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PPSC Lecturer Physics (BS-17) Fully Solved

 

 

1. The physics underlying the operation of the refrigerator most closely resemble the physics underlying :





ANSWER= (A) A heat engine

 

2. The law that governs the force between electric charges bears the name of :





ANSWER= (B) Columb

 

3. The electric volt is the unit of:





ANSWER= (C) energy

 

4. A certain wire has a resistance R. The resistance of another wire identical with the first except for having twice its diameter is:





ANSWER= (A) 1/4R

 

5. The separation between the plates of a parallel plate capacitor whose original capacitance was C is doubled. The capacitance is now:





ANSWER= (C) 2C

 

6. The time required to charge a capacitor depends upon:





ANSWER= (D) the product of its capacitance and its resistance in the circuit

 

7. A current is flowing north along a power line. The direction of the magnetic field above it, neglecting the earth's field, is:





ANSWER= (D) west

 

8. When a dia magnetic substance is inserted into the current carrying coil, the magnetic field:





ANSWER= (D)first increase then decrease

 

9. The time required for the charged particle to make a complete revolution in a magnetic field does not depend upon :





ANSWER= (A) its mass

 

10. The fact that an electric field is produced in a conductor whenever magnetic lines of force move across it is referred to as:





ANSWER= (C) Faraday's law

 

11. Lenz's law is the consequence of the law of conservation of:





ANSWER= (D) energy

 

12. A dynamic is often set to generate electricity. It actually acts as a source of:





ANSWER= (D) magnetism

 

13. The time required for a current to be established in a circuit depends upon:





ANSWER= (B) its inductance and its resistance

 

14. Which of the following is not electromagnetic in nature?:





ANSWER= (D) sound waves

 

15. Beats are the result of:





ANSWER= (D) constructive and destructive interference

 

16. Longitudinal waves do not exhibit:





ANSWER= (C) polarization

 

17. A crucial experiment thatled to the theory of relativity was performed by:





ANSWER= (B) Albert Einstein

 

18. An observer moves past a stationery electron on the earth's surface. His instruments measure:





ANSWER= (B) only a magnetic field

 

19. Relative to the original photon, the photon that emergesfrom a collision with an electron as:





ANSWER= (C) higher frequency

 

20. Modern physical theories indicate that:





ANSWER= (A)all particle exhibit wave behaviour

 

21. The total energy of an atomic electron is:





ANSWER= (A) less than zero

 

22. A hydrogen atom is in its ground state when its orbital electron:





ANSWER= (C) is in its lowest energy level

 

23. The energy of the quantum states is primarily dependent upon the quantum number:





ANSWER= (A) n

 

24. The two electrons in a helium atom:





ANSWER= (C) have opposite spins

 

25. There are no expected linesabsent from the spectra of:





ANSWER= (A) hydrogen

 

26. A molecule has charge distribution is not perfectly symmetrical is called:





ANSWER= (A) a polar molecule

 

27. A vacuum tube will conduct only if its plate is ______________ with respect to the cathode.:





ANSWER= (A) positive

 

28. Which tube generates the greatest noise? :





ANSWER= (B) pentode

 

29. A vacuum diode acts as a ____________ switch.:





ANSWER= (B) unidirectional

 

30. With rise of temperature, the angle of contact of liquid:





ANSWER= (B) decrease

 

31. Valves in a radio receiver generally employ _________ heated cathodes:





ANSWER= (B) indirectly

 

32. Which valve has the lowest amplification factor :





ANSWER= (A) triode

 

33. A pentode is a.................. device. :





ANSWER= (A) constant current

 

34. The indirectly heated cathode of the diode is coated with:





ANSWER= (C) barium oxide

 

35. What started conduction in thecold cathode tube? :





ANSWER= (A) natural sources

 

36. What is the solid state equivalent of cold cathode tube? :





ANSWER= (A) zener diode

 

37. One fermi is equal to:





ANSWER= (A) 1.0E-5 A

 

38. What is full form of LED:





ANSWER= (B) Light Emitting Diode

 

39. A grid controlled vacuum tube act as:





ANSWER= (A) an amplifier

 

40. The filament voltage is a direct measure of:





ANSWER= (B) filament temperature

 

41. The following is an intensive coordinate of the thermodynamic system in equilibrium state? :





ANSWER= (B) pressure

 

42. The type of work which cannot be described in macroscopic thermodynamics:





ANSWER= (C) internal work

 

43. All natural process are:





ANSWER= (B) irreversible

 

44. For a reversible adiabatic process:





ANSWER= (A) dS=0

 

45. Neutrions are emitted in the following decay:





ANSWER= (B) beta decay

 

46. For the structure of nucleus, the number 28 is:





ANSWER= (A) magic number

 

47. Positron was discovered by:





ANSWER= (A) Anderson

 

48. Zener diode is used for:





ANSWER= (B) stablization

 

49. Nuclear force is a:





ANSWER= (A) repulsive and short range

 

50. Defect of colour blindness can be cured by the using a:





ANSWER= (A) contact lens

 

51. The heaviest Class of elementry particles consists of the?:





ANSWER= (D) Baryons

 

52. The quantum number which is not involved in describing the orbit of an atomic electron is:





ANSWER= (C) S

 

53. The ionization energy of an atom relative to biding energy of its nucleus is:





ANSWER= (D) Sometime greater & Sometime smaller

 

54. If two systems "A" & "B" are in thermal equilibreum with a system "c" ,then....... are not in equilibreum:





ANSWER= (C) B & C

 

55. The following is an intensive coordinate of a thermodynamics system in equilibreum state:





ANSWER= (B) Pressure

 

56. The type of work which cannot be described in microscopic thermodynamics:





ANSWER= (B) Internal Work

 

57. In thermodynamics, Workdone by the system is taken as:





ANSWER= (A) Positive

 

58. The SI unit of Specific heat capacity is:





ANSWER= (A) J/Kg-k

 

59. All natural processes are:





ANSWER= (B) Irreversible

 

60. When a horse pulls a wagon,the force that causes the horse to move forward is the force:





ANSWER= (D) The ground exerts on him

 

61. The minimum number of unequal forces whose vector sum can equal Zero is:





ANSWER= (C) 3

 

62. A force of 3n acts perpendicularly to a force 4n,there resultant has a magnitude of :





ANSWER= (A) 1n

 

63. A body in equilibreum may not have:





ANSWER= (B) Accelration

 

64. In Order to cause a moving body to pursue a circular path,it is necessary to apply:





ANSWER= (D) Centripetal Force

 

65. A hole is drilled through the earth along a diameter & a stone dropped into it,when stone is at the center of earth it has?:





ANSWER= (A) Mass

 

66. The rotational analog of force in linear motion is:





ANSWER= (C) Torque

 

67. According to Hook's Law the force needed to applied on elastic body by an amount "s" is prportional to:





ANSWER= (A) s

 

68. A sharing stress that acts on a body affects its:





ANSWER= (D) Shape

 

69. In S.H.M, there is always a constant ratio between the displacement of mass and its:





ANSWER= (B) Mass

 

70. Waves transmit from one place to another:





ANSWER= (A) Energy

 

71. Of the following properties of a wave,the one that is independent of the other is its?:





ANSWER= (B) Velocity

 

72. When a sound wave goes from air into water, the quantity that remains unchanged is its:





ANSWER= (C) Frequency

 

73. Two blocks of lead,one twice as heavy as the other , are both at 50 degree centigrade.The ratio of heat constant of heavier block to that of the lighter block is:





ANSWER= (D) None

 

74. "Heat" is closely related to:





ANSWER= (B) Temprature

 

75. Sublimation refers to:





ANSWER= (A) The vaporization of solid without first becoming a liquid

 

76. Under Conditions correspondings to its triple point,a substance:





ANSWER= (D) may be in any or all of the above states

 

77. The ratio between the energy dissipated in some process & heat that appears as a result is the:





ANSWER= (D) Mehanical equalent of heat

 

78. The smallest sub division of a compound that exhibit its characteristics properties is called:





ANSWER= (D) An element

 

79. The energy of the molecular motion appears in the form of:





ANSWER= (C) Temprature

 

80. The ionization energy of an atom relative to the binding energy of its nucleus:





ANSWER= (C) Smaller

 

81. Yukawa's theory suggest that nuclear forces arives through the exchange of:





ANSWER= (D) Masons

 

82. The tunnel affect makes possible:





ANSWER= (A) Alpha decay

 

83. The first phase of nuclear reaction involves the formation of:





ANSWER= (B) A compound nucleus

 

84. Of the following elementry particles,the one that never decays in free space is the:





ANSWER= (D) Neutrons

 

85. Unstable elementry particles heavier than the proton are called:





ANSWER= (B) K-mesons

 

86. A quantity not always conserve in the decay of elementary particles is:





ANSWER= (B) Lepton number

 

87. On molding grid potential excesively negative plate resistance is ?:





ANSWER= (A) Become Zero

 

88. What are the two principle electrodes in every tube?:





ANSWER= (C) Plate & cathode

 

89. In a vacuume diode can be used as:





ANSWER= (C) A rectifier

 

90. The temperature Co-efficient of resistance of a semi conductor is:





ANSWER= (C) Negative

 

91. For rectifying action we use:





ANSWER= (A) Diode

 

92. A.C plate resistance of a diode valve at saturation is:





ANSWER= (B) Infinite

 

93. Which is not the basic operation of Boolean Variables:





ANSWER= (A) YES Operation

 

94. A forward biased p-n junction practically offers?:





ANSWER= (D) Both B&C

 

95. A solid state detector basically:





ANSWER= (C) Both

 

96. The ratio of the inertial mass to the gravitational mass is :





ANSWER= (B) 1

 

97: Mean free path of the moleculas of a gas depends on the pressure 'P' as





ANSWER= (B) 〖p-〗^2

 

98.The mass of neutrino is:





ANSWER= (A) Zero

 

99.Unstable elementary particles heavier than the proton are called:





ANSWER= (A) Leptons

 

100.Electromagnetic waves transport:





ANSWER= (D) Energy

 

 

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