Reasoning Ability · solved example
On which floor does Q live?
- 7
- 4
- 5
- 6Correct
Solution
Q lives immediately above S, and the only consistent placement puts Q on floor 6.
IBPS RRB Clerk | Preliminary Examination
A compact, single-clock IBPS RRB Clerk practice mock: 18 original questions across Reasoning Ability and Quantitative Aptitude, each with a worked solution. One fourth of a mark is deducted for a wrong answer.
| Section | Questions |
|---|---|
| Reasoning AbilityReasoning Ability | 9 |
| Quantitative AptitudeQuantitative Aptitude | 9 |
A few questions from this test, with the answer key and the method behind it. The full set of 18 runs under a timer, and every solution is on the analysis screen once you submit.
Reasoning Ability · solved example
On which floor does Q live?
Solution
Q lives immediately above S, and the only consistent placement puts Q on floor 6.
Quantitative Aptitude · solved example
The perimeter of a square is 56 cm. What is its area in square centimetres?
Solution
The side is a quarter of the perimeter, 56 / 4 = 14 cm. The area is the side squared, 14 x 14 = 196. Find the side first; squaring the perimeter is the classic slip.
Reasoning Ability · solved example
Who lives immediately above U?
Solution
U is on floor 4, so the person immediately above, on floor 5, is S.
Reasoning Ability · solved example
What is the code for 'demand'?
Solution
Compare the statements in pairs and match the shared word to the shared code. The first and third share only 'gain', and their only common code is 'mi', so gain is mi. The second and third share only 'drives', and their only common code is 'ne', so drives is ne. Now take the second statement: 'steady' and 'market' are its other two words and both also appear in the first, accounting for 'tu' and 'ka' in some order. That leaves 'demand' matched with the one code unaccounted for, 'zi'. This is worth doing in that order, because the pairs that share exactly one word give a code away immediately.
Reasoning Ability · solved example
Pointing to a photograph, Ramesh said, 'She is the daughter of the only son of my grandmother.' How is the woman in the photograph related to Ramesh?
Solution
Resolve the innermost phrase first. The only son of Ramesh's grandmother must be Ramesh's father, because Ramesh descends from her and there is only one son to descend through. The statement therefore says the woman is the daughter of Ramesh's father, which makes her his sister. The word 'only' is doing all the work: without it the son could have been an uncle and the woman a cousin, which is why that option is offered.
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Correct answer
+1
Wrong answer
-0.25
Unanswered
0
Because a blank carries no penalty, guessing only pays when you can eliminate at least two options. The analysis screen after the test shows you exactly where guessing cost you marks.