Free Printable CH-12 ELECTRICITY

1.

Will this circuit light the bulb?

a)

Yes

b)

No

2.

Two unequal resistances are connected in parallel.

Which of the following statement is true

a)

current in same in both

b)

current is larger in higher resistance

c)

voltage-drop is same across both

d)

voltage-drop is lower in lower resistance

3.

You are given n identical wires, each of resistance R.

When these are connected in parallel, the equivalent

resistance is X. When these will be connected in series,

then the equivalent resistance will be

a)

Xn²

b)

Xn

c)

nX

d)

X/n

4.

A wire of resistance 20 ohm is bent in form of a circle. Find the equivalent resistance between two diametrically opposite ends

a)

40 ohm

b)

20 ohm

c)

10 ohm

d)

5 ohm

5.

An example of a voltage source is a _____.

a)

voltmeter

b)

battery

c)

resistance

d)

switch

6.

A bird perches on a power line that carries current of 160 A . calculate the potential difference between the bird's feet if the resistance of wire is

10\mu\Omega m^{-1}

and the birds feet are 4 cm apart

a)

$1.6\times10^{-5^{ }}$ volt

b)

$6.4\times10^{-5}$ volt

c)

$3.2\times10^{-5}$ volt

d)

$9.6\times10^{-5}$ volt

7.

calculate current through 6 ohm resistor

a)

0.12

b)

0.44

c)

0.51

d)

4.6

8.

two wires A and B of equal masses and of the same material are taken .the lenght of the wire A is half the lenght of wire B . if the resistance of the wire A is 24 ohm , the resistances of wire B will be

a)

96 ohm

b)

12 ohm

c)

48 ohm

d)

4 ohm

9.

resistivity of a metal depends on

a)

lenght

b)

area of cross section

c)

all of the above

d)

none of the above

10.

resistance of alloys decreases with increase in temprature

a)

true

b)

false

11.

Which of the following represents voltage?

a)

$work\ done\div current\ \times time$

b)

$work\ done\ \times ch\arg e$

c)

work done $\times ch\arg e\ \times$ time

d)

none of the above

12.

What charge does an electron have?

a)

negative (-)

b)

positive (+)

c)

neutral or no charge (0)

d)

both positive and negative

13.

What kind of circuit is this?

a)

series

b)

parallel

c)

double circuit

d)

serious

14.

this circuit is .....?

a)

open, series

b)

open, parallel

c)

closed, series

d)

closed, parallel

15.

The current flowing in an electric circuit can be increased by:

a)

increasing voltage or decreasing resistance.

b)

decreasing voltage or increasing resistance.

c)

increasing voltage and increasing resistance.

d)

decreasing voltage and decreasing resistance.

16.

A path through which electricity flows

a)

battery terminal

b)

open circuit

c)

circuit

d)

series circuit

17.

A circuit in which an electrical current cannot flow through.

a)

open circuit

b)

closed circuit

c)

volt

d)

parallel circuit

18.

what is this symbol for?

a)

light bulb

b)

switch

c)

battery

d)

resistor

19.

What is the resistance, if the voltage is 9 V and the Current is 3 Amps?

a)

.33

b)

27

c)

6

d)

3

20.

What is resistance measured in?

a)

Ω (Ohms)

b)

V (Volts)

c)

A (Amps)

d)

W (Watts)

21.

When the length of a wire increases by 5 times, the resistance of the wire will

a)

also increase by 5 times

b)

decrease by 5 times

c)

remain the same

d)

None of the above

22.

which formula/formulae below can be used to calculate electrical power?

a)

$Power\ =\ voltage\ \times current$

b)

$Power\ =\ \frac{voltage^2}{resis\tan ce}$

c)

$Power\ =\ current^2\ \times resis\tan ce$

d)

$power\ =\ \frac{voltage}{current}$

23.

What does the Voltage vs Current graph for an Ohmic component look like?

a)

A curved graph

b)

A horizontal line

c)

A linear graph

d)

A vertical line

24.

Which type of circuit is used in our homes and allows components to be turned on and off independently?

a)

Series

b)

Parallel

c)

Both a and b

d)

Neither a or b

25.

Which of these represents a Battery?

a)

b)

c)

d)

26.

Thicker wires have _______ resistance than thinner wires.

a)

more

b)

less

c)

the same

27.

Which formulas represents Ohm's law?

a)

V=IR

b)

R=IV

c)

I=RV

28.

What type of circuit is pictured?

a)

series

b)

Parallel

29.

What type of circuit is pictured?

a)

series

b)

parallel

30.

Which of the following is the SI unit for electric current?

a)

Ohm

b)

Watt

c)

Ampere

d)

Volt

31.

An electric kettle is commonly used to heat up water at home. The heating element used is nichrome wire and not copper. Which of the following reasons best explains why nichrome is used instead of copper?

a)

Nichrome conducts more current than copper, so more heat can be generated.

b)

Nichrome has higher resistance than copper, so more heat can be generated.

c)

Nichrome has higher voltage than copper, so more heat can be generated.

d)

Nichrome are cheaper than copper, so it is more economical.

32.

Which of the following materials is used in a light bulb to produce heat and light?

a)

Nichrome

b)

Copper

c)

Tungsten

d)

Steel

33.

A higher resistance in a circuit causes a _____________.

a)

higher voltage

b)

larger current

c)

smaller current

d)

lower voltage

34.

The instrument that measures electric current is called ___________.

a)

a resistor

b)

a voltmeter

c)

an ammeter

d)

an electrometer

35.

What does the W stand for on the ohm's law wheel?

a)

amps

b)

volts

c)

watts

d)

ohms

36.

What 1 kW is equivalent to __________ watts?

a)

100 W

b)

1,000 W

c)

10,000 W

d)

10 W

37.

What is the wattage rating of a 240 volt, 6 amp device?

a)

1.44

b)

14.4

c)

144

d)

1440

38.

Power is measured in what unit?

a)

amps

b)

volts

c)

watts

d)

ohms

39.

if resistance of a circuit is tripled, and the voltage stays the same, the current will_

a)

double

b)

decrease by one third

c)

triple as will

d)

not change

40.

Potential difference is another term for

a)

current

b)

voltage

c)

energy

d)

watts

41.

what is the power of a lamp whose current is 6 A and the voltage across it is 120 V?

a)

120 W

b)

720 W

c)

16 W

d)

10 W

42.

Which formulas represents Ohm's law?

a)

V=IR

b)

R=IV

c)

I=RV

43.

A student carries out an experiment and plots the V-I graph of three samples of nichrome wire with resistances R1 R2 and R3 respectively. Which of the following is high ?

a)

R1 = R2 = R3

b)

R1 > R2 > R3

c)

R3 > R2 > R1

d)

none of these

44.

Calculate the current flows through the 10 Ω resistor in the following circuit.

a)

1.2 A

b)

0.6 A

c)

0.2 A

d)

2.0 A

45.

A cell, a resistor, a key and ammeter are arranged as shown in the circuit diagrams of Figure (i), (ii) and (iii). The current recorded in the ammeter will be

a)

maximum in (i)

b)

maximum in (ii)

c)

maximum in (iii)

d)

will be same in all the cases

46.

Coulomb is the SI unit of:

a)

charge

b)

current

c)

resistance

d)

potential difference

47.

Three resistors of 1 Ω, 2 ft and 3 Ω are connected in parallel. The combined resistance of the three resistors should be

a)

greater than 3 Ω

b)

less than 1 Ω

c)

equal to 2 Ω

d)

zero

48.

What is the commercial unit of electrical energy?

a)

Joules

b)

Kilojoules

c)

Kilowatt-hour

d)

watt-hour

49.

Electrical resistivity of any given metallic wire depends upon

a)

its thickness

b)

its shape

c)

nature of the material

d)

its length

50.

The rate of electric energy loss in a thermal device due to resistance R is given by:

A. P = I²/R

B. P = V²/R

C. P = I²/V

D. P = V/I

a)

A and B

b)

B and C

c)

A and D

d)

A and C

51.

Is the circuit pictured complete or incomplete?

a)

Complete

b)

Incomplete

52.

The resistance whose V-I graph is given below is

a)

a

b)

b

c)

c

d)

d

53.

what does the image represent

a)

open circuits

b)

don't touch

c)

acidic materials

d)

electric hazard

54.

The SI unit of resistivity is

a)

mho-meter

b)

ohm meter

c)

millimeter

d)

ammeter

55.

An electric bulb is rated 220V and 100W.When it is operated on 110V.The power consumed will be

a)

100W

b)

75W

c)

50W

d)

25W

56.

According to Ohm's Law, the potential difference across the ends of a resistor is directly proportional to the ……… through it, provided its ............ remains constant.

a)

current, temperature

b)

temperature, current

c)

physical condition, temperature

d)

physical condition, current

57.

Electric power is inversely proportional to

a)

voltage

b)

current

c)

temperature

d)

resistance

58.

Electrical resistivity of any given metallic wire depends upon

a)

nature of the material

b)

its thickness

c)

its shape

d)

its length

59.

An electric bulb is connected to a 220V generator. The current is 0.50 A. What is the power of the bulb?

a)

0.0023 W

b)

55 W

c)

110 W

d)

440 W

60.

Circuits often include a _____________ to control the flow of current.

a)

switch

b)

conductor

c)

voltage

d)

current

61.

Quantity of charge can be measured in

a)

time (s)

b)

Ampere (A)

c)

coulombs (C)

d)

Joule (J)

62.

Which equation can be rearranged to calculate the the electric current given?

a)

I = Q ÷ t

b)

Q = It

c)

I = Qt

d)

I = t ÷Q

63.

Electric potential is measured by

a)

Voltmeter

b)

Ammeter

c)

Electroscope

d)

Galvanometer

64.

Formula to find electric potential is

a)

V=QA

b)

V=WQ

c)

V=Q/W

d)

V=W/Q

65.

How many electron constitutet 1C charge

a)

6.25x10^-18

b)

6.25x10¹⁸

c)

1.6x10^-19

d)

1.6x10¹⁹

66.

Ohm's Law states that:

a)

Current = Voltage x Resistance

b)

Resistance = Voltage x Current

c)

Power = Voltage x Current

d)

Voltage = Current x Resistance

67.

According to Ohm's Law, if you were to triple the voltage of a circuit without changing the resistance, what would happen to the flow of current?

a)

It would stay the same

b)

It would increase by 2x

c)

It would increase by 3x

d)

It would decrease by 3x

68.

Factor which does not affect the resistance

a)

Type of material

b)

Length of material

c)

Mass of the material

d)

Area of the material

69.

What is this symbol?

a)

resistor

b)

switch

c)

battery

d)

bulb

70.

A wire has a resistance R.

What is the resistance when both the length and radius of the wire are doubled?

a)

R/4

b)

R/2

c)

2R

d)

4R

71.

Resistivity of a metal depends on

a)

lenght

b)

area of cross section

c)

all of the above

d)

none of the above

72.

When the wire of an electric circuit is stretched to double its length, its resistance will be ……

a)

Doubled

b)

Decreased to half

c)

Increased four times

d)

Remains constant

73.

The unit Coulomb / Ampere represents a quantity of ………………………

a)

Time

b)

Charge

c)

Intensity of current

d)

Resistance

74.

This is the symbol for a _____?

a)

switch

b)

Light

c)

Battery

d)

Wires

75.

What is one problem with using a series circuit?

a)

It has a lot of series.

b)

If one goes down, they all go down!

c)

It doesn't work properly.

d)

It uses high voltage.

76.

What effect do like (similar) charges have on each other?

a)

They attract

b)

They repel

c)

No effect

d)

They reverse each other

77.

A wire of length l, made of material resistivity ρ is cut into two equal parts. The resistivity of the two parts are equal to,

a)

$\rho$

b)

$\frac{\rho}{2}$

c)

$2\rho$

d)

$4\rho$

78.

A battery of 10 volt carries 20,000 C of charge through a resistance of 20 Ω. The work done in 10 seconds is:

a)

$2\times10^{5\ }J$

b)

$2\times10^{3\ }J$

c)

$2\times10^{2\ }J$

d)

$2\times10^{4\ }J$

79.

A boy records that 4000 joule of work is required to transfer 10 coulomb of charge between two points of a resistor of 50 Ω. The current passing through it is:

a)

2 A

b)

8 A

c)

4 A

d)

16 A

80.

Two devices are connected between two points say A and B in parallel. The physical quantity that will remain the same between the two points is:

a)

CURRENT

b)

RESISTANCE

c)

VOLTAGE

d)

NONE OF THESE

CH-12 ELECTRICITY

Total questions: 80

Worksheet time: 1hrs 1mins

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