Physics-Objective Related Question Answers
1101. Which device converts alternating current (AC) to direct current (DC)?
Rectifier
1102. Which device convert DC to AC?
Electric oscillator
1103. ‘IC’ chip for computers are usually made of?
silicon
1104. The common constituent of transistor is?
germanium
1105. What is a sound?
Sound is a form of energy which produces the sensation of hearing
1106. Sound waves are?
longitudinal waves
1107. The Unit of loudness is?
Decibel
1108. The unit of intensity of light?
Lambert
1109. Sounds with frequencies lower than the lowest limit of human hearing are called?
infrasonic waves
1110. Sounds with frequency higher than 20,000 Hz are known as?
ultrasonic waves
1111. The audible frequency of human ear?
Between 20 hertz & 20;000 hertz
1112. Sounds are distinguished from each other by?
pitch (frequency) loudness (intensity) and quality
1113. Which waves are used in mobile phone?
Micro waves
1114. How is the sound produced?
By the vibration of material body
1115. What is frequency of sound?
The number of vibrations made by a body in one second is called its frequency
1116. Bat can fly at night because it produces?
Ultrasonic sound
1117. The distance travelled by a wave during the time a particle of the medium makes one vibrationis called?
Wave length
1118. The distance travelled by a wave in one second?
Velocity of the wave
1119. What are sound waves?
Longitudinal waves
1120. A wave motion in which the particles of the medium vibrate parallel to the direction of propagation of wave is?
Longitudinal
1121. The reflected sound is called?
Echo
1122. The apparatus used for measuring the depth of the sea on the basis of echo is called?
sonar
1123. How is the sound produced when we speak?
By the vibration of vocal cords
1124. Which sound is produced by Galton whistle?
Ultrasonic
1125. When a harmonium is played, how is the sound produced?
By the vibration of the reeds
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