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Question (11)

QN001891

Why should the nichrome wire not be touched for a long time during the activity?

(A) It may break instantly
(B) It may give electric shock always
(C) It may cause burns due to heating
(D) It becomes magnetic permanently

Correct Answer: C

Explanation:

Heated wire may cause burns.

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Question (12)

QN001892

An incandescent lamp glows because its filament

(A) becomes magnetic
(B) gets heated by electric current
(C) stores electricity
(D) produces sound energy

Correct Answer: B

Explanation:

Filament glows when heated by electric current.

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Question (13)

QN001893

Which household appliance mainly works on heating effect of electric current?

(A) Magnetic compass
(B) Electric iron
(C) Electromagnetic crane
(D) Bar magnet

Correct Answer: B

Explanation:

Electric iron uses heating effect of current.

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Question (14)

QN001894

An electric room heater produces heat because current flows through a

(A) magnetic compass
(B) heating element
(C) permanent magnet
(D) carbon rod only

Correct Answer: B

Explanation:

Heating element becomes hot due to current flow.

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Question (15)

QN001895

The coil or rod inside heating appliances that gets heated is called

(A) conductor cap
(B) heating element
(C) electrolyte
(D) electrode

Correct Answer: B

Explanation:

Heating appliances contain heating elements.

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Question (16)

QN001896

In some electrical appliances, the heating element glows red hot because

(A) it becomes magnetised
(B) it produces excessive light only
(C) it becomes highly heated by current
(D) it absorbs heat from surroundings

Correct Answer: C

Explanation:

Strong heating causes the element to glow red hot.

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Question (17)

QN001897

Which of the following appliances does NOT mainly use heating effect of electric current?

(A) Electric kettle
(B) Hair dryer
(C) Electric stove
(D) Magnetic compass

Correct Answer: D

Explanation:

Magnetic compass works on magnetic effect, not heating effect.

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Question (18)

QN001898

Why is nichrome preferred in electric heating appliances?

(A) It is an insulator
(B) It has higher resistance
(C) It melts very quickly
(D) It produces no heat

Correct Answer: B

Explanation:

Higher resistance helps nichrome produce more heat.

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Question (19)

QN001899

A student observes that a wire connected to two cells becomes hotter than with one cell for the same duration. This is because

(A) current is larger with two cells
(B) resistance disappears
(C) wire thickness increases
(D) magnetic field becomes weaker

Correct Answer: A

Explanation:

Larger current produces more heating effect.

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Question (20)

QN001900

Which factor will increase the heat generated in a conductor?

(A) Decreasing current completely
(B) Reducing time of current flow to zero
(C) Increasing current through the conductor
(D) Removing the conductor from circuit

Correct Answer: C

Explanation:

Greater current increases heat production.

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Question (11)

Why should the nichrome wire not be touched for a long time during the activity?

Explanation:

Link:

Question (12)

An incandescent lamp glows because its filament

Explanation:

Link:

Question (13)

Which household appliance mainly works on heating effect of electric current?

Explanation:

Link:

Question (14)

An electric room heater produces heat because current flows through a

Explanation:

Link:

Question (15)

The coil or rod inside heating appliances that gets heated is called

Explanation:

Link:

Question (16)

In some electrical appliances, the heating element glows red hot because

Explanation:

Link:

Question (17)

Which of the following appliances does NOT mainly use heating effect of electric current?

Explanation:

Link:

Question (18)

Why is nichrome preferred in electric heating appliances?

Explanation:

Link:

Question (19)

A student observes that a wire connected to two cells becomes hotter than with one cell for the same duration. This is because

Explanation:

Link:

Question (20)

Which factor will increase the heat generated in a conductor?

Explanation:

Link:

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