1.The process of nitrogen fixation by bacteria does not take place in the presence of-
A.Molecular form of hydrogen
B.Elemental form of hydrogen
D.Elemental form of nitrogen
2.Differentiation in segmental fashion occurs in-
3.Hard calcium carbonate structures are used as skeleton by-
4.The mercury barometer was invented by-
5.Atmospheric pressure is measured by a-
D.None of these
6.An ice cube is floating in a glass of water. What happen to the water to the water level when the ice melts?
D.First rises and then falls
7.Which of the following is a property of ceramics?
A.Ceramics are poor conductors of heat
B.Ceramic are poor conductor of electricity
C.Ceramic can withstand very high temperature
D.Ceramic are good conductors of electricity
8.Which type of glass darkens in bright light and when the intensity of light decreases the darkness of glass is diminished?
C.Photo chromatic glass
D.Lead crystal glass
9.Calciferol is the name of-
10.Which of the following is not a thermoplastic polymer?