71. A bird sitting on a high tension electric wire does not get electrocuted, because
72. The approach called 'magnetic confmement of plasma' is the scientific principle of which technique?
73. Some pairs of devices and associated energy changes are given below.
1. Electric generator ⟺ Mechanical to electrical
2. Electric motor ⟺ Electrical to mechanical
3. Diesel engine ⟺ Light to electrical
4. Solar cell ⟺ Chemical to mechanical
Which of the above pair/s is/are correctly matched?
1. Electric generator ⟺ Mechanical to electrical
2. Electric motor ⟺ Electrical to mechanical
3. Diesel engine ⟺ Light to electrical
4. Solar cell ⟺ Chemical to mechanical
Which of the above pair/s is/are correctly matched?
74. What is the relation between Power 'P', Current 'I' and Resistance 'R'?
75. The device used for converting alternating current to direct current is called
76. What does the diagram shows?
77. The work done in two points with a potential difference of 20V is 60 J. Then the electric charge flowing between the two points is:
78. A Galvanometer can be converted into a voltmeter by connecting with it a
79. According to Ohm's law, . . . . . . . . is a constant.
80. Assertion (A) Electric appliances with metallic body have three connections, whereas on electric bulb has a two pin connection.
Reason (R) Three pin connections reduce heating of connecting wires.
Reason (R) Three pin connections reduce heating of connecting wires.
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