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World Heritage in Danger List

The World Heritage in Danger List is compiled by UNESCO. In July 2021, Australia’s Great Barrier Reef was put on the list which drew criticism... View Article

23 July 2021: UPSC Exam Comprehensive News Analysis

CNA 23rd July 2021:- Download PDF Here TABLE OF CONTENTS A. GS 1 Related B. GS 2 Related POLITY AND GOVERNANCE 1. ‘HC appointments an ongoing... View Article

A conducting sphere is enclosed by a hollow conducting shell. Initially the inner sphere has a charge Q. While the outer one is un charged. The potential difference between the two spherical surface is found to be V. Later on the outer shell is given a charge – 4Q. The new potential difference between the two surface.

a. 1V b. V c. – 2V d. 2V Answer: (b) ΔV = V... View Article

a circular loop of radius r having n number of turns carries current is placed in a uniform magnetic field parallel to the plane of the loop the torque on the loop is

a. b. c. d. Answer: (a) τ = M × B = MB sin Ɵ = NI πr2 ×B(1) = NI πr2B... View Article

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

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World Heritage in Danger List

23 July 2021: UPSC Exam Comprehensive News Analysis

a circular loop of radius r having n number of turns carries current is placed in a uniform magnetic field parallel to the plane of the loop the torque on the loop is

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

The circuit shown in the figure. Determine the current through Zener diode. (Given: Zener diode break down. Voltage V₂ = 5.6 V)

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:

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 electric circuit is shown in figure. The potential different between the points A & B is:

Dimension of [latex]sqrt{frac{{{varepsilon }_{0}}}{{{mu }_{0}}}}[/latex]are

A carbon resistance with color bard is 200 Ω. If red bard is replaced by green bard then the new resistance is

22 July 2021: PIB Summary & Analysis

If the roots of (k+1)x² – 2(k+1)x +1 = 0 are real and equal ; then find the value of k

Write down the domain and range of sinx.

Please help me. change into passive voice

State difference between the blood vessels artery vein and capillary.

All desire wealth and some acquire it. Change into passive

What is the noun form of the word free?

Arrangement of flowers on the floral axis of plant is: A.Inflorescence B.Phyllotaxy C.Placentation D.Corymb