RBI OFFICER GRADE ‘B’ PHASE-I EXAM Held on : 09.11.2019(Part-II)

Total Questions: 50

21. What approximate value will come in place of question mark (?) in the given questions? (You are not expected to calculate exact value)

1.01/4.99×24.97 + 10.01% of 300.03 - 20.96 = ?

Correct Answer: (4) 14
Solution:
≈ 5 + 30 – 21 = 14

22. What approximate value will come in place of question mark (?) in the given questions? (You are not expected to calculate exact value)

9.99×12.02/7.99 + (11.03)² = ? +39.99

Correct Answer: (2) 96
Solution:

23. The respective ratio of the heights of the right circular cylinders A and B is 1:2. If the respective ratio of the volumes of the cylinders A and B is 2:9, what is the respective ratio of radii of cylinders A and B?

Correct Answer: (2) 1 : 3
Solution:

24. In each question, a number series is given. Only one number is wrong which doesn't fit in the series. Find out the wrong number.

26 29 22 25 18 23 14

Correct Answer: (4) 23
Solution:The pattern is :
The pattern is :
26 + 3 = 29
29 – 7 = 22
22 + 3 = 25
25 – 7 = 18
18 + 3 = 21 ≠ [23]
21 – 7 = 14

25. In each question, a number series is given. Only one number is wrong which doesn't fit in the series. Find out the wrong number.

15 20 27 37 51 72 95

Correct Answer: (4) 72
Solution:The pattern is :
15 + 5 = 20
20 + 7 (= 5 + 2) = 27
27 + 10 (= 7 + 3) = 37
37 + 14 (= 10 + 4) = 51
51 + 19 (= 14 + 5) = 70 ≠ [72]
70 + 25 (= 19 + 6) = 95

26. In each question, a number series is given. Only one number is wrong which doesn't fit in the series. Find out the wrong number.

4 15 37 100 224 439 781

Correct Answer: (5) 15
Solution:The pattern is :
1² + 3 = 1 + 3 = 4
3² + 2 = 9 + 2 = 11 ≠ [15]
6² + 1 = 36 + 1 = 37
10² + 0 = 100
15² – 1 = 225 – 1 = 224
21² – 2 = 441 – 2 = 439
28² – 3 = 784 – 3 = 781

27. In each question, a number series is given. Only one number is wrong which doesn't fit in the series. Find out the wrong number.

13 22 40 76 152 292 580

Correct Answer: (4) 152
Solution:The pattern is :
13 + 1 × 9 = 22
22 + 2 × 9 = 22 + 18 = 40
40 + 2 × 18 = 40 + 36 = 76
76 + 2 × 36 = 76 + 72 = 148
≠ [152]
148 + 2 × 72 = 148 + 144 = 292
292 + 2 × 144 = 292 + 288 = 580

28. The cost price of item B is Rs. 180 more than cost price of item A. Item A was sold at a profit of 20% and item B was sold at a loss of 40%. if the respective ratio of selling prices of items A and B is 5 : 4, what what is the cost price of item A?

Correct Answer: (1) Rs. 300
Solution:C.P. of item A = Rs. x
∴ C.P. of item B = Rs. (x + 180)


29. A number is such that when it is multiplied by 7, it gives another number which is as much above 260 as the original number itself is below 260. What is 32% of the original number?

Correct Answer: (4) 20.8
Solution:Let the required number be x.
According to the question,

30. Study the following information carefully and answer the given questions.

The given data is regarding the number of doctors (D) and engineers (E) in Colleges A, B and C.
College A: Respective ratio between male doctors and male engineers is 12: 5 and the difference between them is 280. Total number of females (D + E) is 300. Number of male engineers is 30 more than the number of female engineers.
College B: Total number of males (D + E) = total number of females in college A (D + E). Respective ratio between total number of males (D + E) and total number of females (D + E) is 6: 7 in College B. Respective ratio between the number of female doctors and the number of female engineers is 2: 3. The number of male doctors is one-third of the number of male engineers in College C.
College C: Number of male engineers is 1.5 times the number of female doctors. Total number of females (D + E) is 550. The number of female engineers is 70 more than the number of female doctors. Total number of males (D + E) is 760.
Total number of females (D + E) in college C is approximately what percent less than the total number of males (D + E) in college A?

Correct Answer: (4) 19
Solution:


Females (D + E) in college C = 550
Males (D + E) in college A = 680
∴ Required percent