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- Question
Which of the following is the most major constituents of air pollutants?
Options- A. Oxides of sulphur
- B. Oxides of nitrogen
- C. Carbon monoxide
- D. Hydrogen sulphide
- Correct Answer
- Oxides of sulphur
- 1. The value of the gas-law constant 'R' is 1.987
Options- A. kcal/kg-mole.°C
- B. Btu/lb-mole.°R
- C. kcal/kg-mole.°K
- D. both (b)& (c) Discuss
- 2. Pick out the wrong statement.
Options- A. ?-particle emission from a radioactive element makes it electrically negative.
- B. ?-particle emission from a radioactive element makes it electrically positive.
- C. A radioactive element having a half life period of 20 years will completely disintegrated in 40 years.
- D. The disintegration constant of a radioactive isotope is independent of pressure, temperature or concentration. Discuss
- 3. Pick out the wrong statement.
Options- A. Atomic heat capacities of the crystalline solid elements are nearly constant and equal to 6.2 kcal/kg-atom according to the law of Petit and Dulong.
- B. Atomic heat capacities of all solid elements decrease greatly with decrease in temperature, approaching a value of zero at absolute zero temperature, when in the crystalline state.
- C. Generally, the heat capacities of compounds are lower in the liquid than in the solid state.
- D. The heat capacity of a heterogeneous mixture is an additive property, but when solutions are formed, this additive property may no longer exist. Discuss
- 4. Si percentage in silica refractories used in the walls of coke oven is about
Options- A. 45
- B. 60
- C. 80
- D. 95 Discuss
- 5. Threshold limit value (TLV) i.e., the maximum permissible safe limit of phosgene gas which Hitler used to use to kill his enemies in 'gas chamber' is about __________ ppm.
Options- A. <1
- B. 10-100
- C. 100-200
- D. 100-1000 Discuss
- 6. A vapor whose partial pressure is less than its equilibrium vapor pressure is called a __________ vapor.
Options- A. saturated
- B. supersaturated
- C. superheated
- D. none of these Discuss
- 7. If pH value of a solution is 8, then its pOH value will be
Options- A. 6
- B. 1
- C. 7
- D. 10 Discuss
- 8. Liquid/petroleum fuel storage tanks are built underground (as in case of petrol pumps), when the storage capacity is less than __________ kilolitres.
Options- A. 20
- B. 30
- C. 45
- D. 85 Discuss
- 9. In a distillation column, the minimum residence time for liquid in the downspout is about __________ seconds.
Options- A. 1
- B. 8
- C. 80
- D. 180 Discuss
- 10. If 'D' is the inside diameter of the shell of a shell and tube heat exchanger, then the baffle spacing is usually in the range of
Options- A. D/2 or minimum 2" to 5D.
- B. D/5 or minimum 2" to 5D.
- C. D/5 or minimum 2" to D.
- D. none of these. Discuss
More questions
Correct Answer: both (b)& (c)
Correct Answer: A radioactive element having a half life period of 20 years will completely disintegrated in 40 years.
Correct Answer: Generally, the heat capacities of compounds are lower in the liquid than in the solid state.
Correct Answer: 95
Correct Answer: <1
Correct Answer: superheated
Correct Answer: 6
Correct Answer: 45
Correct Answer: 8
Correct Answer: D/5 or minimum 2" to 5D.
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