KVPY Stream SB-SX (Class 12 & 1st Year BSC) Physics: Questions 139 - 142 of 250

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Question number: 139

» Atoms and Nuclei » Binding Energy Per Nucleon

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.

0.5MeV

b.

2.5MeV

c.

7.5MeV

d.

8.0MeV

Question number: 140

» Work, Energy and Power » Kinetic Energy

MCQ▾

Question

A proton (mass 1.67 × 10-27 kg) is accelerated along a straight line by 4.3×1015ms2 . If the length covered is 4.0 cm and initial speed of proton was 3.2×107ms1 , 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

» Physics and Measurement » Dimensions of Physical Quantities

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 σ=hαkBβcγ . Here –

Choices

Choice (4) Response

a.

α=3, β = –4 and γ = 2

b.

α=2,β=3andγ=1

c.

α=3,β=4andγ=3

d.

α=3,β=4andγ=2

Question number: 142

» Kinematics » Motion in a Straight Line

MCQ▾

Question

A rocket is fired upward from the earth’s surface such that it creates an acceleration of 20.2ms2 . 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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