Which of the following is in liquid form at room temperature ?
Sodium
Cerium
Francium
Lithium
Correct Answer :
C. Francium
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Methane, Ethane and Hexane
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In a certain electronic circuit the output is positive if input 1 is positive and input 2 is zero. If both inputs are positive the output is zero. This is
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an OR circuit
a high-pass filter
a NOR circuit
The metal used in storage batteries
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Which of the following elements is non-radioactive?
Uranium
Plutonium
Thorium
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Sand and salt
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None of these
One fathom is equal to
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6 metres
60 cms
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The formula of Plaster of Paris is
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CaSO4, 2H2O
2CaSO4, 4H2O
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Platinium
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semipermeable
selectively permeable
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What is the unit for measuring the pitch or frequency of sound ?
Coulomb
Hum
Cycles
Decible
Which of the following is most likely to cause a rise in the average temperature of earth's atmosphere in future?
Atomic warfare
Depletion of earth's ozone layer
CO2 from fossil fuels
Dust clouds from valcanoes
The intencity of Earthquakes is measured on
Beaufort scale
Secant scale
Mercalli scale
Richter scale
Old-written material, which cannot be read easily can be read by
None of these
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Infra Red rays
Cosmic Rays
The oxide of Nitrogen used in medicine as anaesthetic is
Nitric oxide
Nitrogen dioxide
Nitrogen pentoxide
Nitrous oxide
Polythene is industrially prepared by the polymerisation of
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ethylene
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The most important ore of Aluminium is
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Galena
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Permanent hardness of water can be removed by adding
Potassium Permanganate
Bleaching Powder
Chlorine
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The colour of Emerald is
Deep Green
Violet
Prussian Blue
Yellow
The speed of light with the rise in the temperature of the medium
Increases
Remains unaltered
Drops sharply
Decreases
The hardest substance available on earth is
Platinum
Quartz
gold
Diamond
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Carbon dioxide
Hydrogen Sulphide
Oxygen
Nitrogen
Water has maximum density at
0°C
-4°C
100°C
4°C
The chemial name of Uria is
Carbamide
Chloroetane
Aneurin
None of these
Which of the following is in liquid form at room temperature ?
Sodium
Cerium
Francium
Lithium
Rust is
A mixture of FeO and Fe(OH)2
A mixture of Fe2O3 and Fe(OH)2
A mixture of Fe2O3, 3H2O and FeO
FeO only
The removal of top soil by water or wind is called
Soil erosion
Soil wash
Silting of soil
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It burns in air to form water
It supports combustion
It readily combines with fluorine and chlorine
It combines with almost all metals forming hydrides
Quartz crystals normally used in quartz clocks etc. is chemically
A mixture of B and C
Silicon dioxide
Germenium dioxide
Sodium Silicate
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An atom
A cation
A molecule
An anion
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1H1
1H2
6C12
8O16