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PHYSICS MCQs

Total Questions : 3767 | Page 69 of 377 pages
Question 681. Echo is heard due to
  1.    Refraction
  2.    Scattering
  3.    Reflection
  4.    Interference
 Discuss Question
Answer: Option C. -> Reflection
Question 682. The sound produced by a bat is–
  1.    Audible
  2.    Subsonic
  3.    Infrasonic
  4.    Ultrasonic
 Discuss Question
Answer: Option D. -> Ultrasonic
Question 683. A person standing on a railway platform listens to the whistles of arriving and departing trains. The whistle heard is
  1.    The same in both cases in all respects
  2.    Of higher intensity when train arrives
  3.    Of higher pitch when train arrives
  4.    Of higher pitch when train departs
 Discuss Question
Answer: Option C. -> Of higher pitch when train arrives
Question 684. Sound is heard over longer distances on rainy days because
  1.    Sound travels slowly in moist air
  2.    Sound travels faster in moist air
  3.    Moist air does not absorb sound
  4.    Moist air absorbs sound
 Discuss Question
Answer: Option B. -> Sound travels faster in moist air
Question 685. Which phenomenon is responsible for the echo of sound wave?
  1.    Reflection
  2.    Refraction
  3.    Interference
  4.    Polarisation
 Discuss Question
Answer: Option A. -> Reflection
Question 686. Loudness of sound depends on
  1.    Frequency
  2.    Wavelength
  3.    Amplitude
  4.    Pitch
 Discuss Question
Answer: Option C. -> Amplitude
Question 687. Which one of the following animals can hear ultrasonic sound ?
  1.    Rat
  2.    Squirrel
  3.    Cat
  4.    Bat
 Discuss Question
Answer: Option D. -> Bat
Question 688. The instrument which uses sound waves to measure the depth of oceans is
  1.    Radar
  2.    Sonar
  3.    Altimeter
  4.    Venturimeter
 Discuss Question
Answer: Option B. -> Sonar
Question 689. Megahertz is a measurement of
  1.    Frequency
  2.    Speed
  3.    Wavelength
  4.    Capacity
 Discuss Question
Answer: Option A. -> Frequency
Question 690. Echolocation is an adaptation bats use to
  1.    Locate flowering plants
  2.    Hunt insects in flight
  3.    Find warm places for hibernation
  4.    All of the above
 Discuss Question
Answer: Option D. -> All of the above

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