Give any 20 assertion and reason questions for class 7 science cbse electric current and its effects.
Answers
Explanation:
Tungsten metal is used for making filaments of incandescent lamps.
Longer wires have greater resistance and the smaller wires have lesser resistance
If a graph is plotted between the potential difference and the current flowing,the graph is a straight line passing through the origin.
When the resistances are connected end-to-end consecutively, they are said to
be in series.
Answer: Here are some questions of assertion and reason of chapter electric current and its effects for class 7.
Explanation:1.) Assertion- when a electric current flows through a wire , it behaves like a magnet.
Reason- magnetic field is perpendicular to the direction of current flow.
a) Assertion and reason both are correct statement and reason is correct explanation for assertion.
b) Assertion and reason both are correct statement and reason is not correct explanation for assertion.
c) Assertion is correct statement but reason is wrong statement.
d) Assertion is wrong statement but reason is correct statement.
Ans- option A
2.) Assertion- amount of heat produced in a wire depends on its material , length and thickness.
Reason- resistance is directly proportional to the area of cross section and inversely proportional to length of conductor.
a) Assertion and reason both are correct statement and reason is correct explanation for assertion.
b) Assertion and reason both are correct statement and reason is not correct explanation for assertion.
c) Assertion is correct statement but reason is wrong statement.
d) Assertion is wrong statement but reason is correct statement
Ans- option C
3.) Assertion- wire used for making electric circuit normally become hot.
Reason- there is due to heating effect of the electric current.
a) Assertion and reason both are correct statement and reason is correct explanation for assertion.
b) Assertion and reason both are correct statement and reason is not correct explanation for assertion.
c) Assertion is correct statement but reason is wrong statement.
d) Assertion is wrong statement but reason is correct statement.
Ans- option D
To know more about electric current from the given link
https://brainly.in/question/508040
To know more about resistance from the given link
https://brainly.in/question/29795
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