Selenium becomes a conductor in light so it behaves like____________?

Related Mcqs:

1. 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

2. An uncharged conductor is placed near a charged conductor, then_____________?

   A. the uncharged conductor gets charged by conduction
   B. the uncharged conductor gets charged by induction and then attracted towards the charging body
   C. the uncharged conductor is attracted first and then charged by induction
   D. it remains as such

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. If metallic conductor is charged negatively then its weight______________?

   A. Remains same
   B. First increases then decreases
   C. Decreases then increases
   D. Increases for a while

5. The resistivity of the conductor depends on

   A. area of the conductor.
   B. length of the conductor.
   C. type of material.
   D. none of these.

6. The electric field at a point situated at a distance d from straight charged conductor is____________?

   A. proportional to d
   B. inversely proportional to d
   C. inversely proportional to d
   D. none of the above

7. A single core cable used on 33000 V has conductor diameter 10 mm and the internal diameter of sheath 25 mm. The maximum electrostatic stress in the cable is____________?

   A. 62 x 105 V/m
   B. 72 x 105 V/m
   C. 82 x 105 V/m
   D. 92 x 105 V/m

8. The presence of an uncharged conductor near a charged one increases the__________?

   A. charge of the charged conductor
   B. capacity of the charged conductor
   C. potential of the charged conductor
   D. all of the above

9. Which of the following works on torque on the current carrying conductor placed in magnetic field ?

   A. galvanometer
   B. ammeter
   C. voltmeter
   D. all of the above

10. The emf induced in a conductor of unit length moving with unit velocity at right angles to a magnetic field is equal to_____________?

    A. Magnetic flux density
    B. Torque
    C. Mutual induction
    D. Motional emf