PHYSICS ONE LINER SET 21

PHYSICS ONE LINER SET 21

1. Why is phenomenon of mirage? Due to total internal reflection
 

2. Which is the gas used to extinguish fire? Carbon dioxide
 

3. Which waves are used for a communication through artificial satellites? Microwaves
 

4. What is the temperature at which the speed of sound in air becomes double its value of 0°C?
819°C
 

5. What is the vertical component of earth’s magnetic field? 0°
 

6. The western disturbances which cause rain in north west India originate which sea?
Mediterranean Sea
 

7. Territorial waters of India extends upto how many nautical miles? 12
 

8. What is the ultimate cause of water movement in a plant stem against gravity? Osmosis
 

9. How can the quantity of water vapour the atmosphere hold increases? With increase of temperature
 

10. The focal length of the lens in a photographic camera is 5 cm. What is the power of the lens?
+ 20 D