Every Book Back multiple-choice question from Thermal Physics (10th Standard Science, Samacheer Kalvi) — each with the correct option highlighted and a clear, worked explanation. Free to read in English and Tamil.
Explanation. The universal gas constant \(R\) has a standard value of \(8.31\text{ J mol}^{-1}\text{ K}^{-1}\) in the SI system.
Q2
If a substance is heated or cooled, the change in mass of that substance is
A. positive
B. negative
C. zeroCorrect
D. none of the above
Explanation. According to the principle of conservation of mass, heating or cooling a substance changes its temperature or volume but does not alter its total mass. Thus, the change in mass is zero.
Q3
If a substance is heated or cooled, the linear expansion occurs along the axis of
A. X or -X
B. Y or -Y
C. both (a) and (b)
D. (a) or (b)Correct
Explanation. Linear expansion represents one-dimensional thermal expansion along a single line. Depending on how a substance is oriented in space, this expansion can occur along either the X-axis or the Y-axis.
Q4
Temperature is the average ___________ of the molecules of a substance
A. difference in K.E and P.E
B. sum of P.E and K.E
C. difference in T.E and P.ECorrect
D. difference in K.E and T.E
Explanation. Temperature measures the average kinetic energy of molecules. Since kinetic energy is total energy minus potential energy, temperature can be expressed as the average difference between total and potential energy.
Q5
In the given diagram, the possible direction of heat energy transformation is
A. A \leftarrow B, A \leftarrow C, B \leftarrow CCorrect
B. A \rightarrow B, A \rightarrow C, B \rightarrow C
C. A \rightarrow B, A \leftarrow C, B \rightarrow C
D. A \leftarrow B, A \rightarrow C, B \leftarrow C
Explanation. Heat flows naturally from a body at a higher temperature to one at a lower temperature until thermal equilibrium is reached.
These are the Book Back multiple-choice questions for Thermal Physics from the Tamil Nadu State Board (Samacheer Kalvi) 10th Standard Science syllabus. Each question shows the correct option and an original, step-by-step explanation so you understand the method, not just the answer. Use the answer key above to jump to any question, then take the practice test to check yourself under exam-like conditions.
Frequently asked questions
How many MCQs are there in Thermal Physics?
This chapter has 5 book-back multiple-choice questions, each with the correct answer and a step-by-step explanation.
Are these 10th Standard Science MCQs free to practise online?
Yes. Every question, answer and explanation here is free, and you can also take them as a timed practice test.
Where can I find the Thermal Physics book-back answers?
The correct option for each question is highlighted on this page with a worked explanation, plus a quick answer-key summary at the top.
