Physics Class 10th
If a sound arrives after______ s, the human ear can distinguish it from the original.
A) 0.10
B) 0.5
C) 1
D) 2
Sound that is reflected and arrives before 0.10 s is called:
A) Echo
B) Reverberation
C) Both A and B
D) None of the above
Acoustics is the study of:
A) Waves
B) Vibrations
C) Sound
D) All of the above
If the absorption of objects is increased, the sound level:
A) Decreases 2 times
B) Decreases variably
C) Remains same
D) None of the above
Placing reflective surfaces behind stage:
A) Decreases the sound delivered to audience
B) Increase the sound delivered to the audience
C) The sound shall remain same
D) Case cannot be determined
Parabolic surfaces are used to:
A) Reflect sound
B) Focus the sound
C) Absorbs the sound
D) Disperse the sound
Jagged surfaces serve which of the following purpose:
A) Absorption of sound
B) Reflection of Sound
C) Focusing the sound
D) Dispersing the sound
Acoustic Protection is the application of _______ material to protect individuals from noise.
A) Flat
B) Porous
C) Jagged
D) Parabolic surfaces
Sound produced by Jet Engine is:
A) 80dB
B) 120 dB
C) 140 dB
D) 148 dB
The Minimum frequency a person can hear is:
A) 2Hz
B) 20Hz
C) 200 Hz
D) None of the above
The Maximum frequency a person can hear is:
A) 2000 Hz
B) 200000 Hz
C) 20000Hz
D) 20000000Hz
Physicist have classified sound into _____ classifications.
A) One
B) Two
C) Three
D) None
The sound below 20Hz is called:
A) Infrasonic
B) Audible
C) Ultrasonic
D) None of the above
The sound above 20000Hz is called:
A) Infrasonic
B) Audible
C) Ultrasonic
D) Hypersonic
The top end hearing range of dogs is:
A) 20kHz
B) 45kHz
C) 60 kHz
D) 64kHzv
The maximum sound range of cats is:
A) 20 kHz
B) 45 kHz
C) 60 kHz
D) 64kHz
Which of the following animals use infrasonic sound to communicate?
A) Elephants
B) Rhinos
C) Whales
D) All of the above
Which of the following is used to communicate on large distances?
A) Infrasonic
B) Audible
C) Supersonic
D) Ultrasonic
The intensity of sound waves increases by 1000 W/m2 . What is this increase equal to in Decibels?
A) 10
B)20
C)30
D) 40
An Echo occurs when surround wave is:
A) Absorbed
B) Transmitted
C) Refracted
D) Reflected