Current electricity Archives

71. A substance whose molecules consist of dissimilar atoms is called

Semiconductor

Super-conductor

Compound

Insulator

Detailed SolutionA substance whose molecules consist of dissimilar atoms is called

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

73. Temperature coefficient of resistance is expressed in terms of

ohms/Â°C

mhos/ohmÂ°C

ohms/ohmÂ°C

mhos/Â°C

Detailed SolutionTemperature 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

A galvanometer with high 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

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 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. 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 of power is

79. All good conductors have high

Conductance

Resistance

Reluctance

Thermal conductivity

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

Detailed SolutionWhich of the following statement is correct?

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