Current Electricity Class 12 MCQs Questions with Answers

1. Drift velocity of electrons is due to

2. Nichrome or Manganin is widely used in wire bound standard resistors because of their

3. The current which is assumed to be flowing in a circuit from positive terminal to negative, is called

4.  
In the series combination of two or more than two resistances

5. Two conductors of equal length and radii the ratio of 2 : 3 are; connected in parallel the source of electricity. The ratio of the velocity of electrons in the conductor be :

6. The example of a non-ohmic resistance is:

7. In India electricity is supplied fordomestic use at 220 V. It is supplied at 110 V in U.S.A. If the resistance of a 60 W bulb use in India is R. the resistance of a 60 W bulb for use in USA will be:

8. Constantan wire is used for making standard resistance, because it has

9. When no current is passed through a conductor,

10. A charge is moving across a junction, then

11. To draw a maximum current from a combination of cells, how should the cells be grouped?

12. Combine three resistors 5 Q, 4.5 Q and 3 Q in such a way that the total resistance of this combination is maximum

13. When a metal conductor connected to left gap of a meter bridge is heated, the balancing point

14. In parallel combination of n cells, we obtain

15. The heat sensitive device whose resistivity changes very rapidly with change of temperature is called a :

16. Siemen is the unit of:

17. A galvanometer acting as a volt meter will have with its coil.

18. Thermo electricity was discovered by:

19. A current passes through a resistor. If K1 and K2 represent the average kinetic energy of the conduction electrons and the metal ions respectively then

20. Two cells of emf’s approximately 5 V and 10 V are to be accurately compared using a potentiometer of length 400 cm.