RRB Group D - Heat and temperature concepts Online Test (MCQ Quiz)

1. Which of the following is the SI unit of temperature?

A) Celsius B) Fahrenheit C) Kelvin D) Rankine

2. Heat is a form of:

A) Mass B) Energy C) Force D) Pressure

3. What is the process by which heat is transferred through direct contact of particles?

A) Conduction B) Convection C) Radiation D) Evaporation

4. Which mode of heat transfer does not require a medium?

A) Conduction B) Convection C) Radiation D) Diffusion

5. Convection is the primary mode of heat transfer in:

A) Solids B) Liquids and Gases C) Vacuum D) Metals

6. The boiling point of water at standard atmospheric pressure is:

A) 0°C B) 100°C C) 212°C D) -100°C

7. The freezing point of water at standard atmospheric pressure is:

A) 0°C B) 100°C C) 32°F D) -100°C

8. Which temperature scale has absolute zero at 0?

A) Celsius B) Fahrenheit C) Kelvin D) Réaumur

9. What is the relationship between Celsius (°C) and Kelvin (K) temperature scales?

A) K = °C + 273.15 B) °C = K + 273.15 C) K = °C - 273.15 D) °C = K - 273.15

10. A substance that transfers heat quickly is called a:

A) Thermal insulator B) Thermal conductor C) Thermal resistor D) Thermal capacitor

11. Which of the following is the best thermal insulator?

A) Copper B) Aluminum C) Wood D) Silver

12. The amount of heat required to raise the temperature of 1 kg of a substance by 1°C is called its:

A) Specific heat capacity B) Latent heat C) Thermal conductivity D) Heat capacity

13. The SI unit of specific heat capacity is:

A) J/kg B) J/kg·K C) J/K D) W/kg·K

14. Which substance has a very high specific heat capacity, making it useful for cooling systems?

A) Iron B) Water C) Mercury D) Lead

15. The change of state from liquid to gas is called:

A) Melting B) Freezing C) Boiling D) Sublimation

16. The change of state from solid to liquid is called:

A) Freezing B) Melting C) Condensation D) Evaporation

17. Latent heat is the heat absorbed or released during a:

A) Temperature change B) Phase change C) Volume change D) Pressure change

18. The latent heat of fusion is associated with the transition between:

A) Liquid and gas B) Solid and liquid C) Solid and gas D) Gas and plasma

19. The latent heat of vaporization is associated with the transition between:

A) Solid and liquid B) Liquid and gas C) Solid and gas D) Liquid and solid

20. Which of the following phenomena is an example of heat transfer by radiation?

A) Steam heating a pipe B) Boiling water in a pot C) Feeling the warmth of the sun D) A radiator heating a room

21. A substance that resists the flow of heat is called a:

A) Thermal conductor B) Thermal insulator C) Thermal generator D) Thermal amplifier

22. In which state of matter does convection occur most readily?

A) Solid B) Liquid C) Gas D) Plasma

23. Which instrument is used to measure temperature?

A) Barometer B) Anemometer C) Thermometer D) Hygrometer

24. The device used to measure the amount of heat absorbed or released is called a:

A) Thermometer B) Calorimeter C) Pyrometer D) Manometer

25. The Celsius scale assigns 0°C to the freezing point of water and ___°C to its boiling point.

A) 50 B) 100 C) 180 D) 212

26. The Fahrenheit scale assigns 32°F to the freezing point of water and ___°F to its boiling point.

A) 100 B) 180 C) 212 D) 273

27. Absolute zero is the theoretical temperature at which molecular motion:

A) Is maximum B) Is minimum C) Ceases D) Doubles

28. Which of the following is a common application of conduction?

A) Sea breezes B) Heating of Earth by the Sun C) Cooking using a metal spoon D) Hot air balloons

29. Which of the following is a common application of convection?

A) A metal rod heating up when one end is heated B) Feeling the warmth of a campfire C) The circulation of air in a room due to a heater D) A black t-shirt feeling hotter in the sun than a white one

30. The process of evaporation causes cooling because:

A) Heat is released B) Heat is absorbed C) Temperature increases D) Pressure decreases

31. The SI unit of heat energy is the:

A) Watt B) Joule C) Calorie D) Newton

32. A thermos flask minimizes heat transfer by:

A) Conduction only B) Convection only C) Radiation only D) All three modes (conduction, convection, and radiation)

33. Black surfaces are good absorbers of heat radiation. This is why:

A) We wear white clothes in summer B) We wear black clothes in winter C) Ovens have black interiors D) Mirrors are shiny

34. What is the term for the transfer of heat through electromagnetic waves?

A) Conduction B) Convection C) Radiation D) Advection

35. The temperature at which a gas becomes a liquid is called:

A) Boiling point B) Melting point C) Condensation point D) Sublimation point

36. A substance with low specific heat capacity will:

A) Heat up slowly B) Heat up quickly C) Cool down slowly D) Not change temperature

37. Which of the following is NOT a method of heat transfer?

A) Conduction B) Convection C) Radiation D) Friction

38. If the temperature of an object is 300 K, what is its temperature in Celsius?

A) 27°C B) 30°C C) 303°C D) -27°C

39. When ice melts, it absorbs heat from the surroundings, causing the surroundings to:

A) Heat up B) Cool down C) Boil D) Freeze

40. The process of heat transfer from the sun to the Earth occurs mainly by:

A) Conduction B) Convection C) Radiation D) Conduction and Convection

41. The SI unit of thermal conductivity is:

A) W/m·K B) J/kg·K C) W/m²·K D) J/m·K

42. Which phenomenon explains why a metal spoon in hot soup becomes hot?

A) Convection B) Radiation C) Conduction D) Advection

43. The temperature of a human body is approximately:

A) 37°F B) 98.6°F C) 37 K D) 273 K

44. A substance that expands significantly when heated has a high:

A) Specific heat capacity B) Latent heat C) Coefficient of thermal expansion D) Thermal conductivity

45. Which of the following is an example of sublimation?

A) Water turning into ice B) Dry ice turning into carbon dioxide gas C) Steam turning into water D) Alcohol evaporating

46. The heat transfer from the Earth's core to the surface primarily occurs through:

A) Conduction and convection B) Radiation C) Convection only D) Conduction only

47. Which of these is a measure of the average kinetic energy of the particles in a substance?

A) Heat B) Temperature C) Specific Heat Capacity D) Latent Heat

48. When water boils, its temperature:

A) Increases B) Decreases C) Remains constant D) Becomes zero

49. The shiny surface of a vacuum flask is designed to:

A) Increase heat absorption B) Decrease heat absorption C) Reduce heat transfer by radiation D) Reduce heat transfer by convection

50. Which process involves the transfer of heat by the movement of a fluid?

A) Conduction B) Convection C) Radiation D) Diffusion

Heat and temperature concepts - Online Test

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