KVPY Stream-SA (Class 11) Physics: Questions 209 - 213 of 252

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Question number: 209

» Oscillations and Waves » Longitudinal and Transverse Waves

MCQ▾

Question

A tuning fork vibrating at 240 Hz produces a sound wave which travels in air at a speed 475 ms-1. The distance travelled by sound during the time the fork makes 65 vibrations is,

Choices

Choice (4) Response

a.

137.75 m

b.

128.63 m

c.

131 m

d.

120.85 m

Question number: 210

» Properties of Solids & Liquids » Viscosity

MCQ▾

Question

Calculate volume of the water flowing in 14 minutes through a horizontal tube of 0.2 cm diameter, 75 cm long. The pressure head across the ends of the tube is 32 cm of water column. Coefficient of viscosity of water is 9 ⨯ 10-4 S. I unit g = 10 m/s2.

Choices

Choice (4) Response

a.

1.56×109m3

b.

25.6×105m3

c.

1.66×108m3

d.

2.76×109m3

Question number: 211

» Work, Energy and Power » Power

MCQ▾

Question

A person P of mass 72 kg walks up a stair case in 36 sec. Another person Q of mass 54 Kg walks up the same staircase in 6 sec. The ratio of the power generated by P to that by Q is,

Choices

Choice (4) Response

a.

2

b.

16

c.

14

d.

29

Question number: 212

» Work, Energy and Power » Conservation of Mechanical Energy

MCQ▾

Question

A particle is executing linear simple harmonic motion of amplitude A. At what displacement is the energy half kinetic and half potential.

Choices

Choice (4) Response

a.

A4

b.

A2

c.

A2

d.

2A

Question number: 213

» Electrostatics » Electrostatic Potential Energy

MCQ▾

Question

27 identical water drops, carrying equal charge q and having the same potential V, merge together. The energy of the new drop is given as,

Choices

Choice (4) Response

a.

81U

b.

3U

c.

243U

d.

27U

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