Chapter Exam

Chapter 3: Thermal Physics — Online MCQ Test

Q: What is the SI unit of temperature?

Answer: C. Kelvin — The SI unit of temperature is Kelvin (K). Heat energy is measured in Joules.

Q: Absolute zero temperature on the Celsius scale is equal to:

Answer: C. -273.15 °C — Absolute zero (0 K) corresponds to -273.15 °C, where molecular motion practically ceases.

Q: In the ideal gas equation PV = nRT, the constant 'R' represents the Universal Gas Constant. Its value in SI units is:

Answer: A. 8.31 J mol^-1 K^-1 — The value of the Universal Gas Constant (R) is 8.31 J mol^-1 K^-1 in SI units.

Q: The Boltzmann constant (kB) is related to the Universal Gas Constant (R) and Avogadro's number (NA) by which formula?

Answer: B. kB = R / NA — The Boltzmann constant is the gas constant per molecule, defined as kB = R / NA.

SCIENCE · CLASS 10th · Tamil Nadu State Board

Practice Chapter 3: Thermal Physics with a free chapter-wise online MCQ test for Tamil Nadu State Board CLASS 10th SCIENCE. This chapter covers: This chapter covers heat energy temperature scales thermal expansion and fundamental gas laws including Boyle Law and Charles Law. Students study absolute temperature and thermal e.... AI-generated questions from basic to board-exam level, with instant results and explanations.

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Chapter 3: Thermal Physics — Important Questions & Answers (FAQ)

Frequently asked questions from Tamil Nadu State Board CLASS 10th SCIENCE — Chapter 3: Thermal Physics, with answers and explanations. These are sample questions; the exam has its own separate question set.

What is the SI unit of temperature?

A. Degree Celsius
B. Fahrenheit
C. Kelvin ✓
D. Joule

Answer: C. Kelvin
The SI unit of temperature is Kelvin (K). Heat energy is measured in Joules.

Absolute zero temperature on the Celsius scale is equal to:

A. 0 °C
B. 100 °C
C. -273.15 °C ✓
D. -100 °C

Answer: C. -273.15 °C
Absolute zero (0 K) corresponds to -273.15 °C, where molecular motion practically ceases.

For a given liquid heated in a container, which of the following statements regarding its thermal expansion is correct?

A. Real expansion is equal to apparent expansion.
B. Apparent expansion is always greater than real expansion.
C. Real expansion is always greater than apparent expansion. ✓
D. Real expansion is independent of the liquid's temperature.

Answer: C. Real expansion is always greater than apparent expansion.
Real expansion includes the expansion of the container as well as the apparent expansion of the liquid, so real expansion is always greater than apparent expansion.

In the ideal gas equation PV = nRT, the constant 'R' represents the Universal Gas Constant. Its value in SI units is: