Atoms and Nuclei-Radioactive Decay Law (AIIMS Physics): Questions 1 - 5 of 8

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Question number: 1

» Atoms and Nuclei » Radioactive Decay Law

MCQ▾

Question

U has 92 protons and 238 nucleons. It decays by emitting an Alpha particle and becomes –

Choices

Choice (4) Response

a.

Np

b.

U

c.

Th

d.

All of the above

Question number: 2

» Atoms and Nuclei » Radioactive Decay Law

Appeared in Year: 2005

MCQ▾

Question

A radioactive material has a half – life of 10 days. What fraction of the material would remain after 30 days –

Choices

Choice (4) Response

a.

0.25

b.

0.5

c.

0.125

d.

0.33

Question number: 3

» Atoms and Nuclei » Radioactive Decay Law

Appeared in Year: 2003

Assertion-Reason▾

Assertion (Ꭺ)

Radioactive nuclei emit β - particles.

Reason (Ꭱ)

Electrons exist inside the nucleus.

Choices

Choice (4) Response

a.

Ꭺ is true but Ꭱ is false

b.

Both Ꭺ and Ꭱ are false

c.

Ꭺ is false but Ꭱ is true

d.

Both Ꭺ and Ꭱ are true but Ꭱ is NOT the correct explanation of Ꭺ

Question number: 4

» Atoms and Nuclei » Radioactive Decay Law

Appeared in Year: 2004

Assertion-Reason▾

Assertion (Ꭺ)

90Sr from the radioactive fail out from a nuclear bomb ends up in the bones of human beings through the milk consumed by them. It causes impairment of the production of red blood cells.

Reason (Ꭱ)

The energetic β – particles emitted in the decay of 90Sr damage the bone marrow.

Choices

Choice (4) Response

a.

Both Ꭺ and Ꭱ are true but Ꭱ is NOT the correct explanation of Ꭺ

b.

Both Ꭺ and Ꭱ are false

c.

Ꭺ is true but Ꭱ is false

d.

Both Ꭺ and Ꭱ are true and Ꭱ is the correct explanation of Ꭺ

Question number: 5

» Atoms and Nuclei » Radioactive Decay Law

MCQ▾

Question

A radioactive material has a half – life of 8 days. What fraction of the material would remain after 48 days –

Choices

Choice (4) Response

a.

0.156

b.

0.0625

c.

0.625

d.

0.0156

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