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Q:

An error 2% in excess is made while measuring the side of a square. The percentage of error in the calculated area of the square is:

A) 1.04	B) 2.04
C) 3.04	D) 4.04

Answer & Explanation Answer: D) 4.04

Explanation:

100 cm is read as 102 cm.

A1 = (100*100)Sq.cm

A2 = (102*102)Sq.cm

(A2 - A1) = $102^{2} - 100^{2}$ = (102 + 100) x (102 - 100) = 404 sq.cm.

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Filed Under: Area
Exam Prep: Bank Exams
Job Role: Bank PO

Q:

The ratio between the length and the breadth of a rectangular park is 3 : 2. If a man cycling along the boundary of the park at the speed of 12 km/hr completes one round in 8 minutes, then the area of the park (in sq. m) is:

A) 153600	B) 143600
C) 13600	D) 16300

Answer & Explanation Answer: A) 153600

Explanation:

Let length = 3x metres and breadth = 2x metres.

Then, 2(3x + 2x) = 1600 or x = 160.

Length = 480 m and Breadth = 320 m.Area = (480 x 320) sq.m = 153600 sq.m

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Filed Under: Area
Exam Prep: Bank Exams
Job Role: Bank PO

Q:

In how many ways can you choose one or more of 12 different candies?

A) 4054	B) 4050
C) 4095	D) 4059

Answer & Explanation Answer: C) 4095

Explanation:

Each candy can be dealt with in two ways.It can be chosen or not chosen.This will give 2 possibilites for the first candy, 2 for the second, and so on.by multiplying the cases together we get $2^{12}$ . Since the case of no candy being selected is not an option, we have to subtract 1 from our answer.

Therefore,there are $2^{12}$ - 1 = 4095 ways of selecting one or more candies

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Filed Under: Permutations and Combinations

Q:

If there are 15 dots on a circle,how many triangles can be formed?

A) 455	B) 450
C) 469	D) 500

Answer & Explanation Answer: A) 455

Explanation:

There are 15 dots in total,and to make a triangle we need to select any three of those dots.

So, $15 C_{3}$ = 455

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Filed Under: Permutations and Combinations

Q:

If each of the 8 teams in a league must play each other three times,how many games will be played?

A) 72	B) 84
C) 36	D) 79

Answer & Explanation Answer: B) 84

Explanation:

Since,each member of the league must meet every other member of the league.If they only played each other once,there would be $8 C_{2}$ games.Since,each pairing of teams will occur three times,the answer will be triple.

Therfore, $8 C_{2} * 3$ =84

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Filed Under: Permutations and Combinations

Q:

A polygon 7 sides.How many diagonals can be formed?

A) 14	B) 7
C) 15	D) 21

Answer & Explanation Answer: A) 14

Explanation:

$7 C_{2}$ - 7 = 14

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Filed Under: Permutations and Combinations

Q:

12 people at a party shake hands once with everyone else in the room.How many handshakes took place?

A) 72	B) 66
C) 76	D) 64

Answer & Explanation Answer: B) 66

Explanation:

There are 12 people, so this is our n value.

So, $12 C_{2}$ 1= 66

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Filed Under: Permutations and Combinations

Q:

Default read write and execute permissions given to a file for owner, group and others are

A) 6-4-4	B) 6-4-2
C) 6-4-6	D) 6-6-6

Answer & Explanation Answer: A) 6-4-4

Explanation:

Default permissions given to a file are:

Owner - read write and execute - 6

group - write - 4

others - write - 4

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Filed Under: Operating Systems
Job Role: Database Administration

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