If a radioactive material reduces to 12.5% of its value in 24 days, then its half-life is:

1.  16 days

2.  8 days

3.  4days

4.  2 days

Concept Questions :-

High Yielding Test Series + Question Bank - NEET 2020

Difficulty Level:

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

Concept Questions :-

High Yielding Test Series + Question Bank - NEET 2020

Difficulty Level:

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

Difficulty Level:

1.

2.

3.

4.  ${}_{0}{}^{1}\mathrm{n}$

Concept Questions :-

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

Difficulty Level:

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

Concept Questions :-

High Yielding Test Series + Question Bank - NEET 2020

Difficulty Level:

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

Difficulty Level:

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

1.

2.

3.

4.  ${\left(\frac{1}{2}\right)}^{3}$

Concept Questions :-

High Yielding Test Series + Question Bank - NEET 2020

Difficulty Level:

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

Difficulty Level:

1.  47.12 MeV

2.  34.4 MeV

3.  11.8 MeV

4.  23.6 MeV

Concept Questions :-

Nuclear binding energy