Current Electricity, Thermal & Chemical Effect of Current Test Online MCQs

1. A battery of e.m.f. 20 V and internal resistance 6Ω is connected to a resistor as shown in figure. If the current in the circuit is 1 amp, the resistance of the resistor will be:

2. Two identical galvanometers are taken, one is to be converted into an ammeter and other into a milliammeter. Shunt of milliammeter compared to ammeter is

3. A electric bulb marked 40 W and 200V, is used in a circuit of supply voltage 100V. Now its power is:

4. A wire of radius r has resistance R. If it is stretched to a radius r/2, its resistance will be:

5. The cell has an emf of 2V and the internal resistance of this cell is 0.1 Ω, it is connected a resistance of 3.9 Ω. The voltage across the cell will be:

6. In the figure shown, the capacity of the condenser C is 2μF. The current in 2Ω resistance is

7. In the given figure, the equivalent resistance between two points A and B will be:

8. The internal resistance of a cell is the resistance of: 

9. The resistance between points A and B is

10. Two filaments of same length are connected first in series then in parallel. For the same amount of main current flowing, the ratio of the heat produced is:

11. What is the equivalent resistance across A and B in the figure shown, if R = 3Ω?

12. For ensuring dissipation of same energy in all three resistors (R₁, R₂, R₃) connected as shown in figure, their values must be related as:

13. Electroplating is not provided to be used for

14. The resistance of a galvanometer is 50 Ω and current required to give full scale deflection is 100 μA in order to convert it into an ammeter for reading up to 10A. It is necessary to put an resistance of

15. Same length of two identical wires are first connected is series and then in parallel, then the amount of heat produced in both the conditions are in the ratio: