Which one of the following elements will be an isobar of calcium if the atomic number of calcium is 20 and its mass number is 40?
Element with 20 protons and 18 neutrons
Element with 18 protons and 19 neutrons
Element with 20 protons and 19 neutrons
Element with 18 protons and 22 neutrons
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