GENERAL SCIENCE CHEMISTRY ONE LINERS FOR TNPSC UPSC SSC SET 039
381). An element A has valencies equal to 3 and 5. It combines with another element B having valency equal to 2. What are formulae of the compounds thus formed?
A). A5B3 and A2B5
B). A3B2 and A5B2
C). A2B3 and A2B5
D). A2B3 and A3B5
Answer: A2B3 and A2B5
382). What is the purpose of adding plastic zars in paint manufacturing process?
A). They act as a film-forming constituent
B). They reduce the viscosity
C). They prevent the polymerisation and condensation
D). They provide elasticity to the film and minimise its cracking
Answer: They provide elasticity to the film and minimise its cracking
383). Which one of the following is the Answer:statement? Graphite can be used as lubricant because it has
A). a rigid structure
B). low viscosity
C). layered structure
D). low melting point
Answer: layered structure
384). The oxide of which of the following element is used as a coolant?
A). Silicon
B). Nitrogen
C). Carbon
D). Phosphorus
Answer: Carbon
385). The atomic weights are expressed in terms 0f atomic mass unit. Which one of the following is used as a standard?
A). 1H1
B). 12C6
C). 16O8
D). 35Cl17
Answer: 12C6
386). The octet rule is not valid for which one of the following molecules?
A). CO2
B). H2S
C). NH3
D). BF3
Answer: BF3
387). Which fertiliser is assimilated directly by the plant?
A). Super phosphate
B). Nitrolim
C). Muriate of Potash
D). Humus
Answer: Humus
388). Which is the rarest naturally occuring element on the earth?
A). Gold
B). Annmony
C). Germanium
D). Astatine
Answer: Astatine
389). Which one of the following pairs of element is most essential for buildings
cells in the human body ?
A). Nitrogen and aluminium
B). Carbon and calcium
C). Nitrogen and carbon
D). Calcium and phosphorus
Answer: Carbon and calcium
390). which one of the following is not an allotrope of corban?
A). Soot
B). Graphite
C). Diamond
D). Carborandum
Answer: Soot
A). A5B3 and A2B5
B). A3B2 and A5B2
C). A2B3 and A2B5
D). A2B3 and A3B5
Answer: A2B3 and A2B5
382). What is the purpose of adding plastic zars in paint manufacturing process?
A). They act as a film-forming constituent
B). They reduce the viscosity
C). They prevent the polymerisation and condensation
D). They provide elasticity to the film and minimise its cracking
Answer: They provide elasticity to the film and minimise its cracking
383). Which one of the following is the Answer:statement? Graphite can be used as lubricant because it has
A). a rigid structure
B). low viscosity
C). layered structure
D). low melting point
Answer: layered structure
384). The oxide of which of the following element is used as a coolant?
A). Silicon
B). Nitrogen
C). Carbon
D). Phosphorus
Answer: Carbon
385). The atomic weights are expressed in terms 0f atomic mass unit. Which one of the following is used as a standard?
A). 1H1
B). 12C6
C). 16O8
D). 35Cl17
Answer: 12C6
386). The octet rule is not valid for which one of the following molecules?
A). CO2
B). H2S
C). NH3
D). BF3
Answer: BF3
387). Which fertiliser is assimilated directly by the plant?
A). Super phosphate
B). Nitrolim
C). Muriate of Potash
D). Humus
Answer: Humus
388). Which is the rarest naturally occuring element on the earth?
A). Gold
B). Annmony
C). Germanium
D). Astatine
Answer: Astatine
389). Which one of the following pairs of element is most essential for buildings
cells in the human body ?
A). Nitrogen and aluminium
B). Carbon and calcium
C). Nitrogen and carbon
D). Calcium and phosphorus
Answer: Carbon and calcium
390). which one of the following is not an allotrope of corban?
A). Soot
B). Graphite
C). Diamond
D). Carborandum
Answer: Soot
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