NEET Physics: Questions 1891 - 1894 of 2142

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Question number: 1891

» Oscillations and Waves » Beats

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.

17

d.

20

Question number: 1892

» Oscillations and Waves » Reflection of Waves

Assertion-Reason▾

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 but Ꭱ is NOT the correct explanation of Ꭺ

b.

Ꭺ is false but Ꭱ is true

c.

Ꭺ is true but Ꭱ is false

d.

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

Question number: 1893

» Communication System » Propagation of Electromagnetic Waves in the Atmosphere

MCQ▾

Question

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

Choices

Choice (4) Response

a.

Varying the local oscillator frequency

b.

Tuning the antenna

c.

Varying the frequency of the radio signal to be picked

d.

Question does not provide sufficient data or is vague

Question number: 1894

» Experimental Skills » Potentiometer

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

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