Which of the following elements is obtained from sea weeds ?
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The recent atomic weight scale is based on
The solar eclipse occurs when
Polythene is industrially prepared by the polymerisation of
Cell membrane is
Pollination by birds is called
Which of the following parts of the sun is easily visible only during a total solar eclipse?
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The fastest-running terrestrial animal is
The metal used in storage batteries
The speed of light with the rise in the temperature of the medium
Which of the following characters is not shown by hydrogen
Apparatus invented by Archimedes is :
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The property of a substance to absorb moisture from the air on exposure is called
The type of glass used in making prisms and lenses is
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In an atomic nucleus, neutrons and protons are held together by
The marine animal called dugong which is vulnerable to extinction is a/an
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Which of the following is commonly called a polyamide ?
Which of the following elements is a metal
The metal that is present in Photo Films is
The hardest substance available on earth is
The formula of Plaster of Paris is
Quartz crystals normally used in quartz clocks etc. is chemically
Which of the following items will be attracted to the north pole of a permanent magnet by a magnet force?
Permanent hardness of water, due to sulphates of the metal, can be destroyed by the use of
Epoxy resins is used as
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