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- Question
Presence of nitrogen in high concentration in contaminated air reduces partial pressure of oxygen in lungs, thereby causing asphyxia (suffocation) leading to death from oxygen deficiency. Concentration of N2 in contaminated air at which it acts as a natural asphyxant is ? __________ percent.
Options- A. 84
- B. 88
- C. 80
- D. 92
- Correct Answer
- 84
- 1. The important dimensional group involved in the power requirement calculation in mixing operation is the __________ number.
Options- A. Reynold's
- B. Froude
- C. both (a) & (b)
- D. neither (a) nor (b) Discuss
- 2. Which of the following is a batch sedimentation equipment?
Options- A. Dust catcher
- B. Filter thickener
- C. Dry cyclone separator
- D. Rotary sprayer scrubber. Discuss
- 3. Choke crushing (in case of a Jaw crusher) compared to free crushing
Options- A. results in increased capacity.
- B. consumes less power.
- C. consumes more power.
- D. both (a) and (c). Discuss
- 4. Hydrogen differs from deuterium in __________ properties.
Options- A. radioactive
- B. physical
- C. chemical
- D. all (a), (b) and (c) Discuss
- 5. Separation of isotopes is generally done using a/an __________ centrifuge.
Options- A. ultra
- B. disk-bowl
- C. both (a) & (b)
- D. neither (a) nor (b) Discuss
- 6. Flue gas outlet temperature from the chimney of any furnace should be ideally about __________ °C.
Options- A. 50
- B. 100
- C. 150
- D. 250 Discuss
- 7. Low temperature carbonisation
Options- A. is mainly for producing the smokeless domestic coke.
- B. is meant for the production of 'metallurgical coke'.
- C. produces higher quantity of gas than high temperature carbonisation.
- D. produces less quantity of tar than high temperature carbonisation. Discuss
- 8. The osmotic pressure of a solution is directly proportional to the
Options- A. lowering of vapor pressure.
- B. molecular concentration of the solute.
- C. absolute temperature of a given concentration.
- D. all (a), (b) and (c). Discuss
- 9. The vapor pressure of a substance, at its melting point, is __________ in the solid state as compared to that in the liquid state.
Options- A. less
- B. more
- C. same
- D. either (a) or (b); depends on the nature of the substance Discuss
- 10. Two solutions A1 and A2 have pH value of 2 and 6 respectively. It implies that the solution
Options- A. A2 is more alkaline than solution A2
- B. A1 is highly acidic.
- C. A1 is very slightly acidic.
- D. both (a) &(c). Discuss
More questions
Correct Answer: both (a) & (b)
Correct Answer: Filter thickener
Correct Answer: consumes more power.
Correct Answer: physical
Correct Answer: ultra
Correct Answer: 150
Correct Answer: is mainly for producing the smokeless domestic coke.
Correct Answer: all (a), (b) and (c).
Correct Answer: same
Correct Answer: both (a) &(c).
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