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Question (1)

QN0031448

A village has abundant sunlight throughout the year. Which combination of activities can be carried out directly by using the Sun's energy without first converting it into electricity?

(A) Cooking in a solar cooker and drying grains
(B) Running a diesel pump and charging a battery
(C) Operating a petrol generator and cooking on LPG
(D) Running a coal-fired power plant and drying clothes

Correct Answer: A

Explanation:

Heat from the Sun can directly be used for drying materials and cooking in a solar cooker without converting it into electricity.

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Question (2)

QN0031449

A student observes the following: The tap is turned off while brushing. Rainwater is collected in a storage tank. Plastic waste is thrown into a nearby pond. Leaking pipes are repaired. Which option contains only the activities that help conserve usable freshwater?

(A) 1 and 2 only
(B) 1, 2 and 4 only
(C) 2 and 3 only
(D) 1, 3 and 4 only

Correct Answer: B

Explanation:

Turning off taps, repairing leaks and rainwater harvesting conserve water, while throwing plastic into ponds pollutes water.

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Question (3)

QN0031450

Air contains 78% nitrogen and 21% oxygen. If a hall contains about 5000 litres of air, approximately how much oxygen is present?

(A) 780 litres
(B) 1050 litres
(C) 2100 litres
(D) 3900 litres

Correct Answer: B

Explanation:

Oxygen = 21% of 5000 litres = (21 × 5000) ÷ 100 = 1050 litres.

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Question (4)

QN0031451

Four students make the following statements. P: Forests provide shelter to many animals. Q: Soil is formed by breaking down of rocks over a very long time. R: Fossil fuels can be replenished within a few years. S: Earthworms help loosen the soil. Which student has made an incorrect statement?

(A) P
(B) Q
(C) R
(D) S

Correct Answer: C

Explanation:

Fossil fuels require millions of years to form and cannot be replenished within a few years.

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Question (5)

QN0031452

A farmer removes all the trees around his field. After heavy rainfall, the top layer of soil is washed away. Which explains this best?

(A) Trees reduce sunlight reaching the soil.
(B) Roots of trees help hold soil together.
(C) Trees make soil heavier.
(D) Rain dissolves tree roots.

Correct Answer: B

Explanation:

Roots bind soil particles and reduce soil erosion during rainfall.

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Question (6)

QN0031453

Which sequence correctly shows how the Sun provides energy to a cow?

(A) Sun → Cow → Grass
(B) Sun → Grass → Cow
(C) Grass → Sun → Cow
(D) Cow → Sun → Grass

Correct Answer: B

Explanation:

Plants prepare food using sunlight, and the cow gets energy by eating the grass.

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Question (7)

QN0031454

A colony has 60 houses. If 45 houses install rainwater harvesting systems, what percentage of houses are harvesting rainwater?

(A) 65%
(B) 70%
(C) 75%
(D) 80%

Correct Answer: C

Explanation:

Percentage = (45 ÷ 60) × 100 = 75%.

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Question (8)

QN0031455

A mobile phone contains minerals such as gold, copper and silver. Which conclusion is most appropriate?

(A) Minerals are useful only for making jewellery.
(B) Minerals have no role in electronic devices.
(C) Minerals are important raw materials for many modern products.
(D) Mobile phones are renewable natural resources.

Correct Answer: C

Explanation:

Minerals are widely used in manufacturing electronic equipment, vehicles, jewellery and many other products.

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Question (9)

QN0031456

A family wants to reduce both air pollution and the use of fossil fuels while travelling short distances. Which is the best option?

(A) Use private diesel cars.
(B) Walk or use bicycles whenever possible.
(C) Keep vehicle engines running while waiting.
(D) Travel separately in different petrol cars.

Correct Answer: B

Explanation:

Walking and cycling require no fossil fuels and produce no air pollution.

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Question (10)

QN0031457

A school identifies the following resources: Air Coal Forest Petroleum Water How many of these are renewable natural resources?

(A) 2
(B) 3
(C) 4
(D) 5

Correct Answer: B

Explanation:

Renewable resources are air, forests and water. Coal and petroleum are non-renewable. Therefore, the total number of renewable resources is 3.

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Question (1)

A village has abundant sunlight throughout the year. Which combination of activities can be carried out directly by using the Sun's energy without first converting it into electricity?

Explanation:

Link:

Question (2)

A student observes the following: The tap is turned off while brushing. Rainwater is collected in a storage tank. Plastic waste is thrown into a nearby pond. Leaking pipes are repaired. Which option contains only the activities that help conserve usable freshwater?

Explanation:

Link:

Question (3)

Air contains 78% nitrogen and 21% oxygen. If a hall contains about 5000 litres of air, approximately how much oxygen is present?

Explanation:

Link:

Question (4)

Four students make the following statements. P: Forests provide shelter to many animals. Q: Soil is formed by breaking down of rocks over a very long time. R: Fossil fuels can be replenished within a few years. S: Earthworms help loosen the soil. Which student has made an incorrect statement?

Explanation:

Link:

Question (5)

A farmer removes all the trees around his field. After heavy rainfall, the top layer of soil is washed away. Which explains this best?

Explanation:

Link:

Question (6)

Which sequence correctly shows how the Sun provides energy to a cow?

Explanation:

Link:

Question (7)

A colony has 60 houses. If 45 houses install rainwater harvesting systems, what percentage of houses are harvesting rainwater?

Explanation:

Link:

Question (8)

A mobile phone contains minerals such as gold, copper and silver. Which conclusion is most appropriate?

Explanation:

Link:

Question (9)

A family wants to reduce both air pollution and the use of fossil fuels while travelling short distances. Which is the best option?

Explanation:

Link:

Question (10)

A school identifies the following resources: Air Coal Forest Petroleum Water How many of these are renewable natural resources?

Explanation:

Link:

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