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Current Electricity Quiz

Total questions: 51

Worksheet time: 29mins

Name
Class
Date
1.

Motion of electrons in conductor is :

a)

Uniform

b)

accelerated

c)

drifting

d)

decelerated

2.

point rule of Kirchoff’s follows the law of conservation of:-

a)

energy

b)

charge

c)

Momentum

d)

Mass

3.

Ohm's law is followed by

a)

Conductor

b)

Semiconductor

c)

Insulator

d)

Both (a) and (b)

4.

The resistivity of material of a conductor depends on

a)

length

b)

Area of cross-section

c)

temperature

d)

all of above

5.

If the length of conducting wire is stretched to double its length. how many times its resistance will be:-

a)

Two times

b)

Three times

c)

Four times

d)

Not change

6.

A wire of 1 resistance is divided into four equal parts & connected in parallel combination, then resistance of combination will be:-

a)

4

b)

1

c)

1/4

d)

1/16

7.

You have three resistance of 1 , then minimum resistance that can obtained due to its combination:-

a)

1

b)

1/2

c)

2

d)

1/3

8.

The equivalent resistance of resistors in parallel combination

a)

increases

b)

decreases

c)

remains same

d)

none of these

9.

Ohm's law is valid when the temperature of conductor is

a)

very low

b)

very high

c)

varying

d)

constant

10.

Electron volt measures the:-

a)

Charge

b)

Potential difference

c)

current

d)

Energy

11.

Power of electric circuit is :-

a)

V. R

b)

V^2/R

c)

V^2/R

d)

V^2R I

12.

Killowatt hour (kWh) is the unit of:-

a)

Power

b)

Energy

c)

Torque

d)

NOT

13.

Ampere-hour is the unit of:-

a)

Power

b)

Charge

c)

Energy

d)

P.d.

14.

The example of a non-ohmic resistance is

a)

Copper wire

b)

filament lamp

c)

carbon resistor

d)

diode

15.

When an electron goes from one point to other point in equipotential region, then work done

a)

On electron

b)

By electron

c)

not work done

d)

infinity work done

16.

If σ = conductivity and = resistivity which relation is correct

a)

σ = 1/

b)

σ =

c)

σ = 1/

d)

None of these

17.

Dimension formulae of resistivity of wire is :-

a)

[ML^3T^-3I^-2]

b)

[ML^2T^-3I^-2]

c)

[ML^3T^1I^-2]

d)

[ML^2T^-3I^-1]

18.

Two cells of e.m.f. e1 and e2 which internal resistance is r1 and r2 are connected in parallel combination. Its equivalent e.m.f. is:-

a)

(e1 + e2)/(r1 + r2)

b)

(e1 + e2)/(r2 + r1)

c)

(e1 + e2)

d)

(e1 + e2)

19.

Two resistance of 2 and 4 are connected in parallel combination. Then ratio of heat generated in circuit through them is :-

a)

2 : 1

b)

1 : 2

c)

4 : 1

d)

1 : 4

20.

If J= current density, σ = conductivity and E = electric field, which relation is correct

a)

J= σ/E

b)

J= σE

c)

J= E

d)

none of these

21.

Which type of the material used for the potentiometer wire

a)

constantan

b)

Manganin

c)

Both (A) and (B)

d)

none of these

22.

Kirchhoff’s law is the result of :-

a)

non conservative form of electric field

b)

conservative form of electric field

c)

conservative form of magnetic field

d)

non conservative form of magnetic field

23.

Two cells having e.m.f. E1 and E2 & due to this cells length of null point is l1 and l2 on wire of potentiometer, then:-

a)

l1 * l2 = ε1 * ε2

b)

l1/l2 = ε1/ε2

c)

l1/l2 = ε2/ε1

d)

l1 * l2 = ε1 * ε2

24.

In parallel combination of n cells we obtain

a)

more voltage

b)

more electric current

c)

less voltage

d)

less electric current

25.

If E be the electric field and T be the relaxation time in a conductor, the drift velocity will be

a)

V=eET/m

b)

Vd = neA

c)

meE/T

d)

me^2E/T

26.

Copper and germanium wire are cooled to 80 K from temperature. The resistance of :-

a)

Both wire decreases

b)

Both wire increases

c)

copper wire decreases and Germanium wire increases

d)

Germanium wire decreases and Copper wire increases.

27.

Dimension formulae of e.m.f. is –

a)

[ML^2T^-2]

b)

[ML^2I^-1T^-2]

c)

[MLT^-2]

d)

[ML^2I^-1T^-3]

28.

In an electric circuit algebraic sum of all current at a point is:-

a)

zero

b)

positive

c)

negative

d)

none of these

29.

The property of a circuit that converts electrical energy into heat is called as:-

a)

Electromotive force

b)

Current

c)

Voltage

d)

Resistance

30.

If a current of 1 A is flowing in a wire through a wire, then number of electrons flowing per second through wire is:- (Let charge on one electron = 1.6 10 -19 C)

a)

0.625 10 13

b)

0.625 10 19

c)

1.6 10 -19

d)

1.6 10 19

31.

There are n identical resistor first all connected in series and then all connected in parallel. The ratio of total resistance in series to that in parallel will be-

a)

n^2

b)

n

c)

n^4

d)

none

32.

On increasing the temperature of a metal its resistance-

a)

increase

b)

decreases

c)

remains constant

d)

none

33.

The ammeter and voltmeter are connected with electrical circuit in:-

a)

Series combination and Parallel combination respectively

b)

Parallel combination and Series combination respectively

c)

Both are in series combination

d)

Both are in parallel combination

34.

Two cells of equal emf are connected in parallel combination, then equivalent emf is:-

a)

Only equal to emf of one cell.

b)

Half of the emf of one cell

c)

Double to the emf of one cell

d)

None of these

35.

Wheat stone bridge measures the :-

a)

High resistance

b)

low resistance

c)

High & low resistance

d)

Potential difference

36.

The dimensions of resistance are given by

a)

[ ML2T -3 A -2 ]

b)

[ MLT -2 A -2 ]

c)

[ MLT -2 A -1 ]

d)

[ MLT -2 A]

37.

The SI unit of specific resistance or resistivity is

a)

Ω.m

b)

Ω.m^2

c)

A.m

d)

A.m -1

38.

The emf of a cell can be measured by:-

a)

Potentiometer

b)

Voltmeter

c)

Galvanometer

d)

Ammeter

39.

The resistance of an electric circuit is halved at constant voltage, the heat generated will be: -

a)

half

b)

two times

c)

four times

d)

same

40.

Two bulb of 60W and 40W are connected in series combination, then equivalent power is:-

a)

100 W

b)

2400 W

c)

30 W

d)

24 W

41.

Two bulb of power (15W-220V) and (60W-220V). Ratio of resistance of their filament is:-

a)

1 : 4

b)

4 : 1

c)

1 : 2

d)

2 : 1

42.

If bulb of 60W and 40W is connected in series combination, then:-

a)

60 W bulb will be more illuminated

b)

40 W bulb will be more illuminated

c)

same illumination for both bulb

d)

Only 60 watts will be illuminated

43.

Electrical energy is converted into heat :-

a)

only when electric current pass through resistance

b)

only when current flows through the junction of two different metals

c)

in both condition when current pass through a resistance and when current flows through the junction of two different metals

d)

none of these

44.

1 kWh is equal to

a)

10^5 J

b)

10^3 J

c)

3.6 x 10^4 J

d)

3.6 x 10^6 J

45.

The resistance of an ideal ammeter is

a)

Zero

b)

Very small

c)

Very large

d)

infinite

46.

Heat generated by 5 register in 20 minute when potential difference is 7 V

a)

140 cal

b)

280 cal

c)

700 cal

d)

2800 cal

47.

The electrical appliances in our houses are connected across supply switch in

a)

series

b)

parallel

c)

mixed grouping

d)

none of these

48.

If the e.m.f. of a dry cell is 1.5 V and its internal resistance is 0.5 . If current due to this cell in external resistance is 1 A, then terminal potential difference of cell is

a)

1.5 V

b)

1 V

c)

0.5 V

d)

0 V

49.

Cell of emf 1.5V is connected directly through 0.05 resistor, if current in circuit is 2A, then internal resistance of cell is:-

a)

0.7

b)

0.8

c)

0.9

d)

1

50.

Kirchhoff's loop rule is based on conservation of

a)

mass

b)

charge

c)

energy

d)

none of these

51.

The specific resistance of a rod of copper as compared to that of thin wire of copper is

a)

less

b)

more

c)

same

d)

none of these