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Question (1)

QN0031768

A river begins as a small stream in the mountains. As it flows downhill, several smaller streams join it. What is the most likely effect of this?

(A) The river becomes shorter.
(B) The river becomes wider and carries more water.
(C) The river changes into a lake.
(D) The river stops flowing during summer.

Correct Answer: B

Explanation:

Tributaries join the main river, increasing its volume and width.

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Question (2)

QN0031769

A farmer has two fields. One is near a perennial river and the other is near a seasonal river. During a long dry season, which field is more likely to receive water for irrigation?

(A) The field near the seasonal river
(B) Both fields equally
(C) The field near the perennial river
(D) Neither field

Correct Answer: C

Explanation:

Perennial rivers flow throughout the year, so they provide water even during dry seasons.

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Question (3)

QN0031770

Which of the following is the best example of a tributary?

(A) A canal carrying water from a dam
(B) A small stream joining a larger river
(C) Rainwater collected in a pond
(D) A lake connected to the sea

Correct Answer: B

Explanation:

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

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Question (4)

QN0031771

A village gets drinking water, irrigation water and electricity from a nearby dam. If the dam receives very little rainfall for two consecutive years, which problem is most likely to occur first?

(A) Increased fish migration
(B) Shortage of water and electricity
(C) Formation of a new delta
(D) Increase in mangrove forests

Correct Answer: B

Explanation:

Less rainfall reduces reservoir water, affecting both water supply and hydroelectric power generation.

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Question (5)

QN0031772

Which of the following correctly explains why many ancient settlements developed near rivers?

(A) Rivers prevented earthquakes.
(B) Rivers provided water, fertile land and transport.
(C) Rivers produced minerals directly.
(D) Rivers reduced the temperature throughout the year.

Correct Answer: B

Explanation:

Rivers supported agriculture, transport, drinking water and daily life.

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Question (6)

QN0031773

A factory starts releasing untreated waste into a river. Which effect is most likely to happen first?

(A) Fish population increases rapidly.
(B) Water becomes polluted and aquatic life is affected.
(C) The river becomes deeper.
(D) Floods stop occurring.

Correct Answer: B

Explanation:

Untreated industrial waste pollutes water and harms aquatic life.

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Question (7)

QN0031774

A student observes that a river is almost completely covered by a thick green layer of plants. What is the most likely reason?

(A) Excess fertilisers entered the river.
(B) Too many boats were used.
(C) Heavy snowfall occurred upstream.
(D) The river became saltier.

Correct Answer: A

Explanation:

Fertilisers promote excessive growth of aquatic plants, forming a green blanket.

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Question (8)

QN0031775

Which action would help reduce river pollution the most?

(A) Throwing biodegradable waste into rivers
(B) Burning plastic near river banks
(C) Treating sewage before releasing it into rivers
(D) Washing vehicles directly in rivers

Correct Answer: C

Explanation:

Treating sewage removes harmful pollutants before the water enters rivers.

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Question (9)

QN0031776

During heavy rainfall, a forested area experiences less flooding than a nearby area where most trees have been cut. What is the best explanation?

(A) Trees increase river pollution.
(B) Trees help the soil absorb rainwater.
(C) Trees increase the speed of flowing water.
(D) Trees prevent rainfall.

Correct Answer: B

Explanation:

Tree roots help rainwater soak into the soil, reducing runoff and flooding.

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Question (10)

QN0031777

A family receives a warning that their village may soon be flooded. Which action should they take first?

(A) Wait until floodwater enters the house.
(B) Move to higher ground following official instructions.
(C) Cross the flooded road quickly.
(D) Continue using electrical appliances.

Correct Answer: B

Explanation:

People should move to safer, higher places immediately after receiving flood warnings.

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Question (1)

A river begins as a small stream in the mountains. As it flows downhill, several smaller streams join it. What is the most likely effect of this?

Explanation:

Link:

Question (2)

A farmer has two fields. One is near a perennial river and the other is near a seasonal river. During a long dry season, which field is more likely to receive water for irrigation?

Explanation:

Link:

Question (3)

Which of the following is the best example of a tributary?

Explanation:

Link:

Question (4)

A village gets drinking water, irrigation water and electricity from a nearby dam. If the dam receives very little rainfall for two consecutive years, which problem is most likely to occur first?

Explanation:

Link:

Question (5)

Which of the following correctly explains why many ancient settlements developed near rivers?

Explanation:

Link:

Question (6)

A factory starts releasing untreated waste into a river. Which effect is most likely to happen first?

Explanation:

Link:

Question (7)

A student observes that a river is almost completely covered by a thick green layer of plants. What is the most likely reason?

Explanation:

Link:

Question (8)

Which action would help reduce river pollution the most?

Explanation:

Link:

Question (9)

During heavy rainfall, a forested area experiences less flooding than a nearby area where most trees have been cut. What is the best explanation?

Explanation:

Link:

Question (10)

A family receives a warning that their village may soon be flooded. Which action should they take first?

Explanation:

Link:

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