71. Magnetic keepers are used to protect magnets from :
72. Which among the following is the fundamental quantity ?
73. A bucket of water is hung from a spring balance. A piece of iron is suspended in the water without touching the sides or touching the bottom of the bucket. The reading of the spring balance
74. 1 amu is equivalent to
75. 1 m/s equals ________ km/hr
76. A light year is a measure of :
77. The time period of a seconds pendulum is
78. One billionth of a second is called
79. Which one of the following is the value of one nanometer?
80. If the length of a simple pendulum is halved then its period of oscillation is
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