A small sphere of mass m = 2gm having charge Q = 5 mc is suspended using an insulated string as shown in figure. The angle Ɵ made by the sphere with vertical if it is placed in an electric field of magnitude 2000 y/m towards right is a. tan–1 (5) b. tan–1 (0.5) c. tan–1 (2) d. tan–1 (0.2) Answer: (b) F = mg tan Ɵ... View Article
The circuit shown in the figure. Determine the current through Zener diode. (Given: Zener diode break down. Voltage V2 = 5.6 V) a. 7 mA b. 17 mA c. 10 mA d. 15 mA Answer: (c) I1 = I2 + Iz I2 = 10 mA.... View Article
The density of a circular disc is given as σ = [latex]{{p}_{0}}X[/latex] where ‘X’ is the distance from the centre. Its moment of interia about an axis perpendicular to interia about an axis perpendicular to its plane and passing through its edge is: a. b. c. d. Answer: (b) Using parallel axis dI = dmx2 + d MR2... View Article
An elastic string of Length 42 cm and cross section area 10–4 m2 is attached between two pegs at distance 6mm as shown in the figure. A particle of mass m is kept at mid point of string stretched as shown in figure by 20 cm and released. As the string attains natural Length, the particle attains a speed of 20 m/s. Then young modulus Y of string is of order. a. 108 b. 1012 c. 106 d. 104 Answer: (c) Elastic stream energy × volume = kinetic energy Y = [(0.05 x400 x0.42)/(0.2)2 x... View Article
10 particles each of mass 10-26 kg are striking perpendicularly on a wall of area 1 m2 with speed 104 m/s in 1 sec. The pressure on the wall if collision are perfectly elastic is: a. 2 N/m2 b. 4 N/m2 c. 6 N/m2 d. 8 N/m2 Answer: (a) Collision Frequency = 1022 ΔP per particle = mV2 = N/m2... View Article
A electric circuit is shown in figure. The potential different between the points A & B is: a. b. c. d. Answer: (a) Using nodal method... View Article
Dimension of [latex]sqrt{frac{{{varepsilon }_{0}}}{{{mu }_{0}}}}[/latex]are a. b. c. d. Answer: (b)... View Article
A carbon resistance with color bard is 200 Ω. If red bard is replaced by green bard then the new resistance is a. 500 Ω b. 300 Ω c. 400 Ω d. 100 Ω Answer: (a) Red 2 Green 5 New resistance 500 Ω... View Article
22 July 2021: PIB Summary & Analysis TABLE OF CONTENTS 1. PLI Scheme for Specialty Steel 2. Bhartiya Prakritik Krishi Padhati (BPKP) 3. Indian Navy Exercises with Royal Navy... View Article
