NEET (NTA)-National Eligibility cum Entrance Test (Medical) Physics: Questions 1861 - 1864 of 2184

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Question number: 1861

» Communication System » Propagation of Electromagnetic Waves in the Atmosphere

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MCQ▾

Question

In short wave communication which of the following frequencies will be reflected back by the ionosphere layer, having electron density 10 11 per m 3

Choices

Choice (4) Response

a.

12.24 MHz

b.

2.84 MHz

c.

10.42 MHz

d.

18.1 MHz

Question number: 1862

» Gravitation » Energy

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Assertion-Reason▾

Question

Assertion (Ꭺ)

If an earth satellite moves to a lower orbit, there is some dissipation of energy but the speed of gravitational satellite increases.

Reason (Ꭱ)

The speed of satellite is a constant quantity.

Choices

Choice (4) Response

a.

Ꭺ is true but Ꭱ is false

b.

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

c.

Ꭺ is false but Ꭱ is true

d.

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

Question number: 1863

» Gravitation » Kepler's Laws of Planetary Motion

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MCQ▾

Question

The Jupiter’s period of revolution round the Sun is 12 times that of the Earth. Assuming the planetary orbits are circular, how many times the distance between the Jupiter and Sun exceeds that between the Earth and the sun.

Choices

Choice (4) Response

a.

5.242

b.

2.242

c.

3.242

d.

4.242

Question number: 1864

» Oscillations and Waves » Doppler Effect in Sound

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MCQ▾

Question

A source of sound emitting a note of frequency 200 Hz moves towards an observer with a velocity v equal to the velocity of sound. If the observer also moves away from the source with the same velocity v, the apparent frequency heard by the observer is,

Choices

Choice (4) Response

a.

100 Hz

b.

200 Hz

c.

150 Hz

d.

50 Hz