Tritium
Deuterium
Protium
Yttrium
the main constituents of pearls are
Amalgams are
lightest metal is the
Which of the metals remain in liquid for under normal conditions
Potassium Permanganate is used for purifying drinking water
Which of the following is an element
What is the unit for measuring the amplitude of a sound ?
Reading of a barometer going down is an indication of
Decibel is the unit for
One fathom is equal to
