NEET Physics: Questions 1814 - 1819 of 2098

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Question number: 1814

» Communication System » Bandwidth of Transmission Medium

MCQ▾

Question

Audio signal cannot be transmitted because

Choices

Choice (4) Response

a.

The signal cannot be amplified for distance communication

b.

The signal has more noise

c.

The transmitting antenna length is very large and impracticable

d.

The transmitting antenna length is very small to design

Question number: 1815

» 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: 1816

» 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.

J=GMmr

b.

J=GMm

c.

J=GMm2r

d.

J=mrM

Question number: 1817

» 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: 1818

» 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.

GM4π2

b.

4πGM

c.

4π2GM

d.

0

Question number: 1819

» 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

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