MCQ practice · SSC Physics Board questions · Chapter 6: Effects of Heat on Matter
Which is the unit of specific heat?
Think it through first, then pick an option.
- a Jkg⁻²K⁻¹
- b Jkg⁻¹K⁻²
- c Jkg⁻²K⁻¹
- d Jkg⁻¹K⁻¹
Answer and explanation
Correct answer: d Jkg⁻¹K⁻¹
Specific heat = Q/(mΔT), so its unit is J kg⁻¹ K⁻¹.
Why the other options are wrong
- a Jkg⁻²K⁻¹: The kg⁻² is wrong; specific heat = Q/(mΔT), so the mass sits in the denominator to the first power only: kg⁻¹.
- b Jkg⁻¹K⁻²: The kg⁻¹ is right but the power of temperature is wrong; ΔT divides once, so K⁻¹.
- c Jkg⁻²K⁻¹: Same as option a (the paper prints the two alike), and wrong for the same reason: the mass power is kg⁻¹, not kg⁻².
Your account is open, so all 30,000+ MCQs from every chapter are yours. Start practising SSC Physics →
Want to keep going?
A free account carries you on to the next questions and opens 30,000+ MCQs from every chapter. Join before launch and Chirkut bundles are 60% off.
The ones you missed, worth one more look