[1 Marks Each] QUE - ANS - Page 2 - Science STD 6 Questions

Question 511 Mark

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?

Answer

She could not succeed because the stainless steel pins are not made of iron, i.e. they are non-magnetic, so they are not attracted towards magnet.

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Question 521 Mark

State whether the statement are true or false:
A compass can be used to find East-West direction at any place.

Answer

True.
Explanation:
A magnetic compass always points towards the North-South direction.

If the North−South direction is known, then the East−West direction can also be determined. This direction is perpendicular to the North-South direction, i.e., perpendicular to the compass needle in the same plane.

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Question 531 Mark

What is the use of magnetic compass?

Answer

The magnetic compass is used to know about the directions as its needle points to north-south direction.

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Question 541 Mark

Hang a bar magnet with a thread on a stand and rotate the base of stand. What will happen?

Answer

The direction of bar magnet is not changed as we rotate the stand. It is because a freely suspended magnet comes to rest in particular direction, i.e., north-south directions. In this activity, only stand changes its direction.

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Question 551 Mark

Fill in the blanks:
In a bar magnet, magnetic attraction is near its ends.

Answer

In a bar magnet, magnetic attraction is near its ends.
Explanation:
Strong; In a bar magnet, magnetic attraction or its strength is maximum at poles and minimum at the centre.

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Question 561 Mark

Name the first magnet.

Answer

Lodestone.

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Question 571 Mark

What is a magnetic compass?

Answer

Magnetic compass is a small box with glass cover. It consists of a magnetised needle, which rotates freely and indicates north south direction when comes to rest.

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Question 581 Mark

How do the shipmen find the direction even when north pointing pole star is not visible?

Answer

Shipmen during navigation can find the direction with the help of magnetic needle. This is believed to be first used by Chinese.

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Question 591 Mark

What are non-magnetic substances?

Answer

Substances which are not attracted by magnet are called non-magnetic substances.

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Question 601 Mark

Write any one property of magnet.

Answer

Same pole of magnet repel each other.

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Question 611 Mark

What are the two poles of magnet?

Answer

North and South Pole.

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Question 621 Mark

How should we keep a horse shoe magnet?

Answer

For horse shoe magnet one should keep a piece of iron across the poles.

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Question 631 Mark

Can a magnet be demagnetised? How?

Answer

Yes, a magnet can be demagnetised:

By packing like poles of two magnets in same direction.
By hammering the magnet hard.
By heating the magnet strongly.

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Question 641 Mark

Magnet was first discovered in Greece. Is the statement true?

Answer

Yes.

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Question 651 Mark

State whether the statement are true or false:
Similar poles of a magnet repel each other.

Answer

True.
Explanation:
Like poles of magnets repel each other, while unlike poles of magnets attract each other. The south pole of a magnet attracts the north pole of another magnet and repels the south pole of that magnet.

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Question 661 Mark

Why is compass needle kept in a closed glass vessel?

Answer

Compass needle is a small and thin magnet used to find the direction. If it is kept in open, it may deflect in any direction due to pressure exerted by air. So to know right direction, it is kept covered by glass covering.

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Question 671 Mark

Which is the north-pole of a bar magnet?

Answer

It is the tip of a bar magnet which points towards the north direction.

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Question 681 Mark

What are magnetic materials (substances)?

Answer

Materials which get attracted by the magnet are called magnetic materials (substances).

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Question 691 Mark

Activity.Magnetise an iron needle using a bar tnagnet. Now, insert the magnetised needle through a small piece of cork or foam. Let the cork float in water in a bowl or a tub. Make sure that the needle does not touch the water (Fig.). Your compass is now ready to work.
Make a note of the direction in which the needle points when the cork is floating. Rotate the cork, with the needle fixed in it, in different directions. Note the direction in which the needle points when the cork begins to float again without rotating. Does the needle always point in the same direction, when the cork stops rotating?

Answer

Yes, the needle always points towards the north when the cork stops rotating.

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Question 701 Mark

Write two cautions to keep a magnet.

Answer

Bar magnets should be kept in pairs with their unlike poles on the same side. They must be separated by piece of wood. For horse shoe magnet one should keep a piece of iron across the poles.

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Question 711 Mark

Make a list of given substances into two groups – magnetic and non¬magnetic.
Key, Wood, Glass, Alpin, Chalk, Pencil, Nail, Cup of tea, Book, Rubber, Needle, Fork.table

Answer

Magnetic substances: Key, alpin, nail, needle, fork (because all these stick to the magnet)
Non-magnetic substances: Wood, glass, chalk, pencil, cup of tea, book, rubber. (none of these sticks to the magnet)

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Question 721 Mark

State whether the statement are true or false:
Bar magnets always point towards North-South direction.

Answer

True.
Explanation:
A freely suspended magnet always points towards the North-South direction.

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Question 731 Mark

When was magnetite discovered?

Answer

Magnetite was discovered around $800 B.C.$

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Question 741 Mark

Can an ordinary vessel (lota) be magnetised?

Answer

Yes, to magnetise ordinary vessel, it would have to be buried in the earth for many years.

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Question 751 Mark

What is an electromagnet?

Answer

A soft metal core made into a magnet by the passage of electric current through a coil surrounding it.

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Question 761 Mark

Can we isolate north-pole or south-pole?

Answer

No, we cannot isolate north-pole of a magnet from its south-pole or vice versa. If you break a bar magnet into two halves, you will not get a single north or south pole but two magnets each with its north and south-poles.

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Question 771 Mark

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

Answer

The needle can be found by using a magnet. Since needle is magnetic, when a magnet is wavered over the floor, it will stick to the magnet.

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Question 781 Mark

Write any two uses of magnet.

Answer

Magnetic compass can be used to know about the directions. Magnet can be used to separate magnetic materials such as iron from the non-magnetic ones.

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Science [1 Marks Each] QUE - ANS

[1 Marks Each] QUE - ANS