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Question (11)

QN0031778

A town depends mainly on a nearby river for its drinking water. Which habit of the residents will help ensure clean water in the future?

(A) Throwing household waste into drains
(B) Using eco-friendly cleaning products and reducing waste
(C) Washing vehicles directly in the river
(D) Dumping plastic on riverbanks

Correct Answer: B

Explanation:

Eco-friendly products and reduced waste help prevent river pollution.

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Question (12)

QN0031779

Which pair is correctly matched?

(A) Delta — Place where a river begins
(B) Tributary — Small stream joining a larger river
(C) Reservoir — River flowing into the sea
(D) Dam — Natural waterfall

Correct Answer: B

Explanation:

A tributary is a smaller stream or river that joins a larger river.

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Question (13)

QN0031780

A village receives unusually heavy rainfall. Which sequence is most likely to occur?

(A) River level falls → Crops improve → Water shortage
(B) River overflows → Flooding → Damage to homes and roads
(C) River dries up → Migration begins → Fish increase
(D) River changes into a lake → Delta disappears

Correct Answer: B

Explanation:

Heavy rainfall causes rivers to overflow, leading to floods and damage.

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Question (14)

QN0031781

During a flood, which activity should be strictly avoided?

(A) Moving to higher ground
(B) Following evacuation instructions
(C) Walking or driving through floodwater
(D) Keeping an emergency kit ready

Correct Answer: C

Explanation:

Floodwater may be deep, contaminated or fast-moving, making it dangerous.

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Question (15)

QN0031782

Which situation best shows the importance of conserving water?

(A) A city receives rainfall every day.
(B) A river flows only during festivals.
(C) A region faces a long dry period and water becomes scarce.
(D) A lake becomes deeper during winter.

Correct Answer: C

Explanation:

Water conservation is essential during periods of water scarcity.

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Question (16)

QN0031783

A student turns off the tap while brushing teeth, repairs leaking taps, and reuses water used for washing vegetables to water plants. What is the combined benefit of these actions?

(A) They increase flood risk.
(B) They reduce unnecessary water wastage.
(C) They pollute groundwater.
(D) They increase river pollution.

Correct Answer: B

Explanation:

These simple habits help conserve water and reduce wastage.

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Question (17)

QN0031784

Why do fish and other aquatic animals suffer when harmful chemicals enter a river, even if the water appears clean?

(A) Harmful substances may dissolve and remain invisible.
(B) Chemicals immediately evaporate.
(C) Fish can live only in muddy water.
(D) Clean-looking water always contains more oxygen.

Correct Answer: A

Explanation:

Many pollutants dissolve in water and cannot be seen, yet they harm aquatic life.

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Question (18)

QN0031785

Which of the following would most likely happen if all the trees along a riverbank were removed?

(A) Less soil erosion and less flooding
(B) More runoff, soil erosion and greater flood risk
(C) More groundwater recharge only
(D) Increase in mangrove forests

Correct Answer: B

Explanation:

Trees reduce runoff and hold soil together, helping prevent erosion and floods.

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Question (19)

QN0031786

A city experiences rapid population growth, increasing the demand for river water. Which is the best long-term solution?

(A) Waste more water during the rainy season.
(B) Use water wisely and prevent river pollution.
(C) Build houses in the middle of the river.
(D) Dispose of garbage in nearby streams.

Correct Answer: B

Explanation:

Sustainable use and pollution control help ensure future water availability.

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Question (20)

QN0031787

Which statement best summarizes the central message of the chapter?

(A) Rivers are useful only for transportation.
(B) Rivers should be controlled completely by dams.
(C) Rivers support life, and everyone has a responsibility to protect and conserve them.
(D) Rivers are important only during the rainy season.

Correct Answer: C

Explanation:

The chapter emphasizes that rivers support life and must be protected through responsible human actions.

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Question (11)

A town depends mainly on a nearby river for its drinking water. Which habit of the residents will help ensure clean water in the future?

Explanation:

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Question (12)

Which pair is correctly matched?

Explanation:

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Question (13)

A village receives unusually heavy rainfall. Which sequence is most likely to occur?

Explanation:

Link:

Question (14)

During a flood, which activity should be strictly avoided?

Explanation:

Link:

Question (15)

Which situation best shows the importance of conserving water?

Explanation:

Link:

Question (16)

A student turns off the tap while brushing teeth, repairs leaking taps, and reuses water used for washing vegetables to water plants. What is the combined benefit of these actions?

Explanation:

Link:

Question (17)

Why do fish and other aquatic animals suffer when harmful chemicals enter a river, even if the water appears clean?

Explanation:

Link:

Question (18)

Which of the following would most likely happen if all the trees along a riverbank were removed?

Explanation:

Link:

Question (19)

A city experiences rapid population growth, increasing the demand for river water. Which is the best long-term solution?

Explanation:

Link:

Question (20)

Which statement best summarizes the central message of the chapter?

Explanation:

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