Atoms and Nuclei (AIIMS Physics): Questions 5 - 10 of 32

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Question number: 5

» 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: 6

» Atoms and Nuclei » Half Life and Mean Life

Appeared in Year: 2004

MCQ▾

Question

Carbon dating is best suited for determining the age of fossils if their age in years is of the order of –

Choices

Choice (4) Response

a.

104

b.

105

c.

106

d.

103

Question number: 7

» 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: 8

» Atoms and Nuclei » Half Life and Mean Life

Appeared in Year: 2003

MCQ▾

Question

A radioactive substance decays to 116th of its initial activity in 40 days. The half-life of the radioactive substance expressed in days is –

Choices

Choice (4) Response

a.

5

b.

10

c.

20

d.

2.5

Question number: 9

» 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: 10

» Atoms and Nuclei » Nuclear Fission and Fusion

Appeared in Year: 2004

Assertion-Reason▾

Assertion (Ꭺ)

Energy is released in nuclear fission.

Reason (Ꭱ)

Total binding energy of the fission fragments is larger than the total binding energy of the parent nucleus

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 true and Ꭱ is the correct explanation of Ꭺ

c.

Ꭺ is true but Ꭱ is false

d.

Both Ꭺ and Ꭱ are false

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