Physics MCQs

Page No. 48

A capacitor of capacitance 30µF is charged by a constant current of 10mA. If initially, the capacitor was uncharged what is the time taken for the potential difference across the capacitor to reach 300V ?


a0.9sec


b15 sec


c1.5x105sec


d0.9x102sec


View Answer 0.9sec

Electromagnetic waves emitted from antenna are________________?


aStationary


bLongitudinal


cTransverse


dAll the above


View Answer Transverse

Electromagnetic waves transport___________________?


aEnergy


bMomentum


cMass


dHeat


View Answer Energy

The direction of propagation of an electromagnetic waves is________________?


aPerpendicular to electric field


bPerpendicular to both electric and magnetic field


cPerpendicular to magnetic field


dParallel to electric and magnetic field



A changing magnetic flux produces around itself an induced_______________?


aMagnetic field


bElectric field


c Electromagnetic force


dArtificial gravitational field



An alternating current of the r.m.s value of 4.0 A and frequency 50Hz flows in a circuit containing a 10Ω resistor. The peak current is then ?


a20A


b20.66A


c 6.66A


d5.66A


View Answer 5.66A

The value of the steady current which when flowing through the same resistor produces heat at the same rate as the mean rate of heat produced by the alternating current is__________________?


aAverage current


b Sinusoidal current


cr.m.s current


dNet current


View Answer r.m.s current

If capacitance of L-C circuit is made four times then frequency of the circuit becomes___________________?


aTwice


bOne half


cFour times


dNone


View Answer One half

Waves emitted from the antenna are__________________?


aSound waves


bElectromagnetic waves


cRadio waves


dModulated waves


View Answer Electromagnetic waves

An electromagnetic wave consists of _____________________?


aElectric and magnetic fields moving parallel to each other


bMagnetic field moving with velocity of light in space


c Electric field moving with velocity of light


dElectric and magnetic fields moving perpendicular to each other



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