)` ) configuration, which among the following statements is true ?
A:-`I_(CBO)` > `I_(CEO)` B:-`I_(CBO)` = `I_(CEO)` C:-`I_(CBO)` < `I_(CEO)` D:-none of these
Ans: C
49:-The mass defect per nucleon is called
A:-packing fraction B:-quadrupole moment C:-angular momentum D:-binding energy
Ans: A
50:-For an ideal OPAMP integrator circuit, the peak value of output voltage
A:-is independent of frequency of the signal B:-decreases with frequency of the signal
C:-increases with frequency of the signal D:-decreases with amplitude of the signal
Ans: B
51:-In a 4 bit R-2R ladder digital to analog converter, R = 10kΩ and `V_(ref)` is 10V. The current resolution of the converter is
A:-10.5 `muA` B:-50.25 `muA` C:-62.5 `muA` D:-6.25`muA`
Ans: C
52:-In the expression for the binding energy of a nucleus according to the liquid drop model, which among the following terms arises due to Pauli's exclusion principle ?
A:-volume term B:-surface term C:-pairing term D:-asymmetry term
Ans: D
53:-The strangeness quantum number S, in the Quark Model for up (u) and down (d) quarks are
A:-zero for both u and d B:-+1 for both u and d C:--1 for both u and d D:--1 for u and +1 for d
Ans: A
54:-In a canonical ensemble, the elements differ in their
A:-volume B:-energy C:-temperature D:-number of particles
Ans: B
55:-The Halmholtz free energy F, absolute temperature T and partition function Z of a canonical ensemble are related as
A:-F = - kT ln Z B:-F = kT ln Z C:-F = - kTZ D:-F = kTZ
Ans: A
56:-The maximum number of eigen values of an n `xx` n matrix is
A:-n B:-`n^(2)` C:-2n D:-`(1)/(2)n(n-1)`
Ans: A
57:-Which among the following is a mathematically incorrect operation ?
A:-grad div B:-div curl C:-grad curl D:-curl grad
Ans: C
58:-In cylindrical co-ordinates, where surface `rho` = 3 and z = 2 intersect is
A:-a finite plane B:-a semi infinite plane C:-a cylinder D:-a circle
Ans: D
59:-For a Fourier transform, which of the following statements is correct ``?
A:-FT of an even function is even and that of an odd function is odd
B:-FT of an even function is odd and the of an odd function is even
C:-FT of an even function is even and that of an odd function is even
D:-FT of an even function is odd and that of an odd function is odd
Ans: A
60:-The complex function `Z^((1)/(2))` is
A:-single valued B:-double valued C:-n-valued D:-2n-valued
Ans: B
61:-For a system in which the Lagrangian is not an explicit function of time, the Hamiltonian is
A:-constant B:-infinity C:-zero D:-none of these
Ans: A
62. Who discovered Gamma rays ?
(A) Paul Villand
(B) Marie Curie
(C) J.J. Thompson
(D) Adam Osborne
Ans: A
63. The sharpness of a television image is termed as its
(a) clarity
(b) colour
(c) resolution
(d) graphics
Ans: C
64. In Frenel form of diffraction, the distance between be screen and the obstacle is
(A) zero
(B) infinite
(C) finite
(D) none of the above
Ans: C
65. In case of Fraunhofer diffraction, we get fringed image of
(A) source
(B) obstacle
(C) aperture
(D) none of the above
Ans: A
A:-10.5 `muA` B:-50.25 `muA` C:-62.5 `muA` D:-6.25`muA`
Ans: C
52:-In the expression for the binding energy of a nucleus according to the liquid drop model, which among the following terms arises due to Pauli's exclusion principle ?
A:-volume term B:-surface term C:-pairing term D:-asymmetry term
Ans: D
53:-The strangeness quantum number S, in the Quark Model for up (u) and down (d) quarks are
A:-zero for both u and d B:-+1 for both u and d C:--1 for both u and d D:--1 for u and +1 for d
Ans: A
54:-In a canonical ensemble, the elements differ in their
A:-volume B:-energy C:-temperature D:-number of particles
Ans: B
55:-The Halmholtz free energy F, absolute temperature T and partition function Z of a canonical ensemble are related as
A:-F = - kT ln Z B:-F = kT ln Z C:-F = - kTZ D:-F = kTZ
Ans: A
56:-The maximum number of eigen values of an n `xx` n matrix is
A:-n B:-`n^(2)` C:-2n D:-`(1)/(2)n(n-1)`
Ans: A
57:-Which among the following is a mathematically incorrect operation ?
A:-grad div B:-div curl C:-grad curl D:-curl grad
Ans: C
58:-In cylindrical co-ordinates, where surface `rho` = 3 and z = 2 intersect is
A:-a finite plane B:-a semi infinite plane C:-a cylinder D:-a circle
Ans: D
59:-For a Fourier transform, which of the following statements is correct ``?
A:-FT of an even function is even and that of an odd function is odd
B:-FT of an even function is odd and the of an odd function is even
C:-FT of an even function is even and that of an odd function is even
D:-FT of an even function is odd and that of an odd function is odd
Ans: A
60:-The complex function `Z^((1)/(2))` is
A:-single valued B:-double valued C:-n-valued D:-2n-valued
Ans: B
61:-For a system in which the Lagrangian is not an explicit function of time, the Hamiltonian is
A:-constant B:-infinity C:-zero D:-none of these
Ans: A
62. Who discovered Gamma rays ?
(A) Paul Villand
(B) Marie Curie
(C) J.J. Thompson
(D) Adam Osborne
Ans: A
63. The sharpness of a television image is termed as its
(a) clarity
(b) colour
(c) resolution
(d) graphics
Ans: C
64. In Frenel form of diffraction, the distance between be screen and the obstacle is
(A) zero
(B) infinite
(C) finite
(D) none of the above
Ans: C
65. In case of Fraunhofer diffraction, we get fringed image of
(A) source
(B) obstacle
(C) aperture
(D) none of the above
Ans: A
66. A projectile is shown with speed u making angle θ with horizontal at t = 0. It just crosses two points at two equal heights at t = 1 s and
t = 3 s respectively. Maximum height attained by it is _______. (g = 10 m/s2)
(a) 5 m (b) 10 m (c) 15 m (d) 20 m
Ans: D
67. The SI standard of time is based on
(a) the daily rotation of the earth
(b) the yearly revolution of earth about the sun
(c) a precision pendulum clock
(d) None of these
Ans: D
68. While walking on ice, one should take small steps to avoid slipping. This is because smaller steps ensure
(a) larger friction (b) smaller friction (c) larger normal force (d) smaller normal force
Ans: B
69. The average force necessary to stop a hammer with 25 Ns momentum in 0.04 second is
(a) 625 N (b) 125 N (c) 50 N (d) 25 N
Ans: A
70. A dielectric slab is inserted between the plates of an isolated capacitor. The force between the plates will
(a) increase (b) decrease
(c) remains constant (d) become zero
Ans: C
71. As the temperature of a metallic wire is increased, the product of its resistivity and conductivity
(a) increases (b) decreases
(c) remains constant (d) may increase or decrease
Ans: C
72. For an infinite sheet of positive charge, the electric field lines
(a) run parallel to the sheet of charge.
(b) are perpendicular to the sheet of charge and point in towards the sheet.
(c) are perpendicular to the sheet of charge and point away from the sheet.
(d) fall off as 1/r2
Ans: B
73. While applying Kirchhoff’s law to electronic circuit, assumed direction of current flow must be
(a) clockwise (b) anticlockwise
(c) from left to right (d) either (a) or (b)
Ans: D
74. A carbon resistor (47 ± 4.7) kΩ is to be marked with rings of different colours for its identification. The colour code sequence will be (a) Green – Orange – Violet – Gold
(b) Violet – Yellow – Orange – Gold
(c) Yellow – Violet – Orange – Silver
(d) Yellow – Green – Violet – Silver
Ans: C
75. A positive charged particle with uniform velocity enters in a uniform magnetic field at a certain angle (0 < θ < 90º). The path of the particle in the field would be
(a) circular (b) parabolic (c) straight line (d) helical
Ans: D
76. Domains are formed in
(a) diamagnetic materials (b) paramagnetic materials (c) non-magnetic materials (d) ferromagnetic materials
Ans: D
77. The magnetic susceptibility is negative for
(a) diamagnetic materials (b) paramagnetic materials (c) ferromagnetic materials (d) para and ferromagnetic materials
Ans: A
78. A magnetic field cannot
(a) exert a force on a charged particle (b) change the velocity of charged particle
(c) change the momentum of a charged particle (d) change the kinetic energy of a charged particle
Ans: D
79. The temperature above which a ferromagnetic substance becomes a paramagnetic is called
(a) Curie temperature (b) Boyle’s temperature
(c) Debye’s temperature (d) Critical temperature
Ans: A
80. In a series LCR alternating current circuit, potential difference on each component is 50 V. Potential difference across LC terminal is (a) 0 V (b) 50 V (c) 50 √2 V (d) 100 V
Ans: A
81. Which of the following laws can be used to explain the induced electric currents ?
(a) Gauss’ law (b) Faradays’ Law (c) Ohm’s Law (d) Ampere’s Law
Ans: B
82. A transformer works on the principle of
(a) Self induction (b) Mutual induction (c) Generator (d) Inverter
Ans: B
83. The self inductance of a straight conductor is
(a) zero (b) very large (c) very small (d) infinite
Ans: A
84. For high frequency a capacitor offers
(a) more reactance (b) less reactance
(c) zero reactance (d) infinite reactance
Ans: B
85. Kinetic energy of a particle is increased by 300%. Percentage increase in momentum of particle is
(a) 300% (b) 200% (c) 100 √3% (d) 100%
Ans: D
86. Which of the following is a non-conservative force ?
(a) Electric force
(b) Gravitational force
(c) Spring force (d) Viscous force
Ans: D
87. A spring is compressed by 1 cm by a force of 4 newton. Find the potential energy of the spring, when it is compressed by 10 cm.
(a) 2.0 joule (b) 0.2 joule (c) 20 joule (d) 200 joule
Ans: A
88. Kepler’s second law is a consequence of
(a) Conservation of kinetic energy (b) Conservation of Linear momentum
(c) Conservation of angular momentum (d) Conservation of charge
Ans: C
89. An artificial satellite is moving in a circular orbit around the earth. Its speed is equal to half the magnitude of escape velocity from the earth. Height of the satellite above the surface of earth is (Given R as the radius of the earth)
(a) R/2 (b) R (c) 2R (d) 3R
Ans: B
90. A satellite has kinetic energy K, potential energy V and total energy E. Which of the following statement is true ?
(a) K = –1/2 V (b) K = 1/2 V
(c) E = 1/2 K (d) E = –1/2 K
Ans: A
91. The thrust of a rocket is
(a) a gravitational force acting on the rocket.
(b) the force of the existing fuel gases on the rocket.
(c) any force that is external to the rocket-fuel system.
(d) a force that arises from the reduction in mass of rocket-fuel system.
Ans: B
92. The electromagnetic radiations are in decreasing order of frequencies in following sequence :
(a) infrared waves, radio waves, X-rays, visible light
(b) radio wave, infrared waves, X-rays, visible light
(c) radio waves, visible light, infrared waves, X-rays
(d) X-rays, visible light, infrared waves, radio waves
Ans: D
93. Angle of minimum deviation measured with a prism is 30° and the angle of prism is 60°. The refractive index of prism material is
(a) 2/√3
(b) √2
(c) 1.5
(d) 1.64
Ans: B
94. The focal length of convex lens is 2.5 cm. Its magnifying power for minimum distance of distinct vision will be
(a) 1.1 (b) 11 (c) 40 (d) 4.1
Ans: B
95. In Young’s experiment, light of wavelength 6000 ÅU is used to produce fringes of width 0.8 mm at a distance of 2.5 m. If the whole apparatus is dipped in a liquid of refractive index 1.6, then the fringe width will be
(a) 0.5 mm (b) 0.6 mm (c) 0.8 mm (d) 1.28 mm
Ans: A
96. Which of the following colours of visible light has the longest wavelength ?
(a) Violet (b) Green (c) Yellow (d) Red
Ans: D
97. The Michelson interferometer was designed to study the nature of
(a) matter waves (b) sound waves (c) an “ether” (d) Sunlight
Ans: C
98. When white light is passed through a double slit, which of the following statement becomes true ?
(a) Each of bright bands is dispersed into a spectrum.
(b) Only the central band is dispersed into a spectrum.
(c) All the bright bands except the central one are dispersed into a spectrum.
(d) Each band has a single colour different from its neighbouring bands.
Ans: C
99. Which of the following phenomena suggest that light may be a transverse wave ?
(a) Reflection (b) Polarization (c) Photoelectric effect (d) Diffraction
Ans: B
100. The four natural laws of electromagnetic theory are called
(a) Einstein’s equations (b) Maxwell’s equations (c) Newton’s equations (d) Faraday’s laws
Ans: B
t = 3 s respectively. Maximum height attained by it is _______. (g = 10 m/s2)
(a) 5 m (b) 10 m (c) 15 m (d) 20 m
Ans: D
67. The SI standard of time is based on
(a) the daily rotation of the earth
(b) the yearly revolution of earth about the sun
(c) a precision pendulum clock
(d) None of these
Ans: D
68. While walking on ice, one should take small steps to avoid slipping. This is because smaller steps ensure
(a) larger friction (b) smaller friction (c) larger normal force (d) smaller normal force
Ans: B
69. The average force necessary to stop a hammer with 25 Ns momentum in 0.04 second is
(a) 625 N (b) 125 N (c) 50 N (d) 25 N
Ans: A
70. A dielectric slab is inserted between the plates of an isolated capacitor. The force between the plates will
(a) increase (b) decrease
(c) remains constant (d) become zero
Ans: C
71. As the temperature of a metallic wire is increased, the product of its resistivity and conductivity
(a) increases (b) decreases
(c) remains constant (d) may increase or decrease
Ans: C
72. For an infinite sheet of positive charge, the electric field lines
(a) run parallel to the sheet of charge.
(b) are perpendicular to the sheet of charge and point in towards the sheet.
(c) are perpendicular to the sheet of charge and point away from the sheet.
(d) fall off as 1/r2
Ans: B
73. While applying Kirchhoff’s law to electronic circuit, assumed direction of current flow must be
(a) clockwise (b) anticlockwise
(c) from left to right (d) either (a) or (b)
Ans: D
74. A carbon resistor (47 ± 4.7) kΩ is to be marked with rings of different colours for its identification. The colour code sequence will be (a) Green – Orange – Violet – Gold
(b) Violet – Yellow – Orange – Gold
(c) Yellow – Violet – Orange – Silver
(d) Yellow – Green – Violet – Silver
Ans: C
75. A positive charged particle with uniform velocity enters in a uniform magnetic field at a certain angle (0 < θ < 90º). The path of the particle in the field would be
(a) circular (b) parabolic (c) straight line (d) helical
Ans: D
76. Domains are formed in
(a) diamagnetic materials (b) paramagnetic materials (c) non-magnetic materials (d) ferromagnetic materials
Ans: D
77. The magnetic susceptibility is negative for
(a) diamagnetic materials (b) paramagnetic materials (c) ferromagnetic materials (d) para and ferromagnetic materials
Ans: A
78. A magnetic field cannot
(a) exert a force on a charged particle (b) change the velocity of charged particle
(c) change the momentum of a charged particle (d) change the kinetic energy of a charged particle
Ans: D
79. The temperature above which a ferromagnetic substance becomes a paramagnetic is called
(a) Curie temperature (b) Boyle’s temperature
(c) Debye’s temperature (d) Critical temperature
Ans: A
80. In a series LCR alternating current circuit, potential difference on each component is 50 V. Potential difference across LC terminal is (a) 0 V (b) 50 V (c) 50 √2 V (d) 100 V
Ans: A
81. Which of the following laws can be used to explain the induced electric currents ?
(a) Gauss’ law (b) Faradays’ Law (c) Ohm’s Law (d) Ampere’s Law
Ans: B
82. A transformer works on the principle of
(a) Self induction (b) Mutual induction (c) Generator (d) Inverter
Ans: B
83. The self inductance of a straight conductor is
(a) zero (b) very large (c) very small (d) infinite
Ans: A
84. For high frequency a capacitor offers
(a) more reactance (b) less reactance
(c) zero reactance (d) infinite reactance
Ans: B
85. Kinetic energy of a particle is increased by 300%. Percentage increase in momentum of particle is
(a) 300% (b) 200% (c) 100 √3% (d) 100%
Ans: D
86. Which of the following is a non-conservative force ?
(a) Electric force
(b) Gravitational force
(c) Spring force (d) Viscous force
Ans: D
87. A spring is compressed by 1 cm by a force of 4 newton. Find the potential energy of the spring, when it is compressed by 10 cm.
(a) 2.0 joule (b) 0.2 joule (c) 20 joule (d) 200 joule
Ans: A
88. Kepler’s second law is a consequence of
(a) Conservation of kinetic energy (b) Conservation of Linear momentum
(c) Conservation of angular momentum (d) Conservation of charge
Ans: C
89. An artificial satellite is moving in a circular orbit around the earth. Its speed is equal to half the magnitude of escape velocity from the earth. Height of the satellite above the surface of earth is (Given R as the radius of the earth)
(a) R/2 (b) R (c) 2R (d) 3R
Ans: B
90. A satellite has kinetic energy K, potential energy V and total energy E. Which of the following statement is true ?
(a) K = –1/2 V (b) K = 1/2 V
(c) E = 1/2 K (d) E = –1/2 K
Ans: A
91. The thrust of a rocket is
(a) a gravitational force acting on the rocket.
(b) the force of the existing fuel gases on the rocket.
(c) any force that is external to the rocket-fuel system.
(d) a force that arises from the reduction in mass of rocket-fuel system.
Ans: B
92. The electromagnetic radiations are in decreasing order of frequencies in following sequence :
(a) infrared waves, radio waves, X-rays, visible light
(b) radio wave, infrared waves, X-rays, visible light
(c) radio waves, visible light, infrared waves, X-rays
(d) X-rays, visible light, infrared waves, radio waves
Ans: D
93. Angle of minimum deviation measured with a prism is 30° and the angle of prism is 60°. The refractive index of prism material is
(a) 2/√3
(b) √2
(c) 1.5
(d) 1.64
Ans: B
94. The focal length of convex lens is 2.5 cm. Its magnifying power for minimum distance of distinct vision will be
(a) 1.1 (b) 11 (c) 40 (d) 4.1
Ans: B
95. In Young’s experiment, light of wavelength 6000 ÅU is used to produce fringes of width 0.8 mm at a distance of 2.5 m. If the whole apparatus is dipped in a liquid of refractive index 1.6, then the fringe width will be
(a) 0.5 mm (b) 0.6 mm (c) 0.8 mm (d) 1.28 mm
Ans: A
96. Which of the following colours of visible light has the longest wavelength ?
(a) Violet (b) Green (c) Yellow (d) Red
Ans: D
97. The Michelson interferometer was designed to study the nature of
(a) matter waves (b) sound waves (c) an “ether” (d) Sunlight
Ans: C
98. When white light is passed through a double slit, which of the following statement becomes true ?
(a) Each of bright bands is dispersed into a spectrum.
(b) Only the central band is dispersed into a spectrum.
(c) All the bright bands except the central one are dispersed into a spectrum.
(d) Each band has a single colour different from its neighbouring bands.
Ans: C
99. Which of the following phenomena suggest that light may be a transverse wave ?
(a) Reflection (b) Polarization (c) Photoelectric effect (d) Diffraction
Ans: B
100. The four natural laws of electromagnetic theory are called
(a) Einstein’s equations (b) Maxwell’s equations (c) Newton’s equations (d) Faraday’s laws
Ans: B