Physics-Objective Related Question Answers
1126. What is required for the propagation of sound?
Medium
1127. When the frequency of the sound wave is increased, what happens to its wave length?
Decreased
1128. Which unit is used to measure the frequency of sound?
Hertz
1129. Normal level of sound is?
60-120 dB
1130. The maximum displacement of the particles of the medium from their equilibrium position?
Amplitude
1131. How is Echo produced?
By the reflection of sound
1132. A wave in which particles of the medium vibrate perpendicular to the direction of propagation of the wave is?
Transverse wave
1133. How is the speed of supersonic plane expressed?
Mach number
1134. Supersonic plane fly with the speed?
Greater than the speed of sound
1135. When will the sound be painful to the ears?
When the sound is above 120 dB
1136. What are the essential characteristics of a wave?
Wave length; amplitude; frequency and velocity
1137. What is known as the study of sound?
Acoustics
1138. Which property of sound is affected by change in air temperature?
Wavelength
1139. Which property of a wave is independent of the other?
Amplitude
1140. Why an astronaut can’t hear his companion at the surface of the moon?
There is no medium for sound propagation
1141. Ultrasonic waves are produced by?
Piezo electric effect
1142. When mechanical waves have a frequency below the audible range it is known as?
Infrasonics
1143. Which wave are used in sonography?
Ultrasonic
1144. When mechanical waves have a frequency above the audible range it is known as?
Ultrasonics
1145. What is the velocity of sound in air?
300 m/s
1146. In which medium the velocity of sound is maximum?
Steel
1147. What is the velocity of sound in vacuum (in m/s)?
0
1148. With the rise in temperature, velocity of sound?
Increases
1149. The velocity of sound in any gas depends upon its?
Density and Elasticity
1150. The energy produced in a nuclear reactor is on account of?
nuclear fission
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