PHYSICS QUIZ3

1.
Pa(Pascal) is the unit for



2.
Sound waves in air are



3.
Materials for rain-proof coats and tents owe their water-proof properties to



4.
RADAR is used for



5.
The velocity of sound in air (under normal conditions) is–



6.
 Power of sunglass is- 



7.
At room temperature, which element conducts electricity better than any other element?