Question : Air is said to be saturated when -
Option 1: It contains the maximum content of water vapour.
Option 2: Its pressure is minimum.
Option 3: Its thickness is maximum.
Option 4: It blows over the barren land.
Correct Answer: It contains the maximum content of water vapour.
Solution : The correct option is It contains the maximum content of water vapour.
Nitrogen makes up 78% of the gas in the air, oxygen 21%, followed by argon and carbon dioxide in trace amounts. Water vapour is present in the air in varying amounts, along with dust particles. At a specific pressure and temperature, the air is considered to be saturated when it contains the maximum amount of water vapour. It is found that the relative humidity is 100% in such a condition.
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Question : For a ray of light to suffer total internal reflection it has to pass from:
Option 1: glass to water
Option 2: water to glass
Option 3: air to water
Option 4: air to glass
Question : When the grains of sand are very fine and light, the wind can carry it over very long distances. When such sand is deposited in large areas, it is called ______.
Option 1: stacks
Option 2: loess
Option 3: moraines
Option 4: mushroom
Question : The gas dissolved in water that makes it basic is:
Option 1: Ammonia
Option 2: Sulphur Dioxide
Option 3: Hydrogen
Option 4: Carbon Dioxide
Question : The surface tension of water on adding detergent to it:
Option 1: increases
Option 2: decreases
Option 3: no change
Option 4: becomes zero
Question : A cuboidal water tank is 12 m long, 9 m wide and 7.5 m deep. How many litres of water can it hold?
Option 1: 840000
Option 2: 805000
Option 3: 780000
Option 4: 810000
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