Science

When we see movie how many pictures are falling on the screen in a second?
24-39 pictures

Which instrument is used for measuring variations in the gravitational field in different parts of the earth?
Gravimeter

Which instrument is used for measuring the humidity of air?
Hydrometer

Who made the first ever parachute jump?
Jaqres Garnerin, in 1797

What is the law contained in the working of rockets?
Newton’s Third Law of Motion

What is the scientific name of “Photostat”?
Xerography

Who invented Xerography?
C.F.Carrison

Is melting if ice, a chemical change or physical can not be changed into liquid form?
Ideal gases

Pascal is the unit of what?
Pressure

Who started the publication of “Indian Journel of Physics?
C.V Raman