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Question (11)

QN003841

A magnet is suspended and rotated 8 times. It aligns north–south each time. How many times did it show the direction-finding property?

(A) 4
(B) 6
(C) 8
(D) 10

Correct Answer: C

Explanation:

It showed the property in all 8 trials.

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Question (12)

QN003842

Which instrument was developed based on the north–south aligning property of magnets?

(A) Thermometer
(B) Magnetic compass
(C) Telescope
(D) Barometer

Correct Answer: B

Explanation:

A magnetic compass uses this property.

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Question (13)

QN003843

The needle of a magnetic compass is actually a:

(A) Plastic strip
(B) Wooden pointer
(C) Magnet
(D) Glass rod

Correct Answer: C

Explanation:

The compass needle is a small magnet.

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Question (14)

QN003844

What is the main function of a magnetic compass?

(A) Measure temperature
(B) Measure mass
(C) Find directions
(D) Measure length

Correct Answer: C

Explanation:

A compass is used to identify directions.

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Question (15)

QN003845

A compass needle points north–south. If the compass dial is rotated to match the needle, how many main directions can be identified?

(A) 2
(B) 3
(C) 4
(D) 8

Correct Answer: C

Explanation:

North, South, East and West are the four main directions.

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Question (16)

QN003846

Which part of a compass is usually painted red?

(A) South-seeking end
(B) North-seeking end
(C) Middle portion
(D) Entire needle

Correct Answer: B

Explanation:

The North-seeking end is commonly painted red.

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Question (17)

QN003847

A compass needle is mounted on a pin mainly so that it can:

(A) Float in water
(B) Rotate freely
(C) Become heavier
(D) Become stronger

Correct Answer: B

Explanation:

Free rotation helps it align with Earth's magnetic field.

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Question (18)

QN003848

A student performs an experiment 12 times. The magnet points north–south in all trials. What is the success percentage?

(A) 25%
(B) 50%
(C) 75%
(D) 100%

Correct Answer: D

Explanation:

12 out of 12 successful observations = 100%.

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Question (19)

QN003849

Which property helps distinguish a magnet from an ordinary iron bar?

(A) Colour
(B) Shape
(C) Resting along north–south direction
(D) Weight

Correct Answer: C

Explanation:

A freely suspended magnet aligns North–South.

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Question (20)

QN003850

The magnetic compass used by sailors in olden times helped them:

(A) Measure speed
(B) Find directions
(C) Predict weather
(D) Measure depth of water

Correct Answer: B

Explanation:

Sailors used compasses for navigation.

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Question (11)

A magnet is suspended and rotated 8 times. It aligns north–south each time. How many times did it show the direction-finding property?

Explanation:

Link:

Question (12)

Which instrument was developed based on the north–south aligning property of magnets?

Explanation:

Link:

Question (13)

The needle of a magnetic compass is actually a:

Explanation:

Link:

Question (14)

What is the main function of a magnetic compass?

Explanation:

Link:

Question (15)

A compass needle points north–south. If the compass dial is rotated to match the needle, how many main directions can be identified?

Explanation:

Link:

Question (16)

Which part of a compass is usually painted red?

Explanation:

Link:

Question (17)

A compass needle is mounted on a pin mainly so that it can:

Explanation:

Link:

Question (18)

A student performs an experiment 12 times. The magnet points north–south in all trials. What is the success percentage?

Explanation:

Link:

Question (19)

Which property helps distinguish a magnet from an ordinary iron bar?

Explanation:

Link:

Question (20)

The magnetic compass used by sailors in olden times helped them:

Explanation:

Link:

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