# Department of Water and Sanitation South Africa Interview Questions, Process, and Tips

Ques:- How many times do the hands of a clock coincide in a day?
A. 20
B. 21
C. 22
D. 24

24 times

Ques:- A can do a job in 18 days and B can do it in 30 days. A and B working together will finish twice the amount of work in ——- days?

A & B one day work= 1/18 + 1/30= 8/90

As we know that number of work is 1

1÷8/90= 1*90/8= 90/8.

Since they say “ twice the amount of work

Then ,2*90/8= 22.5 days

Ques:- A man sees a train passing over a bridge 1 km long. The length of the train is half that of the bridge. If the train clears the bridge in 2 minutes, the speed of the train is
A. 30 km/hr
B. 40 km/hr
C. 45 km/hr
D. 55 km/hr

45 km/hr

Ques:- How flexible are you in working in rotational shifts?
Ques:- A, B, C and D playing cards. A and B are partners. D faces towards North. If A faces towards West, then who faces towards South?

C

Ques:- Examination passed from and either training was done or not?
Ques:- In a certain code, PEAK is written as 3512 and DINE is written as 6895. How is KIND written in that code?

C-2896

Ques:- Find out the wrong number in the series:
15, 16, 34, 105, 424, 2124, 12576
A. 34
B. 105
C. 424
D. 2124

The series is 15, 16, 34, 105, 424, 2124, 12576
1) (15*1) + 1 = 16
2) (16*1) + 2 = 34
3) (34*3) + 3 = 105
4) (105*4) + 4 = 424
5) (424*5) + 5 = 2125
Clearly, they gave 2124 instead of 2125, so it is the wrong number in the series.

Ques:- Satheesh started a business investing Rs.60000. After 3 months, Sunil joined him with a capital of Rs.75000. After another 6 months, Subhash joined them with a capital of Rs.105000. At the end of the year, they made a profit of Rs.19000. Find the share of each.
A. Rs. 8000, Rs. 7500, Rs. 3500
B. Rs. 8000, Rs. 6500, Rs. 4500
C. Rs. 8500, Rs. 7000, Rs. 3500
D. Rs. 8500, Rs. 6500, Rs. 4000

A. Rs. 8000, Rs. 7500, Rs. 3500

Ques:- What is the sum of all numbers between 100 and 1000 which are divisible by 14 ?

The numbers that lie between 100 and 1000 which are divisible by 14 are 112, 126,140 …,994
a = 112; l = 994, d = 14
n= (l−a)/d+1
= (994-112)/14+1
= 64
Sn=n/2(l+a)
= 64/2(994+112)
= 32*1106
= 35392

Ques:- How do you feel about reporting to a younger person?
Ques:- How many times do the hands of a clock point towards each other in a day?
A. 12
B. 20
C. 22
D. 24

22

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:- Out of 10 persons working on a project, 4 are graduates. If 3 are selected, what is the probability that there is at least one graduate among them?

Out of 10 persons, 4 are graduates; so, (10 – 4) = 6 are under-graduates.

If there is no restriction, any three can be chosen from the ten in (10C3) = 120 ways.

Now, if all three chosen are under-graduates; it can take place in (6C3) = 20 ways.

Therefore, the probability that there will be no graduate among the three chosen = (20 / 120) = (1 / 6).

Therefore, the probability that there will be at least one graduate among the three chosen = {1 – (1 / 6)} = (5 / 6) = 0.8333.

Ques:- Company A taken a truck on rent of \$1280 per month. Another company B bought the truck in \$40000 and sends \$120 per month. After 4 years what will be the difference in the amount spent by the both companies on the TRUCK.
Ques:- Evaluate the average of first 10 even numbers is?

11

Ques:- Five persons – P, Q, R, S and T are being compared in weight and height. The second heaviest person. S is the shortest. P is the 2ndÂ tallest and shorter than T, The heaviest person is the third tallest person. There is only one person shorter than Q, who is lighter than T and P respectively.Who is the heaviest person?

R
T,P,R,Q,S

Ques:- What is the 12th term of the series 2, 5, 8, …. ?

a = 2
d = 5 – 2 = 3
Then 12th term is :
This in arithmetic progression
L = a + (12 – 1) d
L = 2 + 11 * 3
L = 2 + 33 = 35

Ques:- Two trains travel from NewYork to Washington and the travel takes 5 hours journey time.Trains leave from Washington for every hour and an half hour and the trains leave from NewYork every hour. If the train leaves from new york , Then how many trainsfrom washington cross this train on its way?

5 trains

Ques:- Find the area of a square field whose diagonal of length 20 m?

Diagonal of square=1.414* a, where a is side of square.
ans=1.414*20
ans=28.28

Ques:- Find the C.I. on a sum of Rs.1600 for 9 months at 20% per annum, interest being compounded quarterly?
Ques:- A banana plantation is located next to a desert. The plantation owner has 3000 bananas that he wants to transport to the market by camel, across a 1000 kilometre stretch of desert. The owner has only one camel, which carries a maximum of 1000 bananas at any moment in time, and eats one banana every kilometre it travels. What is the largest number of bananas that can be delivered at the market?
Ques:- What is the job goals life goals
Ques:- Divide Rs.118000 among three persons A, B and C such that the ratio of the shares of A and B is 3:4 and that of B:C is 5:6?
Ques:- Convert 251 decimal to base 8(i.e. octal)?

373

Ques:- X, Y and Z rents a pasture for Rs.870. X put in 12 horses for 8 months, Y 16 horses for 9 months and Z 18 horses for 6 months. How much should C pay?
Ques:- Why do you want to work for us or our company? or Why do you want this job?
Ques:- An integer us divisible by 16 if and only if its last X digits are divisible by 16. The value of X would be
A. 3
B. 4
C. 5
D. 6