Advertisements
Advertisements
प्रश्न
_______ can be seen moving in a beam of sunlight in a dark room.
Advertisements
उत्तर
Dust particles can be seen moving in a beam of sunlight in a dark room.
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.
What are the causes of air pollution?
Name three noble gases present in the air. State their one industrial use
Complete and balance the following equation
CaO + H2O →
Give reason:
Mountaineers and divers carry oxygen cylinders with them.
Write ‘true’ or ‘false for the following;
Carbon dioxide is given out during photosynthesis
State whether the following statement is ‘true’ or ‘false’. If false write the correct statement.
Photosynthesis is a process by which green plants prepare their own food in the presence of sunlight and chlorophyll.
State four different properties of a compound and a mixture.
Match the following
| 1. | Moving Air | Photosynthesis |
| 2. | Layer in which we live | Troposphere |
| 3. | Stratosphere | Wind |
| 4. | Oxygen | Ozone layer |
| 5. | carbon-di-oxide | Combustion |
Explain the following observations very briefly
Breathing through mouth may harm you.
