A. Negative charge
B. Positive charge
C. Zero charge
D. Positive or negative charge depending upon the nature of the cell
Related Mcqs:
- Electrochemical corrosion can occur, only if ________________ is present in contact with metal?
A. Air
B. Oxygen
C. Liquid medium
D. Gaseous medium - Though tin occurs lower than iron in the electrochemical series, yet it is coated on steel for corrosion protection, because of its________________?
A. Lower cost
B. Abundant availability
C. Resistance to vegetable acids as the tin plate are commercially used in ‘canning’ industry
D. None of these - Particle nature of cathode rays is proved due to the fact that they ________________?
A. Travel in a straight line
B. Get deflected by magnetic electric field
C. Produce fluorescence
D. Heat the exposed material - Dew point temperature always gives an indication of the __________________ of the moist air ?
A. Dryness
B. Moisture content
C. Coolness
D. Latent heat - A solar cell converts the sunlight directly into ______________ energy?
A. Thermal
B. Electrical
C. Mechanical
D. Chemical - The Al2O3 content of cryolite in Hall-Heroult cell is maintained between _______________ percent ?
A. 2-5
B. 18-20
C. 12-15
D. 6-12 - 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 - Frother is added in the froth floatation cell used in ore beneficiation to stabilise the air bubbles (i.e., froth), which will hold the ore particles, but it does not affect the floatability of minerals. Which of the following is not used as a frother ?
A. Cresylic acid
B. Xanthaies
C. Pine oil
D. All A, B. & C. - Electrolytic reduction cell used for conversion of calcined Al2O3 to Al is a carbon lined furnace operating at 800-900 °C. The purpose of electric current supplied to the furnace is to___________________?
A. Achieve very high purity of aluminium (99.9%)
B. Keep the electrolyte in liquid condition by the generation of heat
C. Electrolytically dissociate alumina
D. Both B. & C. - In multipass welds, shot peening is done after each pass to__________________?
A. Close the surface porosity
B. Break the continuity of columnar grains
C. Flatten the weldment
D. Introduce texture in the weld
