General Science | Physics | Sound
General Science | Physics | Sound
1. In which medium the speed of sound is maximum at a temperature of around 20°C?
Air
Granite
Water
Iron
Correct Answer
Wrong Answer
2. Sound waves
can travel in vacuum
can travel only in solid
can travel only in gases
can travel both in solid and gaseous medium
Correct Answer
Wrong Answer
3. The velocity of sound is maximum in
Air
Liquid
Metal
Vacuum
Correct Answer
Wrong Answer
4. Sound waves travel fastest in
Solids
Liquids
Gases
Vacuum
Correct Answer
Wrong Answer
5. In which of the following option sound may not be across travel?
Water
Vacuum
Iron
Air
Correct Answer
Wrong Answer
6. Sound waves do not travel in
Solids
Liquids
Gases
Vacuum
Correct Answer
Wrong Answer
7. The walls of the ball, built for music concerts should
Amplify sound
Transmit sound
Reflect sound
Absorb sound
Correct Answer
Wrong Answer
8. How much should minimum distance be between the source of sound and reflecting surface, so that an echo can be heard clearly?
10 metre
17 metre
24 metre
30 metre
Correct Answer
Wrong Answer
9. Two astronauts cannot hear each other on the Moon's surface, because
Their ears have stopped working on the Moon
No atmosphere on the Moon
They wear special space suits on the Moon
The sound travels much more slowly on Moon
Correct Answer
Wrong Answer
10. An astronaut cannot hear his companion at the surface of the Moon because
Produced frequencies are above the audio frequency
Temperature is too low during night and too high during day
There is no medium for sound propagation
There are many craters on the surface of the Moon
Correct Answer
Wrong Answer
11. What is the purpose of 'evolved Laser Interferometer Space Antenna (eLISA)' project?
To detect neutrinos
To detect gravitational waves
To detect the effectiveness of missile defence system
To study the effect of solar flares on our communication systems
Correct Answer
Wrong Answer
12. Ultrasonics are sound waves of frequency
Greater than 20,000 Hz
Less than 10,000 Hz
Equal to 1000 Hz
None of the above
Correct Answer
Wrong Answer
13. A biotechnique in which ultrasonic sound is used
Sonography
E.C.G.
E.E.G.
X-ray
Correct Answer
Wrong Answer
14. Bats can fly during dark nights and also prey. This is because
The pupil of their eyes is large
Their night vision is very good
Every bird can do this
They produce ultrasonic waves and are guided by them
Correct Answer
Wrong Answer
15. Which one of the following is the effect of the flight of supersonic jet?
Air pollution
Eye disease
Depletion in ozone layer
None of the above
Correct Answer
Wrong Answer
16. Decibel is used to measure
Haemoglobin in blood
Sugar in urine
Sound in atmosphere
Particles in air
Correct Answer
Wrong Answer
17. Decibel unit is used to measure
Light intensity
Sound intensity
Magnitude of earthquake
None of the above
Correct Answer
Wrong Answer
18. What is the decibel level of sound produced by two persons in conversation?
About 5 decibel
About 10 decibel
About 30 decibel
About 100 decibel
Correct Answer
Wrong Answer
19. A noise level of 100 decibel would correspond to
Just audible sound
Ordinary conversation
Sound from a noisy street
Noise from a machine shop
Correct Answer
Wrong Answer
20. As per the WHO, the safe noise level for a city is
45 dB
50 dB
55 dB
60 dB
Correct Answer
Wrong Answer
21. The tolerable limit of noise for human being is around
45 decibel
85 decibel
125 decibel
155 decibel
Correct Answer
Wrong Answer
22. Sound above what level (in decibel) is considered hazardous noise ipollution?
30 dB
100 dB
80 dB
120 dB
Correct Answer
Wrong Answer
23. The optimum sound level for human beings is
90 dB
60 dB
120 dB
100 dB
Correct Answer
Wrong Answer
24. A worker was working on the rail track. A boy at a distance holds his ear near the rail track. This boy was able to hear sound of the blow of workman twice. It is because of
The speed of sound is greater in steel than in air
The speed of sound is greater in air than in steel
Part of the sound wave is reflected between the rail tracks
His ears are at different distance from the source
Correct Answer
Wrong Answer
25. When the same note is played on a sitar and a flute, the sound produced can be distinguished from each other because of the difference in
pitch, loudness and quality
pitch and loudness
quality only
loudness only
Correct Answer
Wrong Answer
26. Which of the following has the longest wavelength?
Infrared
X-rays
Visible light
Radio waves
Correct Answer
Wrong Answer
27. Which one of the following does a TV remote control unit use to operate a TV set?
Light waves
Sound waves
Micro waves
Radio waves
Correct Answer
Wrong Answer
28. Which type of electromagnetic radiation is used in the remote control of a television?
Infra-red
Ultraviolet
Visible
None of these
Correct Answer
Wrong Answer
29. The Doppler's effect is applicable for
Light waves
Sound waves
Space waves
Both (A) and (B)
Correct Answer
Wrong Answer
30. When T.V. is switched on
Audio and video both start simultaneously
Audio is heard immediately but video starts later because video needs some warm up time
Video starts immediately but audio is heard later because sound travels at a lesser speed than light
It depends on the T.V. brand
Correct Answer
Wrong Answer
31. In television broadcast, the picture signals are transmitted by
Amplitude modulation
Frequency modulation
Phase modulation
Angle modulation
Correct Answer
Wrong Answer
32. The technique used to transmit audio signals in television broadcast is
Amplitude modulation
Pulse code modulation
Frequency modulation
Time dimension multiplication
Correct Answer
Wrong Answer
33. A radio station broadcast at 30 metre band. The frequency of the carrier wave transmitted by this station is
10 kHz
100 kHz
10 MHz
100 MHz
