Railways

Important Science Fact For Railway Exam

Helium has the lowest boiling point of any element.
Pure silicon is a semi-conductor and is used in electronic devices as the base for minute integrated circuits (ICs).
Mercury is the only metal which is liquid at room temperature.
Osmium is the densest element.
Tungsten has the highest boiling point of all the elements.
Caesium is used in atomic clocks.
The shape of rain drop is spherical due to surface tension.
Lactometer is used to determining purity of milk.
Clouds are flying due to their least density and viscosity of air.
Viscosity of gases increases with increase in temperature.
The force of attraction between atoms of the same material is called cohesive force.
The force of attraction between atoms of different material is called adhesive force
Tritium is radioactive isotopes of Hydrogen.
Tuning of radio is an example of resonance.
Cobalt-60 is used in Leukaemia treatment.
Cybernetics is study of communication between human and machine.
The filament of Halogen lamp is made of tungsten-iodine mixture.
Slip sings of generator are made of gun metal.
Brushes of generator are made out of carbon or gun metal.
Ammeter is used in DC as well as in AC.
Resistance of Ammeter is very low.
Resistance of Voltmeter is very high.
Voltmeter measures potential difference between two points.
A series combination of a galvanometer and a high resistance is equivalent to a voltmeter.
Ammeter is always connected in series while voltmeter is always connected in parallel.
Electron volt is the unit of energy.
Generator is based on the principle of electromagnetic induction.
The resistance of low power (watt) bulb is high.
Ceramic is used in Super-conductivity.