COMEDK-UGET SERIES

Physics

Current Electricity

23 previous year questions.

Volume: 23 Ques

Yield: High

High-Yield Trend

1

2024

1

2022

1

2015

1

2011

1

2010

2

2009

2

2008

2

2007

2

2006

7

2005

3

2004

Chapter Questions
23 MCQs

01

PYQ 2004

medium

physics ID: comedk-u

In a potentiometer experiment, two cells of emf and are used in series in the secondary circuit. The balancing length is found to be 58 cm. If the polarity of is reversed, the balancing length becomes 29 cm. The ratio of the emfs of two cells is :

1

1:01

2

2:01

3

3:01

4

4:01

02

PYQ 2004

medium

physics ID: comedk-u

In the circuit shown, the magnitude and direction of the flow of current is

1

0.8 ampere from A to C via B

2

0.8 ampere from C to A via B

3

0.5 ampere from A to C via B

4

0.5 ampere from C to A via B

03

PYQ 2004

medium

physics ID: comedk-u

A 5.0 amp current is setup in an external by a 6.0 volt storage battery for 6.0 minutes. The chemical energy of the battery is reduced by ....

1

2

3

4

04

PYQ 2005

medium

physics ID: comedk-u

A high resistance voltmeter connected across a cell reads 2 volts. When a resistance of is connected in the cell circuit, voltmeter reading drops to volts. The internal resistance of the-cell is

1

2

3

4

05

PYQ 2005

easy

physics ID: comedk-u

A wire is stretched such that its length -increases by . Its resistance

1

increases by 0.2 %

2

decreases by 0.4%

3

increases by 0.4%

4

increases by 0.1%

06

PYQ 2005

medium

physics ID: comedk-u

An electric lamp marked is used on an average hours a day in a month of days. Cost of electric power consumed at the rate of Rs. 2 per unit is

1

Rs 30

2

Rs 18

3

Rs 9

4

Rs 27

07

PYQ 2005

medium

physics ID: comedk-u

Instrument used to measure e.m.f. of the cell accurately is

1

High resistance Voltmeter

2

Potentiometer

3

Galvanometer

4

Voltameter

08

PYQ 2005

medium

physics ID: comedk-u

When a current flows through a conductor, there will be increase in temperature. This is mainly due to

1

Conduction electrons collide with one another releasing heat energy

2

Ion cores collide with one another releasing heat energy

3

Conduction electrons move from lower to higher level

4

Energy gained by electrons due to the field are given to ion cores

09

PYQ 2005

easy

physics ID: comedk-u

Two concentric circular loops of radii and carry currents such that magnetic field at the centre is zero. If the current in the outer loop is clockwise, current in the inner loop is

1

6.4 A anti-clockwise

2

6.4 A clockwise

3

8 A anti-clockwise

4

3.2 A clockwise

10

PYQ 2005

medium

physics ID: comedk-u

A heating coil takes 6 min to boil certain amount of milk. Another heating coil takes 3 min to boil same amount of milk. Supply voltage is same. When the coils are connected in parallel, time taken to boil same amount of milk is

1

9 min.

2

2 min.

3

4.5 min.

4

3 min.

11

PYQ 2006

medium

physics ID: comedk-u

A wire of resistance 5 ohms is stretched such that longitudinal strain is .The new resistance in ohms is

1

10

2

25

3

30

4

45

12

PYQ 2006

medium

physics ID: comedk-u

At the instant, when potentiometer is balanced, current

1

flows in primary circuit only

2

flows in secondary circuit only

3

flows both in primary and secondary circuits

4

does not flow in any circuit

13

PYQ 2007

medium

physics ID: comedk-u

The resistance of a metallic conductor increases with temperature because

1

Free electron density increases

2

Conductor expands

3

Number of collisions between electrons carriers increases

4

Number of collisions between electrons and vibrating ion core of the conductor increases.

14

PYQ 2007

medium

physics ID: comedk-u

and are three voltmeters of resistances and . When a potential difference? is applied between and, voltmeter readings are and . Then

1

.

2

.

3

.

4

.

15

PYQ 2008

medium

physics ID: comedk-u

A DC source of is connected across two resistors of each connected in series. A voltmeter of resistance is connected across a resistor. It reads

1

20 V

2

30 V

3

10 V

4

5 V

16

PYQ 2008

medium

physics ID: comedk-u

If power is transmitted through a line at, power loss in the form of heat will be

1

0.1 W

2

1 W

3

0.01 W

4

10 W

17

PYQ 2009

medium

physics ID: comedk-u

Ideal voltmeter connected as shown reads

1

16 V

2

12 V

3

4 V

4

8 V

18

PYQ 2009

easy

physics ID: comedk-u

The resistance of mercury at is

1

infinity

2

greater than at lab temperature

3

same as that of lab temperature

4

almost zero

19

PYQ 2010

medium

physics ID: comedk-u

A wire of resistance is uniformly stretched such that.its radius becomes of the original radius. Ratio of the new to old resistance is

1

3

2

9

3

27

4

81

20

PYQ 2011

medium

physics ID: comedk-u

A uniform wire of resistance, of the radius is uniformly drawn until its radius is reduced to, Its new resistance is

1

2

3

4

21

PYQ 2015

medium

physics ID: comedk-u

Silicon doped with arsenic is

1

-type semiconductor

2

-type semiconductor

3

intrinsic semiconductor

4

insulator.

22

PYQ 2022

medium

physics ID: comedk-u

A cell of emf 2V is connected with a load of resistance 1.5Î©. The power delivered by the cell to the load is maximum, then power transferred to the load is

1

0.33 W

2

2.67 W

3

1.33 W

4

3.25 W

23

PYQ 2024

easy

physics ID: comedk-u

The resistance of the galvanometer and shunt of an ammeter are 90 ohms and 10 ohms respectively, then the fraction of the main current passing through the galvanometer and the shunt respectively are:

1

and

2

and

3

and

4

and