# IIT JEE/IIT JEE PHYSICS Current Electricity Sample Test,Sample questions

1.6.6 ohm

2.3.6 ohm

3.3.1 ohm

4.3.0 ohm

1.E

2.E + ir

3.E - ir

4.id - E

1.E

2.E + ir

3.E - ir

4.ir - E

## Question: `A big dry cell A and a small dry cell B have the same emf. The internal resistance of A:`

1.is greater than that of B

2.is equal to that of B

3.is less than that of B

4.may have any value independent of its size

## Question: `A cell of e. m. f. E is connected across resistance R. The potential difference between the terminals of a cell is found to be V. The internal resistance of the cell must be`

1.(E - V) / R

2.(E - V) R

3.2(E - V) / R

4.2 (E - V) / R V

1.r = (R / n)

2.r = nR

3.r = R

4.r = (1 / R)

1.54 V

2.44 V

3.66 V

4.56 V

1.54 V

2.44 V

3.66 V

4.56 V

## Question: `A voltmeter can be constructed from a moving coil galvanometer by:`

1.shunting it with a high resistance

2.shunting it with a low resistance

3.connecting a high resistance in series with it

4.connecting a low resistance in series with it

1.- 0.01 V

2.zero

3.- 0.04 V

4.- 0.06 V

1.- 0.01 V

2.zero

3.- 0.04 V

4.- 0.06 V

1.11%

2.15%

3.21%

4.28%

1.11%

2.15%

3.21%

4.28%

1.40 A

2.20 A

3.16 A

4.24 A

1.40 A

2.20 A

3.16 A

4.24 A

1.3

2.1upon 3

3.8 upon 9

4.2

## Question: `By increasing the temperature the specific resistance of a conductor and a semiconductor:`

1.increases for both

2.decreases for both

3.decreases for both

4.increases decreases respectively

## Question: `For accurate measurements the resistance of a voltmeter should be:`

1.as large as possible

2.equal to the resistance across which the potential difference is to be measured

3.as small as possible

4.infinity

1.halved

2.unchanged

3.doubled

1.40 or 50

2.105 or 95

3.75 or 85

4.145 or 155

## Question: `If an ammeter is to be used in place of a voltmeter then we must connect with the ammeter a:`

1.low resistance in parallel

2.high resistance in parallel

3.high resistance in series

4.low resistance in series

## Question: `If internal resistance of cells is large as compared to the external resistance then the cells should be connected in`

1.series

2.parallel

3.partly in series and party in parallel

4.partly in series and remaining with reversed terminals.

1.Er / R

2.E / R + r

3.E / rR

4.ER / r

## Question: `Mark correct option or options.`

1.In the absence of an electric field electrons move in straight lines between collisions

2.Relaxation time is of order 10-14 second

3.Resistivity is inversely proportional to relaxation time when number of electrons per unit volume of material remains constant

4.All of the above

## Question: `Mixed groups of cells will send the maximum current in the external circuit when total internal resistance is`

1.less than external resistance

2.less than external resistance

3.more than external resistance

4.equal to external resistancezero

## Question: `o convert a galvanometer into an ammeter we should connect:`

1.a low resistance in series with it

2.a high resistance in series with it

3.a low resistance in parallel with it

4.a high resistance in parallel with it

## Question: `Overloading of an electric circuit implies:`

1.drawing of large current

2.connecting high resistance device

3.connecting a large number of electric devices in series with the power supply

4.none of the above

## Question: `Steady current flows in a metallic conductor of non-uniform cross-section. The quantity constant along the length of the conductor is:`

1.current electric field and drift speed

2.drift speed only

3.current and drift speed

4.current only

1.3.7 A

2.5.7 A

3.1.7 A

4.6.7 A

1.E - V / E

2.(E - V / E)R

3.E / E - V

4.(E / E - V)R

1.200%

2.100%

3.50%

4.300%

1.2V / 3

2.V / 6

3.V / 9

4.V / 3

1.2 V

2.3 V

3.4 V

4.1 V

1.1:32

2.1:16

3.8:01

4.4:01

1.4

2.3

3.2

4.1

1.20 CM

2.40 cm

3.30 cm

4.25 cm

## Question: `The sensitivity of a potentiometer can be increased by:`

1.decreasing the length of potentiometer wire

2.increasing the length of potentiometer wire

3.increasing the emf of the cell used in primary circuit

4.all the above methods

## Question: `The thermistors are usually made of:`

1.metals with low temperature coefficient of resistivity

2.metals with high temperature coefficient of resistivity

3.metal oxides with high temperature coefficient of resistivity

4.semiconducting materials having low temperature coefficient of resistivit

## Question: `To convert a galvanometer into voltmeter one should connect:`

1.a low resistance in series with it

2.a high resistance in series with it

3.a low resistance in parallel with it

4.a high resistance in parallel with it

## Question: `To use a moving coil galvanometer as an ammeter one must connect:`

1.low resistance in series with the coil

2.low resistance in parallel with the coil

3.high resistance in series with the coil

4.high resistance in parallel with the coil

1.0.75 V

2.2 V

3.2 V

4.2 V

1.1:02

2.2:01

3.1:04

4.4:01

1.1:02

2.2:01

3.1:04

4.4:01

## Question: `Two resistances are connected in parallel and a current is sent through the combination. The current divides itself:`

1.in the inverse ratio of resistances

2.in the direct ratio of resistances

3.equally in both the resistances

4.in none of the above manner

## Question: `When battery and galvanometer are interchanged in the case of Wheatstone bridge then:`

1.if the bridge was in adjustment before interchange it will not be in adjustment after interchange

2.if the bridge was in adjustment before interchange it will be in adjustment after interchange

3.if the bridge was in adjustment before interchange it may or may not be in adjustment after interchange

4.all of the above

## Question: `When cells are arranged in parallel`

1.the current capacity decreases

2.the current capacity increases

3.the e. m. f. increases

4.the e. m .f. decreases

## Question: `When cells are connected in series`

1.the e.m.f. increases

2.the p.d. decreases

3.current capacity increases

4.the current capacity decreases

## Question: `When cells are connected in series:`

1.the emf increases

2.the PD decreases

3.the current capacity increases

4.the current capacity decreases

## Question: `When the cells of different e. m. fs. and internal resistances are connected in parallels`

1.the e. m. f. increases in comparison with that for single cell

2.the e. m. f. decreases in comparison with that for single cell

3.the current capacity increases in comparison with that for single cell

4.the current capacity decreases in comparison with that for single cell

1.Voltmeter

2.Milivoltmeter

3.Ammeter

4.Miliammeter

## Question: `Which of the following is likely to have the largest resistance?`

1.Moving coil galvanometer

2.An ammeter of range 1A

3.A voltmeter of range 10V

4.A copper wire of length 1 m and diameter 3 cm

1.0.5 V

2.1.5 V

3.2.5 V

4.1.75 V

## More MCQS

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