A nuclear reaction involves:

1. a change in the composition of nucleus
2. redistribution of nuclear particles
3. formation of new element
4. all of these
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Answer: D
Explanation:
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The process of conversion of one element to another by a nuclear change is called:

1. Transmutation
2. decomposition
3. disintegration
4. fission reaction
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Answer: A
Explanation:
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Rate of a nuclear reaction is affected by:

1. temperature
2. pressure
3. concentration
4. none of these
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Answer: D
Explanation:
• Rate of a nuclear reaction is not affected by external factors.
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The reaction in which an atomic nucleus is broken into two or more fragments is called:

1. nuclear fusion reaction
2. nuclear fission reaction
3. nuclear disintegration
4. transmutation
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Answer: B
Explanation:
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Nuclear fission reaction is accomplished by bombarding an atom by:

1. neutrons
2. protons
3. alpha particles
4. all of these
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Answer: D
Explanation:
• Mostly nuclear fission reactions are carried out by bombardment of slow neutrons but alpha particles, protons or deutrons can also be used.
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Cyclotron is a device which:

1. accelerates positively charged particles
2. counts disintegrations per second
3. determines the nature of isotopes
4. all of these
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Answer: A
Explanation:
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Which particles are not accelerated to high kinetic energy by cyclotron:

1. alpha particles
2. protons
3. neutrons
4. none of these
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Answer: C
Explanation:
• Cyclotrons accelerates only positively charged partcles.
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Nitrogen (N-14) when bombarded by an alpha-particle first forms an intermediate unstable nucleus:

1. F-18
2. O-17
3. N-15
4. F-19
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Answer: A
Explanation:
• Alpha particles enter into N-14 nucleus and first form unstable compound nucleus F-18, which at once cleaves to form stable O-17.
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Nitrogen (N-14) when bombarded by an alpha-particle first forms an unstable nucleus F-18 and then cleaves to form stable O-17 with the emission of:

1. alpha-particle
2. beta-particle
3. proton
4. gamma rays
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Answer: C
Explanation:
• When proton emits from ₉F¹⁸, its mass number and atomic number both decrease by one to give ₈O¹⁷.
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₄Be⁹ when bombarded by alpha particle produces which element alongwith the emission of a neutron?

1. ₄Be⁸
2. ₆C¹²
3. ₆C¹⁴
4. ₄Be⁷
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Answer: B
Explanation:
• ₄Be⁹ + ₂He⁴ ࢐ ₆C¹² + ₀n¹
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