Q.1:- Which one amongst the following is not a Green House Gas ?
- Nitrogen
- Carbon Dioxide
- Carbon Monoxide
- Chloro Fluoro Carbons
Q.2:- Which of the following gases is mixed with Oxygen for breathing by divers in aqualungs ?
- Methane
- Nitrogen
- Helium
- Hydrogen
Q.3:- The material known in commerce as Terylene is a ?
- Synthetic fibre
- Natural Fibre
- Modified natural fibre
- Blend of cotton and silk
Q.4:- The metal extracted from Bauxite is ?
- Silver
- Copper
- Manganese
- Aluminium
Q.5:- Name two elements that find wide application in transistor industry ?
- Silicon and Germanium
- Carbon and Platinum
- Iridium and Germanium
- Tungsten and Platinum
Q.6:- If lime water is kept in the air, it turns milky due to presence of ?
- Carbon Dioxide
- Nitrogen
- Oxygen
- Sulphur Dioxide
Q.7:- The function of skimming tank in sewage treatment is to remove ?
- Oil and fatty substances
- Suspended solids
- Gritty substances
- Inorganic substances
Q.8:- Which one of the following is an example of a gel ?
- Cheese
- Milk
- Face Cream
- Shaving Cream
Q.9:- Charcoal is used in water treatment as a / an ?
- Absorbent
- Coagulant
- Solvent
- Adsorbent
Q.10:- Which of the following is caused by the higher concentration of Nitrogen and Phosphorus ?
- Eutrophication
- Hardness
- Alkalinity
- Acidity
Q.11:- Why is water not suitable for putting out a petrol fire ?
- The oxygen content of water is isolated by petrol and thus it helps in burning
- Petrol is too inflammable to be extinguished by water
- The heat required for combustion of petrol is very low
- Water, being heavy, slips below petrol which thus remains in contract with air and burns
Q.12:- Iron is extracted from ?
- Cinnabar
- Haematite
- Bauxite
- Dolomite
Q.13:- The rusting of Iron is a / an ?
- Physical Change
- Electrochemical Change
- Electrical Change
- None of the above
Q.14:- Water cycle refers to ?
- An integrated attempt to recycle water in relatively arid regions
- Constant movement of water from ocean to land and back to ocean once again
- Scientific management of water in areas excessively plagued with water logging
- Water distribution in relatively dry areas
Q.15:- What is the second largest component in milk ?
- Fat
- Minerals
- Water
- Sugar
Q.16:- Laughing gas is ?
- Nitric Oxide
- Nitrous Oxide
- Nitrogen Trioxide
- Nitrogen Pentoxide
Q.17:- Synthetic detergents are made from ?
- Sodium Stearate
- Sodium salt of Benzene Sulphonic Acid
- Sodium salt of Benzene Carboxylic Acid
- Sodium Palmitate
Q.18:- Choose the incorrect statement pertaining to organic compounds ?
- They have low melting and boiling points
- They do not dissolve in water
- They are not easily combustible
- They contain mainly Carbon and Hydrogen
Q.19:- If the sewage is fully Oxidized, the Nitrogen is in the form of ?
- Nitrites
- Ammonia
- Nitramines
- Nitrates
Q.20:- When Arsenic atoms are added to Germanium lattice, it becomes a/an ?
- Insulator
- Superconductor
- Intrinsic Semiconductor
- Extrinsic Semiconductor
Q.21:- The non-metal found in the liquid state is ?
- Bromine
- Nitrogen
- Fluorine
- Chlorine
Q.22:- Which is not an anaesthetic agent in surgical operations ?
- Chloroform
- Ether
- Nitrous Oxide
- Acetone
Q.23:- In an Oxygen molecule, two atoms are united by ?
- One bond
- Two bonds
- Three bonds
- Four bonds
Q.24:- Which among the following is a covalent compound ?
- Calcium Chloride
- Magnesium Fluoride
- Sodium Chloride
- Carbon Tetrachloride
Q.25:- Natural rubber is a polymer of ?
- Vinyl Acetate
- Propene
- Isoprene
- Styrene
