The density of water is:
0.5 g/cm3
0.1 g/cm3
10 g/cm3
1 g/cm3
Ice floats on water because
ice is heavier than water
ice is cooler than water
ice is lighter than water
ice is a solid
Our body temperature is maintained at:
20oC
41oC
37oC
11oC
Sea water does not freeze as easily as water from the lake because it contains:
plants
fishes
salts
frogs
Impurities in water:
Lower the freezing point
increase the boiling point
none of these
both of these
Iron reacts with:
water
steam
cold water
hot water
The percentage of water in human body is:
80%
70%
60%
50%
When water is cooled it contracts until it reaches ______ and then it starts expanding.
40oC
0oC
4oC
The melting point of ice is:
32oC
100oC
Which of the following does not cause a depletion in the water table of a place?
Constructing factories and houses
Making concrete roads and floors
Deforestation
All of these
