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Questions Asked in UPSC CAPF 2017

UPSC CAPF Solved Paper 2017

CAPF Answer Key 2017
7. Which one of the following statements about air pollution caused by diesel engines is correct
A)it produces large quantity of carbon mono oxide at lower and higher temperatures
B)it produces large quantity of nitrogen oxides at lower and higher temperatures
C)it produces large quantity of carbon monoxide at lower temperature in and nitrogen oxide at Higher temperature.
D) it produces large quantity of nitrogen monoxide at lower temperature in and carbon oxide at Higher temperature.
Answer: C)it produces large quantity of carbon monoxide at lower temperature in and nitrogen oxide at Higher temperature.
Diesel engines can produce black soot (or more specifically diesel particulate matter) from their exhaust. The black smoke consists of carbon compounds that have not burned because of local low temperatures where the fuel is not fully atomised.
The lean-burning nature of diesel engines and the high temperatures and pressures of the combustion process result in significant production of gaseous nitrogen oxides (NOx), an air pollutant that constitutes a unique challenge with regard to their reduction.

8. Which one of the following is a major effect of long term consumption of drinking water containing little (less than. 5 PPM) or no fluoride
A)cavity of tooth
B)erosion of nail
C)deformation of bone
D) Mottling of tooth
Answer: A)cavity of tooth
Fluoride helps prevent tooth decay by making the tooth more resistant to acid attacks from plaque bacteria and sugars in the mouth. It also reverses early decay.

9. Carborundum is used as an abrasive because
A) has high thermal conductivity
B) has low coefficient of expansion
C) has high chemical stability.
D) high stiffness
Answer: D) high stiffness

10. Which one of the following is not decomposed by bacterial action
A) vegetable remains
B) plastic material
C) material carcases
D) waste of flowers
Answer: B) plastic material

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