Fun with Magnets Test

Result

Fun with Magnets Test - 1

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Weekly Quiz Competition

Question 1
1 / -0

If a magnet is cut into four pieces length-wise, then the number of poles obtained will be

A
4

B
8

C
16

D
2

Solution

Every magnet has two poles. So, when a magnet is cut into four pieces length-wise, eight poles will be obtained.
Each small magnet will have its own north and south pole.
Question 2
1 / -0

The needle of a compass is made of a magnet because it _____.

(i) attracts metal
(ii) gets deflected when a magnet is brought nearby
(iii) comes to rest in East-West direction
(iv) comes to rest in North-South direction

A
(i) and (ii)

B
(i), (ii) and (iii)

C
(ii) and (iv)

D
(ii) only

Solution

A magnetic compass contains a small magnetic needle or pin which aligns itself along N - S direction, and gets deflected in a magnetic field or when a magnet is brought near it.
Question 3
1 / -0

Which of the following statements is/are true?

(a) A magnetic compass has a translucent cover on circular dial.
(b) A compass needle is a magnetised needle.
(c) A compass needle has the same type of poles on both sides.

A
Only (a) and (b)

B
Only (c)

C
Only (b) and (c)

D
Only (b)

Solution

A magnetic compass contains a small magnetic pin or needle which aligns itself along the North -South direction when left undisturbed.
Hence the statement 'b' is correct.

A magnetic compass has a transparent glass cover on circular dial. Hence, statement 'a' is incorrect.

The magnetic needle has a North and a South pole at the opposite ends. Hence, the statement 'c' is incorrect.
Question 4
1 / -0

If magnetised iron filings are mixed with soil and a bar of thermocol is placed over it, then what type of force will act between the
thermocol bar and iron filings mixed with the soil?

(a) Strong force of repulsion
(b) No force of attraction
(c) No force of repulsion
(d) Strong force of attraction

A
Only (a)

B
Both (b) and (c)

C
Only (d)

D
Only (b)

Solution

As the thermocol is a non-magnetic substance, so it will not be attracted or repelled by magnetised iron filings.
Question 5
1 / -0

Which of the following materials is best suited for making magnetic keepers?

A
Wood

B
Steel

C
Iron

D
Alnico

Solution

Magnetic keepers are soft iron bars placed at either end of a pair of magnets. It is used to avoid self-demagnetisation of magnets.

The magnets are arranged in pairs with opposite poles facing each other. Two soft irons are placed at the either end of the pair of magnets.