# Oscillations and Waves (NEET (NTA)-National Eligibility cum Entrance Test (Medical) Physics): Questions 155 - 158 of 195

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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

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## 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

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## 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

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## 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 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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