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EEE :: Current Electricity

  1. Which method can be used for absolute measurement of resistances?

  2. A.

     Lorentz method

    B.

     Raleigh method

    C.

     Ohm's law method

    D.

     Wheatstone bridge method


  3. A field of force can exist only between

  4. A.

     Two molecules

    B.

     Two ions

    C.

     Two atoms

    D.

     Two metal particles


  5. Conductance is reciprocal of

  6. A.

     Resistance

    B.

     Inductance

    C.

     Reluctance

    D.

     Capacitance


  7. In an electric kettle water boils in 10 m minutes. It is required to boil the boiler in 15 minutes, using same supply mains

  8. A.

     Length of heating element should be decreased

    B.

     Length of heating element should be increased

    C.

     Length of heating element has no effect on heating if water

    D.

     None of the above


  9. A current of 16 amperes divides between two branches in parallel of resistances 8 ohms and 12 ohms respectively. The current in each branch is

  10. A.

     6.4 A, 6.9 A

    B.

     6.4 A, 9.6 A

    C.

     4.6 A, 6.9 A

    D.

     4.6 A, 9.6 A


  11. Three identical resistors are first connected in parallel and then in series. The resultant resistance of the first combination to the second will be

  12. A.

     9 times

    B.

     1/9 times

    C.

     1/3 times

    D.

     3 times


  13. When current flows through heater coil it glows but supply wiring does not glow because

  14. A.

     Current through supply line flows at slower speed

    B.

     Supply wiring is covered with insulation layer

    C.

     Resistance of heater coil is more than the supply wires

    D.

     Supply wires are made of superior material


  15. Which of the following quantities remain the same in all parts of a series circuit?

  16. A.

     Voltage

    B.

     Current

    C.

     Power

    D.

     Resistance


  17. A light bulb draws 300 mA when the voltage across it is 240 V. The resistance of the light bulb is

  18. A.

     400 Q

    B.

     600 Q

    C.

     800 Q

    D.

     1000 Q


  19. International ohm is defined in terms of the resistance of

  20. A.

     A column of mercury

    B.

     A cube of carbon

    C.

     A cube of copper

    D.

     The unit length of wire