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Online Test
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1. Quartz crystals normally used in quartz clocks etc. is chemically
silicon dioxide
germanium oxide
a mixture of germanium oxide and silicon dioxide
sodium silicate
2. Chemical formula for water is
NaAlO2
H2O
Al2O3
CaSiO3
3. Washing soda is the common name for
Sodium carbonate
Calcium bicarbonate
Sodium bicarbonate
Calcium carbonate
4. Bromine is a
black solid
red liquid
colourless gas
highly inflammable gas
5. Tetraethyl lead is used as
pain killer
fire extinguisher
mosquito repellent
petrol additive
6. Which of the following is used as a lubricant?
Graphite
Silica
Iron Oxide
Diamond
7. The variety of coal in which the deposit contains recognisable traces of the original plant material is
bitumen
anthracite
lignite
peat
8. Which of the following is a non metal that remains liquid at room temperature?
Phosphorous
Bromine
Chlorine
Helium
9. Which of the following is used in pencils?
Graphite
Charcoal
Silicon
Phosphorous
10. Brass gets discoloured in air because of the presence of which of the following gases in air?
Oxygen
Hydrogen sulphide
Carbon dioxide
Nitrogen
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