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Question (21)

QN0011333

Which of the following is a clean source of energy?

(A) Coal
(B) Diesel
(C) is correct because the Sun provides clean energy without causing pollution.
(D) Wood

Correct Answer: C

Explanation:

Option (c) is correct because the Sun provides clean energy without causing pollution.

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Question (22)

QN0011334

The Sun is considered the main source of energy for

(A) Mars only
(B) is correct because the Sun is the primary source of energy for life on Earth.
(C) oceans only
(D) forests only

Correct Answer: B

Explanation:

Option (b) is correct because the Sun is the primary source of energy for life on Earth.

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Question (23)

QN0011335

In the sunlight-water activity, water kept in sunlight becomes warmer because of energy from

(A) food
(B) wind
(C) is correct because sunlight provides heat energy.
(D) fuel

Correct Answer: C

Explanation:

Option (c) is correct because sunlight provides heat energy.

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Question (24)

QN0011336

Two cups are placed outside. One remains in sunlight for 10 minutes and the other for 30 minutes. Which receives more solar energy?

(A) First cup
(B) is correct because longer exposure to sunlight means more solar energy received.
(C) Both equal
(D) Neither

Correct Answer: B

Explanation:

Option (b) is correct because longer exposure to sunlight means more solar energy received.

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Question (25)

QN0011337

A pinwheel rotates when wind blows. This shows that wind is a source of

(A) is correct because wind energy can make objects move.
(B) food energy
(C) sound energy only
(D) fuel energy only

Correct Answer: A

Explanation:

Option (a) is correct because wind energy can make objects move.

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Question (26)

QN0011338

If a pinwheel completes 5 rotations in weak wind and 20 rotations in strong wind, which wind provided more energy?

(A) Weak wind
(B) is correct because stronger wind causes greater movement.
(C) Both same
(D) Cannot say

Correct Answer: B

Explanation:

Option (b) is correct because stronger wind causes greater movement.

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Question (27)

QN0011339

Ancient ships used large sails mainly to capture

(A) water energy
(B) solar energy
(C) is correct because sails use wind to move ships.
(D) food energy

Correct Answer: C

Explanation:

Option (c) is correct because sails use wind to move ships.

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Question (28)

QN0011340

Traders from Gujarat and Tamil Nadu travelled long distances in ancient times using

(A) coal-powered ships
(B) is correct because wind-filled sails powered their journeys.
(C) electric motors
(D) batteries

Correct Answer: B

Explanation:

Option (b) is correct because wind-filled sails powered their journeys.

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Question (29)

QN0011341

In the water wheel activity, the wheel rotates because of energy from

(A) soil
(B) is correct because flowing water transfers energy to the wheel.
(C) coal
(D) food

Correct Answer: B

Explanation:

Option (b) is correct because flowing water transfers energy to the wheel.

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Question (30)

QN0011342

A water wheel makes 12 turns when one bucket of water is poured and 24 turns when two buckets are poured. Which provided more energy?

(A) One bucket
(B) is correct because more flowing water can provide more energy.
(C) Both same
(D) Neither

Correct Answer: B

Explanation:

Option (b) is correct because more flowing water can provide more energy.

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Question (21)

Which of the following is a clean source of energy?

Explanation:

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Question (22)

The Sun is considered the main source of energy for

Explanation:

Link:

Question (23)

In the sunlight-water activity, water kept in sunlight becomes warmer because of energy from

Explanation:

Link:

Question (24)

Two cups are placed outside. One remains in sunlight for 10 minutes and the other for 30 minutes. Which receives more solar energy?

Explanation:

Link:

Question (25)

A pinwheel rotates when wind blows. This shows that wind is a source of

Explanation:

Link:

Question (26)

If a pinwheel completes 5 rotations in weak wind and 20 rotations in strong wind, which wind provided more energy?

Explanation:

Link:

Question (27)

Ancient ships used large sails mainly to capture

Explanation:

Link:

Question (28)

Traders from Gujarat and Tamil Nadu travelled long distances in ancient times using

Explanation:

Link:

Question (29)

In the water wheel activity, the wheel rotates because of energy from

Explanation:

Link:

Question (30)

A water wheel makes 12 turns when one bucket of water is poured and 24 turns when two buckets are poured. Which provided more energy?

Explanation:

Link:

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