# Mainspring, inc. Interview Questions, Process, and Tips

Ques:- IN A ROOM THERE IS ONE BULB OUTSIDE F THE ROOM THERE ARE THREE SWITCHES ONLY ONE SWITCH IS CONNECTED THE BULB.YOU ARE ALLOWED TO STAND NEAR THE SWITCH FOR 5 MINUTES WHAT EVER YOU DO THE SWITCH.AFTER 5 MINUTES ENTER THE ROOM AND TO SAY WHICH IS THE CORRECT SWITCH FOR THE BULB
Ques:- How would you solve problems if you were from Mars?
Ques:- a=2,b=3,c=6 c/(a+b)-(a+b)/c=?

6/(2+3)-(2+3)/6
=6/5-5/6
=(36-25)/30
=11/30
ans is 11/30

Ques:- What would you do if a fellow executive on your own corporate level wasn?t pulling his/her weight?and this was hurting your department?
Ques:- Why are u changing ur job
Ques:- What is your core area of competency?
Ques:- Give me an example of a time you had to file a complaint against a co-worker.
Ques:- Consider an n by n grid of squares. A square is said to be a neighbour of another one if it lies directly above/below or to its right/left. Thus, each square has at most four neighbours. Initially, some squares are marked. At successive clock ticks, an unmarked square marks itself ifat least two of its neighbours are marked. What is the minimum number of squares we need to mark initially so that all squares eventually get marked?
Ques:- A rectangular plate with length 8 inches, breadth 11 inches and thickness 2 inches is available. What is the length of the circular rod with diameter 8 inches and equal to the volume of the rectangular plate?
Ques:- How will you manage security of v vip person
Ques:- Raj has a jewel chest containing Rings, Pins and Ear-rings. The chest contains 26 pieces. Raj has 2 and 1/2 times as many rings as pins, and the number of pairs of earrings is 4 less than the number of rings. How many earrings does Raj have?…

6 pairs of earrings. So 12 earrings.

The total has to be 26, so let’s say there’s 6 pairs of earrings and the number of pairs has to be 4 less than the number of rings. So that would make 10 rings. The 10 rings has to be 2 1/2 greater than the number of pins. So you would divide 10/2.5 = 4 Pins. That would equate to a total of 12 earrings, 10 rings, and 4 pins. A total of 26 pieces.

Ques:- Two trains are moving in the same directions at 65 km/hr and 45 km/hr. The faster train crosses a man in slower train in 18 seconds. The length of the faster train is
A. 100 m
B. 120 m
C. 145 m
D. 180 m

Relative speed =65-45km/hr
Relative speed=20km/hr
Convert to m/s
S=20*5/18
S=5.555
Length of the faster train =5.55555*18seconds
=100meters

Ques:- A can do half the work in one day where as B can do it full. B can also do half the work of C in one day. Ratio in their efficiency will be?

1:2:3 or 1:2:4

Ques:- A and B enter into partnership with capital as 7:9. At the end of 8 months, A withdraws. If they receive the profits in the ratio of 8:9 find how long B’s capital was used?
Recent Answer : Added by Md. Mirshah Uddin Tanvir On 2023-06-11 15:43:53:

7 months

Ques:- Aptitude and Personal background
Ques:- If a: b = 7: 5, b: c = 9: 11, Evaluate a: b: c?

63:45:55

Ques:- If there are 9 yellow balls, 3 red balls and 2 green balls. What is the probability that the second ball picked is yellow given the first ball is yellow a. 8/13 b. 9/13 c. 8/14 d. 9/14

Mm

Ques:- A number when divided by the sum of 555 and 445 gives two times their difference as quotient and 30 as the remainder. The number is
A. 1220
B. 1250
C. 22030
D. 220030

dividend=divisor*quotient+remainder
x=1000*(2*(110))+30
x=22000+30
x=22030

Ques:- What were some of the things about your last job that you found most difficult to do?
Ques:- In near future would you be willing to manage a branch office? If no, why not?
Ques:- What would you say is your biggest fault?
Ques:- The difference between a two-digit number and the number obtained by interchanging the digits is 36. What is the difference between the sum and the difference of the digits of the number if the ratio between the digits of the number is 1 : 2 ?

The number is greater than the number obtained in reversing the digits and the ten’s digit is greater than the unit’s digit
Let ten’s and unit’s digit be 2x and x respectively
Then, (10×2x+x)−(10x+2x)=36
9x=36
x=4
Required difference=(2x+x)−(2x−x)=2x=8

Ques:- A train sets off at 2 p.m. at the speed of 70 kmph. Another train starts at 3:30 p.m. in the same direction at the rate of 85 kmph. At what time the trains will meet?
Ques:- Anita, Indu and Geeta can do a piece of work in 18 days, 27 days and 36 days respectively. They start working together. After working for 4 days. Anita goes away and Indu leaves 7 days before the work is finished. Only Geeta remains at work from beginning to end. In how many days was the whole work done?

4.224 days

Ques:- What do you dislike about the college you studied?
Ques:- Number Series 19,24,20,25,21,26,?