# NCERT Class 12/Current Electricity Class 12 MCQs Questions Sample Test,Sample questions

## Question: `1 kilowatt hour is commonly known as :`

1.unit

3.1 curie

4.None of the above

1.0.2 Ω

2.5 Ω

3.0.4 Ω

4.0.04 Ω

## Question: `A galvanometer acting as a volt meter will have with its coil.`

1.a high resistance in parallel

2.a high resistance in series

3.a low resistance in parallel

4.a low resistance in series

## Question: `A potential difference of 10 V is applied across a conductance of 2 S. The current in the conductor will be :`

1.20 A

2.5 A

3.0.2 A

4.None of the above

## Question: `A potential difference of 10 V is applied across a conductance of 2 S. The current in the conductor will be :`

1.20 A

2.5 A

3.0.2 A

4.None of the above

## Question: `A potential difference of 10 V is applied across a conductance of 2 S. The current in the conductor will be :`

1.20 A

2.5 A

3.0.2 A

4.None of the above

1.H/9

2.9 H

3.3 H

4.H/3

1.2/3 Ω

2.3/2 Ω

3.1/2 Ω

4.1/3 Ω

1.4 : 1

2.8 : 1

3.2 : 1

4.1 : 2

1.500 W

2.730 W

3.1000 W

4.1125 W

## Question: `Copper wire is used as connecting wire because :`

1.copper has high electrical resistivity

2.copper has low electrical resistivity

3.copper has low electrical conductivity

4.copper has high value of elasticity

## Question: `Emf is measured in :`

1.joule

2.joule/coulomb

3.joule-coulombs

4.joule/coulomb/metre

1.3

2.4

3.5

4.6

1.2

2.3

3.4

4.5

## Question: `How many joules are equal to I kWh ?`

1.3.6 × 104

2.3.6 × 105

3.3.6 × 106

4.None of the above

## Question: `How much electric energy is consumed by a 100 W lamp used for 6 hours everyday for 30 days?`

1.18 kJ

2.18 kWh

3.1.8 J

4.None of the above

1. L, 2A

2.L/2, 2A

3.2L, 2A

4.2l, A/2

1.40 Ω

2.20 Ω

3.10 Ω

4.5 Ω

1.H1 = H2

2.H1 < H2

3.H1 > H2

4.H1 > H2

1.(a) halved

2.doubled

3.unchanged

## Question: `Kirchhoffs first and second laws for electrical circuits are consequences of:`

1.conservation of energy

2.conservation of electrical charge and energy respectively

3.conservation of electric charge

4.neither conservation of energy nor electric charge

1.4 Ω

2.2 Ω

3.1Ω

4.1/2 Ω

1.2 R

2.R

3. R/2

4.R/4

1. n²R

2.R/n²

3.R/n

4. nR

1.very low

2. very high

3.varying

4. constant

## Question: `Potentiometer measures the potential difference more accurately than a voltmeter because:`

1. It has a wire of high resistance

2.It has a wire of low resistance

3.It does not draw current from external circuit

4. It draws heavy current from external circuit

## Question: `Siemen is the unit of:`

1.resistance

2.conductance

3.specific conductance

4.None of the above

1.temperature

2.pressure

3.magnetic field

4.volume

1.1

2.2

3.1/2

4.1/4

1.2.5 V

2.4.5 V

3.8.6 V

4.12 V

## Question: `The example of a non-ohmic resistance is:`

1.copper wire

2.fi lament lamp

3.carbon resistor

4.diode

## Question: `The heat sensitive device whose resistivity changes very rapidly with change of temperature is called a :`

1.resistor

2.super-conductor

3.thermocouple

4.thermistor

## Question: `The length and radius of an electric resistance of a certain wire are doubled simultaneously, then the:`

1.resistance will be doubled and specific resistance will be halved

2.resistance will be halved and specific resistance will remain uncharged

3.resistance will be halved and the specific resistance will be doubled

4.resistance and specific resistance will both remain uncharged

## Question: `The length of a conductor is halved. Its resistance will be :`

1.halved (b) (c) (d)

2.doubled

3.unchanged

1.6.25 × 1016

2.6.25 × 1017

3.6.25 × 1018

4.6.25 × 1019

## Question: `The phenomenon of super-conductivity was discovered by :`

1.Ohm

2.Onnes

3.Edison

4.None of the above

1.2 Ω

2.120 Ω

3.12 KΩ

4.120 MΩ

## Question: `The specific resistance of a conductor increases with :`

1.increase in temperature

2.increase in cross-sectional area

3.decrease in length

4.decrease in cross-sectional area

## Question: `The specific resistance of a rod of copper as compared to that of thin wire of copper is :`

1. less

2.more

3.same

4.depends upon the length and area of cross-section of the wire

1.3 × 104 ms-1

2.3 × 106 ms-1

3.3 × 108 ms-1

4.3 × 1010 ms-1

## Question: `The temperature coefficient of resistance is expressed in :`

1.°C

2.°C-1

3.m°C-1

4.None of the above

1.Joule

2.Peitier

3.Thomson

4.Seebeck

1.10 V

2.10 V

3.10 V

4.10-12 V

## Question: `Two bulbs 25 W, 220 V and 100 W, 220 V are given. Which has higher resistance?`

1.25 W

2.100 W

3.both bulbs have equal resistance

4.resistance of bulbs can not be compared

1.2P

2.4 P

3.p/4

4.P

1.H1 = H2

2.H1 < H2

3.H1 > H2

4.H1 > H2

1. R

2.2 R

3.R/2

4.6 R

1. H1 = H2

2.H1 < H2

3.H1 > H2

4. H1 ≥ H2

1.20 W

2.60 W

3.180 W

4.10 W

1.Tungsten

2.Carbon

3.Nichrome

4.Platinum

## Question: `Why is the Wheatstone bridge more accurate than other methods of measuring resistances: ‘`

1.It is a null method

2. It is based on Kirchhoffs laws

3.It has four resistances

4.It does not involve ohm’s law

## More MCQS

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