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Physics Questions and Answers

57. Which gas in the atmosphere saves us from the ultra violet rays of the sun?
 
  • A. nitrogen
  • B. oxygen
  • C. ozone
  • D. carbon monoxide
 
58. Chemical energy is converted into electrical energy in
 
  • A. dynamo
  • B. motor
  • C. battery
  • D. electric bulb
 
 
59. Which metal is commonly is used for making an electromagnet?
 
  • A. copper
  • B. iron
  • C. nickel
  • D. cobalt
 
60. Sound travels at maximum speed in
 
  • A. vacuum
  • B. air
  • C. water
  • D. steel