MCQOPTIONS
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MCQOPTIONS
This section includes 1085 Mcqs, each offering curated multiple-choice questions to sharpen your Electronics & Communication Engineering knowledge and support exam preparation. Choose a topic below to get started.
| 101. |
The two conductors of a transmission line carry equal current I in opposite directions.The force on each conductor is |
| A. | proportional to 7 |
| B. | proportional to X |
| C. | proportional to distance between the conductors |
| D. | inversely proportional to I |
| Answer» C. proportional to distance between the conductors | |
| 102. |
If an ohmmeter reading immediately goes practically to zero and stays there, capacitoris |
| A. | charged |
| B. | short-circuited |
| C. | lossy |
| D. | satisfactory |
| Answer» C. lossy | |
| 103. |
Those materials are well suited for making permanent magnets whichhave______retentivity and _______coercivity. |
| A. | low, high |
| B. | high, high |
| C. | high, low |
| D. | low, low |
| Answer» C. high, low | |
| 104. |
The combined effect of electric dipoles is seen in _________. |
| A. | polarization |
| B. | magnetization |
| C. | both (a) and (b) |
| D. | none of these |
| Answer» B. magnetization | |
| 105. |
Permeability of vacuum is given as _________. |
| A. | 4 × 10−7 H/m |
| B. | 14 × 10−7 H/m |
| C. | 4 × 10−9 H/m |
| D. | 14 × 10−9 H/m |
| Answer» B. 14 × 10−7 H/m | |
| 106. |
Magnetic dipole moment is a product of __________. |
| A. | Current and area |
| B. | Area and its direction |
| C. | Current, area and its direction |
| D. | None of these |
| Answer» D. None of these | |
| 107. |
For a lossy dielectric medium, ____________. |
| A. | σ = 0 |
| B. | σ ≠ 0 |
| C. | None of these |
| D. | Cannot say |
| Answer» C. None of these | |
| 108. |
In terms of Spherical coordinate system variables, y of Cartesiancoordinate system is given as __________. |
| A. | r sin θ cos φ |
| B. | r sin θ sin φ |
| C. | r cos θ sin φ |
| D. | r cos θ cos φ |
| Answer» C. r cos θ sin φ | |
| 109. |
A large aperture means antenna gain will be__________. |
| A. | Large |
| B. | Small |
| C. | None of these |
| D. | Cannot say |
| Answer» C. None of these | |
| 110. |
A scalar quantity has __________. |
| A. | magnitude |
| B. | direction |
| C. | both (a) and (b) |
| D. | none of these |
| Answer» B. direction | |
| 111. |
Maxwell's equations shelter on __________ law(s). |
| A. | Faraday's |
| B. | Gauss's |
| C. | Ampere's |
| D. | All of these |
| Answer» E. | |
| 112. |
Biot–Savart's Law can be applied to __________ length current- carrying conductors. |
| A. | Large |
| B. | Medium |
| C. | Small |
| D. | Very small |
| Answer» E. | |
| 113. |
Which of the following capacitors will have the least value ofbreakdown voltage ? |
| A. | Mica |
| B. | Paper |
| C. | Ceramic |
| D. | Electrolytic |
| Answer» E. | |
| 114. |
field is associated with the capacitor. |
| A. | Electric |
| B. | Magnetic |
| C. | Both (a) and (b) |
| D. | None of the above |
| Answer» B. Magnetic | |
| 115. |
Inductor stores energy in ________ field. |
| A. | electric |
| B. | magnetic |
| C. | gravity |
| D. | none of these |
| Answer» C. gravity | |
| 116. |
________ vector is needed to determine power flow in wave guides. |
| A. | Poynting |
| B. | Average Poynting |
| C. | Power |
| D. | Phase |
| Answer» C. Power | |
| 117. |
The force between two charges is 120 N. if the distance between thecharge is doubled, the force will be |
| A. | 60 N |
| B. | 30 N |
| C. | 40 N |
| D. | 15 N |
| Answer» C. 40 N | |
| 118. |
The ability of charged bodies to exert force on any another isattributed to the existence of |
| A. | Electrons |
| B. | Protons |
| C. | Neutrons |
| D. | Electric field |
| Answer» D. Electric field | |
| 119. |
Energy stored in the electric field of a capacitor C when charged froma D.C source of voltage V is equal to joules |
| A. | CV2 |
| B. | C2V |
| C. | CV3 |
| D. | CV |
| Answer» B. C2V | |
| 120. |
Divergence at a point is positive if field lines are _________ |
| A. | diverging |
| B. | converging |
| C. | both (a) an (b) |
| D. | none of these |
| Answer» B. converging | |
| 121. |
SNR ranges from ______. |
| A. | 0 to 1 |
| B. | 1 to 10 |
| C. | 10 to 100 |
| D. | 1 to ∞ |
| Answer» E. | |
| 122. |
Line integral of an electric field around a closed path is __________. |
| A. | infinity |
| B. | unity |
| C. | zero |
| D. | None of these |
| Answer» D. None of these | |
| 123. |
Standing wave consists of two travelling waves of ____________ amplitudes and _____________ is direction. |
| A. | Unequal, same |
| B. | Unequal, opposite |
| C. | Equal, same |
| D. | Equal, opposite |
| Answer» E. | |
| 124. |
Antenna tuning is done by changing its___________. |
| A. | Inductive reactances |
| B. | Capacitive reactances |
| C. | Both (a) and (b) |
| D. | None of these |
| Answer» D. None of these | |
| 125. |
Divergence Theorem is applicable for a ________ that is bounded bya _________. |
| A. | volume, surface |
| B. | surface, volume |
| C. | surface, line |
| D. | line, surface |
| Answer» B. surface, volume | |
| 126. |
In the Cylindrical coordinate system, φ ranges from _____________. |
| A. | 0 to less than π |
| B. | 0 to less than 2π |
| C. | 0 to less than 3π |
| D. | 0 to less than 4π |
| Answer» C. 0 to less than 3π | |
| 127. |
Which of the following is/are scalar quantity(s)? |
| A. | distance |
| B. | density |
| C. | temperature |
| D. | all of these |
| Answer» E. | |
| 128. |
In a fully lossless line, σ = _________. |
| A. | 0 |
| B. | 1 |
| C. | ∞ |
| D. | None of these. |
| Answer» D. None of these. | |
| 129. |
The combined effect of magnetic dipoles is seen in _________. |
| A. | polarization |
| B. | magnetization |
| C. | both (a) and (b) |
| D. | none of these |
| Answer» C. both (a) and (b) | |
| 130. |
Waves are used in __________. |
| A. | TV |
| B. | Radio |
| C. | Radar |
| D. | All of these |
| Answer» E. | |
| 131. |
For those surfaces where surface charge density is __________ normal component of electric flux density is continuous. |
| A. | Infinity |
| B. | Unity |
| C. | Zero |
| D. | None of these |
| Answer» D. None of these | |
| 132. |
Which of the following is not a non-polar dielectric? |
| A. | water |
| B. | oxygen |
| C. | CO2 |
| D. | alcohol |
| Answer» C. CO2 | |
| 133. |
Magnetic flux density is the same as __________. |
| A. | Magnetic induction |
| B. | Magnetic field strength |
| C. | Both (a) and (b) |
| D. | None of these |
| Answer» D. None of these | |
| 134. |
A capacitor charged to 200 V has 2000 (iC of charge. The value ofcapacitance will be |
| A. | 10 F |
| B. | 10 uF |
| C. | 100 nF |
| D. | 1000 uF |
| Answer» C. 100 nF | |
| 135. |
In__________array, radiation is perpendicular to array orientation. |
| A. | Broadside |
| B. | End fire |
| C. | None of these |
| D. | Cannot say |
| Answer» B. End fire | |
| 136. |
Maxwell's equations in __________ form give unformation at pointsof discontinuity in electromagnetic fields. |
| A. | Differential |
| B. | Integral |
| C. | Algebraic |
| D. | None of these |
| Answer» C. Algebraic | |
| 137. |
Del operator is ______________. |
| A. | same as the gradient operator |
| B. | vector differential operator |
| C. | both (a) an (b) |
| D. | none of these |
| Answer» D. none of these | |
| 138. |
In a Spherical coordinate system, r is given as ___________. |
| A. | (x + y + z) |
| B. | (x2 + y2 + z2) |
| C. | (x2 + y2 + z2)1/2 |
| D. | none |
| Answer» D. none | |
| 139. |
The electrostatic force between two charges of one coulomb each andplaced at distance of 0.5 m will be |
| A. | 36 x 10fa |
| B. | 36 x 107 N |
| C. | 36 x 108 N |
| D. | 36 x 109 N |
| Answer» E. | |
| 140. |
Spherical coordinate system is a _________. |
| A. | right-handed syste. |
| B. | left-handed system |
| C. | both (a)and (b) |
| D. | none of these |
| Answer» B. left-handed system | |
| 141. |
Which of the following is not an inductor? |
| A. | toroid |
| B. | transmission line |
| C. | solenoid |
| D. | none of these |
| Answer» E. | |
| 142. |
Curl of electrostatic field is __________. |
| A. | ∞ |
| B. | 1 |
| C. | None of these |
| Answer» D. | |
| 143. |
Elliptical polarization can be of___________. |
| A. | Left hand |
| B. | Right hand |
| C. | Either (a) or (b) |
| D. | None of these |
| Answer» D. None of these | |
| 144. |
Array factor depends upon__________. |
| A. | Number of elements |
| B. | Spacing among elements |
| C. | Phase of the applied signal |
| D. | All of these |
| Answer» E. | |
| 145. |
An is equal to _____________. |
| A. | n A |
| B. | nAn−1 A |
| C. | nAn A |
| D. | nA |
| Answer» C. nAn A | |
| 146. |
When 4 volts e.m.f. is applied across a 1 farad capacitor, it will storeenergy of |
| A. | 2 joules |
| B. | 4 joules |
| C. | 6 joules |
| D. | 8 joules |
| Answer» E. | |
| 147. |
Gradient represents the __________ of maximum space rate ofincrease of a scalar field. |
| A. | magnitude |
| B. | direction |
| C. | both (a) an (b) |
| D. | none of these |
| Answer» D. none of these | |
| 148. |
Laplacian of a vector is ___________ of gradient of its divergence and its curl of curl. |
| A. | addition |
| B. | difference |
| C. | multiplication |
| D. | division |
| Answer» C. multiplication | |
| 149. |
A vector quantity has __________. |
| A. | magnitude |
| B. | direction |
| C. | both (a) and (b) |
| D. | none of these |
| Answer» D. none of these | |
| 150. |
Potential energy _____ if a test charge is moved from a lowerpotential point to a higher potential point. |
| A. | Remains the same |
| B. | Increases |
| C. | Decreases |
| D. | Becomes zero |
| Answer» C. Decreases | |