NEET (NTA)-National Eligibility cum Entrance Test (Medical) Physics: Questions 1913 - 1917 of 2142

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Question number: 1913

» Oscillations and Waves » Resonance

MCQ▾

Question

If in an experiment for determination of velocity of sound by resonance tube method using a tuning fork of 512 Hz, first resonance was observed at 30.7 cm and second was obtained at 63.2 cm, then maximum possible error in velocity of sound is (consider actual speed of sound in air is 332 m/s)

Choices

Choice (4) Response

a.

58 cm/sec

b.

80 cm/sec

c.

204 cm/sec

d.

110 cm/sec

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

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