Plants produce carbohydrates from the CO2 present in the atmosphere by_________________?

Related Mcqs:

1. Catalyst used in the catalytic converter employed in automobiles to convert CO into CO2 and for complete oxidation of un-burnt hydrocarbons is___________________?

   A. Nickel
   B. Cobalt
   C. Vanadium
   D. Platinum

2. Volumetric composition of flue gas analysed with the Orsat apparatus is : CO2 = 12%, O2 = 8%, CO = nil, N2 = 80%. This flue gas composition indicates that_________________?

   A. Pure oxygen has been used for combustion
   B. Nitrogen percentage in the fuel is very high
   C. Excess air has been used for combustion
   D. Hydrogen is not present in the fuel

3. Ammonia leakage in the refrigeration system is detected by_________________?

   A. Sulphur stick, which on detection gives white smoke
   B. Using chemical reagents
   C. Its smell
   D. Soap solution

4. Heat transfer to the water wall in a high pressure water wall type boiler furnace is mainly by_________________?

   A. Conduction
   B. Convection
   C. Radiation
   D. Both A. & B.

5. The mechanism involved in the removal of metal in drilling operation is by_________________?

   A. Compression
   B. Extrusion
   C. Shearing
   D. Both B & C

6. The emf of a Deniell cell “Zn | Zn2+ || Cu2+ | Cu” can be increased by_________________?

   A. Decreasing the surface area of the electrodes
   B. Increasing the concentration of zinc sulphate solution
   C. Increasing the surface area of the electrodes
   D. Increasing the concentration of copper sulphate solution

7. The efficiency of a Carnot heat engine operating between absolute temperatures T1 and T2 (when, T1 > T2) is given by (T1 – T2)/T1. The co-efficient of performance (CO.P.) of a Carnot heat pump operating between T1 and T2 is given by_________________?

   A. T1/(T1-T2)
   B. T2/(T1-T2)
   C. T1/T2
   D. T2/T1

8. Pressure required to increase the density of water by about 1% is ____________________ atmosphere?

   A. 10
   B. 50
   C. 200
   D. 1000

9. What is the critical radius of insulation (cms) for a metallic cylinder, if the convective heat transfer co-efficient with the ambient atmosphere is 5 W/m2. °K? Thermal conductivity of metal and insulation material are 40 and 0.1 W/m.°K respectively ?

   A. 2
   B. 8
   C. 10
   D. 40

10. The atmospheric temperature during melting of ice/snow (in the atmosphere)_________________?

    A. Decreases
    B. Increases
    C. Remain same
    D. May increase or decrease; depends on the altitude where snow melts