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| Heat Mcqs 21 to 40 |
21. What is the SI unit of heat?
A. Calorie
B. Joule
C. Watt
D. Kelvin
22. Heat transfer from a hot object to a cold one occurs until:
A. The hot object disappears
B. The cold object heats up completely
C. Both reach thermal equilibrium
D. The hot object cools below the cold one
23. Which of the following is a good conductor of heat?
A. Copper
B. Wood
C. Plastic
D. Glass
24. The method of heat transfer in liquids is mainly:
A. Conduction
B. Convection
C. Radiation
D. Reflection
25. Which surface is best for absorbing radiant heat?
A. White and shiny
B. Silver and smooth
C. Black and dull
D. Transparent glass
26. Which of the following materials is a poor conductor of heat?
A. Copper
B. Aluminum
C. Wood
D. Iron
27. Which method of heat transfer does not require a medium?
A. Conduction
B. Convection
C. Radiation
D. Conduction and convection
28. Which of the following expands most on heating?
A. Solid
B. Gas
C. Liquid
D. Glass
29. Which metal is used in a thermometer because it expands uniformly?
A. Copper
B. Silver
C. Mercury
D. Iron
30. What happens to the temperature of a substance during its phase change?
A. Increases rapidly
B. Decreases steadily
C. Remains constant
D. Doubles
31. What is the SI unit of heat?
A. Calorie
B. Joule
C. Watt
D. Kelvin
32. What is the process by which heat is transferred in solids?
A. Conduction
B. Convection
C. Radiation
D. Evaporation
33. Which of the following is not a method of heat transfer?
A. Conduction
B. Convection
C. Radiation
D. Diffusion
34. Which material would be best to use as a heat insulator?
A. Copper
B. Iron
C. Wool
D. Aluminum
35. What happens when a substance is heated?
A. Particles slow down
B. Particles move faster
C. Particles disappear
D. Particles stop moving
36. Which type of heat transfer is responsible for the warmth felt from sunlight?
A. Conduction
B. Convection
C. Radiation
D. Reflection
37. Which device measures temperature?
A. Thermometer
B. Barometer
C. Hygrometer
D. Ammeter
38. Which of these is a good conductor of heat?
A. Wood
B. Plastic
C. Glass
D. Silver
39. Boiling of water is an example of:
A. Conduction
B. Convection
C. Radiation
D. Insulation
40. Which of these processes results in cooling?
A. Melting
B. Condensation
C. Evaporation
D. Freezing
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