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