131 Q) "Which one of the following is correct? Setting of plaster of Paris is
"
(a)dehydration
(b)oxidation with atmospheric oxygen
(c)hydration leading to another hydrate
(d)combination with atmospheric carbon dioxide
132 Q) At the very low temperature, ice forms
(a)tetrahedral crystal
(b)cubic crystal
(c)hexagonal crystal
(d)None of the above
133 Q) Food wrapped in newspaper is likely to get contaminated with
(a) aluminium
(b) lead
(c) iron
(d) magnesium
134 Q) "Consider the following statements
I.Dry ice is the solid form of CO2.
II.Dry ice is used primarily as a cooling agent.
III.Water ice is colder than dry ice.
Which of the statements given above is/are correct?"
(a) Only I
(b) Only II
(c) I and II
(d) I, II and III
135 Q) " Assertion (A) Nitric acid is used in the production of fertilizers.
Reason (R) Sulphuric acid is used in the production of explosive."
(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
136 Q) "With reference to the usefulness of the by-products of sugar industry, which of the following statements is/are correct?
1. Bagasse can be used as biomass fuel for the generation of energy.
2.Molasses can be used as one of the feedstocks for the production of synthetic chemical fertilizers.
]3. Molasses can be used for the production of ethanol.
Select the correct answer using the codes given below."
(a) Only 1
(b) 2 and 3
(c) 1 and 3
(d) 1, 2 and 3
137 Q) The bonding between the nitrogenous bases of one strand with another strand of DNA is done by
(a)covalent bond
(b)van der Waals' interaction
(c)hydrogen bond
(d) ionic bond
138 Q) Which one among the following when dissolved in water give hissing sound?
(a) Limestone
(b)Sodalime
(c) Slaked lime
(d)Quick lime
139 Q) Which one among the following would expand the most on being heated?
(a) Water
(b) Air
(c) Alcohol
(d) Glass
140 Q) If a limestone piece is dipped in water, bubbles evolve. The bubbling is due to
(a) hydrogen
(b)oxygen
(c) water vapour
(d)carbon dioxide
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