Atoms and Nuclei (AIIMS Physics): Questions 25 - 29 of 32

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Question number: 25

» Atoms and Nuclei » Half Life and Mean Life

Appeared in Year: 1998

MCQ▾

Question

Half – life period of two radioactive substance are are 40 minute and 20 minute respectively, then after 80 minute ratio of the remaining nuclei will be – (Initially both have equal active nuclei) [AIPMT]

Choices

Choice (4) Response

a.

16: 1

b.

4: 1

c.

1: 2

d.

8: 1

Question number: 26

» Atoms and Nuclei » Radioactive Decay Law

Appeared in Year: 2003

MCQ▾

Question

Initial decay rate of a substance is 800disintegrationsec . If half life of substance is 1sec . then after three second the decay rate will be – [RPMT]

Choices

Choice (4) Response

a.

100disintegrationsec

b.

400disintegrationsec

c.

200disintegrationsec

d.

800disintegrationsec

Question number: 27

» Atoms and Nuclei » Atomic Masses

Appeared in Year: 1996

MCQ▾

Question

The wavelength of Kα X-rays produced by an X-ray tube is 0.76 . The atomic number of the anode material of the tube is – [IIT]

Choices

Choice (4) Response

a.

60

b.

41

c.

80

d.

20

Question number: 28

» Atoms and Nuclei » Half Life and Mean Life

Appeared in Year: 2002

MCQ▾

Question

A sample of radioactive element is containing 4×1015 active nuclei. Half life of element is 10 days, then number of decayed nuclei after 30 days –

[AIPMT]

Choices

Choice (4) Response

a.

2 x 1015

b.

3.5 x 1015

c.

0.5 x 1015

d.

1 x 1015

Question number: 29

» Atoms and Nuclei » Half Life and Mean Life

Appeared in Year: 2004

MCQ▾

Question

The half – life of radium is about 1600 years. Of 100 g of radium existing now, 25 g will remain un – decayed after – [AIPMT]

Choices

Choice (4) Response

a.

3200 years

b.

2400 years

c.

4800 years

d.

6400 years

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