1.At what temperature velocity of sound is double
than that of at 0°C
a) 819 K
b) 819°C
c) 600°C
d) 600 K
Explanation:
2. Velocity of sound is maximum in
a) Air
b) Water
c) Vacuum
d) Steel
Explanation: Velocity of sound in steel is maximum out of the given materials water and air. In vacuum sound cannot travel, it's speed is zero.
3.If velocity of sound in a gas is 360 m/s and the
distance between a compression and the nearest
rarefaction is 1m, then the frequency of sound is
a) 90 Hz
b) 180 Hz
c) 360 Hz
d) 720 Hz
Explanation:
4. If the density of oxygen is 16 times that of
hydrogen, what will be the ratio of their
corresponding velocities of sound waves
a) 1 : 4
b) 4 : 1
c) 16 : 1
d) 1 : 16
Explanation:
5. At which temperature the speed of sound in
hydrogen will be same as that of speed of sound
in oxygen at 100oC
a) – 148oC
b) – 212.5oC
c) – 317.5oC
d) – 249.7oC
Explanation:
6 The wave length of light in visible part \[\left(\lambda_{v}\right)\] and
for sound \[\left(\lambda_{s}\right)\] are related as
a) \[\lambda_{v}>\lambda_{s}\]
b) \[\lambda_{s}>\lambda_{v}\]
c) \[\lambda_{s}=\lambda_{v}\]
d) None of these
Explanation: \[\lambda_{s}>\lambda_{v}\]
7. Which of the following is different from others
a) Velocity
b) Wavelength
c) Frequency
d) Amplitude
Explanation: Amplitude
8.The phase difference between two points
separated by 1m in a wave of frequency 120 Hz is
\[90^{\circ}\] . The wave velocity is
a) 180 m/s
b) 240 m/s
c) 480 m/s
d) 720 m/s
Explanation:
9.The echo of a gun shot is heard 8 sec. after the
gun is fired. How far from him is the surface that
reflects the sound (velocity of sound in air = 350
m/s)
a) 1400 m
b) 2800 m
c) 700 m
d) 350 m
Explanation:
10. A man sets his watch by the sound of a siren
placed at a distance 1 km away. If the velocity of
sound is 330 m/s
a) His watch is set 3 sec. faster
b) His watch is set 3 sec. slower
c) His watch is set correctly
d) None of the above
Explanation:
