Current Electricity Class 12 MCQs Questions with Answers

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

2. Thermo electricity was discovered by:

3. 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 :

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

5. In parallel combination of n cells, we obtain

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

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

8. A charge is moving across a junction, then

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

10.  
In the series combination of two or more than two resistances

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

12. 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:

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

14. Siemen is the unit of:

15. When no current is passed through a conductor,

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

17. Drift velocity of electrons is due to

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

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