# Idb invest Interview Questions Answers, HR Interview Questions, Idb invest Aptitude Test Questions, Idb invest Campus Placements Exam Questions

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Ques:- There is a leak in the bottom of a cistern. When the cisternis thoroughly repaired, it would be filled in 3 ? hours. It now takes half an hour longer. If the cistern is full, howlong will the leak take to empty the cistern?
A. 24 hours
B. 28 hours
C. 21 hours
D. 27 hours
E. None of these

Time taken to fill repaired cistern = 12 mins

In 1 min, pipe will fill = 1/12

Time taken to fill cistern with leak = 12 + 18 = 30 mins

In 1 min, it will fill = 1/30

Consider the leak as an outlet pipe, so

1/30 = 1/12 – [ in 1 min how much the outlet pipe leaks ]

= 1/12 – 1/30

= 5/60 – 2/60 = 3/60 = 1/20

Therefore, it will take 20 mins for the leak to empty the cistern

Ques:- In a square , all the mid points are joined. the inner square is shaded. If the area of the square is A, what is the shaded area?

ans: A/2
u get a diamond shape when u join those mid points
and u can form 2 square
when u analyse the squares u will get the answer

Ques:- T, U, V are 3 friends digging groups in fields. If T & U can complete i groove in 4 days &, U & V can complete 1 groove in 3 days & V & T can complete in 2 days. Find how many days each takes to complete 1 groove individually.
Ques:- Old Man Wrinkle Man Wrinkle spent 1/4th of his life as a boy, 1/8th as a youth, and 1/2 as an active man. If Man Wrinkle spent 8 years as an old man, then how many years did he spend as an active man?

32
Solution:

life as a boy = 1/4
life as a youth = 1/8
life as an active man = 1/2
sum of life as boy, youth and active man = 1/4 + 1/8 + 1/2 = 7/8
life as an old man = 1 − 7/8 = 1/8
1/8 Wrinkle’s life (as an old man) is 8 years.
and 1/2 = 1/8 *4
So, 1/2 Wrinkle’s Age (as active man) = 8*4 = 32years.

Ques:- How many lines can be drawn in a 2D plane such that they are equidistant from 3 non-collinear points ?
Ques:- Why might you be successful in such a job?
Ques:- Why were you fired from last organisation?
Ques:- Regarding family background
Ques:- Evrybody says to be truthful during the full ssb period .when asked to give one`s negative qualities should we betruthful here too ?
Ques:- There are 6 red shoes & 4 green shoes . If two of red shoes are drawn what is the probability of getting red shoes

5/9

Ques:- How to introduce ourselves
Ques:- How would you describe yourself as a person?
Ques:- Whats your name and why you join this company?
Ques:- Why do you want leave teaching job and come to bpo sector?
Ques:- Analyse the first Law of Thermodynamics?
Ques:- A boat takes 90 minutes less to travel 36 miles downstream than to travel the same distance upstream. If the speed of the boat in still water is 10 mph, the speed of the stream is:

Let speed of stream be v mph
Then,
36/(10-v) = 1.5hr + 36/(10+v)
On solving, we get speed of stream as v = 2mph.

Ques:- The average marks in mathematics scored by the pupils of a school at the public examination were 39. If four of these pupils who actually scored 5, 12, 15 and 19 marks at the examination had not been sent up, the average marks for the school would have been 44. Find the number of pupils sent up for examination from the school?
Ques:- The ratio of the present age of two brothers is 1:2 and 5 years back, the ratio was 1:3. What will be the ratio of their ages after 5 years?
Ques:- Find the smallest number which when divided by 13 and 16 leaves respective remainders of 2 and 5.