Thermal Properties of Matter Mock Test – Class 11 Physics

1. Two rods and have the same length and are heated through the same temperature rise. Their coefficients of linear expansion are and . The ratio is:

2. Wien’s constant is approximately . For a body at , the wavelength of maximum emission is closest to:

3. Read the case and answer the question.

How does the volume of water change during this heating?

4. For an isotropic solid, the coefficient of area expansion is approximately:

5. A heating experiment gives the same heat to two equal masses of substances and . Substance has , while substance has . The ratio of temperature rises is:

6. The SI unit of heat capacity is:

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

8. A ring made of metal is heated and then slipped onto a shaft. After cooling, it grips the shaft tightly. The sequence of size changes is:

9. Thermal expansion of a solid depends on material, original size, and temperature change. The factor that represents the nature of the material in linear expansion is:

10. A block is heated from to . Its specific heat capacity is . How much heat is supplied if no heat is lost and no phase change occurs?

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. For the same substance, two samples of masses and are heated through the same temperature rise. The ratio of heat required by the first sample to the second sample is:

13. A steel wire of length is cooled from to . If , what is the change in length?

14. A sample of solid carbon dioxide at its sublimation temperature changes directly into gas at the same temperature. The latent heat of sublimation is . The gas is then warmed by , and its specific heat capacity is . What is the total heat required?

15. A room heater warms the air near it. The air rises and cooler air moves in near the floor. The repeated motion forms:

16. 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:

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

18. A shiny silvered surface is used in a thermos flask mainly to reduce:

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

20. A small metal ball and a large metal ball are made of the same material. Both are to be heated through . The larger ball needs more heat mainly because:

21. A pendulum clock is correct at . On a hot day, its pendulum length increases by . The time period changes approximately by:

22. A graph is drawn with increase in area on the vertical axis and temperature rise on the horizontal axis for a fixed metal sheet. The graph is a straight line through the origin. Its slope represents:

23. A solid plate and a solid cube are made of the same isotropic material and are heated through the same small temperature rise. If the fractional linear expansion is , then the approximate fractional area expansion of the plate and fractional volume expansion of the cube are:

24. A graph is drawn between apparent volume expansion of a liquid and temperature rise for a fixed initial volume in the same vessel. If the graph is a straight line through the origin, its slope represents:

25. A hot metal is placed in water inside a calorimeter. If the calorimeter heat capacity is included, compared with ignoring the calorimeter, the final temperature of water will generally be:

26. Study the table and identify the row that correctly describes a heated solid with a cavity.

27. A body cools from to in , and later from to in . The surrounding temperature is . Using the average-temperature form of Newton’s law of cooling, is closest to:

28. A hot object at and an identical object at radiate in the same surroundings, ignoring absorption for the comparison. The ratio of their emitted powers is:

29. A metal block at is kept in contact with another block at . Before they reach the same temperature, the direction of natural heat flow is:

30. A bimetallic strip is made of metals and , with . On cooling the strip below its original temperature, the strip bends so that:

31. A thermometer scale is assumed to be linear. The liquid column length is at and at . What temperature corresponds to a length of ?

32. A black body of area is at . Taking , its emitted power is closest to:

33. A body of specific heat capacity is heated by . The heat supplied, if there is no phase change, is:

34. Study the table and select the row that matches the quantity with its usual unit.

35. Assertion: A rise of is the same temperature interval as a rise of .
Reason: The Celsius and Kelvin scales have equal-sized divisions, although their zero points are different.

36. Use the arrangement described below. A metal ball just passes through a metal ring at room temperature. The ball is heated strongly, while the ring is kept at room temperature. What is most likely to happen when the heated ball is tried again?

37. For a body radiating heat, the Stefan-Boltzmann law says that the total energy radiated per unit time is proportional to:

38. A composite slab has two layers in series, each of area . Layer has thickness and . Layer has thickness and . If the outer faces are at and , what is the steady heat current?

39. 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:

40. Consider the following statements about latent heat.
Statement I: During melting of a pure solid, heat can be absorbed at constant temperature.
Statement II: During condensation, latent heat is released.
Statement III: Specific latent heat has unit .

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

42. Sea breeze during the day is mainly explained by:

43. A heating curve for a pure substance has two horizontal portions. The first horizontal portion occurs at melting point and the second at boiling point. The second horizontal portion is generally longer for the same mass and same heating rate if:

44. A square metal plate is heated uniformly. What happens to a circular hole at the centre of the plate?

45. 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 .

46. Study the table for surface effects in thermal radiation.

Which matching is correct?

47. A heater supplies energy at a constant rate . A mass of a solid is melting at its melting point with latent heat of fusion . The time needed for complete melting is:

48. Two solid bodies of the same material are heated through the same temperature rise. Body has twice the original volume of body . The ratio of their volume increases is:

49. A metal sphere has density at . It is heated to . If , what is its approximate density at , assuming isotropic expansion?

50. A composite slab has two layers of equal thickness and equal area. Layer has thermal conductivity , and layer has thermal conductivity . If the total temperature difference across the composite slab is , what is the temperature drop across layer in steady state?