Electric current is measure by
Brass gets discoloured in air because of the presence of which of the following gases in air?
Which of the following is a non metal that remains liquid at room temperature?
Chlorophyll is a naturally occurring chelate compound in which central metal is
Which of the following is used in pencils?
Which of the following metals forms an amalgam with other metals?
'Bar' is the unit of
The wavelength of X-rays is of the order of
Which of the following has a least penetrating power?
One Joule is equal to
Which of the following rays are more penetrating?
In an atomic nucleus, neutrons and protons are held together by
Mesons are found in
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