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RRB JE 2019:Maths Revision Quiz-5

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Question 1

Rohit can do a work in 60 days. Rohit and Kamal can do the same work in 40 days while Vishal and Kamal can do the same in 30 days. In how many days can Rohit, Kamal, and Vishal complete the entire work together?

Question 2

The procedure given below is required to find and replace certain characters inside an input character string supplied in array A. The characters to be replaced are supplied in array oldc, while their respective replacement characters are supplied in array newc. Array A has a fixed length of five characters, while arrays oldc and newc contain three characters each. However, the procedure is flawed.
void find_and_replace (char *A, char *oldc, char *newc) {
for (int i=0; i<5; i++)
for (int j=0; j<3; j++)
if (A[i] == oldc[j]) A[i] = newc[j];
}
The procedure is tested with the following four test cases.
(1) oldc = “abc”, newc = “dab”
(2) oldc = “cde”, newc = “bcd”
(3) oldc = “bca”, newc = “cda”
(4) oldc = “abc”, newc = “bac”
If array A is made to hold the string “abcde”, which of the above four test cases will be successful in exposing the flaw in this procedure?

Question 3

If 2cosec2A = x, then the value of x is

Question 4

What is the median of the following data: 1.2, 10, 1.8, 7.25, 4.1, 8.6, 5.3, 9.2, 2.5, 6

Question 5

Ram is facing towards the south. He turns to his left and moves 40 km, and then turns to his right and moves 50 km more. Finally, he turns to his left again and moves 60 km. Which direction is he facing now?

Question 6

Two equal circles pass through each other’s centre. If the radius of each circle is 5 cm, what is the length of common chord?

Question 7

Three boats port P1, P2 and P3 are alongside a river. P2 is the exactly midway between P1 and P3. A boatman takes 2hr 48min to row from P1 to P3. And takes 4 hrs to row from P1 to P2 and back. How much time will he take to row from P3 to P1?

Question 8

Two trains are moving in the same direction. Speeds of both trains are 60 km/h and 48 km/h respectively and the respective ratio of length of these trains is 3 : 5. If faster trains crosses the second train in 60 seconds then what is length of slower train?

Question 9

What is the sum of all natural numbers between 100 and 400 which are divisible by 13?

Question 10

Sum of LCM and HCF of 6, 15 & 12 is

Question 11

The ratio of ages of father and daughter at present is 3:1, Four year ago their ratio was 4:1. The average age of father and daughter 2 year hence will be:

Question 12

In a partnership, A invest 1/6 of the capital for 1/6 of the time, B invest 1/3 of the capital for 1/3 of the time and C invest rest of the capital for whole time. Out of a profit of Rs. 4600, B’s share is?

Question 13

A shopkeeper bought some notebooks at the rate of 2 notebook for Rs. 30 and sold at the rate of 3 for Rs. 50. Find the gain percentage:

Question 14

In a competitive examination a student scored 45% marks and failed by 25 marks. Another student scored 60% marks and obtained 35 marks more than pass mark. The pass marks set by the exam authority was:

Question 15

The distance between two places A and B is 60 km. Two cars start at the same time from A and B, travelling at a speed of 35km/h and 25km/h, respectively. If the cars run in the same direction, then they will meet after (in hours)
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