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Question (11)

QN0031258

A mechanic magnetises a screwdriver by stroking it with a magnet 35 times in the same direction. The main purpose is to

(A) increase its weight
(B) make screws stick to it
(C) reduce friction
(D) sharpen its tip

Correct Answer: B

Explanation:

Magnetised tools can hold steel screws.

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Question (12)

QN0031259

A student places a cardboard sheet between a compass and a magnet. The compass needle still deflects. This shows that magnetic force can act

(A) only in air
(B) only in vacuum
(C) through non-magnetic materials
(D) only by contact

Correct Answer: C

Explanation:

Cardboard is non-magnetic, yet magnetic effect passes through it.

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Question (13)

QN0031260

A bar magnet attracts 18 pins at one pole and 17 pins at the other pole. If only 2 pins stick at the centre, what is the total number of pins attracted?

(A) 35
(B) 36
(C) 37
(D) 39

Correct Answer: C

Explanation:

Total pins = 18 + 17 + 2 = 37.

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Question (14)

QN0031261

A student wants to identify a magnet among three identical metal bars. Which property should be used?

(A) Attraction only
(B) Colour of the bar
(C) Repulsion between bars
(D) Length of the bar

Correct Answer: C

Explanation:

Only magnets can repel; iron bars cannot.

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Question (15)

QN0031262

If the red end of a compass needle points towards geographic north, the red end represents the

(A) South pole of the needle
(B) North pole of the needle
(C) middle part of the needle
(D) unmagnetised end

Correct Answer: B

Explanation:

The north-seeking end is usually painted red.

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Question (16)

QN0031263

A student keeps a magnet near a mobile phone for many days. This is discouraged because magnets can

(A) increase battery life
(B) damage electronic devices
(C) increase signal strength
(D) reduce phone weight

Correct Answer: B

Explanation:

Magnets should be kept away from electronic devices.

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Question (17)

QN0031264

Two ring magnets are placed on a vertical rod with like poles facing each other. The upper magnet remains suspended above the lower one because

(A) gravity disappears
(B) unlike poles attract
(C) like poles repel
(D) air supports the magnet

Correct Answer: C

Explanation:

Repulsive force between like poles balances the weight of the upper magnet.

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Question (18)

QN0031265

A student examines 20 objects and finds that 8 are magnetic. What percentage of the tested objects are non-magnetic?

(A) 20%
(B) 40%
(C) 60%
(D) 80%

Correct Answer: C

Explanation:

Non-magnetic objects = 20 – 8 = 12. Percentage = (12/20) × 100 = 60%.

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Question (19)

QN0031266

Which of the following observations confirms that an unknown object is definitely a magnet?

(A) It attracts iron filings
(B) It attracts an iron nail
(C) It repels the North pole of a known magnet
(D) It is made of iron

Correct Answer: C

Explanation:

Repulsion is the sure test of magnetism.

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Question (20)

QN0031267

A magnetic compass is accidentally placed near a strong bar magnet. The compass needle points towards the bar magnet instead of geographic north. This happens because

(A) the compass needle is broken
(B) the nearby magnet exerts a stronger influence
(C) Earth loses its magnetic property
(D) the compass becomes non-magnetic

Correct Answer: B

Explanation:

A nearby strong magnet can alter the direction of the compass needle.

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Question (11)

A mechanic magnetises a screwdriver by stroking it with a magnet 35 times in the same direction. The main purpose is to

Explanation:

Link:

Question (12)

A student places a cardboard sheet between a compass and a magnet. The compass needle still deflects. This shows that magnetic force can act

Explanation:

Link:

Question (13)

A bar magnet attracts 18 pins at one pole and 17 pins at the other pole. If only 2 pins stick at the centre, what is the total number of pins attracted?

Explanation:

Link:

Question (14)

A student wants to identify a magnet among three identical metal bars. Which property should be used?

Explanation:

Link:

Question (15)

If the red end of a compass needle points towards geographic north, the red end represents the

Explanation:

Link:

Question (16)

A student keeps a magnet near a mobile phone for many days. This is discouraged because magnets can

Explanation:

Link:

Question (17)

Two ring magnets are placed on a vertical rod with like poles facing each other. The upper magnet remains suspended above the lower one because

Explanation:

Link:

Question (18)

A student examines 20 objects and finds that 8 are magnetic. What percentage of the tested objects are non-magnetic?

Explanation:

Link:

Question (19)

Which of the following observations confirms that an unknown object is definitely a magnet?

Explanation:

Link:

Question (20)

A magnetic compass is accidentally placed near a strong bar magnet. The compass needle points towards the bar magnet instead of geographic north. This happens because

Explanation:

Link:

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