Our body temperature is maintained at:
20oC
41oC
37oC
11oC
When water is cooled it contracts until it reaches ______ and then it starts expanding.
40oC
0oC
4oC
Water is an extremely stable:
atom
element
mixture
compound
Specific heat of water is:
very high
very low
medium
sometimes high and sometimes low
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
Which of the following is a balanced equation?
H2 + 2O2 → 2H2O
2H2 + O2 → H2O
H2 + O2 → H2O
2H2 + O2 → 2H2O
Impurities in water:
Lower the freezing point
increase the boiling point
none of these
both of these
The percentage of water in human body is:
80%
70%
60%
50%
Which of the following is mostly used as a drinking water source by us?
Sea water
Glaciers
Ground water
Brackish water
The process of breaking down of a compound of passing electric current through it is called:
hydrolysis
photosynthesis
electrolysis
distillation