Science Class 6th
541. Which one is not a rough surface?
A. Paper
B. Wall
C. Cloth
D. Mirror
542. Sound stimulates sense of ________.
A. Sight
B. Hearing
C. Taste
D. Touch
543. Sound travels as ________ waves.
A. Longitudinal
B. Waves
C. Particles
D. None of these
544. Sound is produced by _________ body.
A. Body
B. Loud speaker
C. Vibrating body
D. None of these
545. Which of these is necessary for hearing sound?
A. Vibration
B. Medium
C. Receiver
D. All of these
546. Hearing takes place when vibrations of frequency between ________ reaches our ears.
A. 30 Hertz to 40000 Hertz
B. 20 Hertz to 20,000 Hertz
C. 50 Hertz to 50000 Hertz
D. None of these
547. When something is moved _______ us done.
A. Work
B. Energy
C. Power
D. None of these
548. Sound can’t travel without ________.
A. Medium
B. Electricity
C. None of these
549. Loons are?
A. Animals
B. Birds
C. None of these
550. When Loons produce sound, they sound like?
A. Laughing
B. Crying
C. Hissing
D. None of these
551. The distance covered by sound in unit time is called ________ of sound.
A. Velocity
B. Speed
C. Acceleration
D. None of these
552. At a temperature of OoC, the speed of sound in air, dry sea level is ________ m/s.
A. 332
B. 330
C. 380
D. 400
553. The speed of sound increases with increase in _______.
A. Air
B. Temperature
C. None of these
554. ear helps in maintaining balance of the body.
A. Outer ear
B. Middle ear
C. Inner ear
D. All of these
555. Speed of sound at 20oC is _______ m/s.
A. 320
B. 340
C. 350
D. 360
556. Speed of sound is fastest in?
A. Solid
B. Liquid
C. Gas
D. None of these
557. Speed of sound in water is _________ m/s.
A. 1600
B. 1500
C. 1400
D. 1525
558. Speed of sound in Iron is ______ m/s.
A. 5130
B. 5000
C. 6000
D. 8000
559. Ear drum of ear is very?
A. Tough
B. Sensitive
C. Hard
D. None of these
560. Back and forth movement of object is called?
A. Noise
B. Sound
C. Vibration
D. None