# Objective Type Question or MCQ of Electrical Circuits and Magnetic Fields page-17

241. Which of the following statement is true?

a) Div curl B = ∞
b) Div curl A = 0
c) Div curl B = 1
d) Div curl B = B

Ans: (b)

242. If X = q/4πr2, which of the following parameter will be X?

a) Electric field strength
b) Magnetic field strength
c) Electric displacement density
d) Permeability

Ans: (c)

243. Which of the following expression is correct for electric field strength?

a) E = D
b) E = πD
c) E = D/ε
d) E = r/ε

Ans: (c)

244. Which of the following distance in terms of wavelength is correct if the distance is measured between maxima and minima of standing wave?

a) λ/2
b) λ/8
c) 4λ
d) λ/4

Ans: (d)

245. Polarization in the electromagnetic waves is attributed to

a) absorptive nature of waves
b) reflection of waves
c) longitudinal nature of waves
d) transverse nature of waves
e) electric field of waves

Ans: (d)

246. Which of the equation represents the following wavefrom?

a) y = sin⁡x/3
b) x = 2 sin⁡3x/2
c) y = 2sin⁡3x
d) y = 2 sin⁡2x
e) y = 2 sin⁡x

Ans: (c)

247. If 0 < θ1 < θ2 < π/2, which of the following statement is true ?

a) sin⁡θ1 < sin⁡θ2
b) cos⁡θ1 < cos⁡θ2
c) tan⁡θ1 < tan⁡θ2
d) (a)and (c) only
e) (b) and (c) only
f) (a) and (b) only

Ans: (d)

248. Which of the following statement is true?

a) The magnetic field inside the conductor is zero
b) The magnetic field inside the semiconductor is zero
c) The magnetic field inside superconductor is zero
d) The magnetic field inside the superconductor is zero

Ans: (c)

249. Wein Bridge may be used for

a) Resistance determination
b) Frequency measurements
c) Power factor measurements
d) Harmonic distortion analysis
e) Both (b) and (d)

Ans: (e)

250. The D’Arsonval instruments work on the principle of

a) Moving coil instruments
b) Moving iron instruments
c) Potentiometric instruments
d) Permanent magnet moving coil instruments
e) Induction instruments

Ans: (d)

251. When any material has negative magnetism, the material is called as

a) Paramagnetic
b) Diamagnetic
c) Ferromagnetic
d) Antiferromagnetic

Ans: (b)

252. The bar magnet has

a) The dipole movement
b) Monopole movement
c) (a) and (c) both
d) None of the above

Ans: (a)

253. There is no such material which has properties of magnetic monopole.

a) True
b) False

Ans: (b)

254. Which of the following materials are diamagnetic?

a) Copper
b) Silver
c) Copper and silver
d) Iron

Ans: (c)

255. When of the following material fall in the category of paramagnetic materials?

a) Copper
b) Iron
c) Copper and iron
d) Nickel
e) None of the above

Ans: (d)

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