31. . . . . . . . . is a superficial phenomenon
32. The variations in temperature from 0°C to 100°C with respect to time of two liquids P, Q are shown in the graph given below.
Which of the following statement is correct?
Which of the following statement is correct?
33. The water kept in an earthen pot remains cool even in summer-
34. -273.15°C temperature is equal to:
35. Heat, in . . . . . . . . is a type of energy transfer from a warmer substance to a colder one.
36. What is the physical state of water at 257° Celsius?
37. Match the following.
Process
Changes
a. Evaporation
1. Liquid into gas
b. Sublimation
2. Solid into gas
c. Freezing
3. Solid into liquid
d. Melting
4. Liquid into solid
| Process | Changes |
| a. Evaporation | 1. Liquid into gas |
| b. Sublimation | 2. Solid into gas |
| c. Freezing | 3. Solid into liquid |
| d. Melting | 4. Liquid into solid |
38. An assertion and its reason is given below.
Assertion (A): Salt is used for cooking the food at places on higher from sea level.
Reason (R): Temperature is low in higher places.
Which one among these is right answer?
Assertion (A): Salt is used for cooking the food at places on higher from sea level.
Reason (R): Temperature is low in higher places.
Which one among these is right answer?
39. What does an air conditioner installed in a room control?
40. Which of the following is not a conductor of electricity?
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