# Atoms and Nuclei-Mass-Energy Relation [NEET (NTA)-National Eligibility cum Entrance Test (Medical) Physics]: Questions 1 - 4 of 6

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## Question number: 1

» Atoms and Nuclei » Mass-Energy Relation

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MCQ▾

### Question

If mass equivalent to one mass of electron is completely converted into energy then determine the energy liberated.

### Choices

Choice (4)Response

a.

0.51 MeV

b.

2.12 MeV

c.

1.51 MeV

d.

3.12 MeV

## Question number: 2

» Atoms and Nuclei » Mass-Energy Relation

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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.

2 and 4 are correct

b.

1 and 3 are correct

c.

1,2 and 3 are correct

d.

1 and 2 are correct

## Question number: 3

» Atoms and Nuclei » Mass-Energy Relation

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MCQ▾

### Question

Energy of each photon obtained in the pair production process will be, if the mass of electron or positron is a. m. u-

### Choices

Choice (4)Response

a.

0.213 MeV

b.

0.321 MeV

c.

0.465 MeV

d.

0.123 MeV

## Question number: 4

» Atoms and Nuclei » Mass-Energy Relation

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MCQ▾

### Question

Sun radiate energy in all direction. The average energy received at earth is 1.4 KW/m 2. The average distance between the earth and the sun is 1.5 ⨯ 10 n m. If this energy is released by conservation of mass into energy, then the mass lost per day by the sun is approximately (Use l day = 86400 sec)

### Choices

Choice (4)Response

a.

4.4 ⨯ 10 9 kg

b.

7.6 ⨯ 10 14 kg

c.

3.8 ⨯ 10 12 kg

d.

3.8 ⨯ 10 14 kg.

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