Free Printable [10th] ELECTRICITY

1.

1. The S.I. unit of charge is--

a)

Coulomb

b)

volt

c)

Ampere

d)

None of the above

2.

2. When a glass rod is rubbed with skin cloth, then the charge produced on glass rod is --

a)

Negative charge

b)

positive charge

c)

Both

d)

None of the above

3.

The force between two like charges is --

a)

Attraction force

b)

Repulsion force

c)

Both

d)

None of the above

4.

1 coulomb charge contains the charge on --

a)

10 electron

b)

100 electron

c)

1.6 x $10^{-19}$ C

d)

6.25 x $10^{18}$ electron

5.

The potential at a point is 20 V . The work done in bringing a charge of 0.25 C from infinity to this point will be -

a)

10 J

b)

5 J

c)

1 J

d)

40 J

6.

S . I. Unit of potential difference is -

a)

Joule

b)

Volt / sec

c)

Volt

d)

Ampere

7.

S . I. Unit of electric current is -

a)

Ampere

b)

Volt

c)

Joule

d)

Newtons.

8.

Joule / Coulomb is similar to the -

a)

Ampere

b)

Watt

c)

Volt

d)

Ohm

9.

The device used to measure the potential diffrence is -

a)

Ammeter

b)

Voltmeter

c)

Rheostat

d)

Galvanometer

10.

The resistance of voltmeter should be -

a)

Very low

b)

very high

c)

zero

d)

None of the above

11.

The device used to measure the electric current is -

a)

Ammeter

b)

Voltmeter

c)

Resistor

d)

None of the above

12.

In a metal -

a)

All the electrons are free to move

b)

All the electron are bound to their parent atoms

c)

There are no electrons

d)

Some electrons are free to move

13.

Electric potential can be expressed as -

a)

Work x charge

b)

Work x current

c)

Work / current x time

d)

Work x current / time

14.

The number of free electrons constituting one coulomb of charge is -

a)

6.25 x $10^{18}$

b)

6.25 x $10^{19}$

c)

6.25 x $10^{20}$

d)

6.25 x $10^{21}$

15.

The potential difference across a 4 $\Omega$ resistor is 8 V . The current flowing through the resistor will be :

a)

2 A

b)

3 A

c)

4 A

d)

5 A

16.

The S. I. unit of electrical resistance is :

a)

Ampere

b)

Ohm

c)

Volt

d)

None of these

17.

In ohm's law , the quality expressed by the reciprocal of the slope of V-I curve is :

a)

Current

b)

Potential difference

c)

Resistance

d)

All of these

18.

A car headlight bulb works on a 12 V battery draws a current of 0.5 A ,the resistance of bulb is :

a)

0.5 ohm

b)

6 ohm

c)

12 ohm

d)

24 ohm

19.

The best conductor is :

a)

Silver

b)

Copper

c)

Iron

d)

Wood

20.

Ohm's law gives the relationship between :

a)

Current and voltage

b)

Resistance and voltage

c)

Current and resistance

d)

Voltage and electric charge

21.

The substance whose resistivity is infinity high is called :

a)

Resistor

b)

Conductor

c)

Insulator

d)

Alloy

22.

With increase in temperature of a resistance wire , its resistance :

a)

Increases

b)

Decreases

c)

Remains unchanged

d)

None of these

23.

The resistivity of substance depends on the :

a)

Length of conductor

b)

Area of cross - section of conductor

c)

Temperature of conductor

d)

All of these

24.

Keeping the potential difference constant the resistance of a circuit is halved . The current will become :

a)

one - third

b)

Double

c)

One - fourth

d)

Four times

25.

S. I. Unit of resistivity is :

a)

Ohm-cm

b)

Ohm-m

c)

Volt

d)

Ohm

26.

When area of cross section of a conductor is doubled , its resistance becomes :

a)

Double

b)

Half

c)

Three times

d)

Four times

27.

When area of cross section of a conductor is halved ,then its resistance becomes :

a)

Doubled

b)

Halved

c)

4 times

d)

3 times

28.

A wire is drawn such that its radius changes from r to 2r . The new resistance is :

a)

6 times

b)

1/16 times

c)

3 times

d)

No change

29.

Copper is a :

a)

Metal

b)

Alloys

c)

Electrolyte

d)

Semiconductor

30.

Nichrome is a :

a)

Superconductor

b)

Metal

c)

Alloy

d)

None of these

31.

Two wires 1 m and 2 m long respectively are taken , their area of cross sections are same . The resistance of :

a)

First wire be greater than that of second

b)

First wire be smaller than that of second

c)

First wire be equal to that of second wire

d)

None of these

32.

Two wires of copper , one is 0.5 m long and other is 1 m long are taken . The resistivity of first wire will be :

a)

Smaller than that of second one

b)

Greater than that of second one

c)

Equal to second wire

d)

None of these

33.

What length of a wire (resistivity 48 x $10^{-8}\Omega$ m) is required to make a resistance of 4.2 $\Omega$ (radius = 0.2 mm ):

a)

3.1 m

b)

1.1 m

c)

4.1 m

d)

5.1 m

34.

Ohm's law can be verified only if :

a)

Temperature of the conductor increases during experiment

b)

Temperature of the conductor decreases during experiment

c)

Temperature of the conductor remains the same during the experiment .

d)

A large current flows through the conductor continuously during the experiment.

35.

When two or more resistors are connected end to end consecutively , they are said to be conneted in :

a)

Series

b)

parallel

c)

Mixed grouping

d)

None of these

36.

When two or more resistor are connected between the same two points, they are said to be connected in :

a)

Series

b)

Parallel

c)

Both (a) and (b)

d)

All of these

37.

Three resistors of resistance 2 $\Omega$ ,4 $\Omega$ ,6 $\Omega$ are joined in series , the equivalent resistance of combination will be :

a)

2 $\Omega$

b)

4 $\Omega$

c)

12 $\Omega$

d)

24 $\Omega$

38.

Two resistors of 6 $\Omega$ and 12 $\Omega$ are joined in parallel the equivalent resistance will be :

a)

4 ohm

b)

9 ohm

c)

6 ohm

d)

1/4 ohm

39.

When the resistance of a circuit is to be increased , then which of the following combination of resistors should be used :

a)

Parallel combination

b)

Series combination

c)

Mixed grouping

d)

None of these

40.

When the resistance of a circuit is to be decreased , then which of the following combination of resistor should be used :

a)

Series combination

b)

Parallel combination

c)

Mixed grouping

d)

None of these

41.

If two resistors of 25 $\Omega$ and 15 $\Omega$ are joined, find in series and then in parallel with a 40 $\Omega$ resistor the effective resistance of combination is :

a)

0.1 $\Omega$

b)

20 $\Omega$

c)

10 $\Omega$

d)

40 $\Omega$

42.

The equivalent resistance of the circuit given below is :

a)

12/7 $\Omega$

b)

14 $\Omega$

c)

20/3 $\Omega$

d)

15/2 $\Omega$

43.

The wiring mostly used in domestic circuit is :

a)

Series

b)

Parallel

c)

Both (a) and (b)

d)

None of these

44.

The lamps in a household circuit are connected in parallel because :

a)

They require less current

b)

If one lamp fails the other remain lit .

c)

They require less power

d)

If one lamp fails the other remains fail.

45.

In parallel wiring in domestic circuits the net resistance of the circuit gets :

a)

Reduced

b)

Increased

c)

Remains unchanged

d)

None of these

46.

In series wiring the net resistance of the circuit :

a)

Increases

b)

Decreases

c)

Remain unchanged

d)

None of these

47.

The S.I. unit of electric power is :

a)

Watt

b)

Joule

c)

Newton

d)

None of these

48.

The rate at which electric energy is consumed is called :

a)

Electric power

b)

Electric energy

c)

Potential difference

d)

None of these

49.

1 kWh is equal to :

a)

3.6 x $10^2$ joule

b)

3.6 x $10^6$ joule

c)

3.6 x $10^5$ joule

d)

3.6 x $10^4$ joule

50.

If two identical heaters, each rated as 1000 W - 220 V are connected in parallel to 220 V , then the total power consumed is :

a)

200 W

b)

250 W

c)

2500 W

d)

2000 W

51.

When an electric lamp is connected to 12 V battery , it draws a current of 0.5 A . the power of lamp is :

a)

6 W

b)

12 W

c)

0.5 W

d)

24 W

52.

Which of the following is likely to be correct wattage for an electric iron used in our houses :

a)

60 W

b)

250 W

c)

850 W

d)

2000 W

53.

The S.I. unit of electric energy is :

a)

Calorie

b)

Joule

c)

Erg

d)

None of these

54.

If the potential difference between the ends of a fixed resistor is halved ,the electric power will become :

a)

Half

b)

one-fourth

c)

Double

d)

Three times

55.

Which of the following expressions does not represent the electric power in the circuit :

a)

VI

b)

$I^2$ /R

c)

$V^2$ /R

d)

$I^2$ R

56.

An electric fuse works on the :

a)

Magnetic effect of current

b)

Chemical effect of current

c)

Heating effect of current

d)

None of these

57.

The current passing through an electric kettle has been doubled , the heat produced will become :

a)

Half

b)

Double

c)

Four times

d)

one - fourth

[10th] ELECTRICITY

Total questions: 57

Worksheet time: 31mins

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