Author: admin

Electromagnetic Waves Objective Maxwell in his famous equations of electromagnetism introduced the concept of (a) ac current (b) displacement current (c) impedance (d) reactance Answer: (b) displacement current The conduction current is same as displacement current when source is (a) ac only (b) dc only (c) either ac or dc (d) neither dc nor ac […]

Alternating Current Objective Alternating voltage (V) is represented by the equation (a) V(t) = Vm eωt (b) V(t) = Vm sin ωt (c) V(t) = Vm cot ωt (d) V(t) = Vm tan ωt Answer: (b) V(t) = Vm sin ωt In the case of an inductor (a) voltage lags the current by π/2 (b) voltage leads the current by π/2 (c) […]

Electromagnetic Induction Objective The north pole of a long bar magnet was pushed slowly into a short solenoid connected to a short galvanometer. The magnet was held stationary for a few seconds with the north pole in the middle of the solenoid and then withdrawn rapidly. The maximum deflection of the galvanometer was observed when […]

Magnetism and Matter Objective Questions The earth behaves as a magnet with magnetic field pointing approximately from the geographic (a) North to South (b) South to North (c) East to West (d) West to East Answer: (b) South to North The strength of the earth’s magnetic field is (a) constant everywhere. (b) zero everywhere. (c) […]

Moving Charges and Magnetism Objective Questions A charged particle is moving in a cyclotron, what effect on the radius of path of this charged particle will occur when the frequency of the ratio frequency field is doubled? (a) It will also be doubled. (b) It will be halved. (c) It will be increased by four […]

Current Electricity Objective Questions An electric heater is connected to the voltage supply. After few seconds, current gets its steady value then its initial current will be (a) equal to its steady current (b) slightly higher than its steady current (c) slightly less than its steady current (d) zero Answer: (b) slightly higher than its […]

Electrostatic Potential and Capacitance Objectives The dimensions of fall of potential per unit distance are given by: (a) [MLT-3 A-1] (b) [ML2T-2A-1] (c) [ML2T-2A-3] (d) [MLT-2A-2] Answer: (c) [ML2T-2A-3] Which of the following is blocked by a capacitor ? (a) A.C. (b) D.C. (c) Both A.C. and D.C. (d) Neither A.C. nor D. C Answer: (b) […]

Electric Charges and Fields Objective Which one of the following is the unit of electric field? (a) Coulomb (b) Newton (c) Volt (d) N/C Answer: (d) N/C Three charges + 3q + q and Q are placed on a st. line with equal separation. In order to maket the net force on q to be […]