When electric current passes through a metallic conductor, its temperature rises. This is due to__________?

Related Mcqs:

1. Two copper conductors have equal length. The cross-sectional area of one conductor is four times that of the other. If the conductor having smaller cross-sectional area has a resistance of 40 ohms the resistance of other conductor will be_____________?

   A. 160 ohms B. 80 ohms C. 20 ohms D. 10 ohms...

2. The property of a conductor due to which it passes current is called___________?

   A. resistance B. reluctance C. conductance D. inductance...

3. The resistance of a conductor of diameter d and length l is R Ω. If the diameter of the conductor is halved and its length is doubled, the resistance will be

   A. R Ω B. 2R Ω C. 4R Ω D. 8R Ω...

4. When electric current passes through a bucket full of water, lot of bubbling is observeD. This suggests that the type of supply is____________?

   A. A. C. B. D. C. C. any of above two D. none of the above...

5. Current velocity through a copper conductor is___________?

   A. the same as propagation velocity of electric energy B. independent of current strength C. of the order of a few ^.s/m D. nearly 3 x 108 m/s...

6. The insulation on a current carrying conductor is provided__________?

   A. to prevent leakage of current B. to prevent shock C. both of above factors D. none of above factors...

7. If a wire conductor of 0.2 ohm resistance is doubled in length, its resistance becomes______________?

   A. 0.4 ohm B. 0.6 ohm C. 0.8 ohm D. 1.0 ohm...

8. An instrument which detects electric current is known as_____________?

   A. voltmeter B. rheostat C. wattmeter D. galvanometer...

9. Electric current passing through the circuit produces_____________?

   A. magnetic effect B. luminous effect C. thermal effect D. chemical effect E. all above effects...

10. Ohm’s law is not applicable to__________?

    A. semi-conductors B. D. C. circuits C. small resistors D. high currents...