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General Knowledge :: Physics

  1. Water cannot be used to extinguish fire caused by electric current, because

  2. A.

     It may cause electrocution

    B.

     It may cause hydrolysis

    C.

     It may cause electrolysis

    D.

     It may spoil the wiring


  3. Brightness of bulb depends on voltage or current?

  4. A.

     Current

    B.

     Voltage

    C.

     Both A & B

    D.

     None


  5. The resistance of a conductor is inversely proportional to its:

  6. A.

     Length

    B.

     Resistivity

    C.

     Temperature

    D.

     Area of cross section


  7. Which one of the following is an ohmic conductor?

  8. A.

     Germanium

    B.

     Silicon

    C.

     Carbon

    D.

     Silver


  9. What is the effective resistance (in Ω) of two resistors 20 Ω and 30 Ω connected in parallel?

  10. A.

     50

    B.

     12

    C.

     24

    D.

     36


  11. Which elements are malleable and good conductors of electricity?

  12. A.

     Tin and silver

    B.

     Iodine and silver

    C.

     Tin and xenon

    D.

     Iodine and xenon


  13. What is the resistance (in ohm) of an electrical component if a current of 0.1 A passes through it on application of 5 V of potential difference across it?

  14. A.

     0.5

    B.

     100

    C.

     50

    D.

     1


  15. If electric resistance is to be decreased, then the number of resistances should be connected in ________

  16. A.

     Series

    B.

     Parallel

    C.

     Mixed arrangement

    D.

     None of these


  17. Ampere second could be the unit of

  18. A.

     Power

    B.

     Energy

    C.

     Conductance

    D.

     Charge


  19. Which one of the following is a good electrical conductor?

  20. A.

     Graphite

    B.

     Diamond

    C.

     Peat

    D.

     Charcoal