Free Thermodynamics MCQs with Answers

• A. double
• B. one half
• C. four times
• D. one fourth

Explanation: Boyle's law at constant temperature states PV = constant, so P1V1 = P2V2.

• A. 460°C
• B. 280°C
• C. 360°C
• D. 160°C

Explanation: Use F = (9/5)C + 32 and set the Fahrenheit reading equal to twice the Celsius reading: 2C = (9/5)C + 32, so (1/5)C = 32 and C = 160°C.

• A. 76cm 0°C
• B. 760mm 273K
• C. 1atm 273K
• D. all of the aboveTracking Hyperlocal Weather Forecasts

Explanation: These are equivalent descriptions of standard temperature and pressure: 76 cm Hg = 760 mm Hg = 1 atm, and 0°C = 273 K.

• A. One degree of Fahrenheit scale
• B. 1.8 degrees of Fahrenheit scale
• C. 3.2 degrees of Fahrenheit scale
• D. 2.12 degrees of Fahrenheit scale

Explanation: The interval conversion is ΔF = (9/5)ΔC. Hence, a change of 1°C corresponds to (9/5) × 1 = 1.8°F, so it is 1.8 degrees on the Fahrenheit…

• A. 37°C
• B. 42°C
• C. 55°C
• D. 410°C

Explanation: Convert using C = (5/9)(F - 32): C = (5/9)(98.6°F - 32°F) = (5/9)(66.6°F) = 37°C. Thus normal body temperature is approximately 37°C.

• A. 1.38 x 10^-31JK-1
• B. 3.18 x 10^-31JK-1
• C. 3.18 x 10^-23JK-1
• D. 1.38 x 10^-23JK-1

Explanation: Boltzmann's constant has the value k = 1.38 x 10^-23 J K^-1, linking temperature with the energy of individual particles.

• A. Over a wide range of temperature its expansion is uniform
• B. It does not stick to thermometer glass
• C. It opaque to light
• D. All of above

Explanation: Mercury is useful in thermometers because it expands nearly uniformly over a useful temperature range, does not wet or stick to glass, and…

• A. Mercury takes a long time to contract
• B. The amount of mercury use is very small
• C. The capillary tube has a small constriction near the bulb
• D. The capillary tube is very narrow

Explanation: A clinical thermometer has a narrow constriction near the bulb that prevents the mercury column from returning immediately when the…

• A. its pressure is constant
• B. its pressure rises
• C. its pressure falls
• D. any of above

Explanation: At constant volume, the ideal-gas relation P/T = constant applies, so pressure increases directly with absolute temperature.

• A. isochoric processes
• B. isobaric processes
• C. isothermal processes
• D. adiabatic processes

Explanation: Boyle's law states that for a fixed amount of gas at constant temperature, PV = constant, or P is inversely proportional to V.

• A. volume
• B. pressure
• C. absolute temperature
• D. time

Explanation: The average translational kinetic energy of a molecule is (3/2)kT, where k = 1.38 x 10^-23 J K^-1 and T is absolute temperature in kelvin.

• A. Boyles law
• B. Charles law
• C. Ideal gas law
• D. Avagadros law

Explanation: At constant pressure, the ideal-gas law gives V/T = constant, so density ρ = m/V is inversely proportional to absolute temperature T.

• A. 1 atmosphere
• B. 1 Newton per square meter
• C. 1 Pascal
• D. data is insufficient

Explanation: A mercury column of height 76 cm, equal to 760 mm, at 0°C produces the standard atmospheric pressure of 1 atm.

• A. Heat engine
• B. Human body
• C. Atmosphere
• D. Laboratory

Explanation: Metabolism is the set of chemical reactions in a living organism through which nutrients are converted into usable energy and other…

• A. Frictional process
• B. Chemical processes
• C. Electrical processes
• D. All of the above

Explanation: Heat can be generated by friction, released during chemical reactions, and produced when electrical energy is dissipated as resistance…

• A. Hyperbola
• B. Parabola
• C. A curve of any shape
• D. A straight lime

Explanation: Boyle's law gives PV = constant at constant temperature, so V = constant × 1/P.

• A. The temperatures of water at 0? 100?C
• B. The temperature of melting ice and boiling water at atmospheric pressure
• C. The temperatures of ice cold and boiling water
• D. The temperatures of frozen and boiling mercury

Explanation: Temperature scales use two reproducible reference temperatures: the melting point of ice and the boiling point of water, both measured at…

• A. How much heat a body contains
• B. Whether a body will feel hot or cold to touch
• C. In which direction heat will flow between two systems
• D. How much total absolute energy a body has

Explanation: Temperature determines the direction of heat transfer: heat flows spontaneously from the body at higher temperature to the body at lower…

• A. non-renewable
• B. stable
• C. renewable
• D. none of the above

Explanation: Geothermal energy uses heat from inside the Earth, which is continually replenished by natural geological processes, so it is classified…

• A. heat energy into electrical energy
• B. heat energy into light energy
• C. heat energy into mechanical energy
• D. mechanical energy into heat energy

Explanation: A thermocouple uses the Seebeck effect: a temperature difference between two junctions produces an EMF and hence electrical energy.