# 600+ Electromagnetics Solved MCQs

56
56.5k
501.

A. 180
B. 90
C. 45
D. 120
502.

A. 9.11
B. 1.99
C. 1.19
D. 9.91
503.

A. 1.6
B. 1.11
C. 1.25
D. 0.8
504.

A. 60π
B. 12π
C.
D. 120π
505.

## The skin effect is a phenomenon observed in

A. insulators
B. dielectrics
C. conductors
D. semiconductors
506.

A. meter
B. millimetre
C. centimetre
D. micrometer
507.

A. 0.5
B. 0.25
C. 2
D. 4
508.

## The relation between the skin depth and frequency is given by

A. skin depth α f
B. skin depth α 1/f
C. skin depth α √f
D. skin depth α 1/√f
Answer» D. skin depth α 1/√f
509.

A. 2
B. 3
C. 4
D. 6
510.

## The coaxial cable consists of

A. conductors
B. dielectric
C. conductor with dielectric
D. two conductors with dielectric
Answer» D. two conductors with dielectric
511.

## The transmission line is said to be lossless when the

A. conductor is perfect and dielectric is lossless
B. conductor is perfect and dielectric is lossy
C. conductor is imperfect and dielectric is lossy
D. conductor is imperfect and dielectric is lossless
Answer» A. conductor is perfect and dielectric is lossless
512.

A. 0
B. 1
C. -1
D. infinity
513.

A. ohm
B. neper
C. decibel
514.

A. r/l = g/c
B. rl = gc
C. l/r = c/g
D. rg/lc
515.

## Given that R = 20 ohm, L = 40 mH, C = 40 μF, G = 0.02 mho. Find whether the line is distortionless or not.

A. distorted line
B. distortionless line
C. all of the mentioned
D. none of the mentioned
516.

A. 16
B. 4
C. 2
D. 32
517.

A. r vs z
B. r vs znorm
C. t vs z
D. t vs znorm
518.

## The Smith chart consists of the

A. constant r and variable x circles
B. variable r and constant x circles
C. constant r and constant x circles
D. variable r and variable x circles
Answer» C. constant r and constant x circles
519.

A. (0,1)
B. (0,-1)
C. (-1,0)
D. (1,0)
520.

## Moving towards the clockwise direction in the Smith chart implies moving

A. towards generator
C. towards stub
D. towards waveguide
521.

A. (0.54,0)
B. (0.45,0)
C. (0.36,0)
D. (0.78,0)
522.

A. 30
B. 150
C. 5/3
D. 3/5
523.

A. 1
B. 0.2
C. 0.5
D. 0.25
524.

A. 0
B. 1
C. -1
D.
525.

## For time varying currents, the field or waves will be

A. electrostatic
B. magneto static
C. electromagnetic
D. electrical
526.

## According to Faraday’s law, EMF stands for

A. electromagnetic field
B. electromagnetic force
C. electromagnetic friction
D. electromotive force
527.

A. 3
B. 6
C. 12
D. 27
528.

A. 1 n
B. 1.2 n
C. 1.4 n
D. 1.6 n
529.

A. zero
B. minimum
C. maximum
D. unity
530.

A. e
B. d
C. h
D. b
531.

A. 10
B. 9
C. 24
D. 0
532.

## Find the Maxwell equation derived from Faraday’s law.

A. div(h) = j
B. div(d) = i
C. curl(e) = -db/dt
D. curl(b) = -dh/dt
533.

A. div(i) = h
B. div(h) = j
C. curl(h) = j
D. curl(b) = d
534.

A. static
B. differential
C. integral
D. harmonic
535.

## The charge build up in the capacitor is due to which quantity?

A. conduction current
B. displacement current
C. convection current
D. direct current
536.

## In metals which of the following equation will hold good?

A. curl(h) = j
B. curl(j) = dd/dt
C. curl(h) = d
D. curl(j) = db/dt
537.

A. 9.6
B. 12/80
C. 80/12
D. 12/0.8
538.

A. 1/16
B. 16t
C. 16
D. 162
539.

A. 25
B. 400
C. 0.04
D. 1600
540.

A. 10sin 0.5t
B. 10cos 0.5t
C. 20sin 2t
D. 20cos 2t
541.

A. 180
B. 90
C. 45
D. 120
542.

A. 1.96
B. 19.6
C. 196
D. 19600
543.

A. 2
B. 8
C. 6
D. 4
544.

A. 1/3
B. 2/3
C. 1
D. 3
545.

A. -0.75
B. 0.25
C. -0.25
D. 0.75
546.

A. 13.01
B. 26.02
C. 52.04
D. 104.08
547.

A. conservative
B. rotational
C. divergent
D. static
548.

B. curl(div v)
549.

A. 2.5cos t
B. 2.5sin t
C. 5cos t
D. 5sin t
550.

A. 6
B. -6
C. 0
D. 1
551.

A. j
B. i
C. b
D. h
552.

A. 28
B. 16
C. 12
D. 4
553.

A. –μ j
B. – μ i
C. –μ b
D. –μ h
554.

## Find the gradient of t = x2y+ ez at the point p(1,5,-2)

A. i + 10j + 0.135k
B. 10i + j + 0.135k
C. i + 0.135j + 10k
D. 10i + 0.135j + k
Answer» B. 10i + j + 0.135k
555.

## + z2 at (1,1,1)

A. i + j + k
B. 2i + 2j + 2k
C. 2xi + 2yj + 2zk
D. 4xi + 2yj + 4zk
Answer» B. 2i + 2j + 2k
556.

A. √4.01
B. √4.02
C. √4.03
D. √4.04
557.

A. 0.64
B. 0.72
C. 0.78
D. 0.80
558.

A. -8.014
B. -8.114
C. -8.214
D. -8.314
559.

A. true
B. false
560.

A. 600
B. 599.8
C. 588.9
D. 577.8
561.

A. 10
B. 12
C. 14
D. 16
562.

A. 80 π
B. 5 π
C. 75 π
D. 85 π
563.

A. 6100 π
B. 6200 π
C. 6300 π
D. 6400 π
564.

A. 20
B. 70/3
C. 80/3
D. 30
565.

A. 120π
B. 180π
C. 240π
D. 300π
566.

A. 8.15
B. 5.18
C. 1.518
D. 1.815
567.

A. 0.03
B. 0.05
C. 0.07
D. 0.09
568.

A. 4
B. 2
C. 8
D. 6
569.

A. true
B. false
570.

A. true
B. false
571.

A. 10-6
B. -10-6
C. 106
D. -106
572.

A. 1
B. 0.75
C. 0.5
D. 0.25
573.

A. 5.774
B. 6.774
C. 7.774
D. 8.774
574.

A. 105
B. 106
C. 107
D. 108
575.

A. 2.386
B. 3.386
C. 4.386
D. 5.386
576.

A. 18π
B. 24π
C. 36π
D. 72π
577.

A. 0
B. 1
C. 2
D. 3
578.

A. 3
B. 10/3
C. 11/3
D. 4
579.

A. 4/4.5
B. 3/4.5
C. 2/4.5
D. 1/4.5
580.

A. 17/6
B. -17/6
C. 13/6
D. -13/6
581.

A. 9
B. 4
C. 6
D. 3/2
582.

A. 2.1
B. 2.33
C. 2.5
D. 2.77
583.

A. -3.6j – 4k
B. -3.6j + 4k
C. 3.6j – 4k
D. 3.6j + 4k
584.

## , -2)

A. 2.467i + j + 1.167k
B. 2.467i – j + 1.167k
C. 2.467i – j – 1.167k
D. 2.467i + j – 1.167k
Answer» A. 2.467i + j + 1.167k
585.

## Transform the vector (4,-2,-4) at (1,2,3) into spherical coordinates.

A. 3.197i – 2.393j + 4.472k
B. -3.197i + 2.393j – 4.472k
C. 3.197i + 2.393j + 4.472k
D. -3.197i – 2.393j – 4.472k
Answer» B. -3.197i + 2.393j – 4.472k
586.

A. 500
B. 250
C. 1000
D. 2000
587.

A. 16.67
B. 2400
C. 2880
D. 0.06
588.

A. 200
B. 50
C. 400
D. 0.02
589.

A. 1.77
B. 2.25
C. 36
D. 144
590.

A. 3
B. 2
C. 60
D. 2.4
591.

A. 1.41
B. 3.5
C. 2.2
D. 1.73
592.

A. 350n
B. 0.035kn
C. 0.035n
D. 3.35kn
593.

A. 1m
B. 1cm
C. 10cm
D. 1mm
594.

A. 10mm
B. 100mm
C. 1000m
D. 1000cm
595.

A. v/m2
B. mv/m2
C. mv/m
D. vm
596.

A. 2mv/m
B. 4mv/m
C. 6mv/m
D. 8mv/m
597.

A. transistors
B. resistors
C. inductors
D. dc motors
598.

## The flow of electrons in dielectric is due to _________

A. conduction
B. potential difference
C. breakdown
D. resistance
599.

## Displacement current depends on ___________

A. moving charges
B. change in time
C. both moving charges and change in time
D. neither moving charges nor change in time
600.

## Paper capacitor is a type of _________

A. fixed capacitor
B. variable capacitor
C. either fixed or variable depending on its usage
D. neither fixed nor variable