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Which of the following acts as a circuit protection device ? 

 

  • Option 1)

    conductor 

  • Option 2)

    inductor 

  • Option 3)

    switch 

  • Option 4)

    fuse 

fuse Option 1)conductor Option 2)inductor Option 3)switch Option 4)fuse 

In the circuit shown below , the readings of the voltmeter and the ammenter will be : 

 

  • Option 1)

    V_2 > V_1 \: \: and \: \: i _ 1 = i _ 2

  • Option 2)

    V_2 =V_1 \: \: and \: \: i _ 1 > i _ 2

  • Option 3)

    V_2 =V_1 \: \: and \: \: i _ 1 = i _ 2

  • Option 4)

    V_2 > V_1 \: \: and \: \: i _ 1 > i _ 2

CIrcuit 1  circuit 2  The resistance of voltmeter is very high . so negligible amount of current flow through voltmeter . soo we can consider  almost all currents flows through upper 10  Option 1)Option 2)Option 3)Option 4)

Six similar bulbs are connected as shown in the figure with a DC source of emf E , and zero internal resistance . 

The ratio of power consumption by the bulbs when 1) all are glowing and 2 ) in the situation when two from section A and one from section B are glowing will be : 

 

  • Option 1)

    4: 9 

  • Option 2)

    9 : 4 

  • Option 3)

    1 : 2 

  • Option 4)

    2 : 1 

Option 1)4: 9 Option 2)9 : 4 Option 3)1 : 2 Option 4)2 : 1 
Medical
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Current sensitivity of a moving coil galvanometer is 5 div/mA and its voltage sensitivity (angular deflection per unit voltage applied) is 20 div/V. The resistance of the galvanometer is
 

 

  • Option 1)

    250 \Omega

  • Option 2)

    25 \Omega

  • Option 3)

    40 \Omega

  • Option 4)

    500 \Omega

 
As we have learned @9775 Current sensitivity  voltage sensitivity    Option 1) 250 Option 2) 25 Option 3) 40 Option 4) 500
Medical
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The potential difference (VA - VB) between the points A and B in the given figure is

  • Option 1)

    -3 V

  • Option 2)

    +3 V

  • Option 3)

    +6 V

  • Option 4)

    +9 V

 
As we discussed in Potential difference - The voltage accross the terminals of a cell when it is supplying current to external resistance is known as Potential Difference . - wherein     = 2x2+3+1x2=9V Option 1) -3 V This option is incorrect. Option 2) +3 V This option is incorrect. Option 3) +6 V This option is incorrect. Option 4) +9 V This option is correct.
Medical
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A filament bulb (500 W, 100 V) is to be used in a 230 V main supply. When a resistance R is connected in series, it works perfectly and the bulb consumes 500 W. The value of R

  • Option 1)

    230 \Omega

  • Option 2)

    46 \Omega

  • Option 3)

    26 \Omega

  • Option 4)

    13 \Omega

 
As discussed in if R=r - - wherein Power delivered will be maximum     Option 1) 230  This option is incorrect. Option 2) 46  This option is incorrect. Option 3) 26  This option is correct. Option 4) 13  This option is incorrect.
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