Environmental Engineering (Part-3) (General Engineering) (SSC JE)

Total Questions: 50

11. Approximate quantity of CO₂ in the atmosphere in PPM (parts per million) is: [RRB S.S.E (Bilaspur/Secunderabad) 21.12.2014 ]

Correct Answer: (d) 400
Solution:

Approximate quantity of CO₂ in the atmosphere in PPM (parts per million) is 400.

12. Government stipulates limit of concentration of sulphur dioxide in ambient air at 50 unit. [RRB S.S.E (Bilaspur/Secunderabad) 21.12.2014 ]

Correct Answer: (d) u g/m²
Solution:

Government stipulates limit of concentration of sulphur dioxide in ambient air at 50 mg/m³.

13. According to IPCC, three factors contributing to Global warming are? [RRB S.S.E (Bilaspur/Secunderabad) 21.12.2014 ]

Correct Answer: (d) Place them in the order of their contribution to global warming.
Solution:

According to the intergovernmental panel on climate (IPCC), the three factors contributing of global warming are indeed CO₂ emissions, change of land use including deforestation and non-veg food consumption. These factors can all contribute to the increase in green house gases in the atmosphere, trapping heat and leading of global warning.

14. In potable water, the dissolved oxygen is stipulated as– [RRB S.S.E (Bilaspur/Secunderabad) 21.12.2014 ]

Correct Answer: (d) > 6 mg/l
Solution:

The dissolved oxygen should be more than 6 ppm (mg/l) in potable water and minimum 5 ppp is required for aquatic life.

15. Which one of the following is NOT Biotic components of ecology? [RRB S.S.E (Bilaspur/Secunderabad) 21.12.2014 ]

Correct Answer: (d) Climate
Solution:

Biotic components of ecology/ecosystem
(i) Producers – Plants (green, algae, etc.)
(ii) Consumers – Animals (herbivores, carnivores, omnivores etc)
(iii) Decomposers – Bacteria
• Climate is not a component of ecology.

16. Match Col X (Result) and Col Y (Cause)/ [RRB S.S.E (Bilaspur/Secunderabad) 21.12.2014 ]

Correct Answer: (a) P – 2, Q – 1, R – 4, S – 3
Solution:

Pollution Cause
(i) Water pollution      Decreasing of organic matter
(ii) Air pollution      Combustion of fossil fuel
(iii) Noise pollution      High decibel
(iv) Soil pollution      Pesticides

17. In reference to Acid rain. What incorrect statement. [RRB S.S.E (Bilaspur/Secunderabad) 21.12.2014 ]

Correct Answer: (c) Maximum acid is due to strong carbonic acid
Solution:

Acid rain–
• The pH value of water is below 5.6
• It occurs due to presence of SO₂ and NO₂ in the atmosphere
• Acid rain affects ecosystem and structures made off lime or limestone. Note– Carbonic acid is a weak acid (H₂CO₃)

18. In Global Warming, the major contribution is due to? [RRB S.S.E (Bilaspur/Secunderabad) 21.12.2014 ]

Correct Answer: (a) Carbon emission
Solution:

Global warming–The phenomenon of a gradual increase in temperature near earth's surface is termed as global warming.
Causes–
(i) Carbon emission
(ii) Deforestation
(iii) CFC
(iv) Industrial development
(v) Agriculture
(vi) Population more than saturation.

19. Which one of the following is generally added to Table Salt to make it flow freely in rainy season? [RRB S.S.E (Bilaspur/Secunderabad) 21.12.2014 ]

Correct Answer: (a) Ca₃ (PO₄)₂
Solution:

Ca₃ (PO₄)₂ prevent the moisture so that it is added to table salt (NaCl) to make it flow freely, in rainy season. Here the meaning of 'flow' does not means 'flow like liquid'.

20. The most ideal disinfectant used for drinking water is: [RRB S.S.E (Bilaspur/Secunderabad) 21.12.2014 ]

Correct Answer: (b) Chlorine
Solution:

Disinfection– It is the process of destruction or inactivation of harmful micro-organism in water either by physical process or chemical process.
• The most ideal disinfectant used for drinking water is chlorine.