Quiznetik

A Level Physics | Set 6

1. Least count of screw gauge is

Correct : D. 0.01 mm

2. Increase in kinetic energy of car having mass 800 kg and velocities ranging from 20 m s -1 to 30 m s -1 is {{}}

Correct : D. 200 KJ

3. Work done by a person having weight 600 N and he needs to climb up a mountain of height 2000 m is

Correct : D. 1200 kJ

4. Internal resistance of cell when there is current of 0.40 A when a battery of 6.0 V is connected to a resistor of 13.5 Ω is

Correct : A. 1.5 Ω

5. Barrel of screw gauge has

Correct : B. 50 divisions

6. A measurement which on repetition gives same or nearly same result is called

Correct : C. precise measurement

7. A motor of the lift provides a force of 20 kN which rises it by 18 m in 10 s, the output power of motor is

Correct : A. 36 kW

8. Actual range of values around a measurement is called

Correct : B. uncertainty

9. Depth of water in a bottle is 24.3 cm and uncertainty is 0.2 cm, percentage uncertainty in measurement is

Correct : A. 0.82%

10. While taking the reading, the line of sight should be

Correct : B. perpendicular to scale

11. Maximum current a battery of e.m.f 3.0 V and internal resistance 1.0 Ω is

Correct : C. 3.0 A

12. In potential dividers, the output voltage depends upon the

Correct : B. relative values of all resistors

13. Calipers are used to measure the

Correct : A. diameter

14. Smallest division on stopwatch is

Correct : C. 0.01 s

15. intensity of sun's radiation is about {{}}

Correct : A. 1.0 kW m-2

16. When light enters from vacuum in to glass, it's velocity

Correct : A. decreases

17. As wave travels, intensity

Correct : C. decreases

18. Waves that move through materials are called

Correct : A. progressive waves

19. Speed of sound in air is {{}}

Correct : D. 330 m s-1

20. Particles vibrate about their mean positions and transfer

Correct : C. energy

21. Speed of electromagnetic radiation is independent of

Correct : D. frequency

22. Mechanical waves include

Correct : A. sound

23. A complete cycle of wave is around

Correct : D. 360°

24. Changing magnetic field induces

Correct : B. current

25. Phase difference is measured in

Correct : A. degrees

26. Speed at which stars and galaxies are moving away from us is determined by phenomena of

Correct : C. red shift

27. Electric and magnetic fields vary at angle of

Correct : B. 90°

28. Unification of electromagnetic and weak nuclear forces was done by

Correct : D. Abdus-Salam

29. Frequency and time period are

Correct : C. inversely related

30. Amount by which one oscillation leads or lags behind another is called

Correct : C. phase difference

31. Number of oscillations per unit time is called

Correct : D. frequency

32. If the particles of medium vibrate at right angles to the direction of velocity then wave is

Correct : B. transverse

33. Intensity of a wave is directly proportional to the

Correct : B. square of amplitude

34. Wave speed is directly proportional to

Correct : C. wavelength

35. Longitudinal waves gives rise to

Correct : D. high and low pressure regions

36. Ranges of waves which overlap are

Correct : A. x-rays and gamma rays

37. In order to find the internal structure of nucleus, electrons should be accelerated by voltages up to

Correct : C. 109 V

38. High speed electrons have wavelength of order

Correct : A. 10-15 m

39. Wavelength of slow moving neutrons is about

Correct : D. 10-10 m

40. High speed electrons from particle detectors are used to determine

Correct : B. diameter of atomic nuclei

41. Energy of gamma photon is greater than

Correct : B. 10-13 J

42. Waves associated with electrons are referred to as

Correct : D. matter waves

43. Frequency below which no electrons are emitted from metal surface is

Correct : D. threshold frequency

44. Loss of energy of an electron results in

Correct : B. emission of photon

45. Wavelength of a 65 kg person running at a speed of 3 m s -1 through an opening of width 0.80 m is {{}}

Correct : C. 3.4 × 10-36 m

46. According to Newton, the light travels as

Correct : A. particles

47. In electron diffraction, the rings behave as

Correct : B. waves

48. Energy absorbed by electron is used in

Correct : C. both A and B

49. Diffraction of slow moving electrons is used to estimate

Correct : A. arrangement of atoms in metals

50. Energy of photon is directly related to the

Correct : C. frequency

51. When a charged particle is accelerated through a potential difference V, it's kinetic energy

Correct : C. increases

52. Energy of an electron in an atom is

Correct : A. quantized

53. In dark, LDR has

Correct : C. high resistance

54. 1 eV is equal to {{}}

Correct : A. 1.6 × 10 -19 J

55. Electrons show diffraction effects because their de Broglie wavelength is similar to

Correct : A. spacing between atomic layers

56. Characteristic properties of waves are

Correct : D. all of above

57. Plank's constant has units {{}}

Correct : D. J s

58. Gas atoms that exert negligible electrical forces on each other are

Correct : D. isolated atoms

59. Wavelength of red color is about {{}}

Correct : A. 7 × 10-7 m

60. Quantum of electromagnetic energy is called

Correct : B. photons

61. In photoelectric effect, electrons should be removed from the

Correct : B. surface

62. Light interacts with matter as

Correct : B. particle

63. When white light is passed through cool gases, the spectra observed is called

Correct : D. absorption line spectra

64. Wavelength of ultraviolet region of electromagnetic spectrum is

Correct : A. 121 nm

65. In an insulator, the valence band is

Correct : A. fully occupied

66. Most energetic photons are

Correct : C. gamma

67. Radius of nucleus ranges from {{}}

Correct : B. 10-15 m to 10-14 m

68. Number of protons in an atom determine

Correct : A. chemical properties

69. In β+ decay, an UP quark becomes

Correct : C. a down quark

70. Most of the space in an atom is

Correct : B. empty

71. A proton is made up of

Correct : C. two up quarks and a down quark

72. Neutrinos have electric charge of

Correct : A. zero

73. β-radiations are simply {{}}

Correct : C. electrons

74. In a nuclear process, the quantity conserved is

Correct : A. mass-energy

75. A specific combination of protons and neutrons in a nucleus is called

Correct : B. nuclide

76. In β + decay, the nucleon number is

Correct : A. conserved

77. Particles that are un affected by strong nuclear force are

Correct : B. leptons

78. Number of isotopes neon has is

Correct : C. 3

79. Phenomena of radioactivity was discovered by Henri Becquerel in

Correct : A. 1896

80. Radiations emitted by radioactive substances is

Correct : D. all of above

81. Elements undergo radioactive decay when proton number becomes greater than

Correct : C. 83

82. Process in which α and β rays pass close to atoms and knock electrons out is called

Correct : B. ionization

83. Alpha particles have relatively

Correct : D. high kinetic energy

84. Strongest ionizing radiation is

Correct : A. Alpha

85. The nucleon number consists of

Correct : D. Number of protons and neutrons

86. Gamma radiation is emitted in order to

Correct : B. release excess energy from atom

87. Electrons move around nucleus in form of

Correct : A. clouds

88. Particles like kaons and muons etc, were found out by

Correct : D. both A and B

89. Type of rays that affect the nucleus are

Correct : A. alpha

90. Force that acts on both quarks and leptons is

Correct : B. weak interaction

91. Particles that experience strong force are

Correct : B. hadrons

92. Heavy nuclei have

Correct : D. more neutrons than protons

93. The strong nuclear force acts over the distance

Correct : B. 10-14 m

94. A decay in which a proton decays in to neutron and an electron neutrino is

Correct : B. β-

95. Photon of electromagnetic radiation is

Correct : C. γ ray

96. Mass of alpha particle is

Correct : D. 1000 times the mass of electron

97. Particle which explains about mass of matter is called

Correct : A. Higgs boson

98. Plum pudding model describes atom as

Correct : C. positive pudding with negative plums

99. Lepton among them are

Correct : D. both A and B

100. Density of proton is equal to density of

Correct : C. neutron