GENERAL SCIENCE #41
MULTIPLE CHOICE QUESTIONS
1. Note
is a sound ……………
(a) of mixture of several frequencies
(b) of mixture of two frequencies only
(c) of a single frequency
(d) always unpleasant to listen
Answer:
(c)
2. A
key of a mechanical piano struck gently and then struck again but mush harder
this time. In the second case ……………
(a) sound will be louder but pitch will not be different
(b) sound will be louder and pitch will also be higher
(c) sound will be louder but pitch will be lower
(d) both loudness and pitch will remain unaffected
Answer:
(a)
3. In
SONAR, we use ……………
(a) ultrasonic waves
(b) infrasonic waves
(c) radio waves
(d) audible sound waves
Answer:
(c)
4. Sound
travels in air if ……………
(а) particles of medium travel from one place to another
(b) there is no moisture in the atmosphere
(c) disturbance moves
(d) both particles as well as disturbance travel from one
place to another
Answer:
(d)
5. When
we change feeble sound to loud sound we increase its ……………
(a) frequency
(b) amplitude
(c) velocity
(d) wavelength
Answer:
(b)
6. Which
kind of sound earthquake produces before the main shock wave begins?
(a) Ultrasound
(b) Infrasound
(c) Audible sound
(d) None of the above
Answer:
(a)
7. Infrasound
can be heard by which of the following?
(a) Dog
(b) Bat
(c) Rhinoceros
(d) Human beings
Answer:
(c)
8. Before
playing the orchestra in a musical concert, a sitarist tries to adjust the
tension and pluck the string suitably. By doing so, he is adjusting ……………
(a) intensity of sound only
(b) amplitude of sound only
(c) frequency of the sitar string with the frequency of
other musical instruments
(d) loudness of sound
Answer:
(c)
9. The
sound can travel in air when ……………
(a) Particles of medium travel from one place to another
(b) There is no moisture in the atmosphere
(c) Disturbance travel from one place to another
(d) Both particles as well as disturbance travel from one
place to another
Answer:
(c)
10. We
can distinguish between a man’s voice and a woman’s voice of the same loudness
even without seeing them. This is due to a characteristic of sound which
measures the shrillness of sounds. Can you choose the correct unit of the
quantity on which this characteristic of sound depends?
(a) Hertz
(b) Meter/second
(c) Meter
(d) Unitless
Answer:
(a)
11. A
key of mechanical piano is first struck gently and then struck again but much
harder this time. What kind of change in sound will you observe in the second
case?
(a) Sound will be louder but the pitch will not be
different
(b) Sound will be louder and the pitch will also be
higher
(c) Sound will be louder but the pitch will be lower
(d) Both loudness and pitch will remain unaffected
Answer:
(c)
12. The
echo-receiver of a sonar attached to a ship, receives the echo from the bottom
of sea 4 seconds after the ultrasonic waves were sent into the sea. If the
speed of sound in water is 1500 m/s, then what is the depth of the sea?
(a) 6000 m
(b) 3000 m
(c) 15000 m
(d) 3500 m
Answer:
(b)
13. Before
the main shock waves, the earthquake produces the characteristic sound waves
which some animals like rhinoceros can hear. Can you guess the kind of sound
waves produced here?
(a) Infrasonic sounds
(b) Ultrasonic sounds
(c) Audible Sounds
(d) None of these
Answer:
(a)
14. On
increasing the temperature, the speed of sound in air ……………
(a) increases
(b) decreases
(c) does not change
(c) first increases then becomes constant
Answer:
(a)
15. Loudness
measures the sound energy reaching the ear per second and depends on the
amplitude of the sound wave. What is the unit used to measure the loudness of
sound?
(a) Hertz
(b) Decibel
(c) Meter/second
(d) Second
Answer:
(b)
16. We
can easily distinguish between the sounds of the different singers even without
having seen them. This is all due the different quality or timber of their
sounds. On what factor does the quality of sound depend?
(a) Wavelength
(b) Waveform
(c) Wave frequency
(d) Wave amplitude
Answer:
(b)
17. The
bats can fly in the darkness of night without colliding with the other objects
by emitting special sounds while flying. Which characteristic of sound is used
by the bats to navigate?
(a) Ultrasound
(b) Infrasound
(c) Audible sound
(d) None of the above
Answer:
(a)
18. The
sound travels from particle to particle in the form of vibrations and has
different speeds in different mediums. The maximum speed of vibrations which
produce audible sound will be in ……………
(a) Sea water
(b) Ground glass
(c) Human blood
(d) Dry air
Answer:
(b)
19. Which
of the following can produce longitudinal as well as transverse waves under
different conditions?
(a) Bats
(b) Slinky
(c) Tuning fork
(d) None of the above
Answer:
(b)
20. If
the speed of a wave is 380 m/s and its frequency is 1900 Hz, then what will be
the wavelength of the wave?
(a) 20 m
(b) 0.2 m
(c) 200 m
(d) 2 m
Answer:
(b)
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