941. Function of sedimentation tank in sewage treatment is to?
A. Aerate the sewage
B. Remove water content
C. Remove suspended solids
D. Disinfect sewage
942. One of the constituents of tear gas is?
A. Ether
B. Ethanol
C. Ethane
D. Chloropicrin
943. Ozone consists of?
A. Oxygen and Carbon
B. Hydrogen and Carbon
C. Oxygen and Nitrogen
D. Oxygen only
944. Which one of the following metals does not react with water to produce hydrogen?
A. Cadmium
B. Potassium
C. Lithium
D. Sodium
945. Carbon monoxide is an inflammable gas. Which one of the following is also inflammable?
A. Nitrogen
B. Helium
C. Hydrogen
D. Oxygen
946. An atomic clock is based on transitions in?
A. Caesium
B. Sodium
C. Magnesium
D. Aluminium
947. Which of the following substances is highly plastic?
A. Mica
B. Granite
C. Quartz
D. Clay
948. Mortar is a mixture of water, sand, and?
A. Quicklime
B. Slaked lime
C. Limestone
D. Gypsum
949. What is the name of that system which uses radioactivity to decide the period of materials of prehistoric period?
A: Uranium dating
B: Radium dating
C: Carbon dating
D: Deuterium dating
950. Beryllium sulfate is less soluble in water due to?
A: Low energy of dissociation
B: Low inflammable energy
C: High inflammable energy
D: Ionic bond
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