Assertion :While measuring the thermal conductivity of liquid experimentally, the upper layer is kept hot and the lower layer is kept cold. Reason: This avoids heating of liquid by convection.

Both Assertion and Reason are correct and Reason is the correct explanation for Assertion

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Both Assertion and Reason are correct but Reason is not the correct explanation for Assertion

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Assertion is correct but Reason is incorrect

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Both Assertion and Reason are incorrect

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Solution

The correct option is A Both Assertion and Reason are correct and Reason is the correct explanation for Assertion
$T o p r e v e n t c o n v e c t i o n i n l i q u i d w h i l e m e a s u r i n g t h e r m a l c o n d u c t i v i t y, t h e y m u s t b e h e a t e d f r o m t o p . H e n c e b o t h a s s e r t i o n a n d r e a s o n a r e t r u e a n d r e a s o n i s t h e c o r r e c t e x p l a i n a t i o n o f a s s e r t i o n .$

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Assertion :While measuring the thermal conductivity of liquid experimentally, the upper layer is kept hot and the lower layer is kept cold. Reason: This avoids heating of liquid by convection.

The correct option is A Both Assertion and Reason are correct and Reason is the correct explanation for AssertionTopreventconvectioninliquidwhilemeasuringthermalconductivity,theymustbeheatedfromtop.Hencebothassertionandreasonaretrueandreasonisthecorrectexplainationofassertion.