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Electric Circuits

Electric Circuits
In given figure, the value of resistance R in Ω is

 4.5 Ω
 1 Ω
 2.5 Ω
 3.5 Ω

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Electric Circuits
A series RLC circuit is connected across a 240V, 50 Hz supply. When the voltage across capacitor is 250V, a maximum current of 0.5A flows in the circuit. Find the resistance.

 100 Ohms.
 480 Ohms.
 500 Ohms.
 1000 Ohms.

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Electric Circuits
Fall time is the time required for a pulse to decrease from 90 to ________% if its maximum values

 10
 5
 15
 20

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Electric Circuits
A voltage source having an open circuit voltage of 100 V and internal resistance of 50 Ω is equivalent to a current source

 2 A with 50 Ω in parallel.
 0.5 A in parallel with 50 Ω.
 2 A with 50 Ω in series.
 none of these.

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Electric Circuits
When water is added to sulphuric acid

  colour of acid changes.
  water start boiling.
  lot of heat is generated.
  acid particles get separated.

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Electric Circuits
If emf in a given circuit is given by e = 100 sinω0t, then maximum value of voltage and frequency will be

 50√2 V, 100 Hz.
 100√2 V, 100 Hz.
 100 V, 50 Hz.
 100 V, 100 Hz.

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