NEET (NTA)-National Eligibility cum Entrance Test (Medical) Physics: Questions 1892 - 1895 of 2184

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Question number: 1892

» Oscillations and Waves » Beats

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MCQ▾

Question

Two whistles A and B produces notes of frequencies 500 Hz and 530 Hz respectively. There is a listener at the midpoint of the line joining them. Now the whistle A and the listener are started moving with speed 30 m/s away from the whistle B. If speed of sound be 330 m/s, how many beats will be heard by the listener?

Choices

Choice (4) Response

a.

18

b.

19

c.

20

d.

17

Question number: 1893

» Oscillations and Waves » Reflection of Waves

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Assertion-Reason▾

Question

Assertion (Ꭺ)

In the case of a stationary wave, a person hears a loud sound at the nodes as compared to the antinodes.

Reason (Ꭱ)

In a stationary wave all the particles of the medium vibrate in phase.

Choices

Choice (4) Response

a.

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

b.

Both Ꭺ and Ꭱ are true but Ꭱ is NOT the correct explanation of Ꭺ

c.

Ꭺ is false but Ꭱ is true

d.

Ꭺ is true but Ꭱ is false

Question number: 1894

» Communication System » Propagation of Electromagnetic Waves in the Atmosphere

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MCQ▾

Question

While tuning in a certain broadcast station with a receiver, we are actually,

Choices

Choice (4) Response

a.

Varying the frequency of the radio signal to be picked

b.

Tuning the antenna

c.

Varying the local oscillator frequency

d.

Question does not provide sufficient data or is vague

Question number: 1895

» Experimental Skills » Potentiometer

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MCQ▾

Question

Potential gradient of a potentiometer is equal to

Choices

Choice (4) Response

a.

resistance per unit length

b.

emf per unit length

c.

potential drop per unit length

d.

current per unit length