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7 Sci: Electric Current

Total questions: 80

Worksheet time: 47mins

Name
Class
Date
1.
Which word means how hard it is for electrons to flow?
a)
Current
b)
Voltage
c)
Resistance
d)
Power
2.
What is current measured in?
a)
Ω (Ohms)
b)
V (Volts)
c)
A (Amps)
d)
W (Watts)
3.
What is the unit of power?
a)

Ohms

b)
Volts
c)
Amps
d)

Watts

4.
To have a complete electric circuit, the path must be _____
a)
small
b)
closed
c)
big
d)
open
5.
Turning off an electric light creates a(n) _____ path
a)
open
b)
divided
c)
continuous
d)
broken
6.
The flow of electrons is counted _____ and is referred to as the _____
a)
in quantities, ampere
b)
in quantities, SI unit
c)
one by one, ampere
d)
one by one, SI unit
7.
One ampere equals about 1 _____ of electrons
a)
voltage
b)
watt
c)
ohm
d)
coulomb
8.
Within a circuit, the number of electrons flowing from a power source is _____ the number of _____ returning to the source
a)
much less than, paths
b)
the same as, electrons
c)
much less than, electrons
d)
the same as, paths
9.
When a current flows into a wire, such as a wire that connects a battery to a light, the wire stays electrically _____
a)
unbalanced
b)
charged
c)
neutral
d)
uncharged
10.
An ampere is measured in _____
a)
milliseconds
b)
seconds
c)
minutes
d)
hours
11.
An electric current flows _____ unless it is disrupted in some way
a)
continuously
b)
in spurts
c)
unevenly
d)
drop by drop
12.
The symbol for 1 _____ is A
a)
acceleration
b)
current
c)
ampere
d)
coulomb
13.
An electric current is made up of _____ charged electrons
a)
neutral
b)
negative
c)
positive
d)
balanced
14.
As current flows through a wire, the number of _____ stays the same
a)
circuits
b)
particles
c)
current
d)
electrons
15.
A lit lightbulb is an example of the _____ of electrical energy to another forms of energy
a)
movement
b)
conversion
c)
transfer
d)
fluctuation
16.
A flash of lightning is an example of an electric _____
a)
watt
b)
voltage
c)
current
d)
resistance
17.
When you turn off the TV, you stop the flow of charged _____
a)
particles
b)
amperes
c)
voltages
d)
ohms
18.
Electric _____ can travel long distances
a)
circuits
b)
currents
c)
amperes
d)
voltages
19.
The movement of electrically charged _____ is called electric _____
a)
particles, transport
b)
ions, current
c)
particles, current
d)
ions, transport
20.
Batteries and power plants are examples of ______________. 
a)
energy sources
b)
energy conduction
c)
energy transformation
21.
A complete, unbroken path that charges can flow through is called an __________________.
a)
conductor
b)
electric circuit
c)
electric current
d)
insulator
22.
The unit for the rate of current is the ______________.
a)
ampere
b)
volt
c)
ohm
d)
joule
23.
All electrical devices contain electric ________________.
a)
acid
b)
gears
c)
circuits
d)
motors
24.
Metals such as copper and aluminum are good ______________. 
a)
insulators
b)
conductors
c)
circuits
d)
charges
25.
Potential energy can be converted into _________________.
a)
food & waste
b)
water & light
c)
light & heat
d)
heat & food
26.
Which of the following does not determine the resistance of a wire?
a)
temperature
b)
color
c)
length
d)
diameter
27.
A circuit with only one path for the current to flow is a __________________.
a)
parallel circuit
b)
series circuit
c)
mini circuit
d)
device
28.
Resistance in a circuit is equal to voltage divided by ____________.
a)
joules
b)
current
c)
power 
d)
amperage
29.
Circuits often include a _____________ to control the flow of current.
a)
switch
b)
conductor
c)
voltage
d)
current
30.
The path of current in a circuit is always completed by _________________.
a)
a transformer
b)
an electrical device
c)
conducting wires
31.
When more branches are added to a parallel circuit, ____________________.
a)
resistance decreases
b)
voltage increases
c)
nothing changes
32.
_________________ found that current, voltage, and resistance are always related.
a)
Isaac Newton
b)
Albert Einstein
c)
Georg Ohm
33.
__________________ is the continuous flow of electric charges through a material.
a)
Electric current
b)
Resistance
c)
Voltage
d)
Static Discharge
34.

What is the name of this component?

a)

battery

b)

cell

c)

open switch

d)

lamp

35.

What is the name of this component?

a)

battery

b)

bell

c)

motor

d)

lamp

36.

What is the name of this component?

a)

battery

b)

cell

c)

open switch

d)

lamp

37.

What is the name of this component?

a)

fuse

b)

cell

c)

battery

d)

wire

38.

What is the name of this component?

a)

fuse

b)

cell

c)

motor

d)

lamp

39.

What is the name of this component?

a)

closed switch

b)

cell

c)

open switch

d)

wire

40.

What is the name of this component?

a)

fuse

b)

cell

c)

bell

d)

lamp

41.

What is the name of this component?

a)

fuse

b)

cell

c)

wire

d)

bell

42.

Identify this symbol.

a)

Ammeter

b)

Voltmeter

43.

Identify this symbol.

a)

Ammeter

b)

Voltmeter

c)

Resistor

44.
The actual flow of electrons is called _______.
a)
Molecule
b)
Magnetism
c)
Current
d)
Electrica
45.
Current is...
a)
moving protons
b)
moving electrons
c)
measured in volts
d)
measured in ohms
46.
What is another name for a battery in a circuit?
a)
Load
b)
Power Source
c)
Switch
47.
What is another name for a lightbulb in a circuit?
a)
Switch
b)
Load
c)
Power Source
48.

What is another name for the wires in a circuit?

a)

Conductor

b)

Load

c)

Power Source

49.

The given circuit is an example of __________ effect of electric current

a)

Magnetic effect

b)

Heating effect

c)

Chemical effect

50.

In the given pictures, Identify the gadget which doesn't use the magnetic effect of electric current

a)
b)
c)
51.

The given pictures is an example of _________ effect of electric current.

a)

Heating effect

b)

Magnetic effect

c)

None of the above

52.

In the given figures identify the appliance which doesn't use the magnetic effect of electric current

a)
b)
c)
53.

Rajan made an electromagnet by winding 50 turns of the wire over an iron screw. Priya also made an electromagnet by winding 100 turns of the wire over an iron screw. which electromagnet will attract more pins?

a)

Rajan's Electromagnet

b)

Priya's Electromagnet

c)

Both attract same number of pins

54.

The magnetic strength of a conductor decreases with the increase in current

a)

True

b)

False

c)

None of the above

55.

Which of these are features of electro magnet usually? Choose one or more options

a)

Temporary

b)

Strong

c)

Needs Electricity

d)

Weak

56.

Which of the following devices usually can break a circuit - (Choose one or more options)

a)

Switches

b)

Fuses

c)

MCBs

d)

Miniature Circuit Breakers

57.

Urvashi made a circuit and saw that some pins kept nearby were being attracted to the wires this is due to the __________ effect of electric current.

a)

Heating

b)

Gravitational

c)

Magnetic

d)

Attractive

58.

Electric Bell works on the principle of-

a)

Magnetism

b)

Electromagnetism

c)

Gravitation

d)

Static Electricity

59.

A bell only rings one time when switched on (The gong is hit only one time) because-

a)

Insufficient Electricity

b)

Electromagnet turned to or replaced by a permanent magnet

c)

Wiring Problem

d)

A mystical force

60.

Ram saw a coil of wire glowing red hot in his room heater. What is it?

a)

Glower

b)

Just a coil of wire that became very hot

c)

Element

d)

A new kind of bulb

61.

LEDs full form is-

a)

Light Era Diode

b)

Light Etern Dot

c)

Light Emitting Dot

d)

Light Emitting Diode

62.

What is the full form of MCB-

a)

Massive Circuit Breaker

b)

Massive Circuit Body

c)

Mighty Circuit Breaker

d)

Miniature Circuit Breaker

63.

Why people prefer to put an MCB in their house instead of fuse nowadays- (Choose one or more options)

a)

They are cheap.

b)

Fuses need to be changed every time they blow out.

c)

MCBs can be controlled manually.

d)

Fuses are expensive.

64.

Which mark is necessary on electric appliances?

a)

AGMARK

b)

ISI

c)

FICCI

d)

KSK

65.

If a positive terminal of one cell is connected to the negative terminal of the next cell it is known as

a)

Electric current

b)

Fuse

c)

Battery

d)

Element

66.

Which mark is necessary on electric appliances?

a)

AGMARK

b)

ISI

c)

FICCI

d)

KSK

67.

If a positive terminal of one cell is connected to the negative terminal of the next cell it is known as

a)

Electric current

b)

Fuse

c)

Battery

d)

Element

68.

Which of these following cannot be harmed by electric current

a)

Plastic

b)

Rubber

c)

A & B

d)

All of the above

69.

Refer the diagram. A wire carries a current, creating a magnetic field around itself as shown. The current in the wire is:

a)

Directed to the right

b)

Directed to the left

c)

Equal to the magnetic field

d)

n the same direction as the magnetic field

70.

An Electric charge in a uniform motion produces

a)

An Electric Field only

b)

An Magnetic field only

c)

Both Electric Field & Magnetic field

d)

Neither of them

71.

A wire is parallel to the lines of the force of the magnetic field and the current flows in the wire. Then

a)

The wire will experience a force along the direction of the magnetic field

b)

The wire will not experience any force

c)

The wire will experience the torque

d)

The wire will experience a perpendicular force

72.

Who was the first to observe the magnetic effect of electric current?

a)

Faraday

b)

Oersted

c)

Volta

d)

Ampere

73.

Identify the poles of the magnet in the given figure.

a)

NORTH

b)

SOUTH

c)

One is north and the other is south

d)

Can't predict

74.

Which of the following diagrams correctly shows the magnetic field produced by a current- carrying wire?

a)

A

b)

B

c)

C

d)

D

75.

A device used to measure the amount of electric current flowing through a circuit.

a)

Ammeter

b)

Voltmeter

c)

Resistor

d)

Battery

76.

Current flows through the circuit when the circuit is in the _________________condition.

a)

Broken

b)

Open

c)

Closed

d)

Incomplete

77.

The magnetic field around a current carrying coil

a)

Lasts for three hours

b)

Lasts as long as current flows through it

c)

Lasts till its half-life period

d)

Is permanent

78.

A fuse wire is made up of alloy

a)

Nichrome

b)

Tin-lead

c)

Manganin

d)

Constantan

79.

Copper wires are used as connecting wires because

a)

Copper has very high melting point

b)

Copper wires are very thick wires

c)

Copper wires offer a lower resistance

d)

None of these

80.

The device used to make or break an electric circuit is

a)

Resistor

b)

Battery

c)

Switch

d)

Ammeter

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