KVPY (Kishore Vaigyanik Protsahan Yojana) Stream-SA (Class 11) Physics: Questions 161 - 166 of 253

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Question number: 161

MCQ▾

Question

A ball of mass 5 kg is in motion and has a momentum 25 kg-m/s. A force of 0.8 N acts on it along the direction of the motion for 20 s. The increase in its kinetic energy is,

Choices

Choice (4) Response

a.

118.5 J

b.

105.6 J

c.

91.5 J

d.

127 J

Question number: 162

MCQ▾

Question

If the current through a resistor in a circuit increases by 7%, the power dissipated by the resistor –

Choices

Choice (4) Response

a.

Increases approximately by 49%

b.

Increases approximately by 14%

c.

Increases approximately by 7%

d.

Decreases approximately by 7%

Question number: 163

MCQ▾

Question

A body floating in oil has 50 % of its volume on the surface of the oil. When the same body floats in water, 30 % of its volume is above the water surface. The relative density of oil is –

Choices

Choice (4) Response

a.

1.75

b.

2.0

c.

1.5

d.

1.66

Question number: 164

MCQ▾

Question

A train of length l (165 m) is going towards north directional constant speed v1=12 m/s. A parrot flies at a constant speed of v2 = 3 m/s towards south parallel to be railway track. The time taken by the parrot to cross the train is –

Choices

Choice (4) Response

a.

15 s

b.

18 s

c.

11 s

d.

9 s

Question number: 165

MCQ▾

Question

If for a gas, The atomicity of the gas is-

Choices

Choice (4) Response

a.

Triatomic

b.

Diatomic

c.

Cannot determine

d.

Monoatomic

Question number: 166

MCQ▾

Question

The activity of a radioactive sample reduces to of its original value in 9 hours. What will be its activity in 27 hours?

Choices

Choice (4) Response

a.

b.

c.

d.

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