1) Who was the first person to design models of flying machine? 2) Who tried to prove that air is weightless? 3) Aqua-Lung is used by who? 4) Who invented Archimedean screw? 5) A device that converts motive power or fuel-based power into electric power for use in an external circuit. 6) How many meters in a kilometer? 7) Who invented the microwave? 8) Magnetic flux density is measured in _ 9) Which unit is used to measure the frequency of sound? 10) Any material capable of attracting iron and producing a magnetic field outside itself. 11) Branch of physics that deals with the determination of behaviour and the properties of light. 12) How many cm in a meter 13) How many grams in a kilogram? 14) Who is the father of modern physics? 15) What does nanometer measure? 16) what does the word "RADAR" stands for? 17) What is the hardest known substance 18) It describes how long the wave is. 19) How many secs in an hour? 20) How many hours in a day?

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