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Question (31)

QN001941

Which of the following is an example of converting chemical energy into electrical energy?

(A) Electric iron heating
(B) Torch cell operating a bulb
(C) Compass deflection
(D) Magnet attracting pins

Correct Answer: B

Explanation:

Torch cells convert chemical energy into electrical energy.

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Question (32)

QN001942

A rechargeable battery is connected to a charger. During charging, electrical energy is mainly converted into

(A) magnetic energy
(B) sound energy
(C) stored chemical energy
(D) light energy only

Correct Answer: C

Explanation:

Charging stores electrical energy as chemical energy.

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Question (33)

QN001943

A student uses damaged cells in a toy car. The car runs very slowly because damaged cells

(A) supply less electrical energy
(B) increase magnetism only
(C) reduce resistance to zero
(D) produce oxygen continuously

Correct Answer: A

Explanation:

Weak cells cannot provide sufficient electrical energy.

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Question (34)

QN001944

Why are metals like zinc and copper commonly used in simple cells?

(A) They participate effectively in chemical reactions
(B) They are non-conductors
(C) They stop current flow
(D) They act as insulators

Correct Answer: A

Explanation:

Zinc and copper react suitably to generate electricity.

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Question (35)

QN001945

A student connects four cells randomly, and the bulb does not glow. The most likely reason is

(A) incorrect terminal connections
(B) excess oxygen in air
(C) bulb becoming magnetic
(D) wire resistance becoming zero

Correct Answer: A

Explanation:

Incorrect cell connections stop proper current flow.

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Question (36)

QN001946

Which observation best proves that a battery supplies electrical energy?

(A) A connected bulb glows
(B) A compass changes colour
(C) Plastic becomes soft
(D) Air temperature decreases

Correct Answer: A

Explanation:

Glowing bulb shows electrical energy is supplied.

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Question (37)

QN001947

Why are dry cells widely used in portable devices?

(A) They are compact and easy to carry
(B) They produce unlimited electricity
(C) They contain no chemicals
(D) They work without electrodes

Correct Answer: A

Explanation:

Dry cells are small, portable and convenient.

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Question (38)

QN001948

A battery connected to a circuit becomes weak after long use because

(A) stored chemical energy gets consumed
(B) wires absorb all electricity
(C) the bulb destroys the terminals
(D) resistance disappears completely

Correct Answer: A

Explanation:

Chemical energy inside the battery gets exhausted.

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Question (39)

QN001949

Which of the following correctly compares disposable and rechargeable batteries?

(A) Both are recharged equally
(B) Disposable cells can usually be used only once
(C) Rechargeable cells contain no electrolyte
(D) Disposable cells produce no current

Correct Answer: B

Explanation:

Disposable cells are generally meant for one-time use.

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Question (40)

QN001950

Scientists are developing better batteries mainly to

(A) reduce usefulness of portable devices
(B) improve energy storage and reduce pollution
(C) eliminate chemical reactions completely
(D) stop electricity generation in cells

Correct Answer: B

Explanation:

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Question (31)

Which of the following is an example of converting chemical energy into electrical energy?

Explanation:

Link:

Question (32)

A rechargeable battery is connected to a charger. During charging, electrical energy is mainly converted into

Explanation:

Link:

Question (33)

A student uses damaged cells in a toy car. The car runs very slowly because damaged cells

Explanation:

Link:

Question (34)

Why are metals like zinc and copper commonly used in simple cells?

Explanation:

Link:

Question (35)

A student connects four cells randomly, and the bulb does not glow. The most likely reason is

Explanation:

Link:

Question (36)

Which observation best proves that a battery supplies electrical energy?

Explanation:

Link:

Question (37)

Why are dry cells widely used in portable devices?

Explanation:

Link:

Question (38)

A battery connected to a circuit becomes weak after long use because

Explanation:

Link:

Question (39)

Which of the following correctly compares disposable and rechargeable batteries?

Explanation:

Link:

Question (40)

Scientists are developing better batteries mainly to

Explanation:

Link:

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