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Physics

General Knowledge on Physics

(Click on suggested Options to select the answer | Color Red means : Wrong & Green Means: Correct)
71. The time period of a simple pendulum having a spherical wooden bob is 2s. If the bob is replaced by a metallic one twice as heavy , the time period will be
72. When you pull out the plug connected to an electric appliance, you will often observe a spark. To which property of the appliance is this related ?
73. The focal length of convex lens is
  • A. the same for all the colours
  • B. shorter for blue light than for red
  • C. shorter for red light than for blue
  • D. maximum for yellow light
  • Check Answer | Discussion
74. Which one of the following causes green house effect?
75. Which one of the following pairs of physical quantities may be represented in the same unit?
76. Why is it easier to swim in sea water?
  • A. Atmospheric pressure is highest at the sea
  • B. Sea water contains salt
  • C. Density of sea water is higher than the ordinary water
  • D. None of the above
  • Check Answer | Discussion
77. The spread in colours in a rainbow on sky is primarily due to
  • A. dispersion of sunlight
  • B. reflection of sunlight
  • C. refraction of sunlight
  • D. total internal reflection of sunlight
  • Check Answer | Discussion
78. An astronaut of mass 60 kg is revolving around the earth in a satellite. What will be his weight inside the satellite (assuming g = 10/s)?
79. In terms of magnetic properties, oxygen belongs to
80. What will happen if the star having mass greater than five times of the Sun is dead ?

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