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# Selina solutions for Class 7 Physics chapter 7 - Electricity and Magnetism

## Chapter 7: Electricity and Magnetism

#### Chapter 7: Electricity and Magnetism solutions [Page 0]

Write true or false

A current carrying coil when suspended freely can rest in any direction.

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A coil carrying current behaves like a magnet.

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In an electromagnet, the core is made up of copper.

Write true or false

An electric bell uses an electromagnet.

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An electromagnet with soft iron core is a temporary magnet.

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We use cell as the source of electricity to run an electric immersion rod.

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A torch bulb glows if the terminals of the bulb are connected to the terminals of a cell by the metallic wire

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Wool is a conductor of electricity.

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Silver is an insulator of electricity.

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Our body is a conductor of electricity.

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For a circuit to be complete, every part of it must be made up of conductors.

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All metals are conductors of electricity.

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The switch should not be touched with wet hands.

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

Fill in the blank

A magnet has.......... poles.

Fill in the blank

Like poles ............each other and unlike poles ...............

Fill in the blank

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

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

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In a torch we use ................as the source of electricity.

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To light a table lamp and to run a refrigerator, we use ......... as the source of electricity.

Fill in the blank

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

Fill in the blank

.............. pass electricity through them.

Fill in the blank

.......................... do not pass electricity through them.

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

Select the correct alternative

A freely suspended magnet rests in

1.  east-west direction
2.  north-south direction
3.  north-east direction
4.  north-west direction.

Select the correct alternative

1.  steel
2.  copper
3.  brass
4.  soft iron.

Select the correct alternative

An electromagnet is used in

1.  electric oven
2.  ammeter
3.  electric bell

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The purpose of armature in an electric bell is

1. to make and break the circuit
2.  to produce sound
3.  to produce magnetic field
4.  to provide spring action.

Select the correct alternative

In a torch, the source of electricity is

1.  the bulb
2.  the switch
3.  the cell
4.  the mains.

Select the correct alternative

Electricity can flow through

1. wood
2.  rubber
3.  plastic
4.  copper wire.

Select the correct alternative

Electricity does not flow through

1.  human body
2.  animals body
3.  rubber
4.  silver.

Select the correct alternative

We should not touch the switch with wet hands otherwise

1.  electricity may pass through our body
2.  electricity may not pass through the appliance
3.  circuit may break
4.  the switch may get off

#### Chapter 7: Electricity and Magnetism solutions [Page 0]

State two properties of a bar magnet ?

How will you test whether a given rod is a magnet or not ?

How will you test whether a given rod is made of iron or not?

You are given two similar bars. One is a magnet and the other is of soft iron. How will you distinguish and identify them ?

You are given a magnet. How will you use it to find north- south direction at a place ?

Describe a simple experiment to illustrate that like poles of two magnets repel each other while the unlike poles attract ?

“Poles exist in pair”. Comment on this statement ?

What is a magnetic compass ? State its use.

Explain the meaning of the term magnetic field ?

What is an electromagnet ?

Name the material of an electromagnet ?

Draw a labelled diagram to make a soft iron bar as an electromagnet. Describe in steps the procedure ?

You are given a U shaped soft iron piece, insulated copper wire and a battery. Draw a circuit diagram to make a horse shoe electromagnet ?

Name two factors on which the strength of magnetic field of an electromagnet depends ?

State two ways by which the strength of magnetic field of an electromagnet can be increased ?

State two common uses of electromagnets  ?

Name a domestic device in which an electromagnet is used ?

Draw a neat and labelled diagram of an electric bell and describe its working ?

The incomplete diagram of an electric bell is given in fig. Complete the diagram and label its different parts ?

What is declination ? Draw a diagram to show the angle between the declination and true direction of geographic north.

Define the term current ?

Name four appliances which work using electricity ?

Name two sources of electricity.

What is a battery ?

What is an electric circuit ?

Describe an experiment to show that electricity flows only if the circuit is complete and it does not flow if the circuit is incomplete.

You are provided with a torch bulb, a cell and two plastic coated f metal wires. Draw a diagram to show a complete circuit to light the bulb.

In which of the following case the bulb will glow :

Distinguish between conductors and insulators of electricity. Give two examples of each.

Select conductors and insulators from the following :
Glass, silver, copper, wood, paper, pure water, impure water, aluminium, iron, leather, plastic, steel, human body and ebonite.

The following diagram shows four circuits A, B, C and D. Each circuit has a cell and a torch bulb. Name the circuits in which the bulb will glow ? Give reason to your answer

The diagram given below shows a bulb connected with a cell having terminals A and B. Mark the direction of current in the bulb.

State the function of each of the following in an electric circuit and draw its symbolic representation: (1) Switch and (2) Cell.

Draw a circuit diagram for a bulb connected to a cell with a switch. Mark arrow in the diagram to indicate the direction of flow of current.

In which arrangement are the appliances connected in the electric circuit of our homes, Series or Parallel ? Give one reason for your answer.

State two precautions that you must take when switching on an electric circuit.

## Selina solutions for Class 7 Physics chapter 7 - Electricity and Magnetism

Selina solutions for Class 7 Physics chapter 7 (Electricity and Magnetism) include all questions with solution and detail explanation. This will clear students doubts about any question and improve application skills while preparing for board exams. The detailed, step-by-step solutions will help you understand the concepts better and clear your confusions, if any. Shaalaa.com has the CISCE Selina Concise Physics - Middle School for Class 7 (2018-19 Session) solutions in a manner that help students grasp basic concepts better and faster.

Further, we at Shaalaa.com are providing such solutions so that students can prepare for written exams. Selina textbook solutions can be a core help for self-study and acts as a perfect self-help guidance for students.

Concepts covered in Class 7 Physics chapter 7 Electricity and Magnetism are Laws of Magnetism, Test for a Magnet (By Repulsion), Electromagnetism, Electromagnets and Their Applications- Electric Bell, Electric Current as a Flow of Charges, Electric Cell as Source of Electricity, Resistors as Components that Oppose the Flow of Current, Symbolic Representation of Electrical Components (Key,Battery, Bulb, Conducting Wire, Resistor), Simple Electric Circuit - Series and Parallel, Battery as a Collection of Cells Connected in Series, Good and Bad Conductors of Electricity, Concept of Electricity and Magnetism.

Using Selina Class 7 solutions Electricity and Magnetism exercise by students are an easy way to prepare for the exams, as they involve solutions arranged chapter-wise also page wise. The questions involved in Selina Solutions are important questions that can be asked in the final exam. Maximum students of CISCE Class 7 prefer Selina Textbook Solutions to score more in exam.

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