MCQs on Electrical Conductors, Arrhenius Theory and Ostwald’s Dilution Law
1. If a conductor length is increased, 100% then keeping all other parameters fixed, what will be the increase in power dissipate?
(a) 100%
(b) 200%
(c) 300%
(d) 400%
Answer::::(b)
2. What happens to the conductivity of semiconductors when there is an increase in temperature?
(a) decrease
(b) increase
(c) first, increase and then decrease
(d) remains constant
Answer::::(b)
3. Semiconductors have electrical conductivity
(a) more than metals but less than insulators
(b) less than thermistor but more than an insulator
(c) equal to the thermistor
(d) less than metals but more than typical insulators
Answer::::(d)
4. When temperature increases the conductance of conductors is
(a) decrease
(b) increase
(c) first, increase and then decrease
(d) remains constant
Answer::::(a)
5. When acids dissolve in water it releases
(a) H+ ion
(b) H– ion
(c) H3O+ ion
(d) H3O2+ ion
Answer::::(a)
6. Which element is always present in Arrhenius acid
(a) oxygen
(b) nitrogen
(c) hydrogen
(d) none of the above
Answer::::(c)
7. Ostwald’s dilution law is applicable to
(a) strong electrolytes only
(b) weak electrolytes only
(c) non-electrolytes
(d) strong as well as weak electrolytes
Answer::::(b)
8. In the titration of iodine against hype the indicator used is
(a) starch
(b) potassium ferricyanide
(c) methyl orange
(d) methyl red
Answer::::(a)
9. One litre of 0.5M KCl solution is electrolysed for one minute in a current of 16.08 mA. Considering 100% efficiency, the pH of the resulting solution will be
(a) 7
(b) 9
(c) 8
(d) 10
Answer::::(c)
