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Q.1
Chemical formula for water is
NaA1O
2
H
2
O
Al
2
O
3
CaSiO
3
Q.2
Light year is a measurement of
Speed of aeroplanes
Speed of light
Stellar distances
Speed of rockets
Q.3
Amalgams are:
Highly coloured alloys
Alloys which contain mercury as one of the contents
Alloys which have great resistance to abrasion
Alloys which contain carbon
Q.4
What is the unit for measuring the amplitude of a sound?
Decibel
Coulomb
Hum
Cycles
Q.5
Which of the following is the lightest metal?
Mercury
Lithium
Lead
Silver
Q.6
Which of the following metals remain in liquid for under normal conditions?
Radium
Zinc
Uranium
Mercury
Q.7
Reading of a barometer going down is an indication of
Snow
Storm
Intense heat
Rainfall
Q.8
Decibel is the unit for
Speed of light
Radio wave frequency
Intensity of sound
Intensity of heat
Q.9
Potassium Permanganate is used for purifying drinking water, because
It is a sterilising agent.
It dissolves the impurities of water.
It is a reducing agent.
It is an oxidising agent.
Q.10
Which of the following is an element?
Ruby
Sapphire
Emerald
Diamond
Q.11
One fathom is equal to
6 feet
6 meters
60 feet
100 cm
Q.12
Fathom is the unit of
Sound
Depth
Frequency
Distance
Q.13
Which metal pollute the air of a big city?
Copper
Chromium
Lead
Cadmium
Q.14
Bell metal is an alloy of
Nickel and Copper
Zinc and Copper
Brass and Nickel
Tin and Copper
Q.15
LPG consists of mainly:
Methane, Ethane and Hexane
Ethane, Hexane and Nonane
Methane, Hexane and Nonane
Methane, Butane and Propane
Q.16
The filament of an electric bulb is made of
Tungsten
Nichrome
Graphite
Iron
Q.17
Monazite is an ore of
Titanium
Zirconium
Iron
Thorium
Q.18
Carbon, diamond and graphite are together called:
Allotrope
Isomers
Isomorphs
Isotopes
Q.19
The group of metals Fe, Co, Ni may best called as:
Transition metals
Main group metals
Alkali metals
Rare metals
Q.20
In which of the following activities silicon carbide is used?
Making cement and glass
Disinfecting water of ponds
Cutting very hard substances
Making casts for statues
Q.21
Water is a good solvent of ionic salts because:
It has a high specific heat
It has no colour
It has a high dipole moment
It has a high boiling point
Q.22
Air is a/an:
Compound
Element
Electrolyte
Mixture
Q.23
Production of chlorofluorocarbons (CFC) gas which is proposed to be banned in India, is used in which of the following domestic products?
Television
Refrigerator
Tube light
Cooking gas
Q.24
Diamond is an allotropic form of:
Germanium
Carbon
Silicon
Sulphur
Q.25
In fireworks, the green flame is produced because of
Sodium
Barium
Mercury
Potassium
Q.26
Which of the following are the ingredients of gun metal?
Iron, Zinc and Titanium
Iron and Tin
Iron, Brass and Tin
Copper, Tin and Zinc
Q.27
The most important ore of aluminum is
Galena
Calamine
Calcite
Bauxite
Q.28
Potassium nitrate is used in
Medicine
Fertilizer
Salt
Glass
Q.29
Permanent hardness of water may be removed by the addition of:
Sodium Carbonate
Alum
Potassium Permanganate
Lime
Q.30
Heavy water is:
Deuterium oxide
PH7
Rain water
Tritium oxide
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