NEET (National Eligibility cum Medical Entrance Test) Physics: Questions 1914 - 1918 of 2142

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Question number: 1914

» Communication System » Amplitude and Frequency Modulation

MCQ▾

Question

In an FM system a 7 kHz signal modulates 108 MHz carrier so that frequency deviation is 50 kHz. The carrier swing is

Choices

Choice (4) Response

a.

0.71

b.

8

c.

7.143

d.

350

Question number: 1915

» Experimental Skills » Potentiometer

MCQ▾

Question

If we replaced potentiometer wire by another wire having more resistivity, than potential gradient will be,

Choices

Choice (4) Response

a.

Remain same

b.

Increasing

c.

may increase or may decrease.

d.

Decreasing

Question number: 1916

» Communication System » Basic Elements of Communication System

Assertion-Reason▾

Assertion (Ꭺ)

A dish antenna is highly directional.

Reason (Ꭱ)

This is because a dipole antenna is omnidirectional.

Choices

Choice (4) Response

a.

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

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.

Ꭺ is true but Ꭱ is false

Question number: 1917

» Communication System » Need for Modulation

MCQ▾

Question

The process of superimposing signal frequency (i. e. audio wave) on the carrier wave is known as,

Choices

Choice (4) Response

a.

Modulation

b.

Detection

c.

Reception

d.

Transmission

Question number: 1918

» Experimental Skills » Potentiometer

MCQ▾

Question

A potentiometer works on the principle that

Choices

Choice (4) Response

a.

when a current flows through a wire of uniform thickness and material, potential difference between its two points is inversely proportional to the length of the wire between the points

b.

when a current flows through a wire of uniform thickness and material, potential difference between its two points doesn’t depend on the length of the wire between the points

c.

when a current flows through a wire of uniform thickness and material, potential difference between its two points is directly proportional to the length of the wire between the two points

d.

All of the above

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