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Current Electricity Test - 149
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Current Electricity Test - 149

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  • Question 1/10
    4 / -1
    If current in an electric bulb changes by 1%, then the power will change by
    Solutions

  • Question 2/10
    4 / -1
    Two identical batteries, each of e.m.f. 2 volt and internal resistance 1.0 ohm are available to produce heat in an external resistance R = 0.5 ohm by passing a current through it. The maximum Joulean power that can be developed across R using these batteries is
    Solutions

  • Question 3/10
    4 / -1
    A constant voltage is applied between the two ends of a metallic wire. If both the length and the radius of the wire are doubled, the rate of heat developed in the wire
    Solutions

  • Question 4/10
    4 / -1
    The heating coils rated at 220 volt and producing 50 cal/sec heat are available with the resistances 55Ω, 110Ω, 220Ω and 440Ω. The heater of maximum power will be of
    Solutions

  • Question 5/10
    4 / -1
    The resistance of hot tungsten filament is about 10 times the cold resistance. What will be the resistance of 100 W and 200 V lamp when not in use
    Solutions

  • Question 6/10
    4 / -1
    A heater coil is cut into two equal parts and only one part is now used in the heater. The heat generated will now be
    Solutions

  • Question 7/10
    4 / -1
    An electric heater kept in vacuum is heated continuously by passing electric current. Its temperature
  • Question 8/10
    4 / -1
    Heat produced in a wire of resistance R due to current flowing at constant potential difference is proportional to
    Solutions

  • Question 9/10
    4 / -1
    A coil takes 15 min to boil a certain amount of water, another coil takes 20 min for the same process. Time taken to boil the same amount of water when both coils are connected in series
    Solutions

  • Question 10/10
    4 / -1
    An electric bulb of 100 watt is connected to a supply of electricity of 220 V . Resistance of the filament is
    Solutions

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