A bar magnet is immersed in a heap of iron filings and pulled out. The amount of iron filings Clinging to the

1

(a)

North pole is almost equal to the South pole

(b)

North pole is much less than the South pole

(c)

North pole is much less than the South pole

(d)

magnet will be same all along its length

North pole of a magnet can be identified by

1

(a)

another magnet having its poles marked as North Pole and South pole

(b)

another magnet no matter whether the poles are marked or not

(c)

using an iron bar

(d)

using iron filings

Magnets have a shape of

1

(a)

cylindrical

(b)

horse-shoe

(c)

ball-ended magnet

(d)

All of these

A freely suspended magnet always points in the

1

(a)

upside down

(b)

East-West direction

(c)

North-South direction

(d)

Any direction by chance

Three magnets A, B and C were dipped one by one in a heap of iron filings. Figure shows the amount of the iron filings sticking to them. The strength of these magnets will be

1

(a)

A > B> C

(b)

A < B < C

(c)

A = B = C

(d)

A < B > C

Which of the following is a confirmatory evidence of a pure magnet?

1

(a)

Attraction

(b)

Repulsion

(c)

None of these

(d)

Both of these

A horse shoe magnet has:

1

(a)

No poles

(b)

One pole

(c)

Two'poles

(d)

Infinite poles

Observe the pictures A and B given in Fig, carefully.

Which of the following statements is correct for the above given pictures?

1

(a)

In A, cars 1 and 2 will come closer and in B, cars 3 and 4 will come closer

(b)

In A, cars 1 and 2 will move away from each other and in B, cars 3 and 4 will move away

(c)

In A, cars 1 and 2 will move away and in B,cars 3 and 4 will come closer to each other

(d)

In A, cars 1 and 2 will come closer to each other and in B, cars 3 and 4 will move away from each other.

When the south poles of two magnets are kept close, they will__________

1

(a)

attract

(b)

repel

(c)

rotate

(d)

remain unaffected

Magnets are used in

1

(a)

refrigerator doors

(b)

credit cards

(c)

door bells

(d)

All of these

When a bar magnet is broken, each of broken part will have ...... pole/poles.

1

(a)

North and South

In a bar magnet, magnetic attraction is _____________near its ends.

1

(a)

strong

Refrigerator doors use the _________property of magnet.

1

(a)

attracting

_________is a tool used by sailors and travellers to find direction.

1

(a)

Magnetic compass

Materials that get attracted to a magnet are called ___________ materials.

1

(a)

magnetic

What is magnetite?

1

(a)

Magnetite is one of the natural ores of iron and also known as natural magnet.

In which country was the magnet use discovered

1

(a)

Magnet use was first discovered in Greece.

If we gently break a bar magnet from its centre, will two poles get free?

1

(a)

No, the two pieces will act as individual magnets.

What is a magnet

1

(a)

A material which shows an attraction for magnetic materials such as iron, cobalt and nickel is called a magnet. When it is suspended freely, it points in the geographical north-south direction

How will you test that 'tea dust' is not adulterated with iron powder?

1

(a)

It will be tested by using a magnet. If 'tea dust' is adulterated with iron powder, it will stick onto the magnet

Paheli and her friends were decorating the class bulletin board. She dropped the box of stainless steel pins by mistake. She tried to collect the pins using a magnet. She could not succeed. What could be the reason for this?

2

(a)

Mention what types of forces act between the two unlike poles of the magnet, if both of them are put together.

2

(a)

When South pole of a magnet comes in contact with South pole of other magnet, than what happens?

2

(a)

A tailor was stitching buttons on his shirt. The needle has slipped from his hand onto the floor. How can you help the tailor to find the needle?

2

(a)

Insert a magnetised needle through a paper cork. Let the cork float in the water placed ina tub in such a way that the cork does not touch the water. Does the needle always point in the same direction when the cork stops rotating?

2

(a)

Name two magnetic and two non-magnetic materials

2

(a)

Define attractive and directive properties of a magnet.

2

(a)

Riya's mother is stitching buttons on a shirt. The needle has slipped from her hand onto the floor. Can Riya help her mother to find the needle?

2

(a)

How do magnetic trains run without touching the ground?

2

(a)

A magnet was broken into five pieces. How many north poles will be present in the broken pieces?

2

(a)

Where are poles of a bar magnet located?

5

(a)

You are given an iron strip. How will you make it into a magnet?

5

(a)

Suggest an arrangement to store a U-shaped magnet. How is this different from storing a pair of bar magnets?

5

(a)

State the ways through which a magnet can be demagnetised.

5

(a)

Describe the steps involved in the magnetising of an iron strip with the help of a magnet.

5

(a)

You are provided with two identical metal bars. Out of the two, one is a magnet. Suggest two ways to identify the magnet.

5

(a)

A bar magnet is cut into two pieces A and B from the middle as shown in figure.

Will the two pieces act as individual magnets? Mark the poles of these two pieces. Suggest an activity to verify your answer.

5

(a)

Where are the poles of a bar magnet located? Suggest a method to locate them.

5

(a)