The rate of evaporation of a liquid increases when:

1. temperature of liquid falls
2. liquid is poured in a vessel of less surface area
3. air is blown above the surface of liquid
4. humidity increases

During boiling or vaporization:

1. all molecules take part
2. temperature rises
3. no heat is absorbed
4. the average kinetic energy of molecules increases

Two rods A and B of the same metal, but of length 1 m and 2 m respectively, are heated from 0°C to 100°C. Then:

1. both the rods A and B elongate the same
2. the rod A elongates more than the rod B
3. the rod B elongates more than the rod A
4. the rod A elongates, but the rod B contracts

Two rods A and B of the same metal, same length, but one solid and other hollow, are heated to the same rise in temperature. Then:

1. the solid rod A expands more than the hollow rod B
2. the hollow rod B expands more than the solid rod A
3. the hollow rod B contracts, but the solid rod A expands
4. both the rods A and B expand the same