NEET (NTA)-National Eligibility cum Entrance Test (Medical) Physics: Questions 1816 - 1821 of 2144

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Question number: 1816

» Communication System » Propagation of Electromagnetic Waves in the Atmosphere

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.

0.18 MHz

b.

0.14 MHz

c.

0.28 MHz

d.

0.63 MHz

Question number: 1817

» Gravitation » Universal Law of Gravitation

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

MCQ▾

Question

Laser beams are used to measure long distances because

Choices

Choice (4) Response

a.

They have high degree of parallelism

b.

They are highly polarised

c.

They are coherent

d.

They are monochromatic

Question number: 1819

» Gravitation » Universal Law of Gravitation

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.

c.

d.

0

Question number: 1820

» Oscillations and Waves » Beats

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.

4

c.

16

d.

10

Question number: 1821

» Gravitation » Gravitational Acceleration

MCQ▾

Question

At what height above the surface of the earth is the acceleration due to gravity 6 % of its value at the surface? (Take R to be earth radius)

Choices

Choice (4) Response

a.

4R

b.

R

c.

8R

d.

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