JEE PYQ: Magnetic Effects Of Current Question 8
Question 8 - 2021 (25 Feb 2021 Shift 1)
Given below are two statements: one is labelled as Assertion A and the other is labelled as Reason R. Assertion A: When a rod lying freely is heated, no thermal stress is developed in it. Reason R: On heating, the length of the rod increases. In the light of the above statements, choose the correct answer from the options given below:
(1) A is true but R is false
(2) Both A and R are true and R is the correct explanation of A
(3) Both A and R are true but R is NOT the correct explanation of A
(4) A is false but R is true
Show Answer
Answer: (3) Both A and R are true but R is NOT the correct explanation of A
Solution
When a rod is free and it is heated then there is no thermal stress produced in it. The rod will expand due to increase in temperature, so both A and R are true. But R is not the correct explanation of A.
BETA
