Thermal Properties of Matter Mock Test – Class 11 Physics

1. Under Newton’s law of cooling, a body in surroundings at has temperature initially. After some time, its excess temperature becomes half of its initial excess. What is its temperature then?

2. A heating curve for a pure substance shows a horizontal segment at its melting point. What does this horizontal segment represent?

3. A metal ring is heated uniformly. Ignoring any change of state, what happens to the outer diameter of the ring and the diameter of its hole?

4. A sample of water at is placed in a low-pressure chamber where water boils at . Some water evaporates, and the remaining water cools to . If no heat enters from outside, and , what approximate mass of water evaporates?

5. Read the case and answer the question.

How does the volume of water change during this heating?

6. A sample of ice at is first melted and then the resulting water is heated to . Take and . What total heat is required?

7. A mixture problem gives a final temperature higher than the initial temperature of the hot body. Without external heating or a chemical reaction, this result should be rejected because:

8. A cube made of an isotropic material has side . After a small temperature rise, each side becomes approximately . The first-order reason for is that:

9. A copper calorimeter of mass contains of water at . A metal block at is dropped into it, and the final temperature is . If and , what is the specific heat capacity of the metal block?

10. A pan has a metal base and a plastic handle. The plastic handle is used mainly because plastic:

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

12. A graph of heat supplied against temperature rise is drawn for of a substance. The graph is a straight line through the origin with slope . What is the specific heat capacity of the substance?

13. A metal block absorbs of heat, and its temperature rises by . What is its specific heat capacity?

14. Mercury was commonly used in glass thermometers because its volume changes visibly with temperature. In this thermometer, the main thermometric property is:

15. A hot liquid of heat capacity at is mixed with a cold liquid of heat capacity at in an insulated vessel. If no heat is lost to the vessel, what is the final temperature?

16. Study the table and identify the row in which the conversion idea is used properly.

17. Temperature may commonly be expressed in:

18. 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:

19. A rod of Young’s modulus and coefficient of linear expansion is heated by while its expansion is completely prevented. Within the elastic limit, the thermal stress is:

20. A dull black surface and a shiny polished surface are kept at the same high temperature. The dull black surface generally:

21. A Celsius thermometer and a Kelvin thermometer are used to describe the same thermal state. The relation between the Kelvin temperature and the Celsius temperature is:

22. 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 ?

23. A cooking pot is heated from below. Water near the bottom becomes warmer and rises, while cooler water moves downward. This circulation is mainly:

24. A rod is fixed between two rigid walls. If it were free, a temperature rise would produce fractional expansion . When the expansion is fully prevented, the strain that is effectively constrained is:

25. A solid block has volume at a certain temperature. It is heated through , and . What is its final volume?

26. A shallow dish contains of water at . Due to evaporation, of water leaves the surface. Assume the latent heat needed for evaporation is taken only from the remaining water, , and . What is the approximate final temperature of the remaining water?

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

28. A slab conducts heat at a steady rate of . How much heat passes through the slab in ?

29. A thin metal plate of area is heated through . If , what is the increase in area?

30. Two samples of the same liquid are mixed in an insulated vessel. One has mass at temperature , and the other has mass at temperature . If no heat is lost and both samples have the same specific heat capacity, the final temperature is:

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

32. In a liquid-in-vessel experiment, the real expansion of the liquid is larger than the apparent expansion because:

33. 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?

34. A concrete bridge has expansion joints at intervals. These joints are provided mainly to:

35. Study the table and identify the correct comparison.

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

37. Assertion: A blackened vessel cools faster than a polished vessel of the same size at the same temperature, under similar surroundings.
Reason: A dull black surface is a better emitter of thermal radiation than a polished surface.

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

39. A glass flask of volume is completely filled with mercury at . The system is heated to . If and , what volume of mercury overflows?

40. A thermos flask reduces heat transfer by using several design features. Which matching is most suitable?

41. Two rods are connected in parallel between the same hot and cold reservoirs. Rod and rod have the same length and area, but . The ratio of heat currents is:

42. A calorimeter of heat capacity contains of water at . A hot metal piece loses of heat to the water and calorimeter. Taking , what is the final temperature?

43. Study the table and identify the row that correctly connects the process with the heat relation.

44. In a heated bimetallic strip, metal has a larger coefficient of linear expansion than metal . After heating, the strip bends so that:

45. Two slabs of the same material and same area are maintained between the same two temperatures. Slab has thickness , while slab has thickness . The ratio of heat currents is:

46. A heating problem compares two formula uses: and . The safest decision rule is:

47. A sealed container of gas and a metal rod are both at . What does this equality of temperature most directly tell us?

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

49. A liquid thermometer is made with a very wide capillary tube instead of a narrow one. For the same volume expansion of liquid, what happens to the movement of the liquid column?

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