Which one of the following statements is not correct?
Atoms of different elements may have same mass numbers
Atoms of an element may have different mass numbers
All the atoms of an element have same number of protons
All the atoms of an element will always have same number of 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