Free Printable Electricity

1.

SI unit of current is,

a)

coulombs

b)

volt

c)

joules

d)

ampere

2.

$\mu A$ and $mA$ refer to following value

a)

$10^{-3\ }\ and\ 10^{-6}$

b)

$10^{-6\ }\ and\ 10^{-9}$

c)

$10^{-6}\ and\ 10^{-3}$

d)

$10^{-3}\ and\ 10^{-9}$

3.

Work done in moving 10 C of charge across a potential difference of 5 V is,

a)

50 J

b)

2 J

c)

0.5 J

d)

25 J

4.

You are given three resistance of 3 ohms each. If you connect them in "parallel" to each other then resultant resistance will be,

a)

1 ohm

b)

3 ohms

c)

6 ohms

d)

9 ohms

5.

SI unit of resistivity is

a)

$\Omega m$

b)

$\frac{\Omega}{m}$

c)

$\frac{m}{\Omega}$

d)

$\Omega$

6.

Resistivity of an wire depends on

a)

Length And temperature

b)

Area of cross-section and temperature

c)

Length and Area of cross section

d)

Only temperature

7.

If length of an wire is halved and area of cross-section is doubled, then the "resistivity" of the material will be,

a)

Doubled

b)

Halved

c)

1/4 of previous value

d)

No change as it does not depend on length or area of cross section

8.

Direction of flow of electrons is from,

a)

Positive to Negative terminal

b)

Negative to Positive terminal

c)

Electrons do not move

9.

One ampere is constituted by the flow of_____________ of charge per second

a)

one volt

b)

one watt

c)

one Joule

d)

one coulomb

10.

Which of this is formula for Potential difference

a)

W/I

b)

Q/W

c)

W/It

d)

V/q

11.

Resistance of a given wire

a)

Inversely proportional to area of cross section of wire

b)

Directly proportional to length of wire

c)

Depends on temperature

d)

Depends on type of material

e)

All of above

12.

Resistivity of material does not depend on temperature.

a)

True

b)

False

13.

Ammeter and Voltmeter in a circuit is connected respectively as

a)

Both in series

b)

Both in parallel

c)

Series and parallel

d)

Parallel and series

14.

V = IR can also be represented as, (ρ = resistivity, I = length , Q = charge, A = Area of cross section, t = time)

a)

$V=\frac{Ql}{At}$

b)

$V=\frac{Qρl}{At}$

c)

$V=\frac{At}{Qρl}$

d)

$V=\frac{At}{Ql}$

15.

Resistance remains constant when both length and area of cross section of wire are doubled.

a)

True

b)

False

16.

Resistivity of a material is reduced to half its original value if area of cross section of wire is doubled keeping the length same.

a)

True

b)

False

17.

A device that helps maintain potential difference across a conductor is,

a)

Voltmeter

b)

Ammeter

c)

Resistance

d)

Cell or battery

18.

A current of 4 Amperes flows in a circuit at power of 12 watts. What is potential difference across the circuit?

a)

3 V

b)

4 V

c)

5 V

d)

6 V

19.

From Joules law of heating we can deduce that,

Heat produced in a resistor is

(i) directly proportional to the current for a given resistance,

(ii) directly proportional to square of resistance for a given current, and

(iii) directly proportional to the time for which the current flows through the resistor.

a)

(i) and (ii) are correct

b)

(i) and (iii) are correct

c)

Only (iii) is correct

d)

(i), (ii) and (iii) are correct

20.

300 J of heat is produced each second in a 3 Ω resistance. Find the potential difference across the resistor.

a)

900 V

b)

300 V

c)

90 V

d)

30 V

21.

An induction stove rated 500 W operates 5 hour/day. The cost of the energy to operate it for 30 days at Rs 5.00 per kWh will be

a)

Rs. 365

b)

Rs. 357

c)

Rs. 375

d)

Rs. 307

22.

Three resistance are connected in parallel,

R1 = 20 ohms

R2 = 10 ohms

R3 = 5 ohms

V = 20 volts

Current through the circuit will be

a)

20 A

b)

7 A

c)

25 A

d)

14 A

23.

The region surrounding a magnet, in which the force of the magnet can be detected, is said to have a______________

a)

Electric Current

b)

Electric Field

c)

Magnetic Field

24.

The lines along which the iron filings align themselves represent around a magnet represent

a)

Direction of electric current

b)

Magnetic field lines

c)

Electric field lines

25.

1) Magnetic Field lines are closed curves

2) Outside the magnet they point from South to North and inside North to South.

3) Strength of the magnetic field is shown by the degree of closeness of the field lines.

4) No two field-lines are found to cross each other.

a)

Only 1,2 and 4 are correct

b)

Only 1,3 and 4 are correct

c)

Only 3 and 4 are correct

d)

All statements are correct

26.

1) Magnetic Field lines are closed curves

2) Outside the magnet they point from South to North and inside North to South.

3) Strength of the magnetic field is shown by the degree of closeness of the field lines.

4) No two field-lines are found to cross each other.

a)

Only 1,2 and 4 are correct

b)

Only 1,3 and 4 are correct

c)

Only 3 and 4 are correct

d)

All statements are correct

27.

One volt is the potential difference between two points in a current carrying conductor when _________________ of work is done to move a charge of 1 coulomb from one

point to the other.

a)

1 Watt

b)

1 joule

c)

1 Ampere

d)

1 kWh

28.

The potential difference, V, across the ends of

a given metallic wire in an electric circuit is directly

proportional to the current flowing through it, provided its __________________ remains the same. This is called Ohm’s law.

a)

Current

b)

Voltage

c)

Power

d)

Temperature

29.

If the potential difference across the two ends of a conductor is 1 V and the current through it is 1 A, then the resistance R, of the conductor is 1 Ω.

Is the above statement for 1 ohm correct?

a)

Yes

b)

No

30.

In an electric circuit, a device called ___________ is often used to change the resistance in the circuit.

a)

Rheostat

b)

Voltmeter

c)

Ammeter

d)

Battery

31.

It is observed that the ammeter reading decreases to one-half when the length of the wire is _____________.

a)

Halved

b)

doubled

c)

Tripled

32.

Resistivity of an conductor is of order

a)

$10^{-8\ }\ m\ to\ 10^{-6\ }\ m$

b)

$10^{8\ }\ \Omega m\ to\ 10^{6\ }\ \Omega m$

c)

$10^{-8\ }\ \Omega m\ to\ 10^{-6\ }\ \Omega m$

d)

$10^{12\ }\ \Omega m\ to\ 10^{17\ }\ \Omega m$

33.

The potential difference between the terminals of an electric heater is 60 V when it draws a current of 4 A from the source. What current will the heater draw if the potential difference is increased to 120 V?

a)

8A

b)

16A

c)

20A

d)

15A

34.

A wire of given material having length l and area of cross-section A has a resistance of 4 Ω. What would be the resistance of another wire of the same material having length l/2 and area of cross-section 2A?

a)

4 Ω

b)

3 Ω

c)

2 Ω

d)

1 Ω

35.

In series combination ___________ remains constant across resistors

a)

Current

b)

Potential Difference

36.

In Parallel combination ___________ remains constant across resistors

a)

Current

b)

Potential Difference

37.

100 J of heat is produced each second in a 4 Ω resistance.

Potential difference across the resistor is

a)

5V

b)

10V

c)

15V

d)

20V

38.

_____________protects circuits and appliances by stopping the flow of any unduly high electric current.

a)

Resistance

b)

Wire

c)

Fuse

d)

Battery

39.

One watt hour is the energy consumed when ___________________ of power is used for 1 hour.

a)

1 kilo-watt

b)

1 watt

c)

1 kilojoule

d)

1 joule

40.

The commercial unit of electric energy

is _____________________, commonly known as ‘unit’.

a)

watt hour (W h)

b)

watt-second (Ws)

c)

kilowatt hour (kW h)

d)

kilowatt second (kW s)

41.

Which of the following terms does not represent electrical power in a circuit?

a)

$I^2R$

b)

$IR^2$

c)

$VI$

d)

$\frac{V^2}{R}$

42.

A wire of resistance 10 ohm is bent in the form of a closed

circle. What is the resistance between two points at

the ends of any diameter of the circle?

a)

0.4 ohms

b)

1.5 ohms

c)

1.4 ohms

d)

2.5 ohms

43.

Which of these materials is a good insulator?

a)

gold

b)

copper

c)

silver

d)

plastic

44.

This is the symbol for a...

a)

Motor

b)

Ammeter

c)

Bulb

d)

Voltmeter

45.

This is the symbol for a...

a)

Battery

b)

Cell

c)

Fixed Resistor

d)

Variable Resistor

46.

When unequal resistors are connected in parallel in a circuit,

a)

the same current always runs through each resistor.

b)

the potential drop is always the same across each resistor.

c)

the largest resistance has the largest current through it.

d)

the power generated in each resistor is the same.

47.

The circuit diagram shows a 4.0 Ω resistor and an 8.0 Ω resistor connected to a 6.0V battery. What is the current in the battery?

a)

0.50A

b)

0.75A

c)

1.50A

d)

2.00A

48.

The circuit diagram shows a 4.0 Ω resistor and an 8.0 Ω resistor connected to a 6.0V battery.What is the current in the 8.0 Ωresistor?

a)

0 A

b)

0.50A

c)

0.75A

d)

1.0A

49.

A 30 Ω resistor is connected in series with another resistor and a 6.0 V battery. The current in the circuit is 0.12 A. A voltmeter is connected across the other resistor. What is the reading on the voltmeter?

a)

2.4 V

b)

3.6 V

c)

6.0 V

d)

9.6 V

50.

Which one of the following resistors connected in parallel with a 24 Ω would give a total resistance of 8 Ω

a)

16 Ω

b)

12 Ω

c)

8 Ω

d)

6 Ω

Electricity

Total questions: 50

Worksheet time: 47mins

Similar Resources on Wayground