Advertisements
Advertisements
प्रश्न
Why do traffic assistants wear a mask on duty?
Advertisements
उत्तर
Traffic assistants are continually exposed to smoke emitted out from the vehicles. Inhaling the pollutants in the smoke may cause breathing and lung problems. So they wear a mask on duty.
APPEARS IN
संबंधित प्रश्न
Answer the question put against the following constituents of air :
Oxygen : What is the percentage proportion of oxygen in air ? Why is oxygen called active air.
“Air is a mixture”. Support this statement citing at least three evidences.
State three uses of water vapour in the air.
Write ‘True’ or ‘False’ in front of following statement.
The area where a lot of fuel burns has more percentage of carbon dioxide.
Name three noble gases present in the air. State their one industrial use
What do you observe when Ice cold water is filled in a glass tumbler.
Give a reason why two different rare (inert) gases find application in advertisement signs and fluorescent bulbs.
The main component of air is oxygen.
Write just a few sentences for an imaginary situation if any of the following gases disappear from the atmosphere.
Nitrogen
On a Sunday morning Paheli’s friend visited her home. She wanted to see some flowering plants in the nearby garden. Both of them went to the garden. While returning from the garden they also observed some flowering plants on the road side. But to their surprise they found that the leaves and flowers of these roadside plants were comparatively very dull. Can you help them to know why?
