1. Which of the following does NOT depend on the temperature of the substance?
Answer:
Explanation:
Thermal conductivity of a material is a measure of its ability to conduct heat and is generally independent of its temperature.
2. Which law states that the pressure of a given mass of gas is directly proportional to its absolute temperature when the volume is kept constant?
Answer:
Explanation:
Charles' Law (or volume law) states that volume of a gas is directly proportional to its absolute temperature, keeping the pressure constant. However, when volume is constant, it is also termed as Gay-Lussac's Law.
3. The coefficient of volume expansion is equal to _______ times the coefficient of linear expansion.
Answer:
Explanation:
Coefficient of volume expansion (β) is approximately three times the coefficient of linear expansion (α) for solids.
4. A bimetallic strip is made of aluminum and brass. On heating, it will:
Answer:
Explanation:
Aluminum has a higher coefficient of linear expansion than brass. Therefore, upon heating, aluminum will expand more, causing the strip to bend with aluminum on the outer side.
5. Which of the following substances has the maximum specific heat?
Answer:
Explanation:
Among the given substances, water has the highest specific heat.
6. If two objects are in thermal equilibrium with a third object, they are in thermal equilibrium with each other. This statement is:
Answer:
Explanation:
The stated principle is known as the Zeroth law of thermodynamics.
7. In an adiabatic process:
Answer:
Explanation:
An adiabatic process is one in which no heat enters or leaves the system.
8. Which of the following is NOT a good conductor of heat?
Answer:
Explanation:
Wood is an insulator and does not conduct heat effectively.
9. The S.I. unit of thermal conductivity is:
Answer:
Explanation:
The S.I. unit of thermal conductivity is Watts per meter Kelvin (W/m.K) or W/m.°C.
10. An ideal gas undergoes isothermal expansion. This means the gas:
Answer:
Explanation:
Isothermal means constant temperature. Thus, during isothermal expansion, the temperature of the gas remains constant.
11. Calorimetry is the science associated with:
Answer:
Explanation:
Calorimetry deals with the measurements and study of heat changes during physical or chemical processes.
12. Latent heat of fusion is the heat required to:
Answer:
Explanation:
Latent heat of fusion is the heat needed to change a substance from solid to liquid phase at its melting point without any change in temperature.
13. Which of the following does NOT affect the thermal resistance of a material?
Answer:
Explanation:
Thermal resistance depends on the physical properties and dimensions of the material, not on its color.
14. The heat capacity of a system which has entropy of zero at absolute zero temperature is:
Answer:
Explanation:
According to the third law of thermodynamics, the heat capacity of a system becomes zero as the temperature approaches absolute zero.
15. In an isobaric process:
Answer:
Explanation:
An isobaric process is one in which the pressure remains constant.