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Electricity Tes...

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  • Question 1
    1 / -0

    A rod has a resistivity of 2 × 10−3 Ωm . If its length is doubled and the area is halved, what will be the new resistivity?

  • Question 2
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    Statement A : Resistivity increases with decrease in temperature in insulators.

    Statement B : Resistivity of a conductor increases with increasing temperature.

  • Question 3
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    Nichrome and copper wires of the same length and the same radius are connected in series. Current 'I' is passed through them. Which of the two gets heated first?

  • Question 4
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    A heater joined in parallel with a 60 W bulb is connected to the mains. If the 60 W bulb is replaced by a 100 W bulb, the rate of heat produced by the heater will be:

  • Question 5
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    Match the following with the correct response:

     (1) Bulb filament  (A) Nichrome
     (2) Heating element of an electric iron  (B) Potential difference
     (3) Super conductors  (C) Zero resistivity
     (4) EMF  (D) Tungsten

  • Question 6
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    Match the following with the correct response:

     (1) Best conductor  (A) Silicon
     (2) Standard resistor  (B) Silver
     (3) Semi- conductor  (C) Ebonite
     (4) Insulator  (D) Constantan

  • Question 7
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    Match the following with the correct response:

     (1) Electric current  (A) Ampere
     (2) Resistance  (B) Volt
     (3) Potential difference  (C) Ohm
     (4) Resistivity  (D) Ohm-m

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