NEET Physics: Questions 1870 - 1873 of 2098

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Question number: 1870

» 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 6.4 ⨯ 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.

7.2 km/sec, 8.6 minutes

b.

7.2 km/sec, 84.6 minutes

c.

0.72 km/sec, 84.6 minutes

d.

2.7 km/sec, 8.6 minutes

Question number: 1871

» Communication System » Amplitude and Frequency Modulation

MCQ▾

Question

In an amplitude modulated wave for audio frequency of 500 cycle/second, the appropriate carrier frequency will be,

Choices

Choice (4) Response

a.

500 cycles/sec

b.

50, 000 cycles/sec

c.

50 cycles/sec

d.

100 cycles/sec

Question number: 1872

» Oscillations and Waves » Beats

Assertion-Reason▾

Assertion (Ꭺ)

Beats cannot be produced by light sources.

Reason (Ꭱ)

Light sources have constant phase difference.

Choices

Choice (4) Response

a.

Ꭺ is true but Ꭱ is false

b.

Ꭺ is false but Ꭱ is true

c.

Both Ꭺ and Ꭱ are true but Ꭱ is NOT the correct explanation of Ꭺ

d.

Both Ꭺ and Ꭱ are true and Ꭱ is the correct explanation of Ꭺ

Question number: 1873

» Communication System » Propagation of Electromagnetic Waves in the Atmosphere

Assertion-Reason▾

Assertion (Ꭺ)

Television signals are not received through sky-wave propagation.

Reason (Ꭱ)

The ionosphere reflects electromagnetic waves of frequencies greater than a certain critical frequency.

Choices

Choice (4) Response

a.

Ꭺ is true but Ꭱ is false

b.

Both Ꭺ and Ꭱ are false

c.

Ꭺ is false but Ꭱ is true

d.

Both Ꭺ and Ꭱ are true and Ꭱ is the correct explanation of Ꭺ

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