Latest Posts

A short straight object of height 100 cm lies before the central axis of a spherical mirror whose focal length has absolute value |f| = 40 cm. The image of the object produced by the mirror is of height 25 cm and has the same orientation as the object. One may conclude from the information:

a. Image is real, same side of concave mirror b. Image is virtual, opposite side of convex mirror. c. Image... View Article

Given below are two statements: one is labelled as Assertion A and the other is labelled as Reason R. Assertion... View Article

Find the electric field E at point P (as shown in the figure) on the perpendicular bisector of a uniformly... View Article

a. 2π√R/g b. (1/2π)√(g/R) c. 2πR/g d. g/2πR Answer: (a) cos θ = x/d If displaced from equilibrium position, Frestoring... View Article

Find the gravitational force of attraction between the ring and sphere as shown in the diagram, where the plane of... View Article

Five equal resistances are connected in a network as shown in the figure. The net resistance between points A and... View Article

[h = 6.63×10–34 Js and c = 3×108 ms–1] a. 654 nm and red colour b. 1046 nm and blue... View Article

a. ρK/P b. K/ρP c. PK/ρ d. ρP/K Answer: (d) Bulk modulus K = -P/(ΔV/V) We know, ρ = M/V... View Article

a. ⅘ ma2 b. (8/5) ma2 + mb2 c. ⅘ ma2 + 2mb2 d. (8/5) ma2 + 2mb2 Answer: (d)... View Article

Given below are two statements: one is labelled as Assertion A and the other is labelled as Reason R. Assertion... View Article

a. 0.75 mm b. 0.50 mm c. 1 mm d. 0.25 mm Answer: (d) Fringe width (β) = λD/d d... View Article

The temperature θ at the junction of two insulating sheets, having thermal resistances R1 and R2 as well as the... View Article

a. 1 : 3 b. 1 : 9 c. 7 : 135 d. 7 : 108 Answer: (c) For Lyman... View Article

Time period of a simple pendulum is T. The time taken to complete ⅝ oscillations starting from mean position is... View Article

Answer: 60 Given: V = KT2/3 V3/2 = (K)3/2 T TV–3/2 = const. ……(1) and TV γ-1 = const.……(2) From... View Article

Answer: 243 The self – energy of the sphere (conducting) U = kq2/2r For small drop →Ui = kq2/2r …….(1)... View Article

In the reported figure of the earth, the value of acceleration due to gravity is the same at point A... View Article

The Zener diode has a VZ = 30 V. The current passing through the diode for the following circuit is______mA.... View Article

A point source of light S, placed at a distance 60 cm in front of the centre of the plane... View Article

Answer: 1 According to Einstein’s law of PE effect Emax = E – ϕ E1 = 2 ϕ, k1 =... View Article