In an atomic nucleus, neutrons and protons are held together by
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One fathom is equal to
The removal of top soil by water or wind is called
The major ingredient of leather is
The recent atomic weight scale is based on
Which of the following parts of the sun is easily visible only during a total solar eclipse?
The metallic constituents of hard water are
The chemial name of Uria is
What is the unit for measuring the pitch or frequency of sound ?
Permanent hardness of water, due to sulphates of the metal, can be destroyed by the use of
Water has maximum density at
Polythene is industrially prepared by the polymerisation of
The Panda belongs to the same family as that of
The marine animal called dugong which is vulnerable to extinction is a/an
Lightening cause rainfall because
Which of the following elements is non-radioactive?
According to Daltons atomic theory the smallest particle which can exist independently is
The intencity of Earthquakes is measured on
Which of the following is commonly called a polyamide ?
The location and energy of an electron in an atom can be specified by
The most important ore of Aluminium is
The oxide of Nitrogen used in medicine as anaesthetic is
Cell membrane is
Which of the following is in liquid form at room temperature ?
Brass gets discoloured in air due to the presence of which gas in air
The element present in the largest amount in rocks and minerals is
The formula of Plaster of Paris is
The fastest-running terrestrial animal is
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