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Rust is
A. A mixture of FeO and Fe(OH)2
B. A mixture of Fe2O3 and Fe(OH)2
C. A mixture of Fe2O3, 3H2O and FeO
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4
Which of the following items will be attracted to the north pole of a permanent magnet by a magnet force?
A. A piece of iron that is not a permanent magnet
B. The north pole of another permanent magnet
C. A positively charged glass rod
D. A negatively charged rubber rod
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4
What is the unit for measuring the pitch or frequency of sound ?
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The property of a substance to absorb moisture from the air on exposure is called
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Pollination by birds is called
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The metallic constituents of hard water are
A. Calcium, magnesium and iron
B. Magnesium, Calcium and tin
C. Magnesium, tin and iron
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4
The oxide of Nitrogen used in medicine as anaesthetic is
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The fastest acting enzyme in the biological kingdom is
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Permanent hardness of water, due to sulphates of the metal, can be destroyed by the use of
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Which of the following elements is non-radioactive?
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Polythene is industrially prepared by the polymerisation of
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According to Daltons atomic theory the smallest particle which can exist independently is
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Liquefied Petroleum gas (LPG) consists of mainly
A. Methane, Butane and Propane
B. Methane, Ethane and Hexane
C. Ethane, Hexane and Nonane
D. Methane, Hexane and Nonane
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The formula of Plaster of Paris is
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The speed of light with the rise in the temperature of the medium
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Brass gets discoloured in air due to the presence of which gas in air
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Epoxy resins is used as
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Carbon tetrachloride fire extinguisher should not be used in closed room because it produces poisonous glass called
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The marine animal called dugong which is vulnerable to extinction is a/an
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Old-written material, which cannot be read easily can be read by
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The metal used in storage batteries
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Which of the following is the lightest metal ?
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Permanent hardness of water can be removed by adding
A. Potassium Permanganate
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Which of the following elements is a metal
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Cell membrane is
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Water has maximum density at
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When a gas is turned into a liquid, the process is called
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The hardest substance available on earth is
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Which of the following elements is obtained from sea weeds ?
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The location and energy of an electron in an atom can be specified by