Which of the following plays an important part while drinking a liquid with a straw?
Humidity
Temperature
Atmospheric pressure
Composition of air
Which of the following plays a very important role in the oxygen cycle ?
Birds
Animals
Plants
Soil
Smoke is an example of:
Liquid-in-gas mixture
Gas-in-solid mixture
Solid-in-gas mixture
Gas-in-liquid mixture
The humidity of a place:
Lies between 10% to 20%
Is always more than 50%
Is always less than 80%
Varies from time to time
Which of the following is combustible ?
Oxygen
Carbon dioxide
Hydrogen
All
Mountaineers carry oxygen cylinders with them because:
Oxygen supports combustion
Air becomes thinner as we go higher
Air is dense but lacks oxygen in mountains
None of these
Which of the following can show the direction of wind?
Anemometer
Wind vane
Wind mill
Barometer
Which of the following statement is true regarding earth's atmosphere?
It gets denser with increase in altitude
It gets thinner with increase in altitude
Its thickness is atleast one fourth the radius of the earth
It contains no solid particles
We can find tiny droplets of water on the outer surface of a steel glass containing cold water or ice. This shows that:
Steel contains air
Air contains water vapour
Cold water can seep through solids
Which of the following gases cause the harmful green house effect?
Nitrogen
