Thermal Properties of Matter Mock Test – Class 11 Physics

1. An arrangement uses two rods of equal original length joined end to end. Rod has coefficient , and rod has coefficient . Both experience the same temperature rise . If rod expands by , the total increase in length of the joined arrangement is:

2. The coefficient of volume expansion has the same unit as and because:

3. In the conduction relation , the sign of indicates:

4. A colder steel cup and warmer water are brought into contact. Before they reach the same thermal condition, the natural heat transfer is expected to be:

5. The heat capacity of a body is given by:

6. Ice floats on water mainly because:

7. In an open vessel at normal pressure, of water starts boiling at . In a pressure cooker, the same mass of water starts boiling at . If the water is initially at and , how much extra heat is needed to bring the water just to its boiling point in the pressure cooker instead of the open vessel?

8. In a formula where the symbol specifically means absolute temperature, the value should be entered as:

9. A black body of area emits of radiation. Taking , what is its approximate temperature?

10. A metal cube has density at . It is heated through , and . What is its approximate new density?

11. The SI unit of specific heat capacity is:

12. A copper rod conducts heat into of ice at . The rod maintains a steady heat current of . If , how much ice melts in ?

13. 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:

14. Consider the following statements about thermometers.
Statement I: A thermometer must come into thermal equilibrium with the body whose temperature is measured.
Statement II: A thermometer reading is based on a physical property that changes with temperature.
Statement III: A thermometer can measure temperature without any calibrated scale or reference relation.

15. A lake is cooling from toward freezing conditions. Which layer is expected to sink most strongly during the cooling process?

16. A steel railway track is made with small gaps between successive rails. The main reason is to allow:

17. 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:

18. When a solid expands on heating, its density usually decreases because:

19. Assertion: A long steel rail may bend in hot weather if no expansion gap is provided.
Reason: When expansion is prevented, thermal stress can develop in the rail.

20. 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:

21. A temperature reading is . Its Celsius value is closest to:

22. A liquid appears not to rise in a vessel when both are heated together. The best interpretation is:

23. A student makes the following notes after studying thermal properties:

Which notes are correct?

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

25. A sample of water at is mixed with steam at in an insulated vessel. The steam condenses completely, and the final temperature is below . Take and . What is the heat released by steam only during condensation?

26. In thermal expansion, a solid rod generally becomes longer when heated because:

27. A liquid has coefficient of real expansion . It is heated in a glass vessel whose coefficient of volume expansion is . What is the coefficient of apparent expansion of the liquid?

28. A body has mass and specific heat capacity . Its heat capacity is:

29. 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?

30. A metal scale is correct at . At , each marked centimetre on the scale becomes slightly longer. If an object is measured with this hot scale, the reading will be:

31. A surface has emissivity . Compared with a perfect black body of the same area and temperature, it emits:

32. A metal cube of volume is heated through . If , what is the increase in volume?

33. 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:

34. Two equal masses of water and copper receive the same amount of heat, and neither changes state. Water has a much larger specific heat capacity than copper. The temperature rise of water will be:

35. For a solid rod heated through a small temperature range, the increase in length is represented by:

36. Assertion: In a well-insulated calorimeter, the final temperature of a hot body and cold water becomes the same after sufficient time.
Reason: Thermal equilibrium is reached when there is no net heat flow between bodies in thermal contact.

37. Specific heat capacity of a substance is the heat required to raise the temperature of:

38. A vacuum jacket in a thermos flask reduces heat transfer mainly by:

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

40. For steady heat conduction through a plane slab, the rate of heat flow is given by:

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. 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:

43. A block of ice at is heated to water at . Take , , and . What total heat is required?

44. A balloon filled with air is placed in warm water. If the balloon material can stretch and the pressure remains nearly atmospheric, the balloon becomes larger mainly because:

45. 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:

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

47. Temperature is best understood as a quantity that indicates the thermal state of a body. In ordinary terms, what does it help us decide?

48. A graph of volume against absolute temperature for a fixed mass of gas at constant pressure is a straight line through the origin. What does this graph show?

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

50. Heat capacity and specific heat capacity are related for a body of mass by: