1. Quartz crystals used in clocks are
sodium silicate
silicon dioxide
germanium oxide
titanium dioxide
2. Bromine is a
colourless gas
brown solid
highly inflammable gas
red liquid
3. Gases used in welding are
oxygen and hydrogen
oxygen and nitrogen
oxygen and acetylene
hydrogen and acetylene
4. Galvanized iron pipes have a coating of
zinc
mercury
lead
chromium
5. The wavelength of visible spectrum is in the range.
1300 Å ñ 3900 Å
3900 Å ñ 7600 Å
7800 Å ñ 8200 Å
8500 Å ñ 9800 Å
6. Detergents used for cleaning clothes are
carbonates
bicarbonates
bismuthates
sulfonates
7. The element excreted through human sweat is
sulfur
iron
magnesium
zinc
8. Blue vitriol is chemically
sodium sulfate
nickel surface
copper sulfate
iron sulfate
9. The positively charged part at the centre of in atom is called as
proton
neutron
electron
nucleus
10. The conversion of a solid directly into gas is called as
sublimation
condensation
evaporation
boiling
11. In human system, insulin controls the metabolism of
fats
carbohydrates
proteins
nucleic acids
12. The antibiotic among the following is
penicillin
aspirin
paracetamol
sulfadiazine
13. Which of the following is mostly carbohydrate?
Wheat
Barley
Rice
Maize
14. The heaviest metal among the following is
gold
silver
mercury
platinum
15. Stainless steel is an alloy of
iron and nickel
iron and chromium
copper and chromium
iron and zinc
16. To protect broken bones, plaster of Paris is used. It is
slaked lime
calcium carbonate
calcium oxide
gypsum
17. A hydrocarbon in which two carbon atoms are joined by a double bond is called as an
alkane
alkene
alkyne
ionic bond
18. The chemical name for vinegar is
methanol
ethanol
acetic acid
ethyl acetate
19. The acid used in a car battery is
acetic acid
hydrochloric acid
nitric acid
sulfuric acid
20. The gas, which comes out on opening a soda water bottle, is
carbon dioxide
hydrogen
nitrogen
sulfur dioxide
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