Top 250+ Solved Electromagnetic Field MCQ Questions Answer
Q. Which of the following capacitor has relatively shorter shelf life?
a. Mica capacitor
b. Electrolytic capacitor
c. Ceramic capacitor
d. Paper capacitor
Q. The sparking between two electrical contacts can be reduced byinserting a
a. Capacitor in parallel with contacts
b. Capacitor in series with each contact
c. Resistance in line
d. None of the above
Q. In the case of lossy capacitor, its series equivalent resistance value will be
a. Small
b. Very small
c. Large
d. Zero
Q. The power dissipated in a pure capacitor is
a. Zero
b. Proportional to applied voltage
c. Proportional to value of capacitance
d. Both (b) and (c) above
Q. The force between two charges is 120 N. If the distance between thecharges is doubled, the force will be
a. 60 N
b. 30 N
c. 40 N
d. 15 N
Q. The electric field intensity at a point situated 4 metres from a pointcharge is 200 N/C. If the distance is reduced to 2 metres, the field intensity will be
a. 400 N/C
b. 600 N/C
c. 800 N/C
d. 1200 N/C
Q. The lines of force due to charged particles are
a. always straight
b. always curved
c. sometimes curved
d. none of the above
Q. The electric field at a point situated at a distance d from straight charged conductor is
a. proportional to d
b. inversely proportional to d
c. inversely proportional to d
d. none of the above
Q. The direction of electric field due +0 positive charge is .
a. away from the charge
b. towards the charge
c. both (a) and (b)
d. none of the above
Q. A field line and an equipotential surface are
a. always parallel
b. always at 90°
c. inclined at any angle 0
d. none of the above
Q. The ability of charged bodies to exert force on 6ne another isattributed to the existence of
a. electrons
b. protons
c. neutrons
d. electric field
Q. If the sheet of a bakelite is inserted between the plates of an air capacitor, the capacitance will
a. decrease
b. increase
c. remains unchanged
d. become zero
Q. For making a capacitor, it is better to select a dielectric having
a. low permittivity
b. high permittivity
c. permittivity same as that of air
d. permittivity slightly more than that of air
Q. If three 15 uF capacitors are connected in series, the net capacitance is
a. 5 uF
b. 30 uF
c. 45 uF
d. 50 uF