High voltage transmission line is preferred as (a) Its appliances are less costly (b) Thin power cables are required (c) Idle current very low (d) Power loss is very less

If 100 J of work has to be done in moving an electric charge of 4 C from a place, where potential is -10 volt to another place where potential is V volt,find the value of V. (a) 5 V (b) 10 V (c) 25 V (d) 15 V

If the angle of dip at two places are 30° and 45° respectively, then the ratio of horizontal components of the earth’s magnetic field at the two places will be

If the charge on each plate of a capacitor of 60μF is 3x\(10^{-8}\)C, then energy stored in the capacitor will be (a) 2.5x\(10^{-15}\)J (b) 1.5x\(10^{-14}\)J (c) 3.5x\(10^{-13}\)J (d) 7.5x\(10^{-12}\)J

In a circuit with a coil of resistance 3Ω, the magnetic flux changes from 1.0 Wb to 10.0 Wb in 0.3 s. The charge that flows in the coil during this time is (a) 2.0 C (b) 3.0 C (c) 4.0 C (d) 1.0 C

In a meter bridge as shown, the balance point is found to be at 39.5 cam from the end A, when the resistor Y is of 12.5 Ω. Determine the balance point of the bridge above if X and Y are interchanged. (a) 8.2 Ω, 40.6 cm (b) 8.2 Ω, 60.4 cm (c) 6.2 Ω, 60.4 cm (d) 6.2 Ω, 39.6 cm

In a purely resistive a.c. circuit, the current (a) is in phase with the e.m.f. (b) leads the e.m.f. by a difference of π radians phase (c) leads the e.m.f. by a phase difference of π/2 radians (d) lags behind the e.m.f. by a phase difference of π/4 radians

In a region of constant potential, (a) the electric field is uniform (b) the electric field is zero (c) there can be no charge inside the region (d) the electric field shall necessarily change, if a charge is placed outside the region

In electric arc furnace Cu or Iron is melted due to variation of (a) current (b) magnetic field (c) voltage (d) electric field

In highly inductive load circuit, it is more dangerous when (a) we close the switch (b) open the switch (c) increasing the resistance (d) decreasing the resistance

In series R-L-C circuit, quality factor can be improved by (a) decreasing L (b) increasing C (c) decreasing R (d) decreasing R & L

In the above diagram \(C_2\) is twice of Capacitance of \(C_1\) which is C. Find the ratio of energy stored in the combination before and after the insertion of of a dielectric constant K in both the capacitors.(Battery is disconnected)

In Young’s double slit experiment, the fringe width is β . If the entire arrangement is now placed inside a liquid of refractive index μ , the fringe width will become (a) μ β (b) β/μ (c) β/μ+1 (d) β/μ−1

In Young’s double-slit experiment, the phase difference between the light waves reaching the third bright fringe from the central fringe will be (λ=6000 Å) (a) zero (b)2 (c) 4 (d) 6

Minimum number of capacitor of 2μF each required to obtain a capacitance of 5μF will be: (a) 4 (b) 3 (c) 5 (d) 6