Question

Assertion: The temperature of the surface of the sun is approximately $6000\, K$. If we take a big tens and focus the sun rays, we can produce a temperature of $8000\, K$.
Reason: This highest temperature can be produced according to second law of thermodynamics.

• A. If both Assertion and Reason are true and the Reason is the correct explanation of the Assertion
• B. If both Assertion and Reason are true but the Reason is not the correct explanation of the Assertion
• C. If Assertion is true but Reason is false
• D. If both Assertion and Reason are false

Answer 1

Answer: (D)

According to second law of thermodynamics, there is a net transfer of heat from a body at lower temperature to a body at higher temperature without the aid of an external agent. Since, the given information produces a contradiction in second law of thermodynamics, it is not possible to produce temperature of $8000\, K$ by collecting the sun rays with a lens.