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SAI International School
Class VII
Home Assignment
Subject: Physics
Ch- Electric current and simple circuit
Subtopic: Heating effects of Current

INSTRUCTIONS:
For Assertion& Reason question follow the following directions.
DIRECTION: Each of these questions contains an Assertion followed by Reason. Read them carefully
and answer the question on the basis of following options. You have to select the one that best describes
the two statements.
(a) If both Assertion and Reason are correct and Reason is the correct explanation of Assertion.
(b) If both Assertion and Reason are correct, but Reason is not the correct explanation of Assertion.
(c) If Assertion is correct but Reason is incorrect.
(d) If Assertion is incorrect but Reason is correct.
(e) If Assertion & Reason both are incorrect.

Any one option is correct. Marks
1. Which of the following appliances doesn’t works on the property heating effects 1
of current
a) Electric heater
b) Electric geyser
c) Electric bell
d) Electric iron

2. Which of the following factors affect the heating of conductor? 1
a) Cross-sectional area of conductor
b) Amount of current passing through conductor
c) Resistance of conductor
d) All of the above

3. Choose the reason for which copper not to be used as filament. 1
a) It has less resistance.
b) It has low melting point.
c) Both (a) and (b)
d) It has high melting point.

4. Assertion: CFLs are used more nowadays. 1
Reason: CFLs reduces wastage of electricity and saves money.

5. Assertion: Nichrome is a heating element. 1
Reason: Nichrome is an alloy of nickel and chromium.