12th class (Fsc) Chemistry unit 15 MCQs
76. The nitrogen present in fertilizers helps plants:
a. To produce protein
b. To fight against disease
c. To produce carbohydrates
d. To produce fat
77. The fertilizer which contain 46% N is:
a. Ammonium nitrate
b. Urea
c. Ammonia
d. None
78. Ammonium nitrate fertilizer is not used for which crops?
a. Sugar cane
b. Cotton
c. Paddy rice
d. Wheat
79. Percentage of nitrogen in urea is:
a. 46%
b. 76%
c. 86%
d. 56%
80. Phosphorus helps th growth og:
a. Stem
b. Root
c. Seed
d. Leave
81. Which substance in cement has greater percentage?
a. Lime
b. Silica
c. Alumina
d. Iron oxide
82. Which substance is added to air cooled cement clinker?
a. Gypsum
b. Day
c. Marble
d. Alumina
83. The percentage of lime in Portland cement is:
a. 62
b. 1.0
c. 60
d. 2.5
84. Which of the following compound is present in highest percentage in cement:
a. Na2O
b. Lime
c. Alumina
d. Clay
85. Which non-woody material is used for making pupl and paper:
a. Eucalyptus
b. Fur
c. Poplar
d. Corn straw
86. Which woody raw material is used for manufacture of paper pulp?
a. Poplar
b. Coron
c. Rice straw
d. Bagasse
87. Which is not used in paper and pulp industry?
a. Poplar
b. Bam,boo
c. He gas
d. Cotton stalk
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