Current electricity

72. Are the materials having electrical conductivity much less than most of the metals but much greater than that of typical insulators.

Varistors
Thermistor
Semiconductors
Variable resistors

Detailed SolutionAre the materials having electrical conductivity much less than most

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of the metals but much greater than that of typical insulators.

73. Temperature coefficient of resistance is expressed in terms of

ohms/°C
mhos/ohm°C
ohms/ohm°C
mhos/°C

Detailed Solution

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class="screen-reader-text">Temperature coefficient of resistance is expressed in terms of

74. Which of the following statement is true?

A galvanometer with low resistance in parallel is a voltmeter
A galvanometer with high resistance in parallel is a voltmeter
A galvanometer with low resistance in series is an ammeter

Detailed SolutionWhich of the following statement is true?

75. A 3 ohm resistor having 2 A current will dissipate the power of

2 watts
4 watts
6 watts
8 watts

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power of" class="read-more button" href="https://exam.pscnotes.com/mcq/a-3-ohm-resistor-having-2-a-current-will-dissipate-the-power-of/#more-45523">Detailed SolutionA 3 ohm resistor having 2 A current will dissipate the power of

76. Heat in a conductor is produced on the passage of electric current due to

reactance
capacitance
impedance
resistance

Detailed SolutionHeat in a

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conductor is produced on the passage of electric current due to

77. Three identical resistors are first connected in parallel and then in series. The resultant resistance of the first combination to the second will be

9 times
$$rac{1}{9}$$ times
$$rac{1}{3}$$ times
3 times

Detailed SolutionThree identical resistors are first connected in parallel and then in series.

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The resultant resistance of the first combination to the second will be

78. The S.I. unit of power is

Henry
Coulomb
Watt
Watt-hour

Detailed SolutionThe S.I. unit

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of power is

79. All good conductors have high

Conductance
Resistance
Reluctance
Thermal conductivity

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class="read-more button" href="https://exam.pscnotes.com/mcq/all-good-conductors-have-high/#more-44473">Detailed SolutionAll good conductors have high

80. Which of the following statement is correct?

A semiconductor is a material whose conductivity is same as between that of a conductor and an insulator
A semiconductor is a material which has conductivity having average value of conductivity of metal and insulator
A semiconductor is one which conducts only half of the applied voltage
A semiconductor is a material made of alternate layers of conducting material and insulator

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statement
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is correct?" class="read-more button" href="https://exam.pscnotes.com/mcq/which-of-the-following-statement-is-correct-9/#more-44224">Detailed SolutionWhich of the following statement is correct?
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