Thermal Properties of Matter Mock Test – Class 11 Physics

1. Consider the following statements about real and apparent expansion of a liquid.
Statement I: Real expansion is the actual volume expansion of the liquid.
Statement II: Apparent expansion is the expansion observed relative to the expanding vessel.
Statement III: Apparent expansion is always greater than real expansion when the vessel expands.

2. A heater is used to warm of water from to . If only of the heater energy reaches the water, how long does the heating take? Take .

3. A simple heating record says that of heat is supplied to a small metal block. The value describes:

4. A black body at temperature has peak wavelength and emitted power . If its absolute temperature is doubled, what happens to and , assuming area is unchanged?

5. Two objects are at the same temperature, but one has much larger mass. What can be concluded from this information alone?

6. A white or shiny outer surface is often preferred for containers meant to reduce heating by sunlight because such a surface:

7. Consider the following statements about holes, cavities, and bimetallic strips.
Statement I: A hole in a uniformly heated plate expands.
Statement II: A cavity in a uniformly heated solid expands like the solid material around it.
Statement III: A bimetallic strip bends on heating because the two metals have unequal expansion.

8. A body absorbs of heat and its temperature rises by . What is its heat capacity?

9. The net radiation from a body becomes zero when:

10. A graph is plotted between heat-current through a fixed slab and temperature difference across it. If , , and remain constant, the graph is:

11. A block of ice at is placed in warm water. Some ice remains unmelted at the final state. What is the final temperature of the mixture?

12. The SI unit of heat capacity is:

13. Two identical cups contain equal amounts of hot tea at the same temperature. Cup has a dull black outer surface, while cup has a shiny polished outer surface. Under similar conditions, cup cools faster mainly because:

14. A fixed mass of gas has volume at . At constant pressure, its volume becomes . What is the final temperature?

15. A conduction experiment uses the same slab but reverses the two face temperatures. Initially, face is at and face is at . Later, face is at and face is at . What changes?

16. A cup of tea cools from to in a room at . Later, it cools from to . Which interval should take longer according to Newton’s law of cooling?

17. A body is in thermal equilibrium with body . Body is not in thermal equilibrium with body . What conclusion is most reasonable?

18. Wien’s displacement law connects the wavelength at which a blackbody emits maximum energy with its absolute temperature . The correct relation is:

19. Study the table and identify the row that gives a suitable use of thermal expansion.

20. A substance has . What heat is needed to raise the temperature of of this substance by , with no phase change?

21. Consider the following statements about water near .
Statement I: Water has maximum density at .
Statement II: Water contracts when heated from to .
Statement III: Water expands when heated above .

22. Assertion: Heating a substance may increase its internal energy.
Reason: Heat supplied to a body can change random molecular motion or molecular arrangement depending on the process.

23. A blackened surface is preferred on the bottom of some heating vessels because it:

24. A solid has heat capacity . Its specific heat capacity is:

25. A metal ball just passes through a metal ring at room temperature. Later, both the ball and the ring are heated uniformly by the same temperature rise, and both are made of the same material. The ball will most nearly:

26. A fixed mass of gas at constant pressure doubles its absolute temperature. Its volume becomes:

27. Consider the following statements about temperature scales.
Statement I: corresponds to about .
Statement II: A temperature interval of equals a temperature interval of .
Statement III: A body at has an absolute temperature of .

28. Two rods have the same length and area and are kept between the same temperature difference. Rod has thermal conductivity , while rod has thermal conductivity . The heat current in rod is:

29. A metal block at is dropped into water at . Some water changes into steam at , and the final state contains water and steam at . If , , and , what mass of water vaporises?

30. Latent heat is called “latent” because during a change of state:

31. A radiation spectrum shifts so that the wavelength of maximum emission changes from to . According to Wien’s law, the absolute temperature:

32. A body of initial density is heated and expands normally. If its volume increases by and its mass remains unchanged, the approximate percentage change in density is:

33. Water vapour at deposits directly into ice at . For water, take at and . How much heat is released when of vapour deposits into ice at ?

34. Linear expansion formulas are usually written for small temperature changes. The main reason is that:

35. Overhead electric wires are usually left slightly sagging between poles instead of being stretched very tight. The main thermal reason is:

36. A graph is plotted with heat supplied on the vertical axis and temperature rise on the horizontal axis for a body. If the graph is a straight line through the origin, its slope represents:

37. Two conducting slabs and are joined in series and have the same area. Their thermal resistances are and . The equivalent thermal resistance is:

38. Consider three bodies , , and . Body is in thermal equilibrium with , and is in thermal equilibrium with . What conclusion follows from the zeroth law of thermodynamics?

39. A sample of steam at is passed into water at in an insulated vessel. Take and . Assuming all steam condenses, what is the final temperature?

40. A sample of water at is cooled to and then frozen completely at . Take and . What total heat is removed?

41. A claim says, “If two bodies are at the same temperature, they must have received the same amount of heat to reach that state.” The most suitable evaluation is:

42. A real body of surface area , emissivity , and absolute temperature radiates power:

43. A thermometer has a fixed-point column length at and at . A body gives a steady column length of . If the scale is linear, what is the body’s temperature?

44. A laboratory graph is drawn with Kelvin temperature on the vertical axis and Celsius temperature on the horizontal axis. The graph is a straight line described by . What are the slope and vertical-axis intercept of this graph?

45. A polished metal kettle and a blackened metal kettle contain equal amounts of hot water at the same temperature. If heat loss by radiation is the main comparison, the blackened kettle cools faster because:

46. Two identical black bodies have absolute temperatures and . If the wavelength of maximum emission of body is three times that of body , then is:

47. Read the case and answer the question.

Which conclusion is most suitable?

48. The unit of the Stefan-Boltzmann constant can be found from . Its SI unit is:

49. A metal block expands from volume to a larger volume on heating, while its mass remains . Its new density is:

50. A sample of water is cooled from to . What happens to its density?