# Olympiad Test: Electric Current & its Effects

## 20 Questions MCQ Test Online MCQ Tests for Class 7 | Olympiad Test: Electric Current & its Effects

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Attempt Olympiad Test: Electric Current & its Effects | 20 questions in 20 minutes | Mock test for UPSC preparation | Free important questions MCQ to study Online MCQ Tests for Class 7 for UPSC Exam | Download free PDF with solutions
QUESTION: 1

### A ____________ is used in torches.

Solution:

A dry cell is used in torches and other devices that are mobile.

QUESTION: 2

### MCB in electric circuit stand for

Solution:

MCB is electric circuit stands for miniature circuit breaker used to break circuit in case of excess of current.

QUESTION: 3

### Electromagnet is used in

Solution:

Electromagnet is used in electric bell. When switch is closed the, current flows and electric bell works.

QUESTION: 4

Electric current is measured by a device

Solution:

Electric current is measured by a device called ammeter. It is always connected in series in circuit.

QUESTION: 5

Fuse wire is made up of alloys of

Solution:

Fuse wire is made up of alloys of low melting point that melts if higher current flows through the circuit.

QUESTION: 6

Coils of heating devices are made up of

Solution:

The coils of heating devices are made up of Nichrome, which is an alloy having very high resistance and high melting point.

QUESTION: 7

Wire carrying current produce attracts the magnetic material due to

Solution:

Wire carrying current produce attracts the magnetic material due to magnetic field.

QUESTION: 8

A material having very high resistance is called

Solution:

A material having very high resistance is called an insulator.

QUESTION: 9

Potential difference is created in a electric circuit due to

Solution:

Potential difference is created in an electric circuit due to cell or battery.

QUESTION: 10

Heating effect of electric current is used in

Solution:

Heating effect of electric current is used in bread toaster having coils of high resistance and melting point.

QUESTION: 11

Fuse wire is used in electric circuit to prevent

Solution:

Fuse is a safety device that is used in electric circuit to prevent electrical appliances and circuit in case of very high current.

QUESTION: 12

The metal which is poor conductor of electricity is

Solution:

All metals are good conductor of electricity but mercury is poor conductor of electricity.

QUESTION: 13

A device that break the electric circuit in case of excess current is called

Solution:

A device that breaks the electric circuit in case of excess of current is called fuse wire.

QUESTION: 14

Which of the following metal is best conductor of electric current?

Solution:

Silver metal is best conductor of electric current out of all metals due to very high resistivity.

QUESTION: 15

A device that converts the electrical energy into heat energy is

Solution:

Heater is a device that converts the electric energy into heat energy.

QUESTION: 16

Nichrome is used a coil of heater because

Solution:

Nichrome is used in coil of heater because it has high resistance and high melting point.

QUESTION: 17

Combination of two or more cell in series is called

Solution:

Combination of two or more cell in series is called battery. Battery creates potential difference to flow current.

QUESTION: 18

Closed and continuous path of electric current is called

Solution:

Closed and continuous path of electric current is called electric circuit.

QUESTION: 19

Coming together of live wire and fuse wire in a circuit is called

Solution:

When live wire and neutral wire of a circuit come together, short circuit occurs to increase the temperature of circuit.

QUESTION: 20

In electrical wiring, the wire with black insulation is usually

Solution:

In electrical wiring, the wire with black insulation is usually neutral wire and red insulation with live wire.

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