## Doubts of DI-4

Post your doubts on DI questions appearing in the class sheets and Basic reference books

### Doubts of DI-4

Dear All,

Posts: 228
Joined: Wed Feb 13, 2013 5:51 am

### Re: Doubts of DI-4

sir i completed DI-04 sheet and i have few doubts and questions are;
12,15,40,49
Dear All,

sir i completed DI-04 sheet and i have few doubts and questions are;
12,15,40,49
gaurav1399

Posts: 48
Joined: Wed Feb 27, 2013 7:49 am

### Re: Doubts of DI-4

12. If the straight line journey from R to S is prohibited, the shortest distance from P to Q is approximately
(a) 22 (b) 19.7 © 38.5 (d) None of these

solution

If the straight line distance from RS is prohibited then one has to move RS along the curve- hENCE the total distance is

PR + arc RS + SQ = 2 + 5 X 22/7 + 2 = 19.7

Posts: 228
Joined: Wed Feb 13, 2013 5:51 am

### Re: Doubts of DI-4

15. The speeds of a person travelling from P to Q are as follows : towards the centre 2/min, away from centre 6/min and along
the circumference 0.5/min. The time required to reach Q from P ( RS to be traversed along circumference) is :
(a) 45 minutes (b) 33 minutes © 7 minutes (d) 22 minutes

Solution:

To travel from P to Q the person has to move the following distances

PR (towards the centre) + RS ( along the circumference) + SQ ( away from the centre)

Time taken = 2/2 + 5 x 22/7 x 1/0.5 + 2/6 = 32 .6 or 33 minutes

Posts: 228
Joined: Wed Feb 13, 2013 5:51 am

### Re: Doubts of DI-4

40. What is the percentage growth in India's total trade deficit between 1997-98 and 1998-99?
(a) 43 (b) 47 © 50 (d) 40

Solution

The deficit is = Exports - Imports

Deficits for the year 1997-98 = 40779 - 33979 = 6980
For the year 1998-99 , the data has been provided only for the first 8 months and an additional information has been provided that this data corresponds to the firs 8 months and that the average monthly deficit for the remaining four months is the same as that for the first 8 months-

Deficit for the first 8 months of 1998-99 = 28126 -21436 =6690

Average monthly deficit = 6690/8= 836.25
The deficit for the last four months = 836.5 x 4 = 3346

Total deficit for the year 1998-99 = 6690+3346 =10036

Thus the growth in deficit is around - 47 %

Posts: 228
Joined: Wed Feb 13, 2013 5:51 am

### Re: Doubts of DI-4

48. If the ratio of arts students in K and U is 2:5, what is the ratio of the total number of students in these is?
(a) 4 : 15 (b) 1 : 5 © 8 : 15 (d) 8 : 5

Solution
From the diagram we can see that the percentage of arts students in K and U respectively is = 37.5 % and 50 %

The number of students who have taken arts in K = 37.5 % OF K
The number of students who have taken arts in U =50 % of U

37.5% OF K/50%OF U =2/5