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- Question
Pick out the wrong statement.
Options- A. Biological oxygen demand (B.O.D.) value of a sewerage sample is always lower than its chemical oxygen demand (C.O.D.) value.
- B. Environmental pollution by NOx emission is much higher by four stroke petrol engines as compared to the two stroke engines.
- C. Temperature in stratosphere rises with increasing altitude.
- D. The characteristic of a green house body is that it allows the long wavelength incoming solar radiation to come in but does not allow the short wavelength infra red radiation to escape out of the earth's atmosphere.
- Correct Answer
- The characteristic of a green house body is that it allows the long wavelength incoming solar radiation to come in but does not allow the short wavelength infra red radiation to escape out of the earth's atmosphere.
- 1. Pure aniline is evaporating through a stagnant air film of 1 mm thickness at 300 K and a total pressure of 100 KPa. The vapor pressure of aniline at 300 K is 0.1 KPa. The total molar concentration under these conditions is 40.1 mole/m3 . The diffusivity of aniline in air is 0.74xl0-5m2/s.The numerical value of mass transfer co-efficient is 7.4 x 10-3. The rate of evaporation of aniline is 2.97 x 10-4. Its units are
Options- A. mole/s
- B. mole/cm2. s
- C. mole/m2 . s
- D. kmole/m2 . s Discuss
- 2. The heat of adsorption of a gas caused by Van der Walls forces of attraction and capillarity is equal to the heat of
Options- A. normal condensation.
- B. wetting.
- C. sum of (a) and (b).
- D. difference of (a) and (b). Discuss
- 3. Under conditions of equal reduced pressure and equal reduced temperature, substances are said to be in the 'corresponding states'. At equal reduced conditions i.e., at the corresponding state, the __________ of different gases are nearly the same.
Options- A. compressibility
- B. molecular weight
- C. humidity
- D. none of these Discuss
- 4. In sweetening process, solutizer agent used with caustic alkali is
Options- A. potassium isobutyrate
- B. sodium plumbite
- C. methanol
- D. phenol Discuss
- 5. Rivets are generally specified by the
Options- A. head diameter
- B. shank diameter
- C. overall length
- D. none of these Discuss
- 6. In case of plain carbon steel, butt welded joints are used for shell plate thickness ? __________ cms.
Options- A. 1.2
- B. 0.5
- C. 3.8
- D. 6.8 Discuss
- 7. The main function of a muffle in the muffle furnace is to
Options- A. protect the charge from the effects of the products of combustion.
- B. smooth out temperature inequalities on the combustion side of the muffle wall.
- C. both (a) & (b)
- D. neither (a) nor (b) Discuss
- 8. Smoke point of a test sample of kerosene is found to be 15 mm. On removal of __________ from it, the smoke point rises to 25 mm.
Options- A. n-paraffins
- B. olefins
- C. aromatics
- D. none of these Discuss
- 9. Heating of orthophosphoric acid to 250°C produces
Options- A. metaphosphoric acid
- B. pyrophosphoric acid
- C. no change in it
- D. none of these Discuss
- 10. Total energy at a point comprises of __________ energy.
Options- A. potential & kinetic
- B. pressure
- C. internal
- D. all (a), (b) & (c). Discuss
More questions
Correct Answer: kmole/m2 . s
Correct Answer: sum of (a) and (b).
Correct Answer: compressibility
Correct Answer: potassium isobutyrate
Correct Answer: shank diameter
Correct Answer: 3.8
Correct Answer: both (a) & (b)
Correct Answer: aromatics
Correct Answer: pyrophosphoric acid
Correct Answer: all (a), (b) & (c).
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