Q 1. What is laughing gas?
Q 2. The two elements that are frequently used for making transistors are?
Q 3. The filament of an electric bulb is made of ?
Q 4. Diamond is an allotropic form of ?
Q 5. In fireworks, the green flame is produced because of ?
Q 6. Permanent hardness of water can be removed by adding ?
Q 7. Marsh gas is ?
Q 8. LPG consists of mainly ?
Q 9. Production of chlorofluorocarbons (CFC) gas which is proposed to be banned in India, is used in which of the following domestic products?
Q 10. Which of the following does not contain a coinage metal?
Nitrous Oxide
Carbon monoxide
Sulphur dioxide
Hydrogen peroxide
Q 2. The two elements that are frequently used for making transistors are?
boron and aluminium
silicon and germanium
iridium and tungsten
niobium and columbium
Q 3. The filament of an electric bulb is made of ?
tungsten
nichrome
graphite
iron
Q 4. Diamond is an allotropic form of ?
germanium
carbon
silicon
sulphur
Q 5. In fireworks, the green flame is produced because of ?
sodium
barium
mercury
potassium
Q 6. Permanent hardness of water can be removed by adding ?
chlorine
washing soda
potassium permanganate
bleaching powder
Q 7. Marsh gas is ?
nitrogen
ethane
methane
hydrogen
Q 8. LPG consists of mainly ?
methane, ethane and hexane
ethane, hexane and nonane
methane, hexane and nonane
methane, butane and propane
Q 9. 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 10. Which of the following does not contain a coinage metal?
Silver and Gold
Zinc and Gold
Copper and Silver
Copper and Gold
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