# Archives

## Carbon Footprint & Carbon Watch

Carbon Footprint of an individual can be assessed through a mobile app, Carbon Watch.Â  Carbon Footprint and Carbon Watch have been in news... View Article

## National Mission of Justice Delivery and Legal Reforms

The Union Cabinet of India, on June 23, 2011, approved the proposal for a National Mission for Justice Delivery and Legal Reforms in the country.... View Article

## 16 July 2021: The Hindu Analysis

UPSC Current Affairs Preparation: The Hindu Analysis Watch expert analysis of â€˜The Hinduâ€™ dated 16th Jul 2021. Important news and views to boost... View Article

## Gist of EPW July Week 1, 2021

The Economic and Political Weekly (EPW) is an important source of study material for IAS, especially for the current affairs segment. In this... View Article

## A 2 W carbon resistor is color coded with green, black, red and brown respectively. The maximum current which can be passed through this resistor is :

a. 0.4 mA b. 20 mA c. 63 mA d. 100 mA Answer: b P = i2R For imax. R should be minimum. From colour coding R = 50Ã—102 ohm imax= 20 mA... View Article

## A potentiometer wire AB having length L and resistance 12r is joined to a cell D of emf ε and internal resistance 3r is connected. The length AJ at which the galvanometer as shown in fig. shows no deflection is :

a. (13/24) L b. (5/12) L c. (11/24) L d. (11/12) L Answer: a Potential gradient =( ε/12r+r)Ã—(12r/L)] =... View Article

## A TV transmission tower has a height of 140 m and the height of the receiving antenna is 40 m. What is the maximum distance upto which signals can be broad casted from this tower in LOS(Line of Sight) mode? (Given : radius of earth =6.4Ã—106m)

a. 40 km b. 80 km c. 65 km d. 48 km Answer: c Given height of the transmission tower, ht = 140 m Height of the receiving antenna, hr = 40... View Article

## To get output â€˜1â€™ at R, for the given logic gate circuit the input values must be :

a. X = 0, Y = 0 b. X = 0, Y = 1 c. X = 1, Y = 0 d. X = 1, Y = 1 Answer: c Q = O/P = To make O/P P+Q should be â€˜Oâ€™ Hence X = 1... View Article

## Using a nuclear counter the count rate of emitted particles from a radioactive source is measured. At t = 0 it was 1600 counts per second and t = 8 seconds it was 100 counts per second. The count rate observed, as counts per second, at t = 6 seconds is close to :

a. 150 b. 200 c. 360 d. 400 Answer: b At t = 0, A0 = dN/dt = 1600 C/s At t = 8s, A = 100 C/s A/A0 = 1/16 in 8 seconds Hence half life... View Article

## In an electron microscope, the resolution that can be achieved is of the order of the wavelength of electrons used. To resolve a width of 7.5Ã—10-12 m, the minimum electron energy required is close to :

a. 1 keV b. 25 keV c. 500 keV d. 100 keV Answer: b Given λ = 7.5Ã—10-12 h = λ = h/P P = h/λ KE = P2/2m =... View Article