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- Question
Vulcanisation of rubber
Options- A. decreases its tensile strength.
- B. increases its ozone & oxygen reactivity.
- C. increases its oil & solvent resistance.
- D. converts its plasticity into elasticity.
- Correct Answer
- converts its plasticity into elasticity.
- 1. Which of the following is a desirable characteristic of an instrument?
Options- A. High drift
- B. High fidelity
- C. High measuring lag
- D. Poor reproducibility Discuss
- 2. A pressure vessel is said to be made of 'thick' shell, if the ratio of its diameter to wall thickness is
Options- A. 10
- B. 10
- C. 20
- D. 20 Discuss
- 3. For existence of aquatic life in water, the dissolved oxygen content in it, should not be less than __________ ppm.
Options- A. 10000
- B. 5
- C. 500
- D. 1000 Discuss
- 4. Test piece for determination of RUL of a refractory is heated in a/an
Options- A. oxidising atmosphere
- B. reducing atmosphere
- C. electric furnace
- D. neutral atmosphere Discuss
- 5. __________ polymer is used for making unbreakable crockery.
Options- A. Thermoplastic
- B. Melamine
- C. Addition
- D. none of these Discuss
- 6. __________ is a copolymer.
Options- A. Nylon-66
- B. Polyrophylene
- C. PVC
- D. Poly tetra flouro ethylene Discuss
- 7. Petroleum deposits are detected by the.
Options- A. oil seepage at the surface of the earth.
- B. measuremet of density, elasticity and magnetic & electric properties of the rock in the crust of the earth.
- C. age & nature of rocks inside the crust of the earth.
- D. all (a), (b) and (c) Discuss
- 8. Hole diameter of the seive trays in the distillation column ranges from __________ mm.
Options- A. lto3
- B. 4 to 8
- C. 3 to 12.5
- D. 12.5 to 18.5 Discuss
- 9. Nylon-6 is a
Options- A. polyamide
- B. thermosetting resin
- C. polyester
- D. none of these Discuss
- 10. Elastic failure of a material occurs, when the tensile stress equals yield strength, yield point or the elastic limit. Also, the elastic failure occurs according to maximum strain theory, when the maximum tensile strain equals (where, ? = yield strength and E = modulus of elasticity)
Options- A. E
- B. ?
- C. ?/E
- D. E/? Discuss
More questions
Correct Answer: High fidelity
Correct Answer: 10
Correct Answer: 5
Correct Answer: electric furnace
Correct Answer: Melamine
Correct Answer: Nylon-66
Correct Answer: all (a), (b) and (c)
Correct Answer: 3 to 12.5
Correct Answer: polyamide
Correct Answer: ?/E
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