Which one of the following correctly describes the principle of the working of an atomic clock?
Vibration of a small quartz crystal
Simple harmonic motion of atoms inside a crystal
Resonant frequency in cesium (or rubidium) atom
Excitation and de-excitation of hydrogen atoms
For election to the Lok Sabha, a nomination paper can be filed by
Miscellaneous · Easy
In a month if the seventh day is three days earlier than Saturday,then the nineteenth day of the month will be a
Miscellaneous · Easy
Which among the following events happened earliest ?
Miscellaneous · Easy
An 80-litre solution of alcohol and water has 75% alcohol. How much water (in litres) must be added to bring down the concentration of alcohol to 60%?
Miscellaneous · Easy