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Physics Question 26 – JEE-MAIN 2025

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Match List - I with List - II. List - IList - II(A) Heat capacity of body(I) J kg−1(B) Specific heat capacity of body(II) J K−1(C) Latent heat(III) J kg−1 K−1(D) Thermal conductivity(IV) J m−1 K−1 s−1 Choose the correct answer from the options given below :

Recall the definitions of heat capacity, specific heat capacity, latent heat, and thermal conductivity.

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Ninja Strategy•Unit of Heat Capacity

By correctly identifying the unit for Heat Capacity (A) as J K−1 (II), options 1, 2, and 3 can be immediately eliminated, leaving option 4 as the only possible correct answer.

Step 1: Recall Definitions and Formulas✦ Active

We need to recall the definitions and corresponding formulas for each physical quantity listed in List-I to determine their SI units.

(A) Heat capacity (C):C=QΔT(B) Specific heat capacity (c):c=QmΔT(C) Latent heat (L):L=Qm(D) Thermal conductivity (k):From Fourier's Law, Q=−kAdTdxt⟹k=QAdTdxt
Step 2: Determine Units for Each Quantity○ Expand

Using the SI units for energy (J), mass (kg), temperature (K), length (m), and time (s), we derive the units for each quantity:

(A) Heat capacity:JK=J K−1 (Matches List-II (II))(B) Specific heat capacity:Jkg⋅K=J kg−1 K−1 (Matches List-II (III))(C) Latent heat:Jkg=J kg−1 (Matches List-II (I))(D) Thermal conductivity:Jm2⋅(K/m)⋅s=Jm⋅K⋅s=J m−1 K−1 s−1 (Matches List-II (IV))
💡 Teacher's Secret Hint

Pay close attention to the negative exponent notation for units.

Step 3: Match and Select the Correct Option○ Expand

Based on the unit derivations, the correct matches are: (A) - (II) (B) - (III) (C) - (I) (D) - (IV) Comparing this with the given options, option 4 is the correct choice.

💡 Teacher's Secret Hint

Double-check each individual match before selecting the final option.

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