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

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b15 sec

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c1.5x105sec

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d0.9x102sec

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View Answer 0.9sec

Electromagnetic waves emitted from antenna are________________?


aStationary

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bLongitudinal

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cTransverse

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dAll the above

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View Answer Transverse

Electromagnetic waves transport___________________?


aEnergy

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bMomentum

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cMass

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dHeat

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View Answer Energy

The direction of propagation of an electromagnetic waves is________________?


aPerpendicular to electric field

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bPerpendicular to both electric and magnetic field

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cPerpendicular to magnetic field

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dParallel to electric and magnetic field

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A changing magnetic flux produces around itself an induced_______________?


aMagnetic field

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bElectric field

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c Electromagnetic force

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dArtificial gravitational field

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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

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b20.66A

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c 6.66A

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d5.66A

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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

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b Sinusoidal current

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cr.m.s current

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dNet current

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View Answer r.m.s current

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


aTwice

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bOne half

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cFour times

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dNone

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View Answer One half

Waves emitted from the antenna are__________________?


aSound waves

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bElectromagnetic waves

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cRadio waves

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dModulated waves

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View Answer Electromagnetic waves

An electromagnetic wave consists of _____________________?


aElectric and magnetic fields moving parallel to each other

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bMagnetic field moving with velocity of light in space

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c Electric field moving with velocity of light

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dElectric and magnetic fields moving perpendicular to each other

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