Applying Logic in Upsc General Studies Prel

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Applying logic in UPSC GeneralStudies Prelims

No, the heading of the post is not incorrect. You may think that logic

is to be used in paper 2 (informally CSAT) and not in general

studies. However, we can and we must use logic in general studies

prelims paper as well. Given the vastness of UPSC syllabus, it’s just

not possible to cover everything. Nevertheless basics can be covered

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and then we can apply logic to answer what may seem a

difficult/advanced question.

What I call logic here, is essentially a composition of three

techniques –

1. Applying basic knowledge to solve advanced/difficult questions

2. Avoiding extremeties

3. Calculated guess and risk

Let’s try to understand these by taking examples from actual UPSC

paper.

1. Applying basic knowledge to solve advanced/difficult questions

When you come across a question that may seem difficult or is from

a topic/area that you have not covered, NEVER EVER think that you

won’t be able to answer it. Most people, however do exactly this. If

they had left any topic and a question comes up from that , they

already have formed an opinion that they won’t be able to answer it

and in most cases skip the question without reading/trying it.

For e.g consider that you have not read in detail about animals

found in India. This question then comes up. It’s from UPSC prelims

2012

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Consider the following:

1. Black necked crane

2. Cheetah

3. Flying squirrel

4. Snow leopard

Which of the above are naturally found in India?

a) 1, 2 and 3 only

b) 1, 3 and 4 only

c) 2 and 4 only

d) 1, 2, 3 and 4

Now, you haven’t even heard of animals like black necked crane or

flying squirrel. So, you thought you don’t have enough knowledge

about these and it will be better to skip it. But read the options

properly. Now, cheetah is not found naturally in India and this fact

is something which you might be knowing even if you have not read

animals in detail. So, if you just eliminate cheetah, statement 2 that

is – you get only one option remaining and that has to be the

answer.

Actually, UPSC just wanted to test your basic knowledge that

whether you know about cheetah being not found naturally in India

or not. It just made the questionm a bit complex to scare you. So,

the advanced and difficult looking question was infact just a basic

and easy one.

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Another one, again from UPSC prelism 2012

Lead, ingested or inhaled, is a health hazard. After the addition of

lead to petrol has been banned, what still are the sources of lead

poisoning?

1. Smelting units

2. Pens and pencils3. Paints

4. Hair oils and cosmetics

select the correct answer using the codes given below:

a) 1, 2 and 3 only

b) 1 and 3 only

c) 2 and 4 only

d) 1, 2, 3 and 4

Now you are no chemistry expert and have no idea where all lead is

used and therefore decides to skip the question. But wait, UPSC is

not looking for a chemical expert either. The question itself states

that lead has been banned from use in petrol as it’s toxic. So now

just think if that is the case, will lead be allowed to be used in pens

and pencils which are used by children and most of them put it in

their mouth? So, eliminate statement 2 about pens and pencils and

there you get your answer.

Okay, another example again from chemistry. This is from UPSC

prelims 2013

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Due to improper/indiscriminate disposal of old and used computers

or their parts, which of the following are released into the

environment as e-waste?

1. Beryllium

2. Cadmium

3. Chromium

4. Heptachlor

5. Mercury

6. Lead

7. Plutonium

Select the correct answer using codes given below.

a) 1, 3, 4, 6 and 7 only

b) 1, 2, 3, 5 and 6 onlyc) 2, 4, 5 and 7 only

d) 1, 2, 3, 4, 5, 6 and 7

OMG. Such a long question with so many elements, better leave

this. But again, just apply some common knowledge. Plutonium is a

radioactive element used for nuclear purposes. Will that be used in

computers? No, never and there you get your answer by eliminatingplutonium

The technique here again is eliminating options on the basic

knowledge we have.

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Let’s take another example from UPSC prelims 2012

If there were no phenomenon of capillarity

1. it would be difficult to use a kerosene lamp

2. one would not be able to use a straw to consume a soft drink

3. the blotting paper would paper would fail to function4. the big trees that we see around would not have grown on the

earth

Which of the following statements given above are correct?

a) 1, 2 and 3 only

b) 1, 3 and 4 only

c) 2 and 4 only

d) 1, 2, 3 and 4

Read statement 2 again. Now, even if capillarity was non-existent,

we could still use a straw to drink isn’t it. So, statement 2 has to be

incorrect, and that also helps us give our answer.

Remember, most of time if a question is complex, UPSC itself will

give you enough hints to get to the answer. The point is are yousmart enough to deduce that hint.

2. Avoiding extremities



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UPSC seeks a candidate with balanced thought, right? Many times,

UPSC gives such extreme statements in it’s question which cannot

be true. You need to find this out which can immensely help you in

answering the question. Statements with all, only, completelt etc are

in most cases incorrect. I am saying most cases and not always.

Let’s try to understand this through examples. This is from UPSC2011 prelims

At present , scientists can determine the arrangement or relative

positions of genes or DNA sequences on a chromosome. How does

this knowledge benefit us ?

1. It is possible to know the pedigree of livestock.

2. It is possible to understand the causes of all human diseases.3. It is possible to develop disease-resistant animal breeds.

Which of the statements give above is/are correct ?

a) 1 and 2 only

b) 2 only

c) 1 and 3 only

d) 1,2, and 3

Read statement 2 again – It is possible to understand the causes of

all human diseases. ALL human dieseas. Is that possible. Does your

rational mind allows you to say that this statement can be correct.

It’s not possible, statement is incorrect, eliminate 2 and you get your

answer.



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So, you see again UPSC gave you enough hint for a complex

question.

Okay, now a question on history from UPSC 2013 prelims

The Chinese traveller Yuan Chwang (Hiuen Tsang) who visited India

recorded the general conditions and culture of India at that time. In

this context, which of the following statements is/are correct?

1. The roads and river-routes were completely immune from

robbery.

2. As regards punishment for offences, ordeals by fire, water and

poison were the instruments for determining the innocence or guilt

of a person.

3. The tradesmen had to pay duties at ferries and barrier stations.Select the correct answer using the codes given below.

(a) 1 only

(b) 2 and 3 only

(c) 1 and 3 only

(d) 1, 2 and 3

So, you left ancient history as it was too much to cover and UPSCasked you some in depth question from it. You thought of skipping

it. But for a moment just read statement 1 – The roads and river-

routes were completely immune from robbery. COMPLETELY

IMMUNE ? Again is that possible? As an UPSC aspirant you need to

avoid extrmities, so things like completely, fully, all does not hold



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good for you. Even the most peaceful countries of Europe does not

have anything like completely immune from crime places. So this is

incorrect, eliminate statement 1 and get your answer.

3. Calculated guess

This is just a further step of technique 1 and 2. Many time you

won’t be able to eliminate 3 options, but only 2. You may then need

to put a calculated guess.

For instance, consider this from UPSC 2012 prelims

What are the reasons for the people’s resistance to the introduction

of BT brinjal in India?

1. BT brinjal has been created by inserting a gene from a soil fungus

into its genome.

2. the seeds of BT brinjal are terminator seeds and therefore, the

farmers have to buy the

seeds before every season from the seed companies.3. there is an apprehension that the consumption of BT brinjal may

have adverse impact on health.

4. there is some concern that the introduction of BT brinjal may

have adverse effect on the biodiversity.

Select the correct answer using the codes given below:



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a) 1, 2 and 3 only

b) 2 and 3 only

c) 3 and 4 only

d) 1,2,3 and 4

BT is related with bacteria and must be known to you. So you can

eliminate statement 1. But still you have two options left. C hasmore chances of being correct as you might have read about GM

crops causing loss to biodiversity. So, as you can see, you did not

get exact answer, but you came closer. You now only had two

options, and can go on to take a calculated guess.

Let’s take another example. This is from UPSC 2013 prelims.

With reference to the usefulness of the by-products of sugarindustry, which of the following statements is / are correct?

1.Bagasse can be used as biomass fuel for the generation of

energy.

2. Molasses can be used as one of the feedstocks for the production

of synthetic chemical fertilizers.

3. Molasses can be used for the production of ethanol.Select the correct answer using the codes given below.

a) 1 only

b) 2 and 3 only

c) 1 and 3 only

d) 1, 2 and 3



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Now you may not have much information about these, but you can

sense that it’s related to biofuels and organic products. So, from

where would synthetic fertilizer crop up here in statement 2.

Therefore, statement 2 is false that is certain. This eliminates two

options. You can then take a guess and your knowledge will tell you

to guess for c) 1 and 3 which is the correct answer.

Another one

With reference to ‘stem cells’, frequently in the news which of the

following statements is/are correct?

1. Stem cells can be derived from mammals only.

2. Stem cells can be used for screening new drugs.

3. Stem cells can be used for medical therapies.Select the correct answer using the codes given below:

a) 1 and 2

b) 2 and 3 only

c) 3 only

d) 1, 2 and 3

Again following the technique of avoiding extremities, you caneliminate statement 1- Stem cells can be derived from mammals

only. Still you have two options left and can put up a guess. Most

people will mark b and that is the correct answer.

Now, after knowing all these techniques, can you answer the

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following question from our GS Prelims Mock Test Series 2015 –

Moderator is used in which of the following type of nuclear

reactor?

1. Pressurized water reactor

2. Fast breeder reactor

3. Boiling water reactor4. Heavy water reactor

Select the correct answer using the codes given below.

a) 1, 2 and 3 only

b) 1 ,3 and 4 only

c) 2 ,3 and 4 only

d) 1 ,2, and 4 only

All you needed to know was that fast breeder reactors are called

fast because they do not used slowed down neutrons. So no

moderator there. Even if you had no knowledge about other types

of reactor, you can still answer this by using the techniques

described above

Caution

However, you need to be careful and please do not depend overtly

and exclusively on these techniques. This is to be used only as a



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supplement and not as the main tool to answer questions. Read

more, broaden your knowledge base, develop conceptual clarity as

much as you can. These techniques will then become more and more

useful.

The main point of this post was to give you hope that even though

the syllabus seems huge, you can cover it by just covering the basicaspects, developing conceptual clarity and then using

few techniques like these.

However, as I said, beware of it’s drawbacks and do not over use it.

Your first choice for answering the questions should be knowledge

and not these techniques. Take this question from our GS PrelimsMock test Series 2015 and see how this technique fails totally –

With reference to stem cells, consider the following statements:

1. Stem cells are found only in multi-cellular organism.

2. Placenta is a rich source of stem cell.

Which of the statements given above is/are correct?

a) 1 onlyb) 2 only

c) Both 1 and 2

d) Neither 1 nor 2

You may eliminate statement 1 because of the word only and since

you may be avoiding extremities, but the fact is that statement 1 is



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correct.

As I always say, there are no shortcuts. You need to work regularly

and work hard enough. However, things are not as difficult as it

may seem. Syllabus is not as huge as it may appear. Questions are

not as tough as they may seem at first reading. Just combine your

hard work of gathering knowledge with some smart techniques

given above, and you will easily sail through prelims.

Please read these two important articles about UPSC prelims

preparation –

1. How UPSC asks current affairs in GS Prelims

2. How to practice prelims MCQs for UPSC

Self Study IAS’s GS Prelims Mock Test Series 2015 ( 10 full length

mock tests @ RS 500 only). For details, click HERE.

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This entry was posted on May 25, 2015

11 Comments

• •

IAmRC1 •

This post gave me a good feeling just before the JUDGEMENT DAY

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• •

Chetan •

Really Awesome...U have just bowled me ;)

• •

Upendra Singh •

maza aa gayo

• •

drt •

nice

• •

Neeraj Yadav •

fantasting ...amazing ....nyc work ..overwhelmed by ur work ...

• •

Dc •

superb article...although i am using some of the above techniques already.

thanks :)

• •

Chandan kr Roy •

HEY MAN , U R GETTING INTO MY NERVES NOW.

REALLY BRILLIANT WALKTHROUGH. I MUST TRY THIS. AS YOU SAID

GOOD WITH THE 2ND POINT OF EXTREMES.

.

THANKYOU

BTW YOUR TEST PAPERS ARE GOOD. HOPE TO SEE THE MAINTAIN

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Protected: Mock Test 6 : Discussion

•

— A - 88 C - 44 M - 58

Prelims MCQs

•

Solved : UPSC CSE Prelims 2015 General Studies

Paper – Part 3

•

— When economy has slower growth rate(i.e

production slows down =less tax collection) …

Prelims MCQs

Laxmikanth)

•

true that All

SELFSTUDYIAS

• •

Seeker •

thank u so much!! !

• •

Sri charan Das Goswami •

Really smart article..........:)

• •

Rajesh •

Great one.

• •

Jimboomba •

Superb Article

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