NEET (NTA)-National Eligibility cum Entrance Test (Medical) Physics: Questions 1907 - 1909 of 2184

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Question number: 1907

» Oscillations and Waves » Doppler Effect in Sound

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Question

The source producing sound and an observer both are moving along the direction of propagation of sound waves. If the respective velocities of sound, source and an observer are V, V s and V O, then the apparent frequency heard by the observer will be,

Choices

Choice (4) Response

a.

b.

c.

d.

Question number: 1908

» Gravitation » Orbital Velocity of a Satellite

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Two satellites S 1 and S 2 revolve round a planet in the same direction in circular orbits. Their periods of revolutions are 1 hour and 6 hour respectively. The radius of S 1 is 1.5 ⨯ 10 5 km and the radius of S 2 is 4.95 ⨯ 10 5 km. The velocity of S 2 with respect to S 1 is . The angular velocity of S 2 as actually observed by an astronaut in S 1 is –

Choices

Choice (4) Response

a.

b.

c.

d.

Question number: 1909

» Experimental Skills » Meter Bridge

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In an experiment to determine an unknown resistance, a 100 cm long resistance wire is used. The unknown resistance is kept in the left gap and a known resistance is put into the right gap. The scale used to measure length has a least count 1 mm. The null point B is obtained at 40.0 cm from the left gap. Determine the percentage error in the computation of unknown resistance.

Choices

Choice (4) Response

a.

0.42%

b.

0.50%

c.

0.24%

d.

0.28%