Electric Current and its Effects Test

Result

Electric Current and its Effects Test - 4

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Weekly Quiz Competition

Question 1
1 / -0

The main function of a switch is to

A
Allow charges of flow

B
Complete or break a circuit

C
Make the bulb glow easily

D
Prevent electric shocks

Solution

A switch is a device that is used for making and breaking electric current in a circuit. It is used to turn on and turn off daily used equipment like television, washing machine, fan, light, etc.
Question 2
1 / -0

MCB stands for:

A
Main circuit board

B
Master code bill

C
Miniature circuit breaker

D
None of these

Solution

MCB stands for Miniature circuit breaker.
Question 3
1 / -0

What material is used for making the armature of an electric bell ? Give a reason for using this material.

A
Soft Iron

B
Carbon

C
Glass

D
Silicon

Solution

Soft iron is used for making the armature of an electric bell because we don't want the armature to retain its magnetism when the current is withdrawn.
Soft iron is magnetised easily on passing the current and completely demagnetised easily on withdrawing the current through the solenoid.
Question 4
1 / -0

The magnetic effect of electric current is used in a/an :

A
electric motor

B
geyser

C
electromagnet

D
electric bulb
Question 5
1 / -0

An electric iron is based upon the principle of:

A
Heating effect of current

B
Magnetic effect of current

C
Chemical effect of current

D
None of these

Solution

An electric iron is based on the principle of the heating effect of current.
When an electric current passes through a conductor (like a high resistance wire) the conductor becomes hot after some time and produces heat. This is called the heating effect of current.
Question 6
1 / -0

Many devices such as.............. use batteries.

A
Torches

B
Transistors, toys

C
T.V. remote controls

D
All of these

Solution

Torches
Transistors, toys
T.V remote controls

All of these use batteries.
Question 7
1 / -0

The circuit breaker device which can be used in place of a fuse is called

A
CBD

B
MCB

C
MCD

D
CBF

Solution

Answer is B.

Fuse boxes contain safety devices called fuses or circuit breakers - MCB (Miniature Circuit Breaker) which are designed to prevent an excess of electric current entering your house by only allowing a certain maximum current to flow in. When the electrical current is too large, an electromagnet attracts a spring loaded switch which breaks the circuit and cuts the power supply. The switch must be reset before any current can flow again.
Question 8
1 / -0

Which device is voltmeter?

A

B

C

D

Solution

(a) : Ammeter
(b) : Galvanometer
(c) : Voltmeter
(d) : Bulb
Hence option $$C$$ is correct.
Question 9
1 / -0

Symbol of open switch is:

A

B

C

D

Solution

(a) Closed switch
(b) Single-cell
(c) Open switch
(d) Voltmeter
Question 10
1 / -0

Is the symbol for

A
Ammeter

B
Load

C
Voltmeter

D
None

Solution

The symbol shown in the figure represents a switch.It is used to turn off or turn on the circuit.Thus option D is correct.