Chemical Effects of Electric Current and Its Applications Test Online MCQs

1. The potential difference across a conductor is doubled, the rate of generation of heat will:

2. Two similar head lights lamps are connected in parallel to each other. Together, they consume 48 W from a 6 V battery. What is the resistance of each filament?

3. A motor starter is a:

4. Mass of the ions liberated during electrolysis by 1 A current in one second is called:

5. If 1 A of current is passed through CuSO₄ solution for 10 seconds, then the number of copper ions deposited at the cathode will be about:

6. A constant potential difference is applied across the ends of a wire. Which one of the following operations will reduce the rate of heat generation to half?

7. Same current is being passed through a copper voltameter and a silver voltameter. The rate of increase in weights of the cathodes in the two voltameters will be proportional to:

8. If the current in a conductor is doubled, the rate of rise of temperature in the conductor will be assuming that there is no loss of heat from the conductor

9. How much electric charge should pass through acidulated water to release 22.4 litre of hydrogen gas at NTP?

10. What determines the emf between the two metals placed in an electrolyte?

11. Resistance of conductor is doubled keeping the potential difference across it constant. The rate of generation of heat will:

12. What is converted into heat when current is set up through a conductor?

13. How many lamps each of 50 W from a 100 V can be connected in parallel across a 120 V battery of internal resistance 10Ω, so that each glows to full power?

14. Voltameter cannot be used to measure:

15. When a 40 watt lamp is connected in series  with a 100 watt lamp across a 220 V supply, which one glows brighter?

16. Silver and zinc voltameter are connected in series and same current s passed through both of them for same time. If x kg of silver is liberate than the amount of zinc liberated will be very near to:

17. What carries current in an electrolyte?

18. A lamp is marked 60 W, 220 V. If it operates at 200 V, the rate of consumption of energy will:

19. The resistance of a wire is 10Ω. It is stretched so as to reduce its diameter to half. The resistance f the wire will now be:

20. What are the essential requirements for the heater filament?