The surface of the earth has _____ of its total area as land
Two thirds
One thirds
Two fifths
One tenths
The density of water is
0.1 g/cm3
1 g/cm3
100 g/cm3
1 kg/m3
The density of water is not same at all temperatures because of its anomalous expansion. The density is maximum at
00 C
40 C
400 C
1000 C
Saline water is useful for
Washing clothes
Drinking
For agriculture
None
The main source of water for perennial rivers is in the form of
Lakes
Rain water
Snow
Dams
Which of the following will be an advantage of inter linking the rivers in India ?
Lot of people will be displaced
Floods will take place uniformly throughout the country
Surplus water will be distributed uniformly
The cost of implementation will be very high
Water is called the universal solvent because
It dissolves in most of the liquids
It can dissolve most of the substances
It contains many salts and minerals
It can exist in three states
Which of the following is potable water
A glass of water fit for drinking
Water in a pot
Sea water
Water with bacteria and chemicals
Which of the following statement is true ?
The salinity of rivers increase with time
The salinity of rivers decrease with time
The salinity of seas increase with time
The salinity of seas decrease with time
Which of the following processes cannot take place in the absence of oxygen ?
Combustion
Respiration
Oxidation
All of these
