Carbon tetrachloride fire extinguisher should not be used in closed room because it produces poisonous glass called
None of these
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Water has maximum density at
The chemial name of Uria is
The metal that is present in Photo Films is
The fastest acting enzyme in the biological kingdom is
Which of the following elements is non-radioactive?
Permanent hardness of water can be removed by adding
Glass is made from the mixture of
Which of the following elements is obtained from sea weeds ?
Quartz crystals normally used in quartz clocks etc. is chemically
The most important ore of Aluminium is
The fastest-running terrestrial animal is
Polythene is industrially prepared by the polymerisation of
Carbon tetrachloride fire extinguisher should not be used in closed room because it produces poisonous…
Which of the following is in liquid form at room temperature ?
Which of the following is commonly called a polyamide ?
Earth's seasons are caused by which of the following?
Which of the following items will be attracted to the north pole of a permanent magnet by a magnet force?
According to Daltons atomic theory the smallest particle which can exist independently is
Old-written material, which cannot be read easily can be read by
One fathom is equal to
The solar eclipse occurs when
The metal used in storage batteries
The intencity of Earthquakes is measured on
Which of the following parts of the sun is easily visible only during a total solar eclipse?
The hardest substance available on earth is
Brass gets discoloured in air due to the presence of which gas in air
The type of glass used in making prisms and lenses is
Epoxy resins is used as
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