# Oscillations and Waves (NEET (NTA)-National Eligibility cum Entrance Test (Medical) Physics): Questions 184 - 187 of 195

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## Question number: 184

» 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 2 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.

6

c.

4

d.

1

## Question number: 185

» Oscillations and Waves » Beats

MCQ▾

### Question

A person carrying a whistle emitting continuously a note of 272 Hz is running towards a reflecting surface with a speed of 18 km/hour. The speed of sound in air is 345ms -1. The number of beats heard by him is,

### Choices

Choice (4) Response

a.

8

b.

3

c.

4

d.

6

## Question number: 186

» 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: 187

» Oscillations and Waves » Standing Waves in Strings and Organ Pipes

MCQ▾

### Question

A closed organ pipe of length L and an open organ pipe contain gases of densities ρ 1, and ρ 2 respectively. The compressibility of gases are equal in both the pipes. Both the pipes are vibrating in their first overtone with same frequency. The length of the open organ pipe is,

### Choices

Choice (4) Response

a.

b.

c.

d.