Current electricity

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

Subscribe on YouTube

Join Our Telegram Channel

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.

Subscribe on YouTube

Join Our Telegram Channel

73. Temperature coefficient of resistance is expressed in terms of

ohms/°C
mhos/ohm°C
ohms/ohm°C
mhos/°C

Detailed SolutionTemperature coefficient of resistance is expressed in terms of

Join Our Telegram Channel

Subscribe on YouTube

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?

Subscribe on YouTube

Join Our Telegram Channel

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

Subscribe on YouTube

Join Our Telegram Channel

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

Subscribe on YouTube

Join Our Telegram Channel

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

Join Our Telegram Channel

Subscribe on YouTube

78. The S.I. unit of power is

Henry
Coulomb
Watt
Watt-hour

Detailed SolutionThe S.I. unit of power is

Subscribe on YouTube

Join Our Telegram Channel

79. All good conductors have high

Conductance
Resistance
Reluctance
Thermal conductivity

Detailed SolutionAll good conductors have high

Subscribe on YouTube

Join Our Telegram Channel

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?

Join Our Telegram Channel

Subscribe on YouTube
Page 1Page 2Page 3Page 4Page 5
Test 1Test 2