Thermodynamics

Q. What happens to the internal energy of an ideal gas when it is compressed adiabatically?
  • A. It increases
  • B. It decreases
  • C. It remains constant
  • D. It depends on the initial temperature
Q. What happens to the pressure of an ideal gas if its volume is halved while keeping the temperature constant?
  • A. Pressure remains the same
  • B. Pressure doubles
  • C. Pressure halves
  • D. Pressure quadruples
Q. What happens to the rate of heat transfer through a material if its thickness is increased?
  • A. Increases
  • B. Decreases
  • C. Remains the same
  • D. Depends on the material
Q. What happens to the temperature of a gas when it expands adiabatically?
  • A. It increases
  • B. It decreases
  • C. It remains constant
  • D. It depends on the gas
Q. What happens to the temperature of a substance during a phase change?
  • A. It increases
  • B. It decreases
  • C. It remains constant
  • D. It fluctuates
Q. What happens to the thermal energy of a substance when it undergoes a phase change?
  • A. It increases
  • B. It decreases
  • C. It remains constant
  • D. It becomes zero
Q. What is the change in internal energy (ΔU) for an ideal gas in an isochoric process?
  • A. ΔU = Q
  • B. ΔU = W
  • C. ΔU = 0
  • D. ΔU = Q - W
Q. What is the change in internal energy for an ideal gas during an isochoric process?
  • A. Zero
  • B. nRΔT
  • C. Q
  • D. W
Q. What is the change in internal energy for an ideal gas undergoing an isochoric process?
  • A. Zero
  • B. Equal to the heat added
  • C. Equal to the work done
  • D. Equal to the change in temperature
Q. What is the change in internal energy of an ideal gas during an isochoric process?
  • A. Increases
  • B. Decreases
  • C. Remains constant
  • D. Depends on the amount of gas
Q. What is the effect of increasing the surface area of an object on its rate of heat transfer?
  • A. Increases
  • B. Decreases
  • C. No effect
  • D. Depends on the material
Q. What is the effect of increasing the surface area of an object on its rate of heat transfer by radiation?
  • A. Decreases
  • B. Increases
  • C. Remains constant
  • D. Becomes zero
Q. What is the effect of increasing the temperature of a gas at constant volume?
  • A. Pressure decreases
  • B. Pressure increases
  • C. Volume increases
  • D. Density increases
Q. What is the efficiency of a Carnot engine operating between temperatures T1 and T2?
  • A. (T1 - T2) / T1
  • B. T2 / T1
  • C. (T1 - T2) / T2
  • D. 1 - (T2 / T1)
Q. What is the entropy change for a reversible isothermal expansion of an ideal gas?
  • A. nR ln(Vf/Vi)
  • B. 0
  • C. nR(Tf - Ti)
  • D. nC ln(Vf/Vi)
Q. What is the entropy change for a reversible isothermal process?
  • A. Zero
  • B. nR ln(Vf/Vi)
  • C. nR(Tf - Ti)
  • D. nR ln(Tf/Ti)
Q. What is the entropy change for a reversible process?
  • A. Always positive
  • B. Always negative
  • C. Can be zero
  • D. Depends on the path taken
Q. What is the final temperature when 200 g of water at 90°C is mixed with 300 g of water at 30°C?
  • A. 50°C
  • B. 60°C
  • C. 70°C
  • D. 80°C
Q. What is the first law of thermodynamics?
  • A. Energy cannot be created or destroyed
  • B. Entropy of an isolated system always increases
  • C. Heat cannot spontaneously flow from a colder body to a hotter body
  • D. The total energy of a system is constant
Q. What is the heat required to raise the temperature of 250 g of aluminum from 25°C to 75°C? (Specific heat of aluminum = 0.9 J/g°C)
  • A. 4500 J
  • B. 5000 J
  • C. 6000 J
  • D. 7000 J
Q. What is the latent heat of fusion for ice?
  • A. 334 J/g
  • B. 2260 J/g
  • C. 4190 J/g
  • D. 1000 J/g
Q. What is the latent heat of fusion?
  • A. Heat required to change a solid to a liquid
  • B. Heat required to change a liquid to a gas
  • C. Heat required to change a gas to a solid
  • D. Heat required to change a liquid to a solid
Q. What is the main mechanism of heat transfer in liquids and gases?
  • A. Conduction
  • B. Convection
  • C. Radiation
  • D. Insulation
Q. What is the main mechanism of heat transfer in liquids?
  • A. Conduction
  • B. Convection
  • C. Radiation
  • D. Insulation
Q. What is the mode of heat transfer that occurs through a fluid due to density differences?
  • A. Conduction
  • B. Convection
  • C. Radiation
  • D. Insulation
Q. What is the mode of heat transfer that occurs through a fluid without any movement of the fluid itself?
  • A. Conduction
  • B. Convection
  • C. Radiation
  • D. Diffusion
Q. What is the primary factor affecting the rate of heat transfer by conduction?
  • A. Surface area
  • B. Temperature difference
  • C. Material properties
  • D. All of the above
Q. What is the primary mechanism of heat transfer in a vacuum?
  • A. Conduction
  • B. Convection
  • C. Radiation
  • D. None of the above
Q. What is the primary mechanism of heat transfer in liquids and gases?
  • A. Conduction
  • B. Convection
  • C. Radiation
  • D. Insulation
Q. What is the primary mechanism of heat transfer in liquids?
  • A. Conduction
  • B. Convection
  • C. Radiation
  • D. All of the above
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