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.
Get the File To Read Later From Here
