Oscillations and Waves (NEET (NTA)-National Eligibility cum Entrance Test (Medical) Physics): Questions 179 - 183 of 195

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Question number: 179

» 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: 180

» Oscillations and Waves » Harmonics

MCQ▾

Question

A string on a musical instrument is 50 cm long and its fundamental frequency is 270 Hz. If the desired frequency of 1000 Hz, is to be produced, the required length of the string is

Choices

Choice (4) Response

a.

10.3 cm

b.

13.5 cm

c.

5.4 cm

d.

2.7 cm

Question number: 181

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

MCQ▾

Question

The frequency of fundamental tone in an open organ pipe of length 0.48 m is 430 Hz. Speed of sound is 430 m/sec. Frequency of fundamental tone in closed organ pipe will

Choices

Choice (4) Response

a.

253.8 Hz

b.

260.0 Hz

c.

243.2 Hz

d.

215 Hz

Question number: 182

» Oscillations and Waves » Doppler Effect in Sound

MCQ▾

Question

The speed of sound in air at a given temperature is 350 m/s. An engine blows whistle at a frequency of 1200 cps. It is approaching the observer with velocity50 m/s. The apparent frequency in cps heard by the observer will be

Choices

Choice (4) Response

a.

2400

b.

1400

c.

1050

d.

600

Question number: 183

» Oscillations and Waves » Doppler Effect in Sound

MCQ▾

Question

The source producing sound and an observer both are moving along the direction of propagation of sound waves. If the respective velocities of sound, source and an observer are V, V s and V O, then the apparent frequency heard by the observer will be,

Choices

Choice (4) Response

a.

b.

c.

d.