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- Question
Addition polymerisation takes place either by a free radical mechanism or ionic machanism depending on the reagents used. Free radical polymerisation is catelyzed by __________ , which decompose to give free radicals.
Options- A. organic peroxides
- B. sulphuric acid
- C. hydroflouric acid
- D. none of these
- Correct Answer
- organic peroxides
- 1. Grinding efficiency of a ball mill is of the order of __________ percent.
Options- A. 1-5
- B. 40-50
- C. 75-80
- D. 90-95 Discuss
- 2. Poly tetra flouro ethylene (PTFE) is known as
Options- A. dacron
- B. teflon
- C. bakelite
- D. celluloid Discuss
- 3. German silver used for decorative purposes contains maximum percentage of
Options- A. silver
- B. copper
- C. zinc
- D. nickel Discuss
- 4. Ammonium phosphate is a __________ fertiliser.
Options- A. nitrogenous
- B. phosphatic
- C. complex
- D. mixed Discuss
- 5. Radioactivity of an isotope is expressed in
Options- A. barn
- B. MeV
- C. Curie
- D. Ergs Discuss
- 6. Corrosion of metals can not be prevented by its
Options- A. tempering
- B. chromising
- C. aluminising
- D. alloying Discuss
- 7. The value of 'angle of nip' is generally about
Options- A. 16°
- B. 32°
- C. 52°
- D. 64° Discuss
- 8. Which is a neutral refractory?
Options- A. Graphite
- B. Magnesite chrome
- C. Silica
- D. Magnesia Discuss
- 9. Buna-S is also known as
Options- A. teflon
- B. PTFE
- C. SBR
- D. polycrylates Discuss
- 10. Viscosity of atmospheric air may be about __________ centipoise.
Options- A. 0.015
- B. 1.5
- C. 15
- D. 150 Discuss
More questions
Correct Answer: 1-5
Correct Answer: teflon
Correct Answer: copper
Correct Answer: mixed
Correct Answer: Curie
Correct Answer: tempering
Correct Answer: 32°
Correct Answer: Graphite
Correct Answer: SBR
Correct Answer: 0.015
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