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Question (31)

QN0011303

Which bulb is more energy efficient according to the chapter?

(A) is correct because LED bulbs provide the same light while using less electricity.
(B) Incandescent bulb
(C) Oil lamp
(D) Candle

Correct Answer: A

Explanation:

Option (a) is correct because LED bulbs provide the same light while using less electricity.

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Question (32)

QN0011304

Most electricity is commonly produced by burning

(A) is correct because coal is widely used to generate electricity.
(B) cotton
(C) paper
(D) rubber

Correct Answer: A

Explanation:

Option (a) is correct because coal is widely used to generate electricity.

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Question (33)

QN0011305

Why is burning coal a concern?

(A) is correct because burning coal pollutes the air.
(B) It produces no energy
(C) It cools the Earth too much
(D) It stops machines from working

Correct Answer: A

Explanation:

Option (a) is correct because burning coal pollutes the air.

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Question (34)

QN0011306

A pinwheel rotates when exposed to wind. This shows that wind can provide

(A) is correct because wind energy can cause objects to move.
(B) food energy
(C) fuel energy only
(D) stored energy only

Correct Answer: A

Explanation:

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

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Question (35)

QN0011307

In the water wheel activity, the wheel spins because

(A) is correct because flowing water transfers energy to the wheel.
(B) the cup becomes heavier
(C) the pencil melts
(D) sunlight heats the wheel

Correct Answer: A

Explanation:

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

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Question (36)

QN0011308

Which set contains only clean energy sources mentioned in the chapter?

(A) Coal, wood, diesel
(B) is correct because the Sun, wind and water are clean energy sources.
(C) Petrol, coal, gas
(D) Wood, coal, petrol

Correct Answer: B

Explanation:

Option (b) is correct because the Sun, wind and water are clean energy sources.

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Question (37)

QN0011309

Solar panels mainly convert sunlight into

(A) cloth
(B) is correct because solar panels generate electricity from sunlight.
(C) fuel
(D) food

Correct Answer: B

Explanation:

Option (b) is correct because solar panels generate electricity from sunlight.

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Question (38)

QN0011310

Which statement about clean energy is correct?

(A) It pollutes the air heavily
(B) It produces large amounts of smoke
(C) is correct because clean energy sources do not produce smoke or harmful waste.
(D) It can only be used in villages

Correct Answer: C

Explanation:

Option (c) is correct because clean energy sources do not produce smoke or harmful waste.

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Question (39)

QN0011311

Ancient traders from Gujarat and Tamil Nadu used large sails mainly to capture

(A) water energy
(B) is correct because sails use the power of the wind for movement.
(C) food energy
(D) battery energy

Correct Answer: B

Explanation:

Option (b) is correct because sails use the power of the wind for movement.

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Question (40)

QN0011312

A family installs solar panels on the roof and uses LED bulbs inside the house. Which statement best describes this choice?

(A) It wastes more energy
(B) It increases pollution
(C) is correct because solar panels provide clean energy and LED bulbs save electricity.
(D) It eliminates the need for sunlight

Correct Answer: C

Explanation:

Option (c) is correct because solar panels provide clean energy and LED bulbs save electricity.

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Question (31)

Which bulb is more energy efficient according to the chapter?

Explanation:

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Question (32)

Most electricity is commonly produced by burning

Explanation:

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Question (33)

Why is burning coal a concern?

Explanation:

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Question (34)

A pinwheel rotates when exposed to wind. This shows that wind can provide

Explanation:

Link:

Question (35)

In the water wheel activity, the wheel spins because

Explanation:

Link:

Question (36)

Which set contains only clean energy sources mentioned in the chapter?

Explanation:

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Question (37)

Solar panels mainly convert sunlight into

Explanation:

Link:

Question (38)

Which statement about clean energy is correct?

Explanation:

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Question (39)

Ancient traders from Gujarat and Tamil Nadu used large sails mainly to capture

Explanation:

Link:

Question (40)

A family installs solar panels on the roof and uses LED bulbs inside the house. Which statement best describes this choice?

Explanation:

Link:

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