Q 1. A sound wave travels from east to west, in which direction do the particles of air move?
(A) East – west
(B) North - south
(C) Up and down
(D) None of these
Q 2. In which medium sound travels faster ?
(A) Solid
(B) Liquid
(C) Gas
(D) None of these
Q 3. What is the name of short duration wave?
(A) Pulse
(B) Frequency
(C) Time period
(D) Velocity
Q 4. What is the velocity of sound in water at room temperature?
(A) 1500 m/s
(B) 330 m/s
(C) 1500 km/s
(D) 330 km/s
Q 5. The unit of quantity on which pitch of the sound depends is :
(A) Hertz
(B) metre
(C) metre/second
(D) second
Q 6. The unit of quantity on which loudness of found depends is :
(A) metre
(B) Hertz
(C) metre/second
(D) second
Q 7. Nature of sound wave is :
(A) transverse
(B) longitudinal
(C) electromagnetic
(D) seismec
Q 8. Pitch of high frequency sound is :
(A) high
(B) low
(C) zero
(D) infinite
Q 9. Voice of a friend is recognized by its :
(A) Pitch
(B) quality
(C) Intensity
(D) velocity
Q 10. Sound waves in air are :
(A) Longitudinal waves
(B) Radio waves
(C) Transverse waves
(D) Electromagnetic waves
Ans: . 1-A 2-A 3-A 4-A 5-A 6-A 7-B 8-A 9-B 10-A
Objective: Fill in the blanks:
1. Pitch is the sensation of the ---------- of an emitted sound.
2. A high pitch sound is called a ------ sound
3. A low pitch sound is called a ----------- sound.
4. Loudness of sound wave is directly proportional to -------- amplitude
5. The sound energy transferred per unit area per unit time is called -------- of sound.
6. When a body moves with a speed which is greater than the speed of sound in air, it is said to be traveling at --------------
7. When wound waves traveling in air enter into the medium of water, ------- remains unchanged
8. Sound travels faster as the ------------ of the medium increases by 0.61 m/s with every 1 deg C
9. ----- is an apparatus which is used to find the depth of a sea or to locate the under water things.
10. A sound wave of single frequency is called ---------
Ans:
1. Frequency
2. shrill
3. hoarse
4. Square
5. intensity
6. supersonic speed
7. Frequency
8. temperature
9. Sonar
10.Tone