NEET (NTA)-National Eligibility cum Entrance Test (Medical) Physics: Questions 1915 - 1919 of 2184

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Question number: 1915

» Communication System » Amplitude and Frequency Modulation

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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.

7.143

b.

0.71

c.

8

d.

350

Question number: 1916

» Experimental Skills » Potentiometer

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MCQ▾

Question

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

Choices

Choice (4) Response

a.

may increase or may decrease.

b.

Decreasing

c.

Increasing

d.

Remain same

Question number: 1917

» Communication System » Basic Elements of Communication System

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Assertion-Reason▾

Question

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 but Ꭱ is NOT the correct explanation of Ꭺ

b.

Both Ꭺ and Ꭱ are false

c.

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

d.

Ꭺ is true but Ꭱ is false

Question number: 1918

» Communication System » Need for Modulation

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MCQ▾

Question

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

Choices

Choice (4) Response

a.

Reception

b.

Modulation

c.

Detection

d.

Transmission

Question number: 1919

» Experimental Skills » Potentiometer

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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