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Nucleus

Practice Questions:

Question 1: easy

In the given reaction \[_{Z}X^{A}\longrightarrow _{Z}Y^{A’}+n\alpha+n’\beta\]. The ratio (Z/A) will be equal to.

1. \[\frac{Z+n'+2n}{A-4n}\]

2. \[\frac{Z+n'-2n}{A-4n}\]

3. \[\frac{Z-n'+2n}{A+4n}\]

4. \[\frac{Z+n'-2n}{A+4n}\]

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Question 2: easy

A beam of fast moving α-particles was directed towards a thin film of gold. The part A’, B’ and C’ of the transmitted and reflected beams corresponding to the incident parts A, B and C of the beam are shown in the adjoining diagram. The number of α-particle in :

1. B' will be minimum and in C' maximum

2. A' will be maximum and in B' minimum

3. A' will be minimum and in C' maximum

4. C' will be minimum and in B' maximum

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Question 3: easy

Fusion reaction takes place at high temperature because :

1. Molecules break up at high temperature

2. Nuclei break up at high temperature

3. Atoms get ionised at high temperature

4. Kinetic energy is high enough to overcome the coulomb repulsion between nuclei

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Question 4: easy

In radioactive decay process, the negatively charged emitted β – particles are :

1. the electrons orbiting around the nucleus

2. the electrons present inside the nucleus

3. the electrons produced as a result of the decay of neutrons inside the nucleus

4. the electrons produced as a result of collisions between atoms

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Question 5: easy

If the binding energy per nucleon of deuteron is 1.115 MeV, its mass defect in atomic mass unit is :

1. 0.0048

2. 0.0024

3. 0.0012

4. 0.0006

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Question 6: easy

Nuclear forces are :

1. Short ranged attractive and charge independent

2. Short ranged attractive and charge dependent

3. Long ranged repulsive and charge independent

4. Long ranged repulsive and charge dependent

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