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Question (11)

QN001921

A student connects two dry cells in series to a bulb. Compared to one cell, the bulb will generally glow

(A) dimmer
(B) brighter
(C) only for a second
(D) without current

Correct Answer: B

Explanation:

Two cells provide greater electrical energy.

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Question (12)

QN001922

Why does connecting more cells in series increase bulb brightness?

(A) Total current supplied becomes larger
(B) Resistance becomes zero
(C) Bulb filament disappears
(D) Chemical reactions stop

Correct Answer: A

Explanation:

More cells increase the electrical supply to the bulb.

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Question (13)

QN001923

If the terminals of a cell are reversed while connecting an LED, the LED may not glow because

(A) LED works only in one direction
(B) the cell loses all energy
(C) current becomes magnetic
(D) electrolyte freezes immediately

Correct Answer: A

Explanation:

LEDs allow current flow only in one direction.

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Question (14)

QN001924

Rechargeable batteries are preferred in many devices because they

(A) never lose charge
(B) can be used repeatedly after charging
(C) produce electricity without chemicals
(D) have no terminals

Correct Answer: B

Explanation:

Rechargeable batteries can be charged and reused.

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Question (15)

QN001925

A mobile phone battery needs replacement after many years mainly because

(A) its chemicals slowly lose effectiveness
(B) its plastic body melts
(C) magnets inside it weaken
(D) current becomes permanent

Correct Answer: A

Explanation:

Battery chemicals lose efficiency after repeated use.

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Question (16)

QN001926

Which of the following devices generally uses rechargeable batteries?

(A) TV remote only
(B) Wall clock only
(C) Mobile phone
(D) Matchbox torch only

Correct Answer: C

Explanation:

Mobile phones commonly use rechargeable batteries.

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Question (17)

QN001927

In a simple cell, electricity stops flowing after some time mainly because

(A) chemical reactants get used up
(B) the wire becomes magnetic
(C) the bulb changes colour
(D) the circuit loses resistance completely

Correct Answer: A

Explanation:

Chemical reactants are gradually consumed.

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Question (18)

QN001928

Which statement correctly explains how a battery generates electricity?

(A) Mechanical energy changes directly into sound
(B) Chemical energy changes into electrical energy
(C) Heat energy changes into magnetic energy
(D) Electrical energy changes into chemical energy only

Correct Answer: B

Explanation:

Batteries convert chemical energy into electrical energy.

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Question (19)

QN001929

A student connects three identical cells correctly in series. The circuit will generally have

(A) greater electrical energy supply
(B) zero current
(C) no voltage
(D) weaker chemical reactions

Correct Answer: A

Explanation:

Series connection increases total electrical energy supplied.

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Question (20)

QN001930

Which part of a dry cell contains chemicals that participate in reactions?

(A) Electrolyte and electrodes
(B) Plastic cover only
(C) Bulb holder
(D) Switch only

Correct Answer: A

Explanation:

Electrodes and electrolyte take part in chemical reactions.

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Question (11)

A student connects two dry cells in series to a bulb. Compared to one cell, the bulb will generally glow

Explanation:

Link:

Question (12)

Why does connecting more cells in series increase bulb brightness?

Explanation:

Link:

Question (13)

If the terminals of a cell are reversed while connecting an LED, the LED may not glow because

Explanation:

Link:

Question (14)

Rechargeable batteries are preferred in many devices because they

Explanation:

Link:

Question (15)

A mobile phone battery needs replacement after many years mainly because

Explanation:

Link:

Question (16)

Which of the following devices generally uses rechargeable batteries?

Explanation:

Link:

Question (17)

In a simple cell, electricity stops flowing after some time mainly because

Explanation:

Link:

Question (18)

Which statement correctly explains how a battery generates electricity?

Explanation:

Link:

Question (19)

A student connects three identical cells correctly in series. The circuit will generally have

Explanation:

Link:

Question (20)

Which part of a dry cell contains chemicals that participate in reactions?

Explanation:

Link:

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