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Question (11)

QN0011323

Why should wood and coal be used carefully?

(A) They melt easily
(B) is correct because burning wood and coal causes pollution.
(C) They absorb sunlight
(D) They produce water

Correct Answer: B

Explanation:

Option (b) is correct because burning wood and coal causes pollution.

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Question (12)

QN0011324

In the diya activity, which substance acts as the fuel?

(A) Wick
(B) Clay
(C) is correct because oil provides energy for burning.
(D) Air

Correct Answer: C

Explanation:

Option (c) is correct because oil provides energy for burning.

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Question (13)

QN0011325

Two diyas are lit. One contains oil and the other does not. Which burns longer?

(A) is correct because the oil acts as fuel.
(B) The diya without oil
(C) Both equally
(D) Neither burns

Correct Answer: A

Explanation:

Option (a) is correct because the oil acts as fuel.

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Question (14)

QN0011326

If Diya A has 15 mL oil and Diya B has 30 mL oil, which is likely to burn longer?

(A) Diya A
(B) is correct because more fuel generally burns for a longer time.
(C) Both equally
(D) Cannot be predicted

Correct Answer: B

Explanation:

Option (b) is correct because more fuel generally burns for a longer time.

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Question (15)

QN0011327

Which source of energy is used by many electrical appliances at home?

(A) is correct because appliances need electricity to operate.
(B) Sand
(C) Paper
(D) Cotton

Correct Answer: A

Explanation:

Option (a) is correct because appliances need electricity to operate.

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Question (16)

QN0011328

A fan, television and refrigerator all require which source of energy?

(A) Fuel
(B) Food
(C) is correct because these devices run on electricity.
(D) Wind

Correct Answer: C

Explanation:

Option (c) is correct because these devices run on electricity.

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Question (17)

QN0011329

Which of the following can be produced using electricity?

(A) Light
(B) Heat
(C) Sound
(D) is correct because electricity can produce light, heat and sound.

Correct Answer: D

Explanation:

Option (d) is correct because electricity can produce light, heat and sound.

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Question (18)

QN0011330

If there is no electricity in a house for a day, which appliance is least likely to work?

(A) Fan
(B) Refrigerator
(C) Television
(D) is correct because all these appliances require electricity.

Correct Answer: D

Explanation:

Option (d) is correct because all these appliances require electricity.

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Question (19)

QN0011331

Most electricity is commonly generated by burning

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

Correct Answer: A

Explanation:

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

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Question (20)

QN0011332

Burning coal for electricity generation releases

(A) oxygen only
(B) is correct because burning coal causes air pollution.
(C) clean air
(D) water vapour only

Correct Answer: B

Explanation:

Option (b) is correct because burning coal causes air pollution.

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Question (11)

Why should wood and coal be used carefully?

Explanation:

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Question (12)

In the diya activity, which substance acts as the fuel?

Explanation:

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Question (13)

Two diyas are lit. One contains oil and the other does not. Which burns longer?

Explanation:

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Question (14)

If Diya A has 15 mL oil and Diya B has 30 mL oil, which is likely to burn longer?

Explanation:

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Question (15)

Which source of energy is used by many electrical appliances at home?

Explanation:

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Question (16)

A fan, television and refrigerator all require which source of energy?

Explanation:

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Question (17)

Which of the following can be produced using electricity?

Explanation:

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Question (18)

If there is no electricity in a house for a day, which appliance is least likely to work?

Explanation:

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Question (19)

Most electricity is commonly generated by burning

Explanation:

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Question (20)

Burning coal for electricity generation releases

Explanation:

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