UKPSC Lecturer 2018: Uttarakhand Special Subordinate Education (Lecturer-Group 'C') Services General/Women Branch Exam, 2nd Phase (Physics)
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1. A transformer works on the principle of
(a) Self induction (b) Mutual induction
(c) Generator (d) Inverter
2. The self inductance of a straight conductor is
(a) zero (b) very large (c) very small (d) infinite
3. For high frequency a capacitor offers
(a) more reactance (b) less reactance
(c) zero reactance (d) infinite reactance
4. Kinetic energy of a particle is increased by 300%. Percentage increase in momentum of
particle is
(a) 300% (b) 200% (c) 100 % (d) 100%
5. Which of the following is a non-conservative force?
(a) Electric force (b) Gravitational force
(c) Spring force (d) Viscous force
6. 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) 200jou1e
7. 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
8. 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
9. A satellite has kinetic energy K, potential energy V and total energy E. Which of the
following statement is true?
(a) K—V (b) K= 1V (c) E= 1K (d) E=—K
10. 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.
11. The energy of Electromagnetic wave in vacuum is given by
E2 B2 1 1
(a) (b) -€0 E2 + -
2€ 2i.to 2 2
E2 + B2 (d) €gj E2 +
(c)
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12. The direction of propagation of electromagnetic wave is given by
-* -* -* - -
(a) E B (b) E (c) B (d) E x B
13. 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
14. Angle of minimum deviation measured with a prism is 30° and the angle of prism is 600.
The refractive index of prism material is
(a) (b) (c) 1.5 (d) 1.64
15. 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
16. When the angle of incidence on a material is 60°, the reflected light is completely plane
polarised. The velocity of the refracted light inside the material in mis is
(a) 3 x 108 (b) ..J x 108 (c) x 108 (d) x 108
17. In Young's experiment, light of wavelength 6000 Au is used to produce fringes of width
0.8 nun 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) 0.5mm (b) 0.6mm (c) 0.8mm (d) 1.28mm
18. Which of the following colours of visible light has the longest wavelength?
(a) Violet (b) Green (c) Yellow (d) Red
19. The Michelson interferometer was designed to study the nature of
(a) matter waves (b) sound waves (c) an "ether" (d) Sunlight
20. 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.
21. Which of the following phenomena suggest that light may be a transverse wave?
(a) Reflection (b) Polarization
(c) Photoelectric effect (d) Diffraction
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22. 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
23. The inverse of wavelength is referred as
(a) wave number (b) wavelength itself
(c) frequency (d) momentum
24. Which of the following scientific instrument has the greatest resolving power?
(a) Electron microscope
(b) Light microscope
(c) Telescope
(d) Phase-contrast microscope
25. The de-Broglie wavelength of an electron having 80 eV energy is
(a) 140 Au (b) 0.14 Au (c) 1.4 Au (d) 14 Au
26. In dispersive medium the relation between group velocity 'vg' and phase velocity 'VP' is
(a) Vg > v (b) vg VP (c) vg < VP (d) None of these
27. If two operators A and B follow commutation with their commutator [A, B], then the value
of [A, B] is equal to
(a) nB [A, B] (b) nB - 1 [A, B] (c) nB [A, B] (d) n [A, B]
1 1
28. IfIa>= 2 and I 1 > = 1 ,then<131a>is
3
(a) 2+2i (b) 2-2i (c) 2 + 4i (d) None of these
29. Which of the following operator denotes the energy operator?
(a) ih— (b) -1 h— (c) 1h— (d) —'
& at
30. The probability of fmding one dimensional quantum simple harmonic oscillator within the
classical limits, when the oscillator is in ground state is —
(a) 50% (b) 67% (c) 84% (d) 100%
31. The ratio of minimum wavelength of Lyman and Balmer series will be
(a) 1.25 (b) 0.25 (c) 5 (d) 10
32. The energy of an electron in the lIth orbit of hydrogen atom is expressed as E — eV.
The shortest and longest wavelength of Lyman series will be near about
(a) 910Au,1213AU (b) 1315Au,l53oAu
(c) 5463 Au, 7858 Au (d) None of these
Series-B 6 ICL-09
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33. In which region of electromagnetic spectrum does the Lyman series of hydrogen atom
lies?
(a) X-ray (b) infrared (c) Visible (d) Ultraviolet
34. The Milikan experiment showed that the electric charge was
(a) negative (b) positive (c) quantized (d) unmeasurable
35. An X-ray photon collides with a free electron and the photon is scattered. During this
collision there is conservation of
(a) momentum but not energy (b) neither momentum nor energy
(c) energy but not momentum (d) both momentum and energy
36. The half life of an isotope of an element is 5 days. The mass of a 10 gm sample of this
isotope remaining after 20 days is
(a) 0.3 12 gms (b) 0.625 gms (c) 1.25 gms (d) 2.50 gms
37. Alpha particle are nuclei of
(a) hydrogen (b) helium (c) oxygen (d) nitrogen
38. The intrinsic semi-conductor has
(a) a finite resistance which does not change with temperature.
(b) infinite resistance which decreases with temperature.
(c) finite resistance which decreases with temperature.
(d) infinite resistance which does not change with temperature.
39. Reverse bias applied on a junction diode
(a) raises the potential barrier
(b) increases majority charge carrier current
(c) lowers the potential barrier
(d) increases the temperature ofj unction
40. Which of the following is universal gate?
(a) NOT (b) AND (c) NAND (d) OR
41. Light emitting diode
(a) is always forward biased. (b) is always reverse biased.
(c) may be forward or reverse biased. (d) requires no biasing.
42. In n—p—n transistor
(a) holes move from emitter to base
(b) electrons move from emitter to base
(c) holes move from base to collector
(d) electrons move from collector to base
43. Which of the following is not a component of communication system?
(a) Transistor (b) Transmission channel
(c) Noise (d) Receiver
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44. Refractive index of ionosphere is
(a) one (b) more than one (c) less than one (d) zero
45. What is the working principle of an optical fibre?
(a) Refraction (b) Total internal reflection
(c) Dispersion (d) Scattering
46. Atomic spectra is an example of
(a) Line spectra (b) Continuous spectra
(c) Band spectra (d) Both (a) and (b)
47. The fme structure constant has a value near about
(a) -- (b) (c) (d)
11 111 137 127
48. Allowed transitions obey the
(a) Hund's rule (b) Selection rule Al = ± I
(c) Spin resonance rule, A/ + 1 (d) None of these
49. The decimal number for octal 74 is
(a) 22 (b) 32 (c) 60 (d) 74
50. When a metal becomes a super-conductor, there is tremendous decrease in
(a) total volume (b) electrical resistance
(c) length (d) density
51. In the Sun, the helium is produced from hydrogen by
(a) radioactive decay (b) disintegration
(c) fission (d) fusion
52. One of the following is a device that detects charged particles but does not show their
tracks. Which is that device?
(a) Spark chamber (b) Photographic plate
(c) Scintillation counter (d) Bubble chamber
53. The neutron in an atom
(a) are part of nuclear charge.
(l) rotate about the nucleus in circular orbits.
(c) vary in number with different isotopes.
(d) are always equal in number to the total number of protons.
54. When an atom undergoes beta decay, the atomic number of nucleus
(a) is increased. (b) increases by one.
(c) decreases by one. (d) Noiie of these
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55. One atomic mass unit (amu) is equal to
(a) 1.66x10 20 gm (b) 1.66x10 22 gm
(c) 1.66x10 24 gm (d) 1.66 x 10-26 gm
56. Rest mass energy of an electron is
(a) 1.02 MeV (b) 0.511 MeV (c) 0.511 KeV (d) 0.511 GeV
57. A superconducting material when placed in a magnetic field will
(a) attract the magnetic field towards its centre.
(b) repel all the magnetic lines of forces passing through it.
(c) attract the magnetic field but transfer it into concentrated zone.
(d) not influenced by the magnetic field.
58. X-rays are used to detect the internal structure of crystal because
(a) X-rays are not harmful.
(b) Wavelength of X-rays matches with inter-planner distance of crystal.
(c) Bragg condition is satisfied with X-rays only.
(d) None of these
59. Which of the following reactions is forbidden by Baryon number conservation?
(a) k-*it°+e+y (b) A° —>7t+p
(c) k —*1c+A° (d) 1t+p-+A°+k°
60. Which of the following defmitions of reciprocal lattice is correct?
-3 -3 -3 -3
-) bxc -+ cxa
(a) A=2it, -4
(b) B=27t -3
a (b x c) a (bx c)
-3 -3
axb
(c) C=2it (d) All of these
a (b x c)
61. An anti-proton is an atomic particle that has
(a) the mass of proton and charge of an electron.
(b) the mass of an electron and charge of a proton.
(c) the mass of a neutron and charge of a proton.
(d) the mass of a proton and charge of a neutron.
62. Which of the following conservation laws have broken symmetry?
(a) Lepton number (b) Baryon number
(c) Charge number (d) Strangeners
63. The charge of a particle which is made up of three quarks dds is
(a) +e (b) + e (c) -e
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64. Stokes' theorem relates
(a) Surface integral of curl of a vector field with the divergence of that field.
(b) Surface integral of curl of a vector field with the line integral of that field.
(c) Line integral of curl of a vector field to divergence of a vector field.
(d) Divergence of a vector field to the curl of that field.
65. The Eigen values of Hermitian matrix are always
(a) positive (b) negative (c) real (d) complex
"1 —3 3'
66. The Eigen values of matrix A = 3 —5 3 are
—6 4
(a) 4,2 (b) 4,-2 (c) 4,4 (d) 2,4
67. Diadic tensor has rank
(a) 0 (b) (c) 2 (d) 3
68. Canonical co-ordinate transformation (q, p, t) -~ (Q, P, t) preserves the form of
(a) Lagrangian equation of energy (b) Hamilton's equations
(c) Schrodinger's equation (d) Kepler's laws
69. The first law of thermodynamics is a statement of
(a) Conservation of heat (b) Conservation of angular momentum
(c) Conservation of linear momentum (d) Conservation of energy
70. Root mean square (r.m.s.) velocity of a gas molecules of mass 'm' at given temperature is
proportional to
1
(a) m2 (b) m (c) (d)
71. The specific heat of a gas in isothermal process is
(a) zero (b) negative (c) remain constant (d) infmite
72. Which of the following are not made up of quarks?
(a) Mesons (b) Baryons (c) Laptons (d) Hadrons
73. Interference occurs due to of light.
(a) Particle nature (b) Both particle and wave nature
(c) Wave nature (d) None of these
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74. Velocity-time graph for a particle moving in a straight line is as shown. The displacement
of the particle in first four second is
+
4
i Time(s)
—2
(a) 0 (b) 2 m (c) 4 m (d) 8 m
75. A projectile is shown with speed u making angle 0 with horizontal at t = 0. It just crosses
two points at two equal heights at t = 1 s and t s respectively. Maximum height attained
by it is . (g = 10 mIs2)
(a) 5 m (b) 10 m (c) 15 m (d) 20 m
- A A -4 A A
76. The angle between A = i + j and B i — j is
(a) 45° (b) 90° (c) —45° (d) 180°
77. 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
78. In given figure ratio of tensions T1 : T2 : T3 is -
(a) 1:1:1 (b) 2:3:5 (c) 2:5:10 (d) 5:3:2
79. 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
80. Seven blocks, each of 1 kg are arranged one above the other as shown in figure. What are
the values of the contact forces exerted on the third block by the fourth and second block
respectively? (g = 10 m/s2)
7
6
5
4
3
2
1
(a) 40N,50N (b) 50N,40N (c) 40N,20N (d) 50N,30N
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81. The average force necessary to stop a hammer with 25 Ns momentum in 0.04 second is
(a) 625N (b) 125N (c) 50N (d) 25N
82. 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
83. 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
84. Two infinitely long parallel wires having linear charge densities ? and 2s.2 respectively are
placed at a distance R metres. The force per unit length on either wire will be
I 2X1?2 2X1?2 ??
I ____ 1 I2
(a) b (c) (d)
4IEE0 R 4te0 R2 4tE0 R2 4itE0 R
85. For an infmite 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 poilit in towards the sheet.
(c) are perpendicular to the sheet of charge and point away from the sheet.
(d) fall off as
86. What is the potential difference between the terminals A and B?
3A
A_) W I •B
2 4V iv
2
(a) 12 V (b) 24 V (c) 36 V (d) 48 V
87. 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)
88. Potential difference across the plates of capacitor C in the steady state of given circuit is
E r
R
C
R R E _L B
(a) E (b) (c) (d) E
2R+r R+r 2R
89. Two balls carrying charges + 7 i.tC and —5 tC attract each other by a force F. If charge
—2 .tC is added to both, then the force between them will be
(a) F (b) F (c) .F (d) F
35 27 7
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90. A uniform silver wire has resistivity of 1.5 x 10-8 )-m at room temperature. For an
electric field along the wire of 1 volt/cm, average drift velocity of the electron, assuming
6 x 1028 conduction electrons/rn3 in wire is
(a) 7 mIs (b) 7 x 10-' mIs (c) 7 x 10-2 m/s (d) 7 x i0 rn/s
91. A carbon resistor (47 ± 4.7) k~ 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
- - - - - -
92. A body has a positive charge of 8 x 10-19 coulomb. It has
(a) an excess of 5 electrons (b) a deficiency of 5 electrons
(c) an excess of 8 electrons (d) a deficiency of 8 electrons
93. A closed surface has n electric dipoles located inside it. The net electric flux emerging
through the surface is
(a) ne/E0 (b) 2e/E 0 (c) 2nel€ 0 (d) 0
94. A positive charged particle with uniform velocity enters in a uniform magnetic field at a
certain angle (0 <0 <900). The path of the particle in the field would be
(a) circular (b) parabolic (c) straight line (d) helical
95. Domains are formed in
(a) diamagnetic materials (b) paramagnetic materials
(c) non-magnetic materials (d) ferromagnetic materials
96. The magnetic susceptibility is negative for
(a) diamagnetic materials (b) paramagnetic materials
(c) ferromagnetic materials (d) para and ferromagnetic materials
97. 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
98. 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
99. In a series LCR alternating current circuit, potential difference on each component is 50 V.
Potential difference across LC terminal is
(a) OV (b) 50V (c) so-J V (d) bOy
100. 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
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Space For Rough Work I 1W W1 Series-B 22 ICL-09
Official key not published for this paper.
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Source: Uttarakhand Public Service Commission. Question paper published by Uttarakhand Public Service Commission.