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Question (21)

QN0011293

Which cooking fuel is commonly used in many homes?

(A) is correct because cooking gas is a commonly used fuel in homes.
(B) Chalk
(C) Sand
(D) Cotton

Correct Answer: A

Explanation:

Option (a) is correct because cooking gas is a commonly used fuel in homes.

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Question (22)

QN0011294

Why should wood and coal be used carefully?

(A) They are too cold
(B) is correct because burning wood and coal releases smoke and pollutants.
(C) They produce no energy
(D) They dissolve in water

Correct Answer: B

Explanation:

Option (b) is correct because burning wood and coal releases smoke and pollutants.

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Question (23)

QN0011295

In the diya activity, which diya burns longer?

(A) Diya with wick but no oil
(B) is correct because the oil acts as fuel and helps the diya burn longer.
(C) Both equally
(D) Neither burns

Correct Answer: B

Explanation:

Option (b) is correct because the oil acts as fuel and helps the diya burn longer.

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Question (24)

QN0011296

In the diya activity, what acts as the fuel?

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

Correct Answer: C

Explanation:

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

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Question (25)

QN0011297

If Diya A contains 10 mL oil and Diya B contains 20 mL oil, which is expected to burn longer?

(A) Diya A
(B) is correct because a larger amount of fuel usually burns for a longer time.
(C) Both same
(D) Neither

Correct Answer: B

Explanation:

Option (b) is correct because a larger amount of fuel usually burns for a longer time.

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Question (26)

QN0011298

Which household device mainly uses electricity to create movement?

(A) is correct because a fan uses electricity to rotate and move air.
(B) Book
(C) Pencil
(D) Cup

Correct Answer: A

Explanation:

Option (a) is correct because a fan uses electricity to rotate and move air.

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Question (27)

QN0011299

Electricity can be used for

(A) movement only
(B) light only
(C) sound only
(D) is correct because electricity can produce movement, sound, light and heat.

Correct Answer: D

Explanation:

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

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Question (28)

QN0011300

Which action is safe while using electricity?

(A) Touching exposed wires
(B) Putting a stick into a socket
(C) is correct because broken wires should be reported to an adult for safety.
(D) Playing near transformers

Correct Answer: C

Explanation:

Option (c) is correct because broken wires should be reported to an adult for safety.

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Question (29)

QN0011301

If a child sees a fallen electric pole, what should be done?

(A) Touch it carefully
(B) Climb on it
(C) is correct because fallen electric poles can be dangerous.
(D) Pull the wires aside

Correct Answer: C

Explanation:

Option (c) is correct because fallen electric poles can be dangerous.

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Question (30)

QN0011302

Energy efficiency means

(A) using more energy for less work
(B) is correct because energy efficiency reduces energy use while doing the same work.
(C) avoiding all electricity
(D) storing energy only

Correct Answer: B

Explanation:

Option (b) is correct because energy efficiency reduces energy use while doing the same work.

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Question (21)

Which cooking fuel is commonly used in many homes?

Explanation:

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Question (22)

Why should wood and coal be used carefully?

Explanation:

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Question (23)

In the diya activity, which diya burns longer?

Explanation:

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Question (24)

In the diya activity, what acts as the fuel?

Explanation:

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Question (25)

If Diya A contains 10 mL oil and Diya B contains 20 mL oil, which is expected to burn longer?

Explanation:

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Question (26)

Which household device mainly uses electricity to create movement?

Explanation:

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Question (27)

Electricity can be used for

Explanation:

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Question (28)

Which action is safe while using electricity?

Explanation:

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Question (29)

If a child sees a fallen electric pole, what should be done?

Explanation:

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Question (30)

Energy efficiency means

Explanation:

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