# Physics Karachi Board XI [Sound] Online Test 1

## Physics XI Karachi Board [Sound] MCQS Online Test - 1

Physics Aptitude Test. 20 Questions from Chapter 08-B Sound.
Q1. The change in pitch of sound caused by the relative motion of either the source of sound or the listener is called
Q2. Velocity of sound in vacuum is
Q3. Frequencies less than 20 hertz are called
Q4. Frequencies more than 20,000 hertz are called
Q5. The increase in velocity of sound in air degree C° rise in temperature is
Q6. The periodic increase and decrease in loudness of sound is called
Q7. When two tuning forks frequencies are sounded simultaneously, then the number of beats produced per second is equal to
Q8. Overtones are
Q9. Decibel (or bel) is the unit of
Q10. The intensity level of faintest audible Sound is
Q11. The speed of sound in air at 0°C is
Q12. Pitch of a sound determines
Q13. Speed of sound in air (fluid)
Q14. Sound travels faster
Q15. The observed (apparent) change in the pitch due to the relative between the source and the observer is called
Q16. When a source of sound moved towards a Stationary listener there occurs
Q17. Beats are produced as a result of
Q18. The velocity of sound will have greater value in
Q19. The velocity of sound in air is 340 m/s. The frequency of fundamental mode emitted by an open end organ pipe of length 25 cm is
Q20. The beats produced travel
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