NEET Physics: Questions 1877 - 1881 of 2098

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Question number: 1877

» Gravitation » Kepler's Laws of Planetary Motion

MCQ▾

Question

The semi-major axes of the orbits of mercury and mars are respectively 0.387 and 1.524 in astronomical unit. If the period of Mercury is 0.222 year, what is the period of Mars?

Choices

Choice (4) Response

a.

1.73 years

b.

1.23 years

c.

3.24 years

d.

1.95 years

Question number: 1878

» Oscillations and Waves » Doppler Effect in Sound

MCQ▾

Question

The speed of sound in air at a given temperature is 250 m/s. An engine blows whistle at a frequency of 810 cps. It is approaching the observer with velocity 25 m/s. The apparent frequency in cps heard by the observer will be

Choices

Choice (4) Response

a.

1100

b.

800

c.

900

d.

1000

Question number: 1879

» Gravitation » Orbital Velocity of a Satellite

MCQ▾

Question

A satellite is revolving in an orbit close to the earth’s surface. Taking the radius of the earth as 5.8 ⨯ 10 6 meter, the value of the orbital speed and the period of revolution of the satellite will respectively be (g = 9.8 meter/sec 2)

Choices

Choice (4) Response

a.

7.5 km/sec, 8.0 minutes

b.

2.7 km/sec, 8.51 minutes

c.

7.75 km/sec, 80.51 minutes

d.

7.5 km/sec, 80.51 minutes

Question number: 1880

» Experimental Skills » Galvanometer

MCQ▾

Question

A current of 5.5 A produces a deflection of 45° in the galvanometer. The figure of merit is

Choices

Choice (4) Response

a.

7.5Arad

b.

6.5Arad

c.

7Arad

d.

6Arad

Question number: 1881

» Gravitation » Orbital Velocity of a Satellite

MCQ▾

Question

A satellite has to revolve round the earth in a circular orbit of radius 6 ⨯ 10 3 km. The velocity of projection of the satellite in this orbit will be -

Choices

Choice (4) Response

a.

16kmsec

b.

8.18kmsec

c.

3kmsec

d.

7.08kmsec

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