Oscillations and Waves (NEET Physics): Questions 155 - 158 of 192

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Question number: 155

» Oscillations and Waves » Reflection of Waves

Assertion-Reason▾

Assertion (Ꭺ)

Velocity of particles, while crossing mean position (in stationary waves) varies from maximum at antinodes to zero at nodes.

Reason (Ꭱ)

Amplitude of vibration at antinodes is maximum and at nodes, the amplitude is zero, and all particles between two successive nodes cross the mean position together.

Choices

Choice (4) Response

a.

Ꭺ is true but Ꭱ is false

b.

Both Ꭺ and Ꭱ are false

c.

Ꭺ is false but Ꭱ is true

d.

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

Question number: 156

» Oscillations and Waves » Doppler Effect in Sound

MCQ▾

Question

A whistle giving out 461 Hz approaches a stationary observer at a speed of 44 m/s. The frequency heard by the observer in Hz is

Choices

Choice (4) Response

a.

545 Hz

b.

550 Hz

c.

532 Hz

d.

430 Hz

Question number: 157

» Oscillations and Waves » Beats

MCQ▾

Question

Two sirens situated one kilometer apart are producing sound of frequency 330 Hz. An observer starts moving from one siren to the other with a speed of 5 m/s. If the speed of sound be 330 m/s, what will be the beat frequency heard by the observed

Choices

Choice (4) Response

a.

8

b.

4

c.

16

d.

10

Question number: 158

» Oscillations and Waves » Doppler Effect in Sound

MCQ▾

Question

A source of sound and a listener are moving towards each other with a speed 112 of the speed of sound. If the frequency of the note emitted by the source is f, the frequency of the note heard by the listener will be nearly:

Choices

Choice (4) Response

a.

1.20 f

b.

2.0 f

c.

2.20 f

d.

1.18 f

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