31. Supercooling is cooling of liquid ________
32. Liquids and gases never show
33. A circular plate, a cube and a sphere, all made up of same material and having the same
mass, are heated to 300°C and left in a room. Which of them will have the slowest rate of cooling?
mass, are heated to 300°C and left in a room. Which of them will have the slowest rate of cooling?
34. The humidity of the air depends upon
35. In a freezer ice cubes will be formed more quickly in trays made of
36. The ''four stroke petrol engine' is based on
37. The spring balance works on the principle of ________ .
38. A metal plate with a circular hole at the centre is heated. What will happen to the area of the hole ?
39. Air is said to be saturated when
40. At constant pressure, the volume of a fixed mass of a gas is directly proportional to its absolute temperature. It is the statement of
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