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Question (1)

QN0031248

A student tests four objects with a magnet: an iron nail, a plastic ruler, a nickel coin and a glass marble. How many of these objects are expected to be attracted by the magnet?

(A) 1
(B) 2
(C) 3
(D) 4

Correct Answer: C

Explanation:

Iron and nickel are magnetic materials, while plastic and glass are non-magnetic. Hence, 3 objects will be attracted.

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Question (2)

QN0031249

A bar magnet attracts 24 iron pins. If 10 pins stick near one pole and 11 near the other pole, approximately how many pins will stick near the middle part?

(A) 3
(B) 10
(C) 11
(D) 24

Correct Answer: A

Explanation:

Most pins stick near the poles. Remaining pins = 24 – (10 + 11) = 3, which stick near the middle.

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Question (3)

QN0031250

A freely suspended magnet is rotated and released five times. Each time it comes to rest in the same direction. This observation shows that the object is most likely a

(A) wooden stick
(B) piece of aluminium
(C) magnet
(D) plastic rod

Correct Answer: C

Explanation:

Only a freely suspended magnet always aligns in the north-south direction.

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Question (4)

QN0031251

Which of the following materials placed between a magnet and a compass needle is least likely to affect the compass deflection?

(A) Iron sheet
(B) Wooden sheet
(C) Steel plate
(D) Iron bar

Correct Answer: B

Explanation:

Magnetic effects can pass through non-magnetic materials like wood.

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Question (5)

QN0031252

A magnet is broken into 8 smaller pieces. How many magnetic poles will be present altogether in the pieces obtained?

(A) 8
(B) 10
(C) 16
(D) 32

Correct Answer: C

Explanation:

Each piece has two poles. Total poles = 8 × 2 = 16.

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Question (6)

QN0031253

Two identical bar magnets are arranged so that the North pole of one faces the South pole of the other. The magnets will

(A) repel each other
(B) attract each other
(C) show no interaction
(D) rotate randomly

Correct Answer: B

Explanation:

Unlike poles attract each other.

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Question (7)

QN0031254

A child brings the North pole of a bar magnet close to the North pole of a compass needle. The compass needle moves away because

(A) unlike poles repel
(B) like poles attract
(C) like poles repel
(D) Earth stops acting as a magnet

Correct Answer: C

Explanation:

Both poles are North poles; hence repulsion occurs.

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Question (8)

QN0031255

Out of iron, cobalt, copper and nickel, how many are magnetic materials?

(A) 1
(B) 2
(C) 3
(D) 4

Correct Answer: C

Explanation:

Iron, cobalt and nickel are magnetic materials, whereas copper is not.

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Question (9)

QN0031256

A magnetised needle floating on water is rotated through 90°. After some time, it again points north-south. This happens because

(A) water pushes the needle
(B) Earth behaves like a giant magnet
(C) air currents rotate it
(D) the needle loses magnetism

Correct Answer: B

Explanation:

Earth's magnetic field aligns the magnetised needle.

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Question (10)

QN0031257

Three students predict the number of poles in a ring magnet, a U-shaped magnet and a bar magnet as 1, 2 and 2 respectively. How many predictions are correct?

(A) 0
(B) 1
(C) 2
(D) 3

Correct Answer: C

Explanation:

Every magnet has two poles. Thus, predictions for U-shaped and bar magnets are correct.

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Question (1)

A student tests four objects with a magnet: an iron nail, a plastic ruler, a nickel coin and a glass marble. How many of these objects are expected to be attracted by the magnet?

Explanation:

Link:

Question (2)

A bar magnet attracts 24 iron pins. If 10 pins stick near one pole and 11 near the other pole, approximately how many pins will stick near the middle part?

Explanation:

Link:

Question (3)

A freely suspended magnet is rotated and released five times. Each time it comes to rest in the same direction. This observation shows that the object is most likely a

Explanation:

Link:

Question (4)

Which of the following materials placed between a magnet and a compass needle is least likely to affect the compass deflection?

Explanation:

Link:

Question (5)

A magnet is broken into 8 smaller pieces. How many magnetic poles will be present altogether in the pieces obtained?

Explanation:

Link:

Question (6)

Two identical bar magnets are arranged so that the North pole of one faces the South pole of the other. The magnets will

Explanation:

Link:

Question (7)

A child brings the North pole of a bar magnet close to the North pole of a compass needle. The compass needle moves away because

Explanation:

Link:

Question (8)

Out of iron, cobalt, copper and nickel, how many are magnetic materials?

Explanation:

Link:

Question (9)

A magnetised needle floating on water is rotated through 90°. After some time, it again points north-south. This happens because

Explanation:

Link:

Question (10)

Three students predict the number of poles in a ring magnet, a U-shaped magnet and a bar magnet as 1, 2 and 2 respectively. How many predictions are correct?

Explanation:

Link:

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