Category Archives : GS Prelims


1000 Prelims MCQs with detailed explanation @ Rs 350

The 1000 MCQs with detailed explanation contains all the 10 mock tests and their solutions provided in the GS Prelims Test Series 2015. This is being now provided at a discounted price of only Rs 350. The MCQs are still relevant for the upcoming UPSC Prelims exam and will provide the necessary practice and revision. You can go through this link containing prelims MCQs to get an idea about the standard and quality of questions.   How to buy You need to make the payment… Continue Reading »


Primary air pollutants and their sources

What are primary air pollutants (PAPs)? Primary air pollutants (PAPs) are those that are emitted directly into the air from sources. Examples – Sulphur dioxide, nitrogen oxides, carbon monoxide, volatile organic matter, particulate matters, lead, ammonia etc. How PAPs impact environment? They can have effects both directly and as precursors of secondary air pollutants (chemicals formed through reactions in the atmosphere), which are discussed in the following section. What are secondary air pollutants? A secondary pollutant is not directly emitted as such, but forms when… Continue Reading »


Ocean Acidification and its effect on marine ecosystem

What is ocean acidification?   Since the beginning of the industrial revolution, the release of carbon dioxide (CO2) from humankind’s industrial and agricultural activities has increased the amount of CO2 in the atmosphere. The oceans currently absorb about a third of human-created CO2 emissions, roughly 22 million tons a day.When carbon dioxide dissolves in this ocean, carbonic acid is formed. CO2 reacts with water molecules (H2O) and forms the weak acid H2CO3 (carbonic acid). Most of this acid dissociates into hydrogen ions (H+) and bicarbonate… Continue Reading »


Bioindicators – mechanism, uses, advantages and examples

What are bioindicators? A bioindicator is a living organism that gives us an idea of the health of an ecosystem. Some organisms are very sensitive to pollution in their environment, so if pollutants are present, the organism may change its morphology, physiology or behaviour, or it could even die.   What can be a bioindicator? Bioindicators can be plants, animals or microorganisms.   How various bioindicators tell about the environmental health? 1. If toxins are present, certain plants may not be able to grow in… Continue Reading »


Digilocker website

What is exactly the DigiLocker website created by the Government of India? Is it authentic and working? Consider this – You are going for an interview. You need to produce your original certificates at the time of interview. Now, if the venue of interview happens to be out of your town, there is this problem of safety of your original certificates. When I went for my interview to Delhi, I was unable to sleep properly during the journey as I was worried about my certificates.… Continue Reading »


Concepts – Fiscal deficit, deflation and devaluation

What is Fiscal Deficit? A government has many expenditures like salaries & payments of staff, funds for various schemes, loans and grants that it makes, contingency expenditures like those of disasters and compensation etc. Similarly it has many revenue sources like – interests it receives on loans given, revenues from disinvestment, revenues generated from selling resources like spectrum, oil, minerals etc. These type of revenues do not create any debt as government do not have to payback anything to anyone. For eg. revenues from spectrum… Continue Reading »


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