NEETPhysicsThermal Properties of Matter
Assertion (A) Rapidly changing temperatures can be measured by thermocouples. Reason (R) The thermal capacity of the junction of a thermocouple is very small.
Options
- ABoth (A) and (R) are true and (R) is not the correct explanation of (A)
- BBoth (A) and (R) are true but (R) is not the correct explanation of (A)
- C(A) is true but (R) is false
- D(A) is false but (R) is true
Correct answer
A. Both (A) and (R) are true and (R) is not the correct explanation of (A)
Step-by-step solution
Assertion (A): Rapidly changing temperatures can be measured by thermocouples. → ✅ True (thermocouples respond quickly to temperature changes). Reason (R): The thermal capacity of the junction of a thermocouple is very small. → ✅ True (small mass and heat capacity ensure fast response). The reason is the correct explanation of the assertion. ✔ Correct Answer: (2) Both A and R are true and R is the correct explanation of A.