71 Q) The most abundant metal in the Earth's crust is
(a) Si
(b) Fe
(c) A1
(d) Cu
72 Q) A pale blue gas with a fish-like odour restores the colour of a blackened lead painting. The gas is also used as rocket fuel. It is
(a)oxygen
(b)ammonia
(c) sulphur dioxide
(d) ozone
73 Q) Which one of the following is used to slow down the speed of the neutrons in the nuclear reactor?.
(a)Controlling rod
(b) Moderator
(b)Coolant
(d) Accelerator
74 Q) "Assertion (A) During setting of cement, the structure has to be cooled by spraying water.
Reason (R) The constituents of the cement undergo hydration during setting of cement and it is an exothermic reaction."
(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
75 Q) "Which one among the following substances evolved heat when dissolved in water?
"
(a) Glucose
(b) Fructose
(c) Quick lime
(d) Salt peter
76 Q) Which one of the following is correct? Butter is?
(a)a supercooled oil
(b) an emulsion
(c) a molecular solid
(d) a gel
77 Q) "Consider the following statements
I.Photochromic lenses are lenses that darken on exposure to ultraviolet light.
II.Photochromic properties is due to embedded microcrystalline of silver chloride in the glass.
Which of the statements given above is/are correct?."
(a)Only I
(b) Only II
(c)Both I and II
(d) Neither I nor II
78 Q) Match the Following
|
List 1 (Names)
|
List II (Compounds)
|
|
A.
Baking soda
|
1.
Sodium nitrate
|
|
B.
Washing soda
|
2.
Calcium hydroxide
|
|
C.
Chile saltpeter
|
3.
Sodium carbonate
|
|
D.
Slack lime
|
4.
Sodium bicarbonate
|
(a) 2 4 3 1
(b) 2 3 4 1
(c) 4 3 1 2
(d) 4 1 3 2
79 Q) "Assertion (A) Atomic hydrogen is stronger reducing agent than nascent hydrogen.
Reason (R) Atomic hydrogen is obtained by thermal decomposition of molecular hydrogen."
(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
80 Q) The rusting of iron nail
(a)decreases it weight
(b)increases its weight
(cj does not affect weight but iron is oxidised
(d)does not affect weight but iron is reduced
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