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Physics Questions and Answers

General Science
117. The density of pure water will be
 
  • A. maximum at 4°
  • B. minimum at 4°
  • C. maximum at 0°
  • D. minimum at 0°
 
 
118. Sound waves in air are
 
  • A. transverse waves
  • B. longitudinal waves
  • C. both
  • D. none of these
 
119. Speed of bodies exceeding the speed of sound are called as
 
  • A. supersonic
  • B. ultrasonic
  • C. infrasonic
  • D. superfast
 
120. A radar which detects the presence of the enemy aircraft uses
 
  • A. sound waves
  • B. radio waves
  • C. electric waves
  • D. ultrasonic waves