Oscillations and Waves-Doppler Effect in Sound [HBCSE Olympiads (Homi Bhabha Centre for Science Education) NSEP (Physics)]: Questions 1 - 2 of 2

Access detailed explanations (illustrated with images and videos) to 63 questions. Access all new questions- tracking exam pattern and syllabus. View the complete topic-wise distribution of questions. Unlimited Access, Unlimited Time, on Unlimited Devices!

View Sample Explanation or View Features.

Rs. 100.00 -OR-

How to register? Already Subscribed?

Question 1

Doppler Effect in Sound

Appeared in Year: 2016

Question

MCQ▾

Two factories are sounding their sirens at each. A man walks from one factory towards the other at a speed of . the speed of sound is . The number of beats heard per second by the man is

Choices

Choice (4)Response

a.

7.5

b.

6

c.

2.5

d.

5

Question 2

Doppler Effect in Sound

Appeared in Year: 2016

Question

MCQ▾

Two identical loudspeakers, placed close to each other inside a room, are supplied with the same sinusoidal voltage. One can imagine a pattern around the loudspeakers with areas of increased and decreased sound intensity alternately located. Which of the following actions will NOT change the locations of these areas?

Choices

Choice (4)Response

a.

Replacing the air in the room with a different gas

b.

Changing the frequency of the signal voltage

c.

Moving one of the speakers

d.

Changing the amplitude of the signal voltage