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Question (11)

QN0031758

Which of the following will NOT help in conserving groundwater?

(A) Building soak pits
(B) Planting more trees
(C) Covering open land with concrete
(D) Creating ponds

Correct Answer: C

Explanation:

Concrete surfaces prevent rainwater from soaking into the ground, reducing groundwater recharge.

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Question (12)

QN0031759

Meena keeps an ice cube on a plate. After some time, it melts into water. Later, the plate is kept in the hot sun until all the water disappears. Which sequence of changes has taken place?

(A) Solid → Liquid → Vapour
(B) Liquid → Solid → Vapour
(C) Vapour → Liquid → Solid
(D) Solid → Vapour → Liquid

Correct Answer: A

Explanation:

Ice first melts into water and then evaporates into water vapour.

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Question (13)

QN0031760

Four containers hold equal amounts of water. Container A is kept under a fan, Container B is covered with a lid, Container C is kept in bright sunlight and Container D is kept in a cool room. From which container will water evaporate the fastest?

(A) A
(B) B
(C) C
(D) D

Correct Answer: C

Explanation:

Bright sunlight provides maximum heat, increasing the rate of evaporation.

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Question (14)

QN0031761

A student observes tiny water droplets on the outside of a glass filled with ice cubes. These droplets are formed because—

(A) water leaks through the glass
(B) water vapour in the air cools and changes into liquid water
(C) the ice changes directly into vapour
(D) rainwater sticks to the glass

Correct Answer: B

Explanation:

Water vapour present in the air cools near the cold glass and condenses into liquid water droplets.

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Question (15)

QN0031762

Which of the following groups contains only freshwater sources?

(A) Ocean, sea, river
(B) Pond, lake, river
(C) Sea, pond, lake
(D) Ocean, lake, sea

Correct Answer: B

Explanation:

Rivers, ponds and lakes are freshwater sources, whereas seas and oceans contain saltwater.

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Question (16)

QN0031763

A river begins in the mountains and travels towards the plains. Along its journey it bends, slows down and changes direction. The main reason is—

(A) the colour of the soil
(B) the shape and slope of the land
(C) the size of the clouds
(D) the number of trees nearby

Correct Answer: B

Explanation:

Rivers flow according to the slope and shape of the land through which they pass.

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Question (17)

QN0031764

A pond contains lotus plants, reeds, fish, frogs and turtles. Which of the following is a plant found in this habitat?

(A) Freshwater turtle
(B) Frog
(C) Reeds
(D) Fish

Correct Answer: C

Explanation:

Reeds are tall plants that grow along the edges of ponds.

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Question (18)

QN0031765

A village receives 120 mm of rainfall every month for 4 months during the rainy season. What is the total rainfall received?

(A) 360 mm
(B) 420 mm
(C) 480 mm
(D) 520 mm

Correct Answer: C

Explanation:

Total rainfall = 120 × 4 = 480 mm.

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Question (19)

QN0031766

Which action will best protect the living organisms found in ponds and lakes?

(A) Throwing plastic waste into water
(B) Draining the pond completely every summer
(C) Keeping the water body clean and free from pollution
(D) Washing vehicles in the pond

Correct Answer: C

Explanation:

Clean and pollution-free water bodies provide a healthy habitat for aquatic plants and animals.

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Question (20)

QN0031767

A school plans to save water. Which combination of actions will be the most effective? P. Repair leaking taps. Q. Leave taps running while washing hands. R. Collect rainwater in a storage tank. S. Reuse water used for washing vegetables to water plants.

(A) P and Q only
(B) Q and R only
(C) P, R and S only
(D) P, Q, R and S

Correct Answer: C

Explanation:

Repairing leaks, harvesting rainwater and reusing water help conserve water, whereas leaving taps running wastes water.

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Question (11)

Which of the following will NOT help in conserving groundwater?

Explanation:

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Question (12)

Meena keeps an ice cube on a plate. After some time, it melts into water. Later, the plate is kept in the hot sun until all the water disappears. Which sequence of changes has taken place?

Explanation:

Link:

Question (13)

Four containers hold equal amounts of water. Container A is kept under a fan, Container B is covered with a lid, Container C is kept in bright sunlight and Container D is kept in a cool room. From which container will water evaporate the fastest?

Explanation:

Link:

Question (14)

A student observes tiny water droplets on the outside of a glass filled with ice cubes. These droplets are formed because—

Explanation:

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Question (15)

Which of the following groups contains only freshwater sources?

Explanation:

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Question (16)

A river begins in the mountains and travels towards the plains. Along its journey it bends, slows down and changes direction. The main reason is—

Explanation:

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Question (17)

A pond contains lotus plants, reeds, fish, frogs and turtles. Which of the following is a plant found in this habitat?

Explanation:

Link:

Question (18)

A village receives 120 mm of rainfall every month for 4 months during the rainy season. What is the total rainfall received?

Explanation:

Link:

Question (19)

Which action will best protect the living organisms found in ponds and lakes?

Explanation:

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Question (20)

A school plans to save water. Which combination of actions will be the most effective? P. Repair leaking taps. Q. Leave taps running while washing hands. R. Collect rainwater in a storage tank. S. Reuse water used for washing vegetables to water plants.

Explanation:

Link:

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