KVPY Stream-SA (Class 11) Physics: Questions 159 - 163 of 242

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Question number: 159

» Laws of Motion » Dynamics of Uniform Circular Motion

MCQ▾

Question

A solid sphere of mass 5 kg rolls on a smooth horizontal surface at 12ms . It then rolls up a smooth inclined plane of inclination 600 with the horizontal. The height attained by the sphere before it stops is

Choices

Choice (4) Response

a.

9.8 m

b.

10.28 m

c.

11.14 m

d.

12.22 m

Question number: 160

» Oscillations and Waves » Doppler Effect in Sound

MCQ▾

Question

A tuning fork vibrating at 160 Hz produces a sound wave which travels in air at a speed 300 ms-1. The distance travelled by sound during the time the fork makes 70 vibrations is,

Choices

Choice (4) Response

a.

127 m

b.

131 m

c.

137 m

d.

120 m

Question number: 161

» Work, Energy and Power » Kinetic Energy

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

» Current Electricity » Electrical Energy and Power

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

» Properties of Solids & Liquids » Bernoulli's Principle and Its Applications

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

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