Match the following Column A Column B (a). Human body (1). electric bell (b). Silk thread (2). current (c). Charge in motion (3). conductor (d). Soft iron (4). electromagnet (e). Electromagnet (5). insulator

(a). Human body (3). conductor Human body is a conductor of electric current. Conductors are the materials which allows the electric current to pass through them. (b). Silk thread (5). insulator Silk thread is an insulator. There are no free electrons are there in the silk thread. Hence, it does not conduct electricity. (c). Charge in motion (2). current Charge in motion is called current. In metals the flow of electrons is called current. Its SI unit is ampere. (d). Soft iron (4). electromagnet The core of an electromagnet is a soft iron piece on which a coil of insulated copper wire is wound. It is a temporary magnet. (e). Electromagnet (1). electric bell Electromagnet is used in electric bell. Electromagnet behaves like a magnet when current passes through it. Column A Column B (a). Human body (3). conductor (b). Silk thread (5). insulator (c). Charge in motion (2). current (d). Soft iron (4). electromagnet (e). Electromagnet (1). electric bell

E M B I B E

Concise PHYSICS Middle School 7>Chapter 7 - Electricity and Magnetism>TEST YOURSELF>Q 1

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IMPORTANT

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A switch is an on-off device in an electric circuit.

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Important Questions on Electricity and Magnetism

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Concise PHYSICS Middle School 7>Chapter 7 - Electricity and Magnetism>TEST YOURSELF>Q 2

A magnet has _____ (one/ two/ four) poles.

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Concise PHYSICS Middle School 7>Chapter 7 - Electricity and Magnetism>TEST YOURSELF>Q 2

An electromagnet is used to separate large mass of _____ scrap.

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Concise PHYSICS Middle School 7>Chapter 7 - Electricity and Magnetism>TEST YOURSELF>Q 2

The strength of magnetic field of an electromagnet is increased by inserting a core of soft _____.

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Concise PHYSICS Middle School 7>Chapter 7 - Electricity and Magnetism>TEST YOURSELF>Q 2

To light a table lamp and to run a refrigerator, we use _____ as the source of electricity. (mains/dry cell)

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Concise PHYSICS Middle School 7>Chapter 7 - Electricity and Magnetism>TEST YOURSELF>Q 2

A group of two or more cells is called a _____.

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Concise PHYSICS Middle School 7>Chapter 7 - Electricity and Magnetism>TEST YOURSELF>Q 3

Match the following

Column A	Column B
(a). Human body	(1). electric bell
(b). Silk thread	(2). current
(c). Charge in motion	(3). conductor
(d). Soft iron	(4). electromagnet
(e). Electromagnet	(5). insulator