Atoms and Nuclei (BITSAT Physics): Questions 1 - 7 of 12

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Question number: 1

» Atoms and Nuclei » Half Life and Mean Life

MCQ▾

Question

Half – life of a radioactive material depends on –

Choices

Choice (4) Response

a.

Temperature

b.

Disintegration medium

c.

Nature of material

d.

Material’s amount

Question number: 2

» Atoms and Nuclei » Atomic Masses

MCQ▾

Question

What is the mass of a silver atom? (Avogadro’s number =6.022×1023mol and atomic mass of silver =108 )

Choices

Choice (4) Response

a.

17.93×1026kg

b.

17.93×1033kg

c.

16.81×1029kg

d.

20.12×1031kg

Question number: 3

» Atoms and Nuclei » Energy Levels

MCQ▾

Question

If an electron jumps from 1st orbit to 3rd orbit, then –

Choices

Choice (4) Response

a.

Release energy

b.

Absorb energy

c.

No gain of energy

d.

No loss of energy

Question number: 4

» Atoms and Nuclei » Half Life and Mean Life

MCQ▾

Question

What percent of original radioactive atoms is left after five half – lives?

Choices

Choice (4) Response

a.

3%

b.

10%

c.

5%

d.

20%

Question number: 5

» Atoms and Nuclei » Composition and Size of Nucleus

MCQ▾

Question

92U235 and 92U238 differ as –

Choices

Choice (4) Response

a.

92U235 has 2 protons less

b.

92U238 has 3 neutrons more

c.

92U235 has 3 protons less

d.

All of the above

Question number: 6

» Atoms and Nuclei » Bohr Model

MCQ▾

Question

The mass number of He is 4 and that of sulfur is 32 . The radius of sulfur nucleus is larger than that of helium by a factor of –

Choices

Choice (4) Response

a.

6

b.

4

c.

8

d.

2

Question number: 7

» Atoms and Nuclei » Radioactive Decay Law

MCQ▾

Question

When an electron is emitted from a nucleus, then effect on its “neutron-proton” ratio is

Choices

Choice (4) Response

a.

Decreased

b.

Increased

c.

Remains same

d.

None of the above

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