1091. Coke is made by heating Coal in the absence of air at ________.

A. 700-800 Degree centigrade
B. 900-950 Degree centigrade
C. 1000-1100 Degree centigrade *
D. 1700-1100 Degree centigrade

1092. In blood the percentage of water is __________.

A. 75%
B. 85%
C. 92% *
D. 95%

1093. As the temperature of ice rises, the ice melts and its density _________.

A. Decreases
B. Remain constant
C. Increases *
D. Increases upto 10 degree centigrade

1094. Water is a universal solvent for what reactions ?

A. Physical
B. Chemical
C. Nuclear
D. Biochemical *

1095. The volume percentage of nitrogen in air is ____________.

A. 60%
B. 67%
C. 74%
D. 78% *

1096. Nitrogen occurs in plants and animals in the form of __________.

A. Minerals
B. Fats
C. Carbohydrates
D. Proteins *

1097. Air contains volume of carbon dioxide approximately_______.

A. 3%
B. 33%
C. 0.3%
D. 0.03% *

1098. The gases which are used by divers as an artificial atmosphere are helium and __________.

A. Nitrogen
B. Oxygen *
C. Neon
D. Carbon Monoxide

1099. The second most abundant metal found in the earth’s crust is ________.

A. Iron *
B. Aluminium
C. Calcium
D. Sodium

1100. Which of the following is involved in blood clotting ?

A. Sodium
B. Magnecium
C. Calcium *
D. Potassium

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