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Current Electricity - section-1
  1. Resistance of a material always decreases if

    2. A.

     Temperature of material is decreased
    B.

     Temperature of material is increased
    C.

     Number of free electrons available becomes more
    D.

     None of the above is correct

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  2. The rating of a fuse wire is always expressed in

    3. A.

     Ampere-hours
    B.

     Ampere-volts
    C.

     kWh
    D.

     Amperes

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  3. The minimum charge on an ion is

    4. A.

     Equal to the atomic number of the atom
    B.

     Equal to the charge of an electron
    C.

     Equal to the charge of the number of electrons in an atom (#) zero
    D.

     None of these

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  4. Current velocity through a copper conductor is

    5. 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

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  5. For which of the following 'ampere second' could be the unit?

    6. A.

     Reluctance
    B.

     Charge
    C.

     Power
    D.

     Energy

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  6. An instrument which detects electric current is known as

    7. A.

     Voltmeter
    B.

     Rheostat
    C.

     Watt-meter
    D.

     Galvanometer

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  7. It becomes more difficult to remove

    8. A.

     Any electron from the orbit
    B.

     First electron from the orbit
    C.

     Second electron from the orbit
    D.

     Third electron from the orbit

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  8. Two resistances Rl and Ri are connected in series across the voltage source where Rl > Ri. The largest drop will be across

    9. A.

     Rl
    B.

     Ri
    C.

     Either Rl or Ri
    D.

     None of them

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  9. A closed switch has a resistance of

    10. A.

     Zero
    B.

     About 50 ohms
    C.

     About 500 ohms
    D.

     Infinity

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  10. A 40 W bulb is connected in series with a room heater. If now 40 W bulb is replaced by 100 W bulb, the heater output will:

    11. A.

     Decrease
    B.

     Increase
    C.

     Remain same
    D.

     Heater will burn out

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