The maximum CO2 is emitted into the atmosphere by_________________?

Related Mcqs:

1. Choose the condition that must be specified in order to liquify CO2 (triple point for CO2 is – 57°C and 5.2 atm) ?

   A. Pressure must be kept below 5.2 atm
   B. Temperature must be kept above – 57°C
   C. Pressure must be kept below 5.2 atm. and temperature must be kept above 57°C
   D. Pressure and temperature must be kept below 5.2 atm. and – 57°C respectively

2. Consider the reaction, C + O2 ⇌ CO2; ΔH = – 94 kcal. What will be the value of ΔH for the reaction CO2 → C + O2 ?

   A. -94 kcal
   B. +94 kcal
   C. > 94 kcal
   D. < -94 kcal

3. The combustion equations of carbon and carbon monoxide are as follows: C + O2 = CO2, ΔH = – 394 kJ/kg .mole CO + ½ O2 = CO2, ΔH = – 284.5 kJ/kg. mole. The heat of formation of CO is _____________ kJ/kg. mole?

   A. -109.5
   B. +109.5
   C. +180
   D. +100

4. Assuming that CO2 obeys perfect gas law, calculate the density of CO2 (in kg/m3) at 263°C and 2 atm ?

   A. 1
   B. 2
   C. 3
   D. 4

5. Forward reaction will be favoured for the exothermic reaction, represented by CO + H2O ⇌ CO2 + H2, by_________________?

   A. Low temperature and high pressure
   B. Low temperature and low pressure
   C. High temperature and high pressure
   D. High temperature and low pressure

6. The density of the gases (present in air) decreases with increasing altitude to such an extent, that about 70% of the mass of atmospheric air is found in the lower 5 km. of the atmosphere. This lower region of atmosphere is called the_________________?

   A. Ionosphere
   B. Troposphere
   C. Stratosphere
   D. None of these

7. Maximum allowable concentration of CO2 in air for safe working is _____________ ppm (parts per million)?

   A. 50
   B. 1000
   C. 2000
   D. 5000

8. Noise emitted by a ventilation fan at a distance of 3 metres is about _____________ decibels?

   A. 85
   B. 105
   C. 125
   D. 145

9. Which of the following is the common pollutant emitted from metallurgical smelters, thermal power plant and cement plants ?

   A. NOx
   B. Hg
   C. SO2
   D. F

10. Which of the following is a green house gas other than CO2 ?

    A. Methane
    B. Nitrous oxide
    C. Chlorofluoro carbons (CFC)
    D. All A., B. and C.