Atoms and Nuclei (NEET Physics): Questions 40 - 44 of 67

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Question number: 40

» Atoms and Nuclei » Radioactivity

MCQ▾

Question

The radioactivity of an element becomes (14) th of its original value in 60 seconds. Then the value of half-life time is,

Choices

Choice (4) Response
a.

5 sec

b.

20 sec

c.

10 sec

d.

30 sec

Question number: 41

» Atoms and Nuclei » Mass-Energy Relation

MCQ▾

Question

On disintegration of one atom of U 235 the amount of energy obtained is 200 MeV. The power obtained in a reactor is 1000 KW. Then

(1) Atoms disintegrated per second in reactor is 3.125 ⨯ 10 16

(2) Atoms disintegrated per second in reactor is 3.125 ⨯ 10 18

(3) Decay in mass per hour is 4 ⨯ 10 -8 kg

(4) Decay in mass per hour is 4 ⨯ 10 -6 kg

Select the correct answers and mark it according to the following codes:

Choices

Choice (4) Response
a.

1 and 3 are correct

b.

1, 2 and 3 are correct

c.

2 and 4 are correct

d.

1 and 2 are correct

Question number: 42

» Atoms and Nuclei » Composition and Size of Nucleus

MCQ▾

Question

The radius of the 30 Zn 64 nucleus is nearly (in fermi) -

Choices

Choice (4) Response
a.

2.4

b.

3.7

c.

1.2

d.

4.8

Question number: 43

» Atoms and Nuclei » Radioactivity

Assertion-Reason▾

Assertion (Ꭺ)

Amongst α, β and γ - rays, γ has maximum penetrating power.

Reason (Ꭱ)

The α- particle is heavier than β and γ rays.

Choices

Choice (4) Response
a. Both Ꭺ and Ꭱ are false
b. Ꭺ is false but Ꭱ is true
c. Both Ꭺ and Ꭱ are true and Ꭱ is the correct explanation of Ꭺ
d. Both Ꭺ and Ꭱ are true but Ꭱ is NOT the correct explanation of Ꭺ

Question number: 44

» Atoms and Nuclei » Atomic Masses

MCQ▾

Question

The ratio of the radii of the nuclei 13 Al 27 and 52 Te 125 is approximately -

Choices

Choice (4) Response
a.

6: 10

b.

14: 73

c.

40: 177

d.

13: 52

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