71. In an ideal transformer:
72. Coulomb per second is equivalent to
73. Which of the following metals is a better conductor of electricity?
74. A current of 0.75A is drawn by a filament of an electric bulb in 8 minutes. Find the amount of electric charge flowing through the current.
75. Superconductor is the conductor whose . . . . . . . . is zero
76. A fuse wire is characterised by
77. Water is heated with a coil of resistance R connected to domestic supply. The rise of temperature of water will depend on
1. supply voltage.
2. current passing through the coil.
3. time for which voltage is supplied.
Select the correct answer;
1. supply voltage.
2. current passing through the coil.
3. time for which voltage is supplied.
Select the correct answer;
78. The metal detectors operated on which of the law:
79. Two wires have their lengths, diameters and resistivities all in the ratio of 1 : 2. If the resistance of the thinner wire is 10 ohm, the resistance of the thicker wire is
80. Which is not attracted by a simple magnet?
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