Q. Which one of the following statements is not correct?
1) Elements are defined by the number of protons they possess.
2) Isobars are atoms having the same atomic number but different mass number.
3) The mass number of an atom is equal to the number of nucleons in its nucleus.
4) Valency is the combining capacity of an atom.
Q. Which one of the following is essential in corrosion of iron metal?
1) Oxygen only
2) Oxygen and moisture
3) Hydrogen only
4) Hydrogen and moisture
Q. Which one of the following acids is used in the car-batteries?
1) Acetic Acid
2) Hydrochloric Acid
3) Sulphuric Acid
4) Nitric Acid
Q. Which one of the following is not a green house gas found naturally in the atmosphere?
1) Nitrogen oxide
2) Carbon dioxide
3) Methane
4) Ozone
Q. Which one of the following substances is not synthetic?
1) Fibroin
2) Lexan
3) Neoprene
4) Teflon
Q. Which of the following sub-stances is obtained from a tree?
1) Asafoetida
2) Bitumen
3) Tincal
4) None of the above
Q. Which of the following polymer is not a thermoplastic?
1) Teflon
2) Neoprene
3) Polystyrene
4) Polythene
Q. Which of the following statements is/ are correct -
I. The addition of oxygen to a substance is called oxidation.
II. The removal of hydrogen from a substance is called oxidation.
Correct code is -
1) Only I
2) Only II
3) I and II both
4) Neither I nor II is correct
Q. Which of the following is a form of 'Calcium Carbonate'?
I. Limestone
II. Marble
III. Chalk
IV. Egg-shells
Correct code is -
1) Only I
2) Only I, II and IV
3) Only I and II
4) I, II, III and IV
Q. Which of the following does not contribute to the acid rain?
1) Nitrogen Monoxide
2) Sulphur Dioxide
3) Carbon Monoxide
4) Carbon Dioxide
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