Chapter 3: Thermal Physics — Online MCQ Test
SCIENCE · CLASS 10th · Tamil Nadu State Board
Practice Chapter 3: Thermal Physics with a free chapter-wise online MCQ test.
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....
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Chapter 3: Thermal Physics — Important Questions & Answers
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.
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.
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.
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:
- A. 8.31 J mol^-1 K^-1
- B. 1.38 × 10^-23 J K^-1
- C. 6.023 × 10^23 mol^-1
- D. 0.082 J mol^-1 K^-1
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.
The value of the Universal Gas Constant (R) is 8.31 J mol^-1 K^-1 in SI units.
The Boltzmann constant (kB) is related to the Universal Gas Constant (R) and Avogadro's number (NA) by which formula?
- A. kB = R × NA
- B. kB = R / NA
- C. kB = NA / R
- D. kB = 1 / (R × NA)
Answer: B. kB = R / NA
The Boltzmann constant is the gas constant per molecule, defined as kB = R / NA.
The Boltzmann constant is the gas constant per molecule, defined as kB = R / NA.