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Important Questions Test: Electric Current & its Effects


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20 Questions MCQ Test Science Class 7 | Important Questions Test: Electric Current & its Effects

Important Questions Test: Electric Current & its Effects for Class 7 2023 is part of Science Class 7 preparation. The Important Questions Test: Electric Current & its Effects questions and answers have been prepared according to the Class 7 exam syllabus.The Important Questions Test: Electric Current & its Effects MCQs are made for Class 7 2023 Exam. Find important definitions, questions, notes, meanings, examples, exercises, MCQs and online tests for Important Questions Test: Electric Current & its Effects below.
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Important Questions Test: Electric Current & its Effects - Question 1

A battery consists of

Detailed Solution for Important Questions Test: Electric Current & its Effects - Question 1

A battery consists of some number of voltaic cells. Each cell consists of two half-cells connected in series by a conductive electrolyte containing metal cations.

Important Questions Test: Electric Current & its Effects - Question 2

Select the one in which heating effect of current is not used.

Detailed Solution for Important Questions Test: Electric Current & its Effects - Question 2

The chemical reactions in the battery causes a build up of electrons at the anode.

Important Questions Test: Electric Current & its Effects - Question 3

When an electric current is flowing through a conductor it

Detailed Solution for Important Questions Test: Electric Current & its Effects - Question 3

Experiences a force when it is in a magnetic field

Important Questions Test: Electric Current & its Effects - Question 4

The magnetic field around a current-carrying coil lasts

Detailed Solution for Important Questions Test: Electric Current & its Effects - Question 4

for the duration for which current flows through it

Important Questions Test: Electric Current & its Effects - Question 5

When electric current flows through a conductor, the conductor becomes

Detailed Solution for Important Questions Test: Electric Current & its Effects - Question 5

When an electric current flows through a conductor, it becomes hot because,the resistance of the conductor blocks the electricity flow.

Important Questions Test: Electric Current & its Effects - Question 6

By whom was magnetic effect of current discovered?

Detailed Solution for Important Questions Test: Electric Current & its Effects - Question 6

The magnetic effect of current was discovered by H.C. Oersted. 

Important Questions Test: Electric Current & its Effects - Question 7

A fuse is fixed in a circuit in order to

Detailed Solution for Important Questions Test: Electric Current & its Effects - Question 7

It acts as safeguard against excessive current. When the current exceeds certain limit the fuse wire gets broken and so it acts as a safeguard.

Important Questions Test: Electric Current & its Effects - Question 8

Select the one that you will prefer to make an electromagnet.

Detailed Solution for Important Questions Test: Electric Current & its Effects - Question 8

The soft iron inside the coil makes the magnetic field stronger because it becomes a magnet itself when the current is flowing. Soft iron is used because it loses its magnetism as soon as the current stops flowing. Soft iron is said to form a temporary magnet. In this way, the electromagnet can be switched on and off by turning the electricity on and off.

Important Questions Test: Electric Current & its Effects - Question 9

Tungsten is used for the manufacture of an electric bulb because

Detailed Solution for Important Questions Test: Electric Current & its Effects - Question 9

The metal tungsten is used for the filaments in incandescent bulbs. It has a high melting point and retains its strength when heated. The tungsten's resistance makes it glow white-hot, and inert gases (mostly nitrogen) in the bulbs keep the tungsten from oxidizing.

Important Questions Test: Electric Current & its Effects - Question 10

In an electric motor, conversion takes place of

Detailed Solution for Important Questions Test: Electric Current & its Effects - Question 10

electrical energy into mechanical energy

Important Questions Test: Electric Current & its Effects - Question 11

Key or switch in circuit is placed:

Detailed Solution for Important Questions Test: Electric Current & its Effects - Question 11

The key or switch can be placed anywhere in the circuit. When the switch is in the 'ON' position, the circuit from the positive terminal of the battery to the negative terminal is complete.

Important Questions Test: Electric Current & its Effects - Question 12

In which circuit will the bulb or bulbs glow the brightest?

Detailed Solution for Important Questions Test: Electric Current & its Effects - Question 12

The chemical energy stored in two cells is more than one. The electrical energy used by one bulb is less than the energy used by two bulbs. So the bulb in the circuit that has one bulb and two cells will glow the brightest.

Important Questions Test: Electric Current & its Effects - Question 13

Which of the following instruments is used to check whether electricity is flowing through a substance or not?

Detailed Solution for Important Questions Test: Electric Current & its Effects - Question 13

Tester is used to check whether electricity is flowing through a substance.

Important Questions Test: Electric Current & its Effects - Question 14

Why are symbols used for electronic components?

Detailed Solution for Important Questions Test: Electric Current & its Effects - Question 14

It makes it easier to draw the circuit diagrams

Important Questions Test: Electric Current & its Effects - Question 15

The acting contacts for circuit breakers are made of

Detailed Solution for Important Questions Test: Electric Current & its Effects - Question 15

Copper tungsten materials are often used for arcing contacts in medium to high voltage sulfur circuit breakers in environments that can reach temperatures above 20,000K.

Important Questions Test: Electric Current & its Effects - Question 16

The primary cell which is used in daily life is

Detailed Solution for Important Questions Test: Electric Current & its Effects - Question 16

Dry cells are more durable, they are typically used for remote controls, flashlights and other similar handheld devices.

Important Questions Test: Electric Current & its Effects - Question 17

Electric current is measured by a device called

Detailed Solution for Important Questions Test: Electric Current & its Effects - Question 17

An ammeter is an instrument used for measuring electric current in units of amperes. An ammeter must be connected in series with the path of the current being measured.

Important Questions Test: Electric Current & its Effects - Question 18

When electricity is passed through a coil

Detailed Solution for Important Questions Test: Electric Current & its Effects - Question 18

When an electric current is passed through the wire of the coil to generate a magnetic field, or conversely an external time-varying magnetic field through the interior of the coil generator and energy is also lost in the form of heat.

Important Questions Test: Electric Current & its Effects - Question 19

Study of relationship between electricity and magnetism is called

Detailed Solution for Important Questions Test: Electric Current & its Effects - Question 19

Electromagnetism is a branch of Physics, deals with the electromagnetic force that occurs between electrically charged particles.

Important Questions Test: Electric Current & its Effects - Question 20

What is the material for electric fuse?

Detailed Solution for Important Questions Test: Electric Current & its Effects - Question 20

The material mainly used for fuse element are tin, lead, silver, copper, zinc and alloy of lead and tin. An alloy of lead and tin is used for small current rating fuses

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