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Question (11)

QN0011403

A family uses 3 electric bulbs. If each bulb lights one room, how many rooms can be lit?

(A) 1
(B) 2
(C) is correct because 3 bulbs can light 3 rooms.
(D) 6

Correct Answer: C

Explanation:

Option (c) is correct because 3 bulbs can light 3 rooms.

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Question (12)

QN0011404

A house has 4 fans and 2 stop working. How many fans still operate using electricity?

(A) 1
(B) is correct because 4 − 2 = 2 fans.
(C) 4
(D) 6

Correct Answer: B

Explanation:

Option (b) is correct because 4 − 2 = 2 fans.

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Question (13)

QN0011405

A classroom has 8 bulbs. If 5 are switched on, how many remain switched off?

(A) 2
(B) is correct because 8 − 5 = 3 bulbs.
(C) 5
(D) 8

Correct Answer: B

Explanation:

Option (b) is correct because 8 − 5 = 3 bulbs.

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Question (14)

QN0011406

A television operates for 2 hours daily. How many hours will it operate in 5 days?

(A) 5
(B) 7
(C) is correct because 2 × 5 = 10 hours.
(D) 12

Correct Answer: C

Explanation:

Option (c) is correct because 2 × 5 = 10 hours.

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Question (15)

QN0011407

If a family uses 4 electric lamps every evening, how many lamps are used in 7 evenings?

(A) 11
(B) 21
(C) is correct because 4 × 7 = 28.
(D) 35

Correct Answer: C

Explanation:

Option (c) is correct because 4 × 7 = 28.

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Question (16)

QN0011408

Which source is commonly used to generate much of the electricity we use?

(A) is correct because coal is widely used for electricity generation.
(B) Cotton
(C) Paper
(D) Glass

Correct Answer: A

Explanation:

Option (a) is correct because coal is widely used for electricity generation.

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Question (17)

QN0011409

Most electricity generated by burning coal may cause

(A) is correct because burning coal releases pollutants.
(B) rainfall
(C) snowfall
(D) earthquakes

Correct Answer: A

Explanation:

Option (a) is correct because burning coal releases pollutants.

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Question (18)

QN0011410

Why is coal-based electricity a concern?

(A) is correct because coal burning causes air pollution.
(B) It creates food
(C) It increases oxygen only
(D) It produces no energy

Correct Answer: A

Explanation:

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

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Question (19)

QN0011411

Which action helps save electricity?

(A) Leaving lights on in an empty room
(B) is correct because it prevents wastage of electricity.
(C) Running all fans continuously
(D) Keeping televisions on all day

Correct Answer: B

Explanation:

Option (b) is correct because it prevents wastage of electricity.

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Question (20)

QN0011412

Energy-efficient appliances help by

(A) is correct because energy-efficient appliances consume less electricity.
(B) increasing pollution
(C) wasting energy
(D) producing smoke

Correct Answer: A

Explanation:

Option (a) is correct because energy-efficient appliances consume less electricity.

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Question (11)

A family uses 3 electric bulbs. If each bulb lights one room, how many rooms can be lit?

Explanation:

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Question (12)

A house has 4 fans and 2 stop working. How many fans still operate using electricity?

Explanation:

Link:

Question (13)

A classroom has 8 bulbs. If 5 are switched on, how many remain switched off?

Explanation:

Link:

Question (14)

A television operates for 2 hours daily. How many hours will it operate in 5 days?

Explanation:

Link:

Question (15)

If a family uses 4 electric lamps every evening, how many lamps are used in 7 evenings?

Explanation:

Link:

Question (16)

Which source is commonly used to generate much of the electricity we use?

Explanation:

Link:

Question (17)

Most electricity generated by burning coal may cause

Explanation:

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Question (18)

Why is coal-based electricity a concern?

Explanation:

Link:

Question (19)

Which action helps save electricity?

Explanation:

Link:

Question (20)

Energy-efficient appliances help by

Explanation:

Link:

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