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Image by Getty Images via @daylifeWipro Type Time & Work ProblemsTime & Work is a favourite area considering placement test of any big company like Wipro. You can always expect few questions from time and work section. Though tagged as wipro sample paper, one can expect these kinds of questions in other papers as well.
Question 1
Consider three people A,B and C. Let A and B can finish a job in 21 days, B and C in 14 days and A and C in 28 days. Who will take the least time when working independently ?
Options : 1) A 2) B 3) C 4) Can't be determined
Answer 1
Correct answer is B
Consider WA, WB and WC be the work done per day by A,B and C respectively. Then
WA + WB = 1/21 -- eq 1
WB + WC = 1/14 -- eq 2
WA + WC = 1/28 -- eq 3
Eq 2 - Eq 3 will give
WB - WA = 1/14 - 1/28 = 1/28 -- eq 4
Eq 1 + Eq 4 will give
2WB = 1/21 + 1/28 = 7/84
WB = 7/168
Sub value of WB in eq 1, we get
WA = 1/21 - 7/168 = 1/168.
Sub value of WA in eq 3, we get
wc = 1/28 - WA = 1/28 - 1/168 = 5/168
Since WB (work done by B per day) is greater when compared to WA and WB clearly B will be able to the maximum work on any given day and hence he should consume least amount of time when working independently.
Question 2
Consider two postmen A and B respectively. A is young and can deliver 20 parcels in 3 hours while B is older than A and can deliver only 15 parcels in 4 hours. If the total number of parcels to deliver is 60, how long they will take working together.
a. 121/12 hours b. 144/36 hours c. 144/25 hours d. 121/25 hours
Answer 2
Correct ans is option c. 144/25 hours.
A can deliver 20 parcels in 3 hours. Hence for 1 hour he can deliver 20/3 parcels.
B can deliver 15 parcel in 4 hours. Hence for 1 hour B needs 15/4 parcels.
When A and B work together, for 1 hour they can deliver, 20/3 + 15/4 parcles = 80 + 45 /12 = 125/12 parcels.
Hence to deliver 60 parcels they would require : 60 X 12/125 = 720/125 = 144/25 hours
Question 3
Consider a courier company A which can deliver 100 parcels in 5 days with 5 men working for 8 hours a day. Consider another courier company B where every employee is equally effecient as that of company B. Company B is short of one man when compared to A and has a policy of asking its workers to work only for 6 hours a day. How long (in days) company B will take to deliver 100 parcels.
Options : a. 8.3 b. 24 c. 12 d 6.6
Answer
Correct answer is a. 8.3 days
Total amount of work W = N x D X W
where N = number of men, D = number of days, W = amount of work per day
Applying the above formula for company A we get,
Work done by company A to deliver 100 parcels = 5 X 5 X 8 = 200 -- eq 1
Work done by company B to deliver 100 parcels = 4 X D x 6 = 24D -- eq 2
Since the work to be done is same in both the cases, eq 1 = eq2
or 200 = 24D or D = 8.3
4 Sample TCS Sentence Completion Questions
Dear Reader, sentence completion questions are the ones asking you to find contextually correct words (synonyms) to fill the given blanks. These types of placement questions can be expected on papers of several companies including TCS. Hence it is very essential to develop your vocabulary and the ability to pick the correct word in context.
Question 1
Value of currency started increasing which ultimately kick started __ (a. deflation / b. depreciation / c. disinflation) in economy.
Answer : a. deflation
Reason :Deflation is the term used to denote a fall in prices of goods indicating currency value rise. Though disinflation could appear close in context, it actually means a slow rise in inflation rather than an exact opposite of inflation.
Question 2
The introduction of number zero to mathematics is considered to be one of the greatest __ (a. innovations / b. inventions / c. discoveries) of all times.
Answer: a. innovations
Reason : Innovation means a change that could be considered to have brought a great positive change in some field. Hence innovation fits the context well. However, invention means to invent something new and discovery means to find something unknown.
Question 3
__ (a. incentives / b. bonuses /c. gifts) generally motivate people to carry out tasks in an efficient manner.
Answer: a. Incentives
Reason : Incentive means a motivating factor that encourages people to carry out their tasks efficiently. Though bonuses and gifts closely suit the context, they generally mean only monetary benefits whereas incentive can mean even non monetary benefits like appreciation.
Question 4
___ (a. Idiom / b. Connotation /c. Paradox) refers to words implying different meaning than the actual literal meaning.
Answer : b. Connotation
Reason : Connotation is where words actually mean something but their implied meaning would be different. For example think of the words 'warm reception'.
Wipro Type Conceptual Interview Questions
Dear Reader, in Wipro technical interviews, you may not only expect questions from facts but also you can expect questions asking you to explain the concepts. Below are 3 sample technical interview questions that can be used by you to prepare for Wipro and other similar interviews.
Question 1
In software applications, especially in JAVA based applications, how design patterns help after a problem/requirement is identified ?
Answer 1
Design pattern can be treated as a way or template to solve a problem depending upon the nature of the problem/requirement. Though they themselves cannot solve a problem, they provide greater insights into the best possible ways to solve them.
Question 2
Say two programs essentially dealing with solving same problem through similar algorithms. Let A be written using pointers and B be written using arrays. Which one will be memory efficient and which will be more readable.
Answer 2
A will be more memory efficient than B and B will be more readable than A. Reason : generally pointers are more memory efficient when used by an experienced programmer. And arrays are generally easily readable and can be easily understood by even beginner level programmer.
Question 3
What is the integrity constraint in SQL which when used ensures that values in a column of a table have a corresponding member on another column of another table.
Answer 3
Foreign Key is the answer (self explanatory as the question itself has got the explanation)
TCS Type 3 Facts & Concepts Interview Questions
You could expect questions on TCS interviews asking you to pick and explain a right answer based on the choices presented before you. These types of questions are not only limited to TCS but can be expected on several other companies placements/interviews as well.
Question 1
Which of the C variable qualifiers amongst const and Volatile provides more data safety ? Explain the reason.
Answer 1
const is the qualifier that provides more data security by throwing error when an accidental attempt is made to modify the same.
Question 2
Which is more memory efficient in generic sense - Arrays or Linked Lists ?
Answer 2
Actually, there is no significant difference in memory requirement for arrays and linked lists as both increase with increase in data. (However, linked lists are generally easier to work with dynamic data)
Question 3
Among function declaration and function definition which of the following gives first hand information to the compiler about its return data type and arguments.
Answer 3
Function declaration is the answer, as it precedes function definition. With function declaration, the compiler can get to know about its return data type, the number and type of the arguments etc.
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