MCQs on Electrical Conductors, Arrhenius Theory and Ostwald’s Dilution Law

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?

1. 100%
2. 200%
3. 300%
4. 400%

Answer:(b)

2. What happens to the conductivity of semiconductors when there is an increase in temperature?

1. decrease
2. increase
3. first, increase and then decrease
4. remains constant

Answer:(b)

3. Semiconductors have electrical conductivity

1. more than metals but less than insulators
2. less than thermistor but more than an insulator
3. equal to the thermistor
4. less than metals but more than typical insulators

Answer:(d)

4. When temperature increases the conductance of conductors is

1. decrease
2. increase
3. first, increase and then decrease
4. remains constant

Answer:(a)

5. When acids dissolve in water it releases

1. H⁺ ion
2. H^– ion
3. H₃O⁺ ion
4. H₃O₂⁺ ion

Answer:(a)

6. Which element is always present in Arrhenius acid

1. oxygen
2. nitrogen
3. hydrogen
4. none of the above

Answer:(c)

7. Ostwald’s dilution law is applicable to

1. strong electrolytes only
2. weak electrolytes only
3. non-electrolytes
4. strong as well as weak electrolytes

Answer:(b)

8. In the titration of iodine against hype the indicator used is

1. starch
2. potassium ferricyanide
3. methyl orange
4. methyl red

Answer:(a)

9. According to Ostwald’s dilution law:

Answer:(b)

10. 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

1. 7
2. 9
3. 8
4. 10

Answer:(c)