What is the rectilinear propagation of light?
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What are the weights in pounds of liquid gallons?
Describe the Thermos Flask?
If a plane is in the air and there is a fly flying inside the plane does the plane get heavier when the fly lands?
Explain what is the shadows?
What is the difference between Centigrade thermometer and a Reaumer thermometer ?
Why in cold countries, the water at the surface freezes and in the inner portion it is in the sate of water ?
Explain the Sound ?
What is soft water?
list and describe the three types of transformer?
What are the essential characteristics of a wave?
What do you know about Absolute Zero?
When a toy balloon is filled with air and then the air is allowed to go out, why dies the balloon whiz away ?