BoB Office Assistant flashcards

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

Syllogism: All A are B

If all A are B and all B are C, then all A are C. If some A are B and all B are C, then some A are C. 'No A is B' plus 'All B are C' yields 'Some C are not A'.

Blood relation: paternal uncle

The brother of one's father is the paternal uncle. The brother of one's mother is the maternal uncle. The father's sister is the paternal aunt.

Direction: right turn

A right turn rotates the facing direction 90° clockwise. A left turn rotates 90° anticlockwise. Two consecutive right turns reverse the original direction.

Order and ranking formula

If a person is Lth from the left and Rth from the right in a row, total persons = L + R − 1. If two persons are on opposite sides with k persons between them, total = L + k + R.

Coding-decoding: reverse alphabet

In reverse alphabet coding, A becomes Z, B becomes Y, and so on. The position of a letter in reverse order equals 27 minus its normal position (A=1 → 26).

Circular arrangement facing centre

When people face the centre of a circle, a person's left is clockwise and right is anticlockwise. When they face outside, left is anticlockwise and right is clockwise.

Inequality: transitive rule

From A > B and B ≥ C, conclude A > C. From A ≥ B and B = C, conclude A ≥ C. Only relations pointing in the same direction can be combined.

Statement and assumption

An assumption is something unstated but necessary for the statement to be valid. A restatement of the statement or an unrelated claim is not an assumption.

Successive percentage change

Net change after successive changes of a% and b% is a + b + ab/100. An increase of x% followed by a decrease of x% always gives a net decrease of x²/100 percent.

Simple interest formula

Simple interest SI = P × R × T / 100, where P is principal, R is annual rate percent, and T is time in years. Amount = P + SI.

Compound interest: 2 years

CI for 2 years = P[(1 + R/100)² − 1]. The difference between CI and SI for 2 years is P(R/100)².

Profit and loss percentage

Profit% = (SP − CP)/CP × 100. Loss% = (CP − SP)/CP × 100. If two items are sold at the same price with +x% and −x% profit/loss, net loss% = x²/100.

Average speed equal distances

If a journey covers equal distances at speeds x and y, average speed = 2xy/(x + y). This is the harmonic mean, not the arithmetic mean.

Boats and streams

Downstream speed = boat speed + stream speed. Upstream speed = boat speed − stream speed. Boat speed = (down + up)/2; stream speed = (down − up)/2.

Ratio division formula

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

Permutation and combination

nPr = n!/(n−r)! gives arrangements; nCr = n!/[r!(n−r)!] gives selections. For a circle of n distinct items, arrangements = (n−1)!.

Mensuration: circle and cylinder

Circle area = πr²; circumference = 2πr. Cylinder volume = πr²h; curved surface area = 2πrh. Sphere volume = (4/3)πr³.

Subject-verb agreement: one of

In 'one of + plural noun + verb', the verb agrees with 'one' and is singular: 'One of the students is absent.' 'Each', 'every', 'either', and 'neither' also take singular verbs.

Present perfect vs simple past

Use present perfect (has/have + past participle) for past actions with present relevance and no definite past time. Use simple past with definite past markers like yesterday or last year.

Articles: a vs an

Use 'a' before a consonant sound (a university, a one-rupee coin) and 'an' before a vowel sound (an hour, an MBA). The choice depends on sound, not spelling.

Prepositions: since and for

'Since' is used with a point of time (since 2010, since Monday). 'For' is used with a duration (for three years, for two hours).

Active to passive voice

The object becomes the subject; the verb becomes a form of 'be' + past participle; the original subject moves to a 'by' phrase or is omitted if unknown.

Direct to indirect speech

Change present tense to past, 'today' to 'that day', 'tomorrow' to 'the next day', 'here' to 'there'. For yes-no questions, use 'if' or 'whether'.

Idiom: piece of cake

'A piece of cake' means something very easy to do. Similar idioms: 'a cakewalk' and 'child's play'.

Idiom: once in a blue moon

'Once in a blue moon' means very rarely or almost never. It describes an event that happens infrequently.

Cloze test strategy

Read the whole passage first, then choose the option that fits grammar (collocation, preposition) and meaning. Eliminate options that are grammatically possible but contextually wrong.

RBI establishment

The Reserve Bank of India was established on 1 April 1935 under the RBI Act, 1934. It was nationalised on 1 January 1949. Headquarters: Mumbai.

Repo rate

The repo rate is the rate at which the RBI lends short-term funds to commercial banks against government securities. The reverse repo rate is the rate at which RBI absorbs liquidity from banks.

CRR and SLR

CRR (Cash Reserve Ratio) is the share of net demand and time liabilities that banks must keep as cash with RBI. SLR is the share kept in approved securities with themselves.

Priority sector lending target

Domestic commercial banks must lend 40% of adjusted net bank credit to priority sectors, including 18% to agriculture and 7.5% to micro enterprises.

Pradhan Mantri Jan Dhan Yojana

PMJDY was launched on 28 August 2014 to promote financial inclusion by providing basic savings bank accounts, RuPay cards, and overdraft facilities to unbanked households.

Cheque validity period

A cheque is valid for three months from the date written on it. After that, it becomes stale and is not honoured by the bank.