Two atoms are said to be isotopes if
they have the same atomic number but different mass numbers
they have the same number of neutrons but different mass numbers
the sum of the number of protons and neutrons is the same, but the number of protons is different
they have the same number of neutrons but different modes of radioactive decay
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