Current electricity

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

Semiconductor
Super-conductor
Compound
Insulator

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class="screen-reader-text">A substance whose molecules consist of dissimilar atoms is called

22. 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

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

23. Temperature coefficient of resistance is expressed in terms of

ohms/°C
mhos/ohm°C
ohms/ohm°C
mhos/°C

Detailed

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48.6-11.4 42.9-11.4 132.3-11.4 132.3s0 89.4 11.4 132.3c6.3 23.7 24.8 41.5 48.3 47.8C117.2 448 288 448 288 448s170.8 0 213.4-11.5c23.5-6.3 42-24.2 48.3-47.8 11.4-42.9 11.4-132.3 11.4-132.3s0-89.4-11.4-132.3zm-317.5 213.5V175.2l142.7 81.2-142.7 81.2z"/> Subscribe on YouTube
SolutionTemperature coefficient of resistance is expressed in terms of

24. 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?

25. 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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dissipate the 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

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

reactance
capacitance
impedance
resistance

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to" class="read-more button" href="https://exam.pscnotes.com/mcq/heat-in-a-conductor-is-produced-on-the-passage-of-electric-current-due-to/#more-45130">Detailed SolutionHeat in a conductor is produced on the passage of electric current due to

27. 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

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then in series. The resultant resistance of the first combination to the second will be

28. The S.I. unit of power is

Henry
Coulomb
Watt
Watt-hour

Detailed SolutionThe S.I.

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unit of power is

29. All good conductors have high

Conductance
Resistance
Reluctance
Thermal conductivity

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

30. 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

Detailed SolutionWhich of the following statement is correct?

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