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PG TRB Chemistry Model Questions and Answers

TRB Model Questions
 
5. The tendency of similar molecules to stick together is known as
 
  • A. Assimilation
  • B. Adhesion
  • C. Cohesion
  • D. Gravitation
Answer: C.
Cohesion
 
6. Diamond is chemically
 
  • A. A mixture of calcium and magnesium phosphates
  • B. A pure form of sand
  • C. A mixture of metal carbonates
  • D. Pure carbon
Answer: D.
Pure carbon
 
 
7. The element used in lead pencils is
 
  • A. Lead
  • B. Tin
  • C. Carbon
  • D. Zinc
Answer: C.
Carbon
 
8. Air contains what percentage of oxygen?
 
  • A. 21
  • B. 28
  • C. 37
  • D. 47
Answer: A.
21