Time Left:
600
sec
1. Sound gets reflected from
A. Transparent glass
B. Air
C. Solid or liquid surface
D. Vacuum
2. Reflection of sound follows the same laws as
A. Reflection of light
B. Refraction of light
C. Diffraction of waves
D. Dispersion of light
3. The direction of incident sound, reflected sound, and the normal all lie
A. In different planes
B. In the same plane
C. At random angles
D. Perpendicular planes
4. To reflect sound effectively, the obstacle must be
A. Transparent and smooth
B. Large and hard
C. Small and soft
D. Thin and flexible
5. Which instrument can demonstrate the reflection of sound?
A. Microscope
B. Telescope
C. Two identical paper pipes
D. Magnet
7. The sound which we hear after reflection from a distant surface is called
A. Vibration
B. Echo
C. Noise
D. Timbre
10. The rolling of thunder is due to
A. Vibration of clouds
B. Successive reflections of sound
C. Echo from the ground
D. Air friction
11. The persistence of sound due to repeated reflection is called
A. Resonance
B. Echo
C. Reverberation
D. Diffraction
12. Excessive reverberation in halls is
A. Desirable
B. Harmless
C. Highly undesirable
D. Necessary for echo
13. Reverberation in auditoriums is reduced by using
A. Smooth glass walls
B. Metal sheets
C. Sound-absorbing materials
D. Empty walls
14. Materials like compressed fibreboard and draperies are used in halls because they
A. Reflect sound
B. Absorb sound
C. Refract sound
D. Transmit sound
15. The distance of a reflecting surface from the source can be found using
A. Time taken for light to return
B. Time taken for echo
C. Loudness of sound
D. Frequency of wave
16. In the megaphone, sound is made to travel
A. Randomly
B. In all directions
C. In a particular direction
D. Only upward
17. The stethoscope works on the principle of
A. Refraction of sound
B. Multiple reflection of sound
C. Diffraction of sound
D. Resonance of sound
18. Why are the ceilings of concert halls curved?
A. To beautify the hall
B. To reduce air pressure
C. To direct reflected sound evenly
D. To increase light reflection
19. What is the purpose of a curved sound board behind the stage?
A. To decorate the stage
B. To reduce intensity
C. To spread sound evenly
D. To absorb echo
20. Which of the following uses multiple reflections of sound?
A. Megaphone
B. Trumpet
C. Shehnai
D. All of these
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