# KVPY Stream SB-SX (Class 12 & 1st Year B.Sc.) Physics: Questions 139 - 142 of 268

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## Question number: 139

Appeared in Year: 2014

MCQ▾

### Question

The binding energy per nucleon of 5B10 is 8.0 MeV and that of 5B11 is 7.5 MeV. The energy required to remove a neutron from 5B11 is (mass of electron and proton are 9.11 × 1031 kg and 1.67 × 1027 kg, respectively) –

### Choices

Choice (4) Response

a.

b.

c.

d.

## Question number: 140

MCQ▾

### Question

A proton (mass 1.67 × 10-27 kg) is accelerated along a straight line by. If the length covered is 4.0 cm and initial speed of proton was, the gain in kinetic energy is –

### Choices

Choice (4) Response

a.

2.5 MeV

b.

1.3 MeV

c.

1.8 MeV

d.

3.4 MeV

## Question number: 141

Appeared in Year: 2014

MCQ▾

### Question

The dimensions of Stefan-Boltzmann constant σ can be written in terms of Planck’s constant h, Boltzmann constant kB and the speed of light c as. Here –

### Choices

Choice (4) Response

a.

α=3, β = –4 and γ = 2

b.

c.

d.

## Question number: 142

MCQ▾

### Question

A rocket is fired upward from the earth’s surface such that it creates an acceleration of. If after 10 s, its engine is switched off, the maximum height of the rocket from earth’s surface would be – (Assume gravitation field is uniform)

### Choices

Choice (4) Response

a.

2860 m

b.

3050 m

c.

2000 m

d.

2980 m

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