1. Isotopes have same:
A. Chemical properties
B. Physical properties
C. Both of these
D. Non of these
2. Which of following element has maximum number of isotopes
A. Xenon
B. Cesium
C. .Nitrogen
D. Both A & B
4. Which of following statement is wrong
A. Isobars have same no. of nucleon
B. Isotones have same no. of nucleon
C. Isotopes have different no. of nucleon
D. Non of these
6. The mass defect per nucleon _________ as the atomic number increase till iron, for iron the mass defect per nucleon ________ and after iron the mass defect per nucleon _________ as atomic number increase further.
A. Decrease maximum, increase
B. Decrease maximum, decrease
C. increase maximum, decrease
D. Non of these
7. Among the following which nucleon has maximum mass defect binding energy:
A. Fe
B. Kr
C. He
D. U
11. What is the charge number of an α-particle emitted during the phenomenon of radioactivity?
A. -e
B. +2e
C. -2e
D. +e
12. Which one is a container for storing radioactive substance?
A. Lead
B. iron
C. Cadmium
D. Copper
12. Which of following is true for 濠 -rays?
| Charge | Rest mass | |
| A. | Positive | m˳c² |
| B. | Negative | Zero |
| C. | Neutral | m˳c² |
| D. | Neutral | Zero |
13. 濠 -radiation is emitted due to:
A. De-excitation of atom
B. De-excitation of nucleus
C. Excitation of atom
D. Excitation of nucleus
15. The phenomenon of radioactivity is associated with:
A. Decay of nucleus
B. Fusion of nuclei
C. Transmission of radio wave
D. Nuclear reactions caused by cosmic rays
16. After 濐 -emission from neutron, which particle is found?
A. Proton
B. Neutron
C. Electron
D. Proton & electron
17. An α-emission is always accompanied by:
A. 濐 -emission
B. 濠 -emission
C. Both A and
D. Neutron emission B
19. In an α-decay:
A. The parent and daughter nuclei have some number of protons
B. The daughter nucleus has one proton more than parents nucleus
C. The daughter nucleus has two proton less than parents nucleus
D. The daughter nucleus has two proton more than parents nucleus
20. When a radioactive nucleus emits an α-particles, the N/Z ratio:
A. Increase
B. Remains same
C. Decrease
D. Any of these
21. When a radioactive nucleus emits an 濐 -particles, the mass number of the atom?
A. Increase by one
B. Remains same
C. Decrease by one
D. Decrease by four
22. The decay constant 泀 of a radioactive sample:
A. Decrease as the age of atoms increase
B. Increase as the age of atoms increase
C. Is independent of the age
D. Depends on the nature of activity
23. Half-life of a radioactive substance depends upon:
A. Temperature B. Pressure
C. Nature of Substance
D. Electric and magnetic field
24. The half life of radium is about 1600 years. If 100 g radium is existing now, 25 g will remain un-decayed after:
A. 4800 years
B. 6400 years
C. 6400 years
D. 3200 years
26. The half-life of a certain element is 7 days at S.T.P .If the temperature is doubled and pressure is reduced to half then half life of the same element will be:
A. 1.75 days
B. 3.5 days
C. 7 days
D. 14 days
27. Which of the following radiations are more energetic?
A. α
B. 濐
C. 濠
32. Which one of the following radiation possesses maximum penetrating power?
A. α-radiation B. 濠 -rays
C. 濐 -radiation
D. All have equal penetrating power
33. The length of ionization track in Wilson cloud chamber is proportional to:
A. Charge of incident particle B. Mass of incident particle
C. Energy of incident particle D. Shape of incident particle
34. In Wilson cloud chamber the potential difference applied to clear the chamber from unwanted ions is:
A. Exactly 1 kV
B. Exactly 2 kV
C. Of the order of 1 kV
D. Of the order of 2 kV
35. If Wilson cloud chamber is placed in the strong magnetic field we can get information about ________ of the particle.
A. Charge
B. Mass
C. Energy
D. All of these
36. In the Wilson cloud chamber and G.M counter, which of the following property of the radioactive is used to detect the radiations?
A. Radioactive rays are charged
B. Radioactive rays are mono energetic
C. Radioactive rays ionize the gas
D. Radioactive rays produce fluorescence
37. In a Wilson cloud chamber α,濐 and 濠 – radiations are sent. The nature of tracks produced by these particles respectively will be:
A.Thin and long, thick and short, thin and every long B. Thick and short, thin and long, no definite path
C. Thick and long, thin and shorts, no definite path D. Thick and short, thin and long, thick and long
38. In GM counter, the potential difference applied between anode and cathode is:
A. Slightly greater than that required to produce discharge B. Slightly less than that required to produce discharge C. Thick and long, thin and shorts, no definite path
D. Thick and short, thin and long, thick and long
39. Ionization potential of the Quenching gas is ________ than ionization potential of the principal gas.
A. Greater
B. Less
C. Equal
D. Non of these
40. In which detector, the size of the pulse is independent of the energy of the particle:
A. G.M Counter B. Solid state detector
C. Wilson cloud chamber D. All of these
41. After α-decays, the parent and daughter nuclei are called:
A. Isomers
B. Isobars
C. Isotones
D. Isodiapheres
42. The emission of 濐 – particle results in:
A. Isomers
B. Isobars
C. Isotones
D. Isodiapheres
43. Which one is not true about radioactivity?
A. Radioactivity is a stochastic process
B. Half-life only depends on nature of element
C. Decay rate decreases exponentially with time
D. Non of these
45. If the half-life of an element is 10 second, the mean life will be:
A. 14.4 sec
B. 9.93 sec
C. 10 sec
D. Can’t be predicted
46. The any nuclear reaction the energy is released if the binding of reactant is ____________ than binding energy of products.
A. Less
B. Greater
C. Equal
D. Any of these
50. The mass of uranium used in atomic bomb is _________ than/ to critical mass?
A. Less
B. More
C. Equal
D. Much smaller
51. In a nuclear reactor, the quantity of ²³⁵U is increased from:
A. 0.7 to 1 %
B. 2 to 4 %
B. 5 to 10 %
D. Non of these
52. Which of following is used as a moderator?
A. Water
B. Heavy Water
D. Hydrocarbon
D. All of these
53. Fast reactor are designed to make use of:
A. ²³⁵U
B. ²³⁹U
C. ²³⁸U
D. All of these
55. When two deuterons are fused to from a helium atom, the energy given out is:
A. 17 MeV
B. 24 MeV
C. 6 MeV
D. 4 MeV
56. The nuclear waste is dumped into:
A. Old salt mine
B. Oceans
C. Populated areas
D. Non of these
57. In a nuclear reactor the mass of uranium used is _____ than/to critical mass.
A. Greater
B. Less
C. Equal
D. Non of these
58. In Karachi nuclear power plant _______ is used as moderator
A. Water
B. Heavy Water
C. Hydrocarbon
D. Non of these
60. The temperature of core of sun is:
A. 10 million degree Celsius
B. 6000 degree Celsius
C. 20 million degree Celsius
D. Non of these
61. The number of protons taking part in p-p reaction:
A. 4
B. 6
C. 5
D. 2
62. The number of protons used in one complete p-p reaction:
A. 4
B. 6
C. 5
D. 2
63. In the p-p reaction, the energy given out is:
A. 25.7 MeV
B. 17.6 MeV
C. 4.0 MeV
D. 6.4 MeV
65. The sun is primarily composed of:
A. Hydrogen
B. Oxygen
C. Helium
D. Neon
66. A G.M tube records radiations in the absence of any radioactive resource, these are called:
A. Solar radiation
B. Background radiation
C. Metter radiation
D. All of these
67. Cosmic radiation comes to us from:
A. Outer space
C. Earth’s crust
B. Atmosphere
D. Both A & B
68. Cosmic radiations consist of:
A. Charged particles
B. Radioactive particles
C. Electromagnetic rays
D. Both A & B
69. Cosmic radiations consist of:
A. Charged particles
B. Radioactive particles
C. Electromagnetic rays
D. All of these
70. The ultraviolet radiations cause:
A. Sunburn
B. Skim cancer
C. Blindness
D. All of these
71. The most common radioisotopes in food is:
A. K-4o
B. C-42
C. N-14
D. Non of these
72. Which one is bigger unit of radiation strength:
A. Henry
B. Becquerel
C. Curie
D. Non of these
73. The activity of a radiation source has the same dimension as that of:
A. Decay rate
B. Decay constant
C. Frequency
D. All of these
74. How much energy is absorbed by a man of mass 80 kg who receives a lethal whole body equivalent dose of 400 rem in the from of low energy neutron for which RBE factor is 10?
A. 4 Gy
B. 40 Gy
C. 0.4 Gy
D. Non of these
75. Which radiation dose would deposit more energy to the body?
A. 10 mGy to the hand
B. 1 mGy to whole body
C. Both deposit equal energy
D. Can’t be predicted
76. A 75 kg person receivers a whole body radiation dose of 24 m-rad, delivered by α-particle for which RBE factor is 12. The energy absorbed is:
A. 18 mj
B. 28 mj
C. 1.8 mj
D. 24 mj
77. The RBE factor of neutron and protons below 10 MeV for eyes is:
A. 10
B. 20
C. 30
D. 1.7
78. For workers working in nuclear facilities a monthly
A. Loss of hair
B. Ulceration
C. Eye cataracts
D. Drop in white blood cells
79. The dose received while having a chest X-ray is:
A. 200 mSv
B. 1000 mSv
C. 10 mSv
D. 750 mSv
80. “Pu” has half-life:
A. 1600 years
B. 24000 years
C. 6000 years
D. 500 years
81. Technetium ⁹⁹Te is used in:
A. Plasma volume
B. Kidney tests
C. Thyroid uptake scams
D. Plasma volume vein flow
82. Photosynthesis may be traced by:
A. C-12
B. C-13 C.
C-15
D. C-14
83. The circulation of blood is studied by:
A. ²⁴ Na
B. ⁵⁹ Fe
C. ¹²⁵ I
D. ⁹⁹ Te
84. Radiotherapy with _______ from _______ is often used in the treatment of cancer.
A. 濐 -radiations, Cobalt-60
B. 濠 -rays, Strontium-90
C. 濠 -rays, Coblat-90
D. Non of these
85. The isotope phosphorus-32 produces ______ which are used for treatment of skin cancer.
A. 激 -radiation
B. 濐 -radiation
C. 濠 -radiation
D. Non of these
86. The week nuclear force has a range of the order of:
A. 10 ¹⁵ m
B. 10 ¹⁷ m
C. 10 ¹⁰ m
D. 10 ¹² m
87. Friction, Adhesion and cohesion belong to which fundamental force?
A. Gravitational
B. Electromagnetic
C. Week nuclear
D. Strong nuclear
88. Unlike the strong nuclear force, the week nuclear force is sort of _____ force
A. Attractive
B. Repulsive
C. May A & B
D. Non of these
89. Which of following is not an elementary particle?
A. Photons
B. Hadrons
C. Leptons
C. Muons
90. A photons is assumed to be made up of _______ quarks.
A. 2u + 1d
B. 2d + 1u
C. 2u + 2d
D. 3u + 1d
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