AIIMS CRE flashcards

32 cards. Read the term and the definition here. The deck at the top of this page is optional.

Letter position opposite

In the English alphabet, letters at positions that sum to 27 are opposites: A(1) and Z(26), B(2) and Y(25), and so on up to M(13) and N(14).

Syllogism validity rule

A conclusion is valid in syllogism only if it is true in every possible Venn diagram that satisfies the given premises; a single counter-diagram invalidates it.

Direction sense net displacement

For a series of right-angle turns, the net displacement is the straight-line distance from start to end, computed using Pythagoras on the total north-south and east-west components.

Circular seating left-right

In circular seating, if people face the centre, a person's left is clockwise; if they face outward, left is anticlockwise. Always fix one anchor before placing others.

Blood relation notation

Use '+' for male and '−' for female; a horizontal line joins siblings, a vertical line joins parent to child. Draw the tree before answering the question.

Coding-decoding shift check

For letter-shift codes, compute the numeric shift for each letter. If shifts vary, test whether the shift equals the letter's position in the word or another positional rule.

Analogy relationship direction

In analogy questions, identify the exact relationship (cause-effect, part-whole, worker-tool, degree) and ensure the chosen pair preserves both the relationship type and its direction.

Number series first check

Before assuming a complex rule for a number series, check first and second differences, ratios, alternating patterns, squares, cubes, and prime sequences in that order.

Fundamental Rights location

Fundamental Rights are in Part III of the Indian Constitution, Articles 12 to 35. Directive Principles are in Part IV (Articles 36–51), and Fundamental Duties in Article 51A.

Constitution adoption dates

The Indian Constitution was adopted on 26 November 1949 and came into force on 26 January 1950. Dr B.R. Ambedkar chaired the Drafting Committee.

RBI establishment

The Reserve Bank of India was established on 1 April 1935 under the RBI Act, 1934, and was nationalised in 1949. Its Monetary Policy Committee has six members.

Chandrayaan-3 landing

ISRO's Chandrayaan-3 landed near the lunar south pole on 23 August 2023. Aditya-L1, India's first solar observatory, was launched on 2 September 2023.

Lok Sabha maximum strength

The Lok Sabha's maximum strength is 552: up to 530 from states, 20 from union territories, and 2 Anglo-Indians nominated; the Anglo-Indian nomination lapsed in 2020.

GDP expenditure formula

GDP = C + I + G + (X − M), where C is consumption, I is investment, G is government spending, X is exports, and M is imports. Net exports can be negative.

National Science Day

National Science Day is observed on 28 February in India, commemorating the discovery of the Raman effect by C.V. Raman. National Technology Day is 11 May.

Fiscal deficit definition

Fiscal deficit equals total expenditure minus total receipts excluding borrowings. It measures how much the government must borrow to meet its spending needs.

Successive percentage change

Two successive changes of a% and b% give a net change of a + b + ab/100. A 20% increase followed by a 10% decrease yields a net 8% increase.

Profit percentage formula

Profit% = (profit / cost price) × 100. Selling price = cost price × (100 + profit%) / 100. Discount% is always calculated on the marked price, not the cost price.

CI minus SI two years

For two years at rate R, compound interest minus simple interest equals P × (R/100)². This shortcut avoids computing both interests in full.

km/h to m/s

To convert kilometres per hour to metres per second, multiply by 5/18. To convert m/s to km/h, multiply by 18/5. A train crossing a platform covers train plus platform length.

Average scaling rule

If every value in a data set is increased by k, the average increases by k. If every value is multiplied by k, the average is multiplied by k.

Combination formula

nCr = n! / [r!(n − r)!], giving the number of ways to choose r items from n without regard to order. nC0 = nCn = 1 and nCr = nC(n − r).

Sphere volume

The volume of a sphere is (4/3)πr³, and its surface area is 4πr². For a cylinder, volume is πr²h and curved surface area is 2πrh.

Ratio division rule

To divide an amount N in the ratio a:b:c, the shares are N × a/(a+b+c), N × b/(a+b+c), and N × c/(a+b+c). The sum of shares equals N.

Subject-verb agreement compound

A compound subject joined by 'and' takes a plural verb, unless the two nouns form a single idea, as in 'bread and butter is my breakfast'.

Article a versus an

Use 'a' before a consonant sound and 'an' before a vowel sound. Say 'an hour' and 'an MBA' but 'a university' and 'a European', based on sound, not spelling.

Prepositions in on at

Use 'in' for months, years, and seasons; 'on' for days and dates; 'at' for clock times and fixed points such as at noon and at night.

Present perfect tense use

The present perfect (has/have + past participle) describes a past action with present relevance. The past perfect (had + past participle) marks the earlier of two past actions.

Passive voice conversion

To convert active to passive, move the object to subject position, use the correct form of 'be' plus past participle, and add 'by' plus the agent when relevant.

One of the verb rule

'One of the' is followed by a plural noun but takes a singular verb, as in 'One of the boys is here'. Similarly, 'each', 'every', 'either', and 'neither' are singular.

Context clue contrast

Contrast words such as 'but', 'although', and 'however' signal that the meaning of an unfamiliar word is opposite to a nearby idea, helping infer synonyms and antonyms.

Reading comprehension main idea

The main idea is the central point the passage supports throughout, not a single detail. Tone and purpose questions require evidence from the passage, not outside knowledge.