21 Q) What type of reaction is carried out by the lipase in the digestion of fats?
(a) Reduction
(b)Dehydration
(c)Hydrolysis
(d)Calcification
22 Q) "Assertion (A) Lithium is used in the light weight electrical batteries of the type found in clocks and watches.
Reason (R) The mass of Li required to release 1 mole of electron is so small. "
(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
23 Q) Which one of the following compounds is frequently found packed with drying tubes?
(a)Calcium sulphate
(b)Magnesium chloride
(c)Calcium chloride
(d)Sodium thiosulphate
24 Q) "Metal used to make wires for safety fuses must have
"
(a) very low resistivity and high melting point
(b) high resistivity and low melting point
(c) low resistivity and low melting point
(d) high resistivity and high melting point
25 Q) Which of the following is not a natural polymer?
(a)Wool
(b) Silk
(c) Cotton
(d) Teflon
26 Q) The ultra pure metal is obtained by
(a) calcination
(b) sublimation
(c) zone refining
(d) None of these
27 Q) "Which one among the following polymers
is used to make personal armour such as combat helmets, ballistic face masks, and ballistic vests?"
(a) Teflon
(b) PVC
(c) Bakelite
(d) Kevlar
28 Q) "Assertion (A) A buffer solution is a mixture of a strong acid and its conjugate base or a strong base and its conjugate acid.
Reason (R) Buffer solutions keep the pH at a nearly constant 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
29 Q) "Which of the following gases in the atmosphere is/are responsible for acid rains?
I. Oxides of sulphur
II. Oxides of nitrogen
III. Oxides of carbon
Select the correct answer using the codes given below"
(a) I and II
(b) I and III
(c) Only II
(d) All of these
30 Q) Match the Following
|
List l
|
List II
|
|
(Elements)
|
(Ores/Minerals)
|
|
A.
Copper
|
1.
Corundum, Bauxite
|
|
B.
Iron
|
2.
Malachite, Azurite
|
|
C.
Lead
|
3.
Galena, Lanarkite
|
|
D.
Aluminium
|
4.
Haematite,Limonite
|
(a) 2 4 3 1
(b) 2 3 4 1
(C) 4 3 1 2
(d) 4 1 3 2
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