Sound Worksheet-2

Sound Worksheet-2

1. A to and fro motion by an object is also called:

(a) periodic motion                      (b) oscillatory motion

(c) cyclic motion                           (d) none of these

2. An object oscillates 50 times in one second. What would be its frequency?

(a) 0.2hz            (b) 0.02hz         (c) 0.002 hz      (d) 50Hz

3. The time period of a simple pendulum is 0.2 sec. What is its frequency of oscillation?

(a) 0.5hz            (b) 5Hz               (c) 50Hz             (d) 1Hz

4. Hertz stands for:

(a) Second         (b) second^–1      (c) Meter           (d) meter^–1

5. An aeroplane travelling at the speed of sound will have a velocity of:

(a) 1000 km/hr                            (b) 1180km/hr

(c) 1540k/hr                                  (d) 1620k/hr

6. Sound is produced in a bamboo flute because:

(a) air starts vibrating                 (b) bamboo starts vibrating

(c) air hits the bamboo               (d) direction of air is changed

7. Loudness or intensity of sound depends upon:

(a) amplitude of sound wave

(b) area of vibrating body

(c) distance from the source of sound

(d) all of these

8. Pitch of sound depends upon:

(a) Frequency                                (b) Amplitude

(c) Loudness                                  (d) distance of source

9. Vibration of air column produces sound in which of the following instruments?

(a) Jaltaranga  (b) Flute             (c) Siren             (d) All of these

10. Which of the following statement is NOT correct?

(a) loudness of sound is determined by the amount of energy received by the ear per unit time

(b) pitch doesn't depend upon the amount of energy

(c) loudness changes with change of frequency

(d) pitch changes with change in frequency

Answer Key:

(1)-(b); (2)-(d); (3)-(b); (4)-(b); (5)-(b); (6)-(a); (7)-(d); (8)-(a); (9)-(d); (10)-(c)