Science

7th

grade

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ELECTRIC CURRENT AND IT'S EFFECT

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  • 1. Multiple Choice
    45 seconds
    1 pt

    Q1. If in a circuit diagram containing a cell and nichrome wire tied between two nails, the cell is replaced by a battery then what will happen to the nichrome wire?

    A)It gets red hot slowly.

    B)No change in the temperature take place.

    C)It will get red hot quickly.

    D)The wire will break due to increase in strength of current.

  • 2. Multiple Choice
    45 seconds
    1 pt

    Q2. Why Nichrome is used for making wires of heating coils?

    1.High melting point and low resistivity.

    2.Low resistivity and high melting point.

    3.High resistivity and high melting point.

    4. It can get oxidised easily and have high melting point

  • 3. Multiple Choice
    45 seconds
    1 pt

    Q3. Which among the following are the advantages of heating effect of current?

    1.Can be used in electric fuse

    2.Increases the life of several appliances in the circuit.

    3.It helps in preventing loss of energy.

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