Discussion
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- Question
With increase in porosity, the thermal conductivity of a solid substance
Options- A. increases
- B. decreases
- C. remains unchanged
- D. may increase or decrease; depends on the solid
- Correct Answer
- decreases
- 1. Refined acetic acid storage vessel are made of
Options- A. copper
- B. aluminium
- C. high carbon steel
- D. nickel Discuss
- 2. Which is a basic refractory?
Options- A. Fireclay
- B. Silica
- C. Chrome magnesite
- D. None of these Discuss
- 3. Soaking pits are meant for heating steel
Options- A. ingots
- B. coils
- C. sheets
- D. slabs Discuss
- 4. Percentage of heavy water in ordinary water is around
Options- A. 0.015
- B. 7.54
- C. 0.71
- D. 32.97 Discuss
- 5. Density of low density polythene is about __________ gm/c.c.
Options- A. 0.38
- B. 0.56
- C. 0.81
- D. 0.91 Discuss
- 6. Rain coats are made of
Options- A. neoprene
- B. PVC
- C. polyurathane
- D. SBR Discuss
- 7. CaCO3 contains __________ percent of Ca by weight.
Options- A. 40
- B. 48
- C. 96
- D. 12 Discuss
- 8. Pick out the material having minimum Rittinger's number.
Options- A. Calcite
- B. Pyrite
- C. Quartz
- D. Galena Discuss
- 9. Average molecular weight of air is about
Options- A. 21
- B. 29
- C. 23
- D. 79 Discuss
- 10. Both tritium and deuterium have the same number of
Options- A. neutrons
- B. electrons
- C. protons
- D. nucleons Discuss
More questions
Correct Answer: aluminium
Correct Answer: Chrome magnesite
Correct Answer: ingots
Correct Answer: 0.015
Correct Answer: 0.91
Correct Answer: PVC
Correct Answer: 40
Correct Answer: Quartz
Correct Answer: 29
Correct Answer: neutrons
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