The resistivity of the conductor depends on

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 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

3. An electric current induced within the body of a conductor when that conductor either moves through a non uniform magnetic field or in a region where there is a change in magnetic flux is called_____________?

   A. Induced current
   B. Eddy current
   C. Back emf
   D. None of the above

4. The thickness of insulation provided on the conductor depends on_____________?

   A. the magnitude of voltage on the conductor
   B. the magnitude of current flowing through it
   C. both A. and (b)
   D. none of the above

5. The unit of resistivity is

   A. Ω.
   B. Ω – metre.
   C. Ω / metre.
   D. Ω / m².

6. The resistivity of a pure silicon is about _______________?

   A. 100 O cm
   B. 6000 O cm
   C. 3 x 105 O m
   D. 6 x 10-8 O cm

7. The resistivity of pure germanium under standard conditions is about_______________?

   A. 6 x 104 cm
   B. 60 x cm
   C. 3 x 106 cm
   D. 6 x 10-4 cm

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

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

9. 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

10. Which is the best conductor of electricity _______________?

    A. Iron
    B. Silver
    C. Copper
    D. Carbon