NEET Physics Beats Interference and Superposition of Waves MCQs Set A

Question. Maximum number of beats frequency heard by a human being is
(a) 10
(b) 4
(c) 20
(d) 6

Answer: A

Question. Reverberation time does not depend upon
(a) carpet and curtain
(b) volume of room
(c) temperature
(d) size of window

Answer: A

Question. The intensity of harmonic wave
(a) depends upon both, its frequency and not on amplitude
(b) depends upon its amplitude and not on its frequency
(c) depends upon its frequency and not on its amplitude
(d) depends neither on frequency nor on its amplitude

Answer: A

Question. If the intensities of two interfering waves be I₁ and I_2, the contrast between maximum and minimum intensity is maximum, when
(a) I₁ = I₂
(b) I₁ > > I₂
(c) I₁ << I₂
(d) either I₁ or I₂ is zero

Answer: A

Question. Two factories are sounding their sirens at 800 Hz. A man goes from one factory to other at a speed of 2m/s. The velocity of sound is 320 m/s. The number of beats heard by the person in one second will be:
(a) 10
(b) 8
(c) 4
(d) 2

Answer: A

Question. Two sound waves travel in the same direction in a medium. The amplitude of each wave is A and the phase difference between the two waves is 120°. The resultant amplitude will be
(a) A
(b) 3A
(c) 2A
(d) 4A

Answer: A

Question. Two tuning forks P and Q when set vibrating, give 4 beatsper second. If a prong of the fork P is filled, the beats are red uced to 2/5 what is frequncy of P, if that of Q is 250 Hz?
(a) 246 Hz
(b) 250 Hz
(c) 254 Hz
(d) 252 Hz

Answer: A

Question. The wavelength of two waves are 50 and 51 cm respectively. If the temperature of the room is 20°C then what will be thenumber of beats produced per second by these waves, when the speed of sound at 0°C is 332 m/s?
(a) 14
(b) 24
(c) 10
(d) none of these

Answer: A

Question. A tuning fork arrangement (pair) produces 4 beats/sec with one fork of frequency 288 cps. A little wax is placed on the unknown fork and it then produces 2 beats/sec. The frequency of the unknown fork is
(a) 292 cps
(b) 294 cps
(c) 288 cps
(d) 286 cps

Answer: A

Question.  A source of sound gives 5 beats per second when sounded with another source of frequency 100 per second. The second harmonic of the source, together with a source of frequency 205 per second gives 5 beats per second. What is the frequency of the source?
(a) 105 Hz
(b) 205 Hz
(c) 100 Hz
(d) 95 Hz

Answer: A