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Current Electricity Test - 24

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Current Electricity Test - 24
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  • Question 1
    1 / -0
    A resistor with the color coded value of 1000 ohms and 10% tolerance can have an actual resistance between
    Solution
    color coding gives a range in which value of resister lies.

    Actual resistance R=1000±10R=1000\pm 10%
    R=1000±1000×10100R=1000±100 R=1000\pm 1000\times \frac { 10 }{ 100 } \\ R=1000\pm 100
    Value of R is between 900 to 1100ohms.

  • Question 2
    1 / -0
    The resistivity of a wire depends on its
    Solution
    The resistivity or specific resistance of a material is an intensive property (property which does not depend on the system size or the amount of material in the system) and depend only on material and temperature.
  • Question 3
    1 / -0
    Unit of e.m.f. of a cell is 
    Solution
    Emf is voltage generated by the battery and hence , the unit of emf is same as that of voltage,which is volts.
  • Question 4
    1 / -0
    On which one of the following the emf of a cell does not depend : 
    Solution
    Emf generated does not depends on the size of plates.
  • Question 5
    1 / -0
    What is the power produced by an appliance marked " 240V240 V, 2A"?2 A"?
    Solution
    Relation between power(P)(P), voltage(v)(v) and current(I)(I)-
    P =VI P = VI
    Given,
    V=240 VV = 240\ V
    I=2 AI = 2\ A
    P=240×2\Rightarrow P = 240 \times 2
    P=480 W\Rightarrow P = 480\ W
  • Question 6
    1 / -0
    The color coding of  earth, live and neutral wire respectively is
    Solution
    The electric power line enters our house through three wires- namely the live wire, the neutral wire and the earth wire. To avoid confusion we follow a colour code for insulating these wires. The red wire is the live wire, and the black wire is neutral. The earth wire is given green plastic insulation.
    The colour coding of wires is green for earth red for live and black for neutral.
  • Question 7
    1 / -0
    In comparing e.m.f. of two cells with the help of a potentiometer, at the balance point, the current flowing through the wire is taken from
    Solution
    In a potentiometer , at the balance point there is no current flowing through the path containing the cell, there is current only in the primary circuit, which is driven by the battery in the main circuit.Hence correct option is C
  • Question 8
    1 / -0
    The resistance of a metallic conductor :
    Solution
    Resistance of a metallic conductors increases with increase (or rise) in temperature. because the temperature coefficient of conductors is positive in nature hence resistance is directly proportional to temperature.
  • Question 9
    1 / -0
    With rise in the temperature, resistance of carbon
    Solution
    Carbon is a insulator and the temperature coefficient for the insulators is negative. so because Temperature coefficient  of resistivity of carbon is negative .Therefore its resistance decreases with increase in temperature.
  • Question 10
    1 / -0
    When temperature of a conductor increases, its resistance
    Solution
    As we know,
    R=ρLA R=\rho \dfrac { L }{ A } 
    Resistance depends on resistivity of the material and as we increase the temperature resistivity also increases.
    ρ\rho is inversely proportional to the relaxation time of electrons .
    As we increase the temperature the frequency of collision increases decreasing the relaxation time.
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