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Question (1)

QN0031868

A student blows air into a balloon and then releases it without tying the mouth. The balloon moves in the opposite direction of the escaping air. Which conclusion is best supported by this activity?

(A) Air has no effect on movement.
(B) Moving air can produce energy that causes motion.
(C) Balloons always move upward because they are light.
(D) The balloon moves because of gravity.

Correct Answer: B

Explanation:

Escaping air pushes the balloon forward, showing that moving air can produce motion.

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Question (2)

QN0031869

Four students perform the Sun-powered Water Warmer activity. Cup P is kept in sunlight for 20 minutes, Cup Q in shade for 20 minutes, Cup R in sunlight for 5 minutes and Cup S inside a cupboard. Which cup is expected to have the warmest water?

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

Correct Answer: C

Explanation:

Water kept in sunlight for the longest time absorbs the most heat energy.

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Question (3)

QN0031870

Which of the following situations correctly matches the source of energy with its use?

(A) Food → Lighting a bulb
(B) Petrol → Running a car
(C) Electricity → Growing plants
(D) Wind → Cooking food in an LPG stove

Correct Answer: B

Explanation:

Petrol is the fuel that provides energy for vehicles.

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Question (4)

QN0031871

Ravi switched on the fan, the LED bulb and the electric bell at home. These three appliances together show that electricity can produce

(A) only movement
(B) only heat
(C) movement, light and sound
(D) only light

Correct Answer: C

Explanation:

A fan gives movement, an LED gives light and a bell produces sound.

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Question (5)

QN0031872

A family replaces five old bulbs with LED bulbs that provide the same brightness while using less electricity. What is the main advantage of this change?

(A) LEDs increase pollution.
(B) LEDs use more electricity.
(C) LEDs improve energy efficiency.
(D) LEDs need fuel like petrol.

Correct Answer: C

Explanation:

Energy efficiency means doing the same work while using less energy.

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Question (6)

QN0031873

Observe the following actions: (1) A bird flying (2) A child running (3) A cow walking (4) A fish swimming. Which common source of energy makes all these actions possible?

(A) Electricity
(B) Food
(C) Coal
(D) Wind

Correct Answer: B

Explanation:

All living organisms obtain energy from the food they eat.

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Question (7)

QN0031874

A village has two methods of generating electricity: Method X burns coal and Method Y uses flowing river water. Which statement is correct?

(A) Both methods pollute the air equally.
(B) Method X is cleaner than Method Y.
(C) Method Y is a clean source of energy.
(D) Neither method can generate electricity.

Correct Answer: C

Explanation:

Electricity generated from flowing water is considered clean energy.

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Question (8)

QN0031875

During an experiment, four students try to light a diya. Diya P has only a wick, Diya Q has a wick and oil, Diya R has only oil and Diya S has neither wick nor oil. Which diya is expected to burn properly for the longest time?

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

Correct Answer: B

Explanation:

A diya burns properly only when both the wick and fuel (oil) are present.

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Question (9)

QN0031876

Which of the following is the safest action while using electricity?

(A) Putting a pencil inside a socket to check electricity.
(B) Touching a plugged-in wire with wet hands.
(C) Informing an adult after noticing a broken electric wire.
(D) Playing near an electric transformer.

Correct Answer: C

Explanation:

Broken wires are dangerous. Stay away and inform an adult immediately.

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Question (10)

QN0031877

A student makes a table showing different energy sources: Sun → Drying clothes, Wind → Turning a pinwheel, Flowing water → Rotating a water wheel, Coal → Producing clean energy without pollution. Which row contains incorrect information?

(A) Sun
(B) Wind
(C) Flowing water
(D) Coal

Correct Answer: D

Explanation:

Burning coal causes pollution and is not a clean source of energy.

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Question (1)

A student blows air into a balloon and then releases it without tying the mouth. The balloon moves in the opposite direction of the escaping air. Which conclusion is best supported by this activity?

Explanation:

Link:

Question (2)

Four students perform the Sun-powered Water Warmer activity. Cup P is kept in sunlight for 20 minutes, Cup Q in shade for 20 minutes, Cup R in sunlight for 5 minutes and Cup S inside a cupboard. Which cup is expected to have the warmest water?

Explanation:

Link:

Question (3)

Which of the following situations correctly matches the source of energy with its use?

Explanation:

Link:

Question (4)

Ravi switched on the fan, the LED bulb and the electric bell at home. These three appliances together show that electricity can produce

Explanation:

Link:

Question (5)

A family replaces five old bulbs with LED bulbs that provide the same brightness while using less electricity. What is the main advantage of this change?

Explanation:

Link:

Question (6)

Observe the following actions: (1) A bird flying (2) A child running (3) A cow walking (4) A fish swimming. Which common source of energy makes all these actions possible?

Explanation:

Link:

Question (7)

A village has two methods of generating electricity: Method X burns coal and Method Y uses flowing river water. Which statement is correct?

Explanation:

Link:

Question (8)

During an experiment, four students try to light a diya. Diya P has only a wick, Diya Q has a wick and oil, Diya R has only oil and Diya S has neither wick nor oil. Which diya is expected to burn properly for the longest time?

Explanation:

Link:

Question (9)

Which of the following is the safest action while using electricity?

Explanation:

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Question (10)

A student makes a table showing different energy sources: Sun → Drying clothes, Wind → Turning a pinwheel, Flowing water → Rotating a water wheel, Coal → Producing clean energy without pollution. Which row contains incorrect information?

Explanation:

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