Which one of the following statements is not correct?
Elements are defined by the number of protons they possess.
Isobars are atoms having the same atomic number but different mass number.
The mass number of an atom is equal to the number of nucleons in its nucleus.
Valency is the combining capacity of an atom.
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