NEET (NTA)-National Eligibility cum Entrance Test (Medical) Physics: Questions 1815 - 1820 of 2184

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Question number: 1815

» Communication System » Bandwidth of Transmission Medium

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MCQ▾

Question

Audio signal cannot be transmitted because

Choices

Choice (4) Response

a.

The transmitting antenna length is very large and impracticable

b.

The transmitting antenna length is very small to design

c.

The signal cannot be amplified for distance communication

d.

The signal has more noise

Question number: 1816

» 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 5 ⨯ 10 9 per m 3.

Choices

Choice (4) Response

a.

0.14 MHz

b.

0.63 MHz

c.

0.18 MHz

d.

0.28 MHz

Question number: 1817

» Gravitation » Universal Law of Gravitation

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MCQ▾

Question

A satellite of mass m is revolving in a circular orbit of radius r. The relation between the angular momentum J of satellite and mass m of earth will be –

Choices

Choice (4) Response

a.

b.

c.

d.

Question number: 1818

» Communication System » Basic Elements of Communication System

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MCQ▾

Question

Laser beams are used to measure long distances because

Choices

Choice (4) Response

a.

They are highly polarised

b.

They are monochromatic

c.

They have high degree of parallelism

d.

They are coherent

Question number: 1819

» Gravitation » Universal Law of Gravitation

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MCQ▾

Question

If a graph is plotted between T 2 and r 3 for a planet then its slope will be –

Choices

Choice (4) Response

a.

b.

0

c.

d.

Question number: 1820

» Oscillations and Waves » Beats

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MCQ▾

Question

Two sirens situated one kilometer apart are producing sound of frequency 330 Hz. An observer starts moving from one siren to the other with a speed of 5 m/s. If the speed of sound be 330 m/s, what will be the beat frequency heard by the observed

Choices

Choice (4) Response

a.

8

b.

10

c.

4

d.

16