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1. In which medium the speed of sound is maximum?
A. Air
B. Granite
C. Water
D. Iron
ANSWER:D
SOLUTION :Iron
2. Name the form of energy which produces a sensation of hearing in our ears.
A. Light
B. Heat
C. Sound
D. None of these
ANSWER:C
SOLUTION:Sound energy is the form of energy that produces a sensation of hearing in our ears. Sound energy is produced when an object vibrates, which causes vibrations in our ears that make us hear a sound.
3. Sound waves__________.
A. Can travel in vaccum
B. Can travel only in solid
C. Can travel only in gases
D. Can travel both in solid and gaseous medium
ANSWER:D
SOLUTION:Sound waves can travel through solids, liquids, and gases, but not in a vacuum.
4. The velocity of sound is maximum in ____.
A. Air
B. Liquid
C. Solid
D. Vacuum
ANSWER:C
SOLUTION:The speed of sound is greatest in solids and decreases as it moves from solids to liquids and liquids to gases. A vacuum cannot conduct sound. Sound travels at different speeds depending on the medium through which it passes.
5. In which of the following option sound may not be across travel?
A. Water
B. Vaccum
C. Iron
D. Air
ANSWER:B
SOLUTION:Sound cannot travel through a vacuum because there are no particles present for vibrations to take place. Sound is a mechanical wave, so it requires a material medium to propagate. Sound can travel through solids and liquids, but not through gases.
6. The velocity of sound in air is approximately__________.
A. 10 km/s
B. 10 mile/min
C. 330 m/s
D. 3X1010 m/s
ANSWER:C
SOLUTION :The velocity of sound waves in air is or 330 m/sec.
7. Ultrasonic are sound waves of frequency _______.
A. Greater than 20,000 Hz
B. Less than 10,000 Hz
C. Equal to 1000 Hz
D. None of these
ANSWER:A
SOLUTION:Ultrasonic refers to sound having frequency higher than the upper audible limit of human hearing. It has frequency above 20,000 Hz.
8. A bio technique in which ultrasonic sound is used _____.
A. Sonography
B. ECG
C. EEG
D. X-ray
ANSWER:A
SOLUTION: Sonography is a bio-technique that uses ultrasonic sound waves to create images of the body’s organs and tissues.
9. Which one of the following is the effect of the flight of supersonic jet?
A. Air pollution
B. Eye disease
C. Depletion in ozone layer
D. None of the above
ANSWER:C
SOLUTION: The effect of supersonic jets on the environment is air pollution, which can lead to ozone layer depletion.
10. What is the decibel level of sound produced by two persons in conversation?
A. About 5 decibel
B. About 10 decibel
C. About 30 decibel
D. About 100 decibel
ANSWER:C
SOLUTION:TNormal conversation is about 30- 60 dB, a lawn mower is about 90 dB, and a loud rock concert is about 120 dB. In general, sounds above 85 are harmful and depends on the length and frequency of the exposure.