Question 71 : The SI unit of resistance is?
1. Coulomb
2. Ohm
3. Volt
4. ampere
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Question 72 : The power dissipated in a resistance is given by?
1. I²R
2. V²/R
3. IV
4. All of these
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Question 73 : In a thermocouple?
1. mechanical energy is converted into heat energy
2. heat energy is converted into mechanical energy
3. heat energy is converted into electrical energy.
4. chemical energy is converted into electrical energy
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Question 74 : Ohm is equivalent to?
1. coulomb /volt
2. ampere / volt
3. volt /coulomb
4. volt/ampere
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Question 75 : A resister carries a current I. The power dissipated is 'P'. The power dissipated if the same resistor carries the current of 31 is?
1. 3P
2. 6P
3. 2P
4. 9P
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Question 76 : All electrical appliances are connected in parallel to each other between the main line and the neutral wire to get?
1. the same current
2. the same potential difference
3. None of these
4. different current and the same potential difference
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Question 77 : If the wire of uniform area of cross-section is cut into two equal parts, the resistivity of each parts will be?
1. four times
2. Halved
3. Remain the same
4. doubled
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Question 78 : Ohm's law obeyed in?
1. a semi conductor
2. a metallic conductor
3. an electron tube
4. in all of the above
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Question 79 : The rate of transfer of charges through a circuit is called?
1. Resistance
2. Energy
3. Potential Difference
4. Current
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Question 80 : The terminal potential difference of a battery is equal to its e.m.f. when its internal resistance is?
1. zero
2. very high
3. very low
4. None of these
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