Perftech Interview Questions, Process, and Tips

Ques:- What location would you prefer?
Ques:- Let S be the set of prime numbers greater than or equal to 2 and less than 100. Multiply all the elements of S. With how many consecutive zeros will the product end?
A. 1
B. 4
C. 5
D. 10
Recent Answer : Added by Yash G On 2023-03-01 17:24:09:

To determine how many consecutive zeros the product of S will end with, we need to find the highest power of 10 that divides the product. This is equivalent to finding the highest power of 5 that divides the product, since the number of factors of 2 will always be greater than the number of factors of 5.

The primes in S are {2, 3, 5, 7, 11, 13, 17, 19, 23, 29, 31, 37, 41, 43, 47, 53, 59, 61, 67, 71, 73, 79, 83, 89, 97}.

There are 24 primes in S, so the product of S is:

2 x 3 x 5 x 7 x 11 x 13 x 17 x 19 x 23 x 29 x 31 x 37 x 41 x 43 x 47 x 53 x 59 x 61 x 67 x 71 x 73 x 79 x 83 x 89 x 97

We need to find the highest power of 5 that divides this product. To do this, we count the number of factors of 5 in the prime factorization of each number in S.

5 appears once: 5
5 appears once: 25
5 appears once: 35
5 appears once: 55
5 appears once: 65
5 appears once: 85
So, there are six factors of 5 in the product of S. However, we also need to consider the powers of 5 that arise from the factors 25, 35, 55, and 65.

25 = 5 x 5 appears once: 25
35 = 5 x 7 appears once: 35
55 = 5 x 11 appears once: 55
65 = 5 x 13 appears once: 65
Each of these numbers contributes an additional factor of 5 to the product of S. Therefore, there are 6 + 4 = 10 factors of 5 in the product of S.

Since each factor of 5 corresponds to a factor of 10, we know that the product of S will end with 10 zeros. Therefore, the product of S will end with 10 consecutive zeros

Ques:- Do u know how to speak English with American accent?
Ques:- How you wil manage dealer network?
Ques:- Tell me about yorself?
Ques:- On a scale of one to ten, rate me as an interviewer?
Ques:- Why do you want to work in Night shift?
Ques:- Tell me about a time when you had to lead a team?
Ques:- You are given weights of order 1kg 3kg 9kg 27kg 81kg and so on…(powers of 3)A weight of N kg is placed on any one of the empty pans of the balance.You are supposed to add weights to both pans of the balance and make them equal.You can use one weight only once..i.e., you can't use 2 number of 3kg weights.
Ques:- A and B combinely can do a work in 4 days. If A alone can do a piece of work 6 days. In how many days B alone can do?
Recent Answer : Added by Admin On 2020-05-17 12:03:23:

say the work is w and let no of days taken by b is ‘x’ which
we have to calculate
so work done by a in one day is w/6
work done by b in one day is w/x
a and b together can do work in 4 days ie=(w/6)+(w/x)=(w/4)
solving equation x=12
so no of days taken by b=12

Ques:- There are 4 people in a closed room and you are waiting outside to enter into the room. You can enter only when one of them opens the door. The probability that somebody will open the door is 1/2. Now what is the probability that the door will be opened so that you can go inside?
Recent Answer : Added by Ashwin GB On 2021-07-08 16:28:54:

The probability that no one opens the door would be
0.5×0.5×0.5×0.5= 0.0625
So, the probability that atleast one opens the door is 1-0.0625= 0.9375

Ques:- Insert the missing number:
2, 4, 12, 48, 240, (…..)
A. 1920
B. 1440
C. 1080
D. 960
Recent Answer : Added by Shaik Mohammad Javeed On 2021-11-18 17:15:42:

C)1440
2*2=4
4*3=12
12*4=48
48*5=240
240*6=1440

Ques:- In what ratio should a variety of rice costing Rs. 6 per kg be mixed with another variety of rice costing Rs. 8.75 per kg to obtain a mixture costing Rs. 7.50 per kg?
Ques:- Do you have or know someone with pain?
Ques:- What was your toughest decision in your life?
Recent Answer : Added by DK BOSS On 2021-07-21 15:26:22:

choosing my career path

Ques:- Tell me about television?
Ques:- Money and work both are like siblings. But I believe when you work hard; money will flow to you. So work is more important than money. Only hard work can help you put another feather in your success cap.
Ques:- Perimeter of front wheel =30, back wheel = 20. If front wheel revolves 240 times. Howm many revolutions will the back wheel take?
Recent Answer : Added by Admin On 2020-05-17 11:59:16:

360 times

Ques:- In a class there are 20 boys and 25 girls. In how many ways can a boy and a girl be selected?
Recent Answer : Added by Rashid Ather Deshmukh On 2021-10-07 15:42:01:

500 ways

Ques:- If in certain language KINDLY is coded as ELDNIK, how is EXOTIC coded in that code ?
Recent Answer : Added by Atif On 2022-12-05 16:13:40:

CITOXE

Ques:- 1000 men have provisions for 15 days. If 200 more men join them, for how many days will the provisions last now?
Recent Answer : Added by Robert Blackwell On 2022-09-02 17:04:29:

That will depend heavily on when in the journey the 200 men join.

Ques:- What is the company you are going to work for in USA?
Ques:- A contribution of Rs. 500 was raised from 500 people. The fee was as follows: Men: Rs.3.00 each Women: Rs. 2.00 each Children: 0.48 each. If number of women is more than number of men, how many children are there?
Ques:- Find the odd man out:
8, 27, 64, 100, 125, 216, 343
A. 343
B. 125
C. 100
D. 27
Recent Answer : Added by aisha On 2022-08-24 17:03:40:

100

Ques:- The average of 35 numbers is 25. If each number is multiplied by 5, find the new average?
Recent Answer : Added by MAMIDI LIJITA SREE On 2023-01-21 17:36:37:

30

Ques:- A person bought an article and sold it at a loss of 10%. If he had bought it for 20% less and sold it for Rs.75 less, he could have gained 25%. What is the cost price?
Ques:- The difference of two consecutive even numbers squares is 84, then what is the sum of these numbers?
Recent Answer : Added by shivaprasad On 2021-10-12 12:52:39:

(x+2)^2 -x^2 = 84
X=20
So (20,22)
Sum= 42

Ques:- Suresh is taller than Prabhu but shorter than Ram, Prabhu is as tall as Neeraj but taller than Nilesh. Which of the following statements is definitely true for Neeraj? (a) Neeraj is shorter than Nilesh (b) Neeraj is the tallest (c) Neeraj is the shortest (d) Neeraj is taller than Nilesh (e) None of these
Recent Answer : Added by Admin On 2020-05-17 12:03:38:

( d ) Neeraj is taller than Nilesh

Ques:- Pushpa is twice as old as Rita was 2 years ago. If the difference of their ages be 2 years, how old is Pushpa today?
A. 6 years
B. 7 years
C. 8 years
D. 10 years
Recent Answer : Added by reshma On 2022-10-17 15:57:40:

6 yeara old

Ques:- Iam a fresher. I completed B.TECH in June 2008. what have u been doing after june 2008?

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Devendra Bhardwaj With a decade of experience as a Job Hiring Expert, I am a results-driven professional dedicated to elevating recruitment strategies. My expertise lies in navigating the dynamic landscape of talent acquisition, employing innovative approaches to attract, assess, and secure top-tier candidates. I excel in optimizing hiring processes, leveraging cutting-edge technologies, and fostering collaborative relationships with stakeholders. A keen understanding of industry trends allows me to stay ahead, ensuring a competitive edge in securing the best talent for your organization. I am passionate about connecting the right people with the right opportunities and thrive in creating impactful, streamlined recruitment solutions.

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