Physics MCQs

Page No. 47

When a pure inductor of inductance L and a pure capacitor of capacitance C are connected in parallel to a sinusoidal potential difference V the potential difference across both L & C will be_______________?


aSame


bDifferent


cAt L will be more than at C


dAt L will be less than at C


View Answer Same

Ammeter connected in an AC circuit measures______________?


aThe exact value of the current


bRMS value of the current


cThe net value of the current


dThe peak value of the current



A wire of resistance R is coiled inductively so that its inductance is L. The impedance of the coil at a frequency of f is_______________?


a (R+2πfL)


bR+1/2πfL


c(R2+f2L2)


d (R2+4π2f2L2)


View Answer (R2+4π2f2L2)

If a glass plate is inserted in between the plate of a capacitor in series with a lighted bulb the brightness of the bulb________________?


aRemains same


bBrightness increases


cBrightness decreases


dNo light


View Answer Brightness increases

A 100µF capacitor with a 12V source in series having frequency 50Hz will offer a capacitive reactance of about______________?


a32Ω


b 62Ω


c50Ω


d100Ω


View Answer 32Ω

In the capacitive circuit the current___________________?


aLags behind voltage by π/2


bIs in phase with voltage


cOpposite in phase of voltage by π


dLeads forward the voltage by π/2



When A.C current passes through a capacitor then the current relationship will be_______________?


aThe current lead voltage by phase angle is 90 degrees


bThe voltage leads current by phase angle is 90 degrees


cThe current lead voltage by phase angle is 45 degrees


d The voltage leads current by phase angle is 45 degrees



pure resistor circuit the voltage and current are_______________?


aLagging each other


bThey are at 90? phase difference


cThey have zero phase difference


dNo phase difference



An alternating current is represented by the equation I = I∫sinπt which of the following equation represents an alternating current of frequency and amplitude twice that of the above current ?


aI = 2I∫Sin(πt/2)


bI = 2I∫Sin(2πt)


cI = 2ISinπt


dI = I∫sin(2πt)


View Answer I = 2I∫Sin(2πt)

To find the r.m.s value of an alternating current mathematically we need to have ________________?


aMean value of I2


bSquare root of mean value of I2


cSquare root of I2


dSquare of 1/2



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