61 Q) "The bleaching action of chlorine occurs in the presence of
"
(a) moisture
(b) sunlight
(c) pure oxygen
(d) pure sulphur dioxide
62 Q) Which one among the following polymers is re-synthesised from the naturally occurring polymer?
(a) Kevlar
(b) Teflon
(c) Rayon
(d) Cellulose
63 Q) Which one of the following chemicals released along with domestic wastes has caused the phenomenon of Eutrophication' which leads to high productivity of water bodies?
(a)Phosphates and nitrates
(b)Sulphates and chlorides
(c)Chlorides and carbonates
(d)Bicarbonates and carbonates
64 Q) Which one of the following has been producing/can produce light by a chemical change?
(a) Electric bulb
(b) Moon
(c) Sun
(d) Lightning and thunder
65 Q) Which one of the following chemical compounds is responsible for the stimulation of tear glands by the onion?.
(a)A phosphate compound
(b)A nitrate compound
(c)A sulphide compound
(d)A chloride compound
66 Q) "Many communities put salt on their roads after a snowfall, Why?
"
(a)To enhance the freezing and hardening of snow
(b)To control the slipping of vehicles
(c)To keep the melted snow from refreezing
(d)None of the above
67 Q) "Assertion (A) All liquids are conductors of Electricity.
Reason (R) Linder the condition of low pressure and high voltage, liquids can be made conducting."
(a)Both A and R are true and R is the correct explanation of A
(b)Both A and R are true but R is not the correct explanation of A
(c)A is true but R is false
(d)A is false but R is true
68 Q) "Assertion (A) Apples have an anti-tumour action.
Reason (R) The benzene compounds contain in the apple have a great medicinal value."
(a)Both A and R are true and R is the correct explanation of A
(b)Both A and R are true but R is not the correct explanation of A
(c)A is true but R is false
(d)A is false but R is true
69 Q) "Consider the following statements
I.Glass wool has tensile strength greater than steel,
II.Glass wool is fire powder.
III.Glass wool has high electrical conductivity and absorbs moisture.
IV.Glass wool is used to prepare fire glass.
Which of the statements given above are correct?"
(a)I, II, III and IV
(b) I, II and III
(c) I, II and IV
(d) III and IV
70 Q) "Why hard water does not give lather with soap?
"
(a) Hard water contains calcium and magnesium ions, which form precipitate with soap
(b) Hard water contains sulphate and chloride ions, which form precipitate
(c) pH of hard water is high
(d) pH of hard water is less
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