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This page contains the most recently asked technical questions and answers in the SRF.

All of the questions listed below were collected by students recently placed at SRF.

**Ques:- Find out the wrong number in the series:**

789, 645, 545, 481, 440, 429, 425

789, 645, 545, 481, 440, 429, 425

**Ques:- Complete the series: 2, 5, 9, 19, 37, ……**

**Recent Answer**: :

75

**Ques:- A computer printer produced 176,400 lines in a given day. If the printer was in operation for seven hours during the day, how many lines did it print per minute?**

**Recent Answer**: :

a printer produced 176400 lines in 420 minutes

it produces 176400/420 lines per minute = 420

answer is : 420 lines per minutes

**Ques:- A work is done by two people in 24 minutes. One of them alone can do it in 40 minutes. How much time will the other person wiil take to complete it**

**Recent Answer**: :

1/24-1/40

(5-3)/120

2/120

1/60

60 minutes

**Ques:- A Man is sitting in the last coach of train could not find a seat, so he starts walking to the front coach ,he walks for 5 min and reaches front coach. Not finding a seat he walks back to last coach and when he reaches there,train had completed 5 miles. what is the speed of the train ?**

**Ques:- Below is an equation that isn't correct yet. By adding a number of plus signs and minus signs between the ciphers on the left side (without changes the order of the ciphers), the equation can be made correct. 123456789 = 100 How many different ways ar**

**Recent Answer**: :

28

to arrange m objects in n places => nCm

i.e. for this example m=2(+,- sign) and n = 8(places between two number from 1 to 9)

SO, answer is : 8C2 = (8*7) / 2 = 28

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**Ques:- Two trains of equal length when moving in opposite direction takes 5 sec. to cross each other completely and when moving in same direction takes 15 sec. Find the ratio of their speed.**

**Recent Answer**: :

Let’s assume the length of each train is ‘L’ and the speeds of the two trains are ‘V₁’ and ‘V₂’ respectively.

When the trains are moving in the opposite direction, their relative speed is the sum of their individual speeds. The total distance they need to cover is the sum of their lengths. Since they cross each other completely in 5 seconds, we can set up the following equation:

(V₁ + V₂) × 5 = 2L

When the trains are moving in the same direction, their relative speed is the difference between their individual speeds. The total distance they need to cover is the difference between their lengths. Since they cross each other completely in 15 seconds, we can set up the following equation:

(V₁ – V₂) × 15 = 2L

Now, let’s solve these equations to find the ratio of their speeds.

From the first equation, we have:

(V₁ + V₂) × 5 = 2L

V₁ + V₂ = (2L) / 5

From the second equation, we have:

(V₁ – V₂) × 15 = 2L

V₁ – V₂ = (2L) / 15

Let’s add these two equations together:

V₁ + V₂ + V₁ – V₂ = (2L) / 5 + (2L) / 15

2V₁ = (6L + 2L) / 15

2V₁ = (8L) / 15

V₁ = (4L) / 15

So, the speed of the first train is (4L) / 15.

Now, let’s substitute this value back into the first equation to find V₂:

(4L) / 15 + V₂ = (2L) / 5

V₂ = (2L) / 5 – (4L) / 15

V₂ = (6L – 4L) / 15

V₂ = (2L) / 15

Therefore, the speed of the second train is (2L) / 15.

The ratio of their speeds is given by:

(V₁ / V₂) = ((4L) / 15) / ((2L) / 15)

(V₁ / V₂) = 4L / 2L

(V₁ / V₂) = 2

So, the ratio of their speeds is 2:1.

**Ques:- Which among the following countries has joined World Trade Organisation as the 153rd member**

**Ques:- What do you look for in a job?**

**Ques:- Give three things that you consider when looking for a job… And why? please do not include good salary…Thanks.**

**Recent Answer**: :

friendly environment, supportive colleagues and place where i’ll have to work.

**Ques:- Tom has three boxes with fruits in his barn: one box with apples, one box with pears, and one box with both apples and pears. The boxes have labels that describe the contents, but none of these labels is on the right box. How can Tom, by taking only one piece of fruit from one box, determine what each of the boxes contains?**

**Ques:- What type of books do you read and why?**

**Ques:- About family background and monthly income of family**

**Ques:- What is in you that we hire you for this position?**

**Ques:- The difference between the two digit number and the number obtained by interchanging its digits is 54. The difference between the digits is?**

**Recent Answer**: :

6

**Ques:- P, Q and R invests Rs.2000, Rs.3000 and Rs.4000 in a business. After one year P removed his money; Q and R continued the business for one more year. If the net profit after 2 years be Rs.3200, then P’s share in the profit is?**

**Recent Answer**: :

Complete step-by-step answer:

Investment made by A for 1 year, IA=2000

Investment made by B for 2 year,

IB=2×3000IB=6000

Investment made by C for 2 year,

IC=2×4000IC=8000

The ratio of their investment is given by

IA:IB:IC=2000:6000:8000

To simplify the ratio divide it by 1000,

IA:IB:IC=2:6:8

Now again to simplify divide the ratio by 2,

IA:IB:IC=1:3:4

The total parts of this investment =1+3+4=8

A’s share in the investment is 1 out of the 8 parts; B’s share is 3 out of 8 while C’s share is 4.

Therefore, the profit share of A’s investment of Rs. 2000=18×3200=400.

**Ques:- 15 people entered a theater before Sujit. 7 people entered the theater between Sujit and Suraj and 20 people entered the theater after Suraj. If Suraj entered the theater before Sujit then how many people are there in the theater?**

**Ques:- A gets 3 times as much money as B gets, B gets only Rs.25 more then what C gets. The three gets Rs.675 in all. Find the share of B?**

**Ques:- Ram sold two bicycles, each for Rs.990. If he made 10% profit on the first and 10% loss on the second, what is the total cost of both bicycles?**

**Ques:- In a row of girls, Shilpa is eight from the left and Reena is seventeenth from the right. If they interchange their positions, Shilpa becomes fourteenth from the left. How many girls are there in the row ?**

**Recent Answer**: :

Before Swapping

_ _ _ _ _ _ _ Shilpa ……..Reena _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _

After Swapping

_ _ _ _ _ _ _ Reena _ _ _ _ _ Shilpa _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _

—————————–>14=17 <——————————-

So total number of girls in that row are 30

Recent Answer: Added by narendra On 2022-09-18 09:01:36:b