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EEE :: Current Electricity

  1. Four wires of same material, the same cross-sectional area and the same length when connected in parallel give a resistance of 0.25 Q. If the same four wires are connected is series the effective resistance will be

  2. A.

     1 Q

    B.

     2 Q

    C.

     3 Q

    D.

     4 Q

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  3. When one leg of parallel circuit is opened out the total current will

  4. A.

     Reduce

    B.

     Increase

    C.

     Decrease

    D.

     Become zero

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  5. Two resistors are said to be connected in series when

  6. A.

     Same current passes in turn through both

    B.

     Both carry the same value of current

    C.

     Total current equals the sum of branch currents

    D.

     Sum of IR drops equals the applied e.m.f.

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  7. Resistance of a tungsten lamp as applied voltage increases

  8. A.

     Decreases

    B.

     Increases

    C.

     Remains same

    D.

     None of the above

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  9. Three 6 ohm resistors are connected to form a triangle. What is the resistance between any two corners?

  10. A.

     3/2 Q

    B.

     6 Q

    C.

     4 Q

    D.

     8/3 Q

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  11. 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

  12. A.

     160 ohms

    B.

     80 ohms

    C.

     20 ohms

    D.

     10 ohms

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  13. The condition for the validity under Ohm’s law is that

  14. A.

     resistance must be uniform

    B.

     current should be proportional to the size of the resistance

    C.

     resistance must be wire wound type

    D.

     temperature at positive end should be more than the temperature at negative end

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  15. The condition for the validity under Ohm's law is that

  16. A.

     Resistance must be uniform

    B.

     Current should be proportional to the size of the resistance

    C.

     Resistance must be wire wound type

    D.

     Temperature at positive end should be more than the temperature at negative end

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  17. Which of the following can have negative temperature coefficient?

  18. A.

     Compounds of silver

    B.

     Liquid metals

    C.

     Metallic alloys

    D.

     Electrolytes

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  19. Which one of the following does not have negative temperature coefficient?

  20. A.

     Aluminium

    B.

     Paper

    C.

     Rubber

    D.

     Mica

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