Placement Preparation

What will be the output of the following code snippet?

• 648

• 8

• 72

• None of the above

Answer explanation

The macros are first written out exactly as labeled before the value of the expression is calculated. So the expression evaluates to (216 / 3) * 3 * 3 = 648.

Window is to pane as book is to

• novel

• glass

• cover

• page

Answer explanation

A window is made up of panes, and a book is made up of pages. The answer is not (choice a) because a novel is a type of book. The answer is not (choice b) because glass has no relationship to a book. (Choice c) is incorrect because a cover is only one part of a book; a book is not made up of covers.

Which of the following sorting algorithms provide the best time complexity in the worst-case scenario?

• Quick sort

• Bubble sort

• Merge sort

• Selection

Answer explanation

Merge Sort will always have a time complexity of O(n * logn) which is the best in the worst case among these algorithms.

Is mutual exclusion required for shareable resources?

• Yes

• No

• May be

Look at this series: 80, 10, 70, 15, 60, ... What number should come next?

• 20

• 25

• 30

• 50

Answer explanation

This is an alternating addition and subtraction series. In the first pattern, 10 is subtracted from each number to arrive at the next. In the second, 5 is added to each number to arrive at the next.

Statement: Should we scrap the system of formal education beyond graduation?

Arguments:

I. Yes. It will mean taking employment at an early date.

II. No. It will mean lack of depth of knowledge.

• Only argument I is strong

• Only argument II is strong

• Either I or II is strong

• Neither I nor II is strong

• Both I and II are strong

Answer explanation

Clearly, argument I is vague because at present too, many fields are open to all after graduation. However, eliminating the post-graduate courses would abolish higher and specialized studies which lead to understanding things better and deeply. So, argument II is valid.

In what ratio must water be mixed with milk to gain 16 2/3% on selling the mixture at cost price?

• 1:6

• 6:1

• 2:3

• 4:3

Answer explanation

From a pack of 52 cards, two cards are drawn together at random. What is the probability of both the cards being kings?

• 1/15

• 25/57

• 35/256

• 1/221

Answer explanation

Let S be the sample space.

Then, n(S) = ⁵²C₂ =(52 x 51)/(2 x 1)= 1326.

Let E = event of getting 2 kings out of 4.

n(E) = ⁴C₂ =(4 x 3)/(2 x 1)= 6.

P(E) =n(E)/n(S)=6/1326=1/221.

What is the length of the IPv4 address?

• 8 bits

• 16 bits

• 32 bits

• 128 bits

Which of the following normal forms contains information about a single entity?

• 1NF

• 2NF

• 3NF

• 4NF

Answer explanation

The 4NF contains information about single entity. For each non-trivial multivalued dependencies X->Y, X is a superkey.