Science

Which device is used to escape at the time of a plane accident?
Parachute

What is the length of “ nautical mile?
About 2025 yards, 1852 metres

Which is the device that changes light energy into electric energy?
Photo electric cell

What is absolute zero (The temperature at which the atom of a matter becomes still)?
-273degree centigrade or 0 degree K

Which thermometer is used to fine continuous changes in temperature?
Thermo electric thermometer

What is the most important advantages of sodium vapour lamp?
It requires less electricity

When heated, a material attaining gaseous state directly from solid state. Which is the freezing point of a liquid?
Cryoscope

Why does a straight stick seem to be curved in water?
Because of diffraction

It is the characteristic of liquid drops to be in spherical shapes. What is its reason?
Surface tension

Which is the glass that darkness in sunlight and lightens in darkness?
Photo chronic glass