The half-life of a radioactive material depends on

1.  The initial amount of material

2.  Rate of disintegration

3.  Decay constant

4.  Temperature and pressure

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High Yielding Test Series + Question Bank - NEET 2020

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Binding energy per nucleon is:

1.  Maximum for middle-order elements

2.  Maximum for lighter order elements

3.  Maximum for heavier order elements

4.  None of these

Concept Questions :-

Nuclear binding energy
High Yielding Test Series + Question Bank - NEET 2020

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1.

2.

3.

4.  ${}_{0}{}^{1}\mathrm{n}$

Concept Questions :-

Mass-energy equivalent
High Yielding Test Series + Question Bank - NEET 2020

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The half-life of a radioactivity isotope X is 100years. It decays to an element Y which is stable. The two elements are found to be ratio 1: 31 in a sample of a given rock. Assuming that at the time of formation of the rock there was only isotope X, then estimate the age of the rock.

1.  300 years

2.  400 years

3.  500 years

4.  600 years

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High Yielding Test Series + Question Bank - NEET 2020

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A chain reaction is continuous due to

1.  Large mass defect

2.  Large energy

3.  Production of more neutrons in fission

4.  None of these

Concept Questions :-

Mass-energy equivalent
High Yielding Test Series + Question Bank - NEET 2020

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After five half-lives what will be the fraction of the initial substance

1.

2.

3.

4.  ${\left(\frac{1}{2}\right)}^{3}$

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High Yielding Test Series + Question Bank - NEET 2020

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Density (D) of nucleus related to mass no. (A) as

1.

2.

3.

4.

Concept Questions :-

Mass-energy equivalent
High Yielding Test Series + Question Bank - NEET 2020

Difficulty Level:

Heavier nuclei are unstable. The correct statement is :

1.  binding energy per nucleon is small

2.  get stability by nuclear fission

3.  get stability by nuclear fusion

4.  both (1) and (2)

Concept Questions :-

Nuclear binding energy
High Yielding Test Series + Question Bank - NEET 2020

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1.  47.12 MeV

2.  34.4 MeV

3.  11.8 MeV

4.  23.6 MeV

Concept Questions :-

Nuclear binding energy
High Yielding Test Series + Question Bank - NEET 2020

Difficulty Level:

The initial activity of a certain radioactive isotope was measured as 16000 counts per minute. That the only activity measured was due to this and that its activity after 12 hours was 2000 counts/minute. Its half-life, in hours, is nearest to-

1.  9.0

2.  6.0

3.  4.0

4.  3.0

Concept Questions :-