Preparation guide
Blackrock Aptitude Questions
Overview
This page has BlackRock aptitude questions with full solutions - numerical ability, verbal, and logical reasoning - in the style students report for the BlackRock Online Assessment. Start with the timed mock quiz, then work the solved set and log every miss by topic.
BlackRock Aptitude Mock Quiz
Timed placement-style MCQs with score and explanations after you submit. Use it to check speed and accuracy before the real test.
Questions15
Time10 min
Quantitative
A sum of money amounts to ₹9800 after 5 years and ₹12005 after 8 years at the same rate of simple interest. Find the rate of interest per annum.
Let Principal = P, Rate = R% After 5 years: P + (P × R × 5)/100 = 9800 After 8 years: P + (P × R × 8)/100 = 12005 Subtracting: (P × R × 3)/100 = 12005 - 9800 = 2205 P × R = 73500 From first equation: P + (73500 × 5)/100 = 9800 P + 3675 = 9800 P = 6125 Rate R =
Reasoning
Which of the following is the next term in the series: 2, 6, 12, 20, 30, ?
Pattern: Differences are 4, 6, 8, 10 (consecutive even numbers) Next difference = 12 Next term = 30 + 12 = 42 Alternative pattern: n(n+1) where n starts from 1 1×2=2, 2×3=6, 3×4=12, 4×5=20, 5×6=30, 6×7=42
Quantitative
What does "Break the ice" mean?
"Break the ice" means to initiate conversation in a social setting.
Quantitative
A student scored 60, 70, and 80 in three subjects. If the weights are 2, 3, and 5 respectively, find the weighted average.
Correct answer: 73
Quantitative
Simple interest on ₹5,000 at 8% p.a. for 3 years is:
SI = PRT/100 = 5000×8×3/100 = ₹1,200.
Verbal
Problem: "She is allergic _____ peanuts." a) to b) from c) with d) by
"Allergic to" is the correct prepositional phrase.
Verbal
Choose the correctly spelled word:
Correct spelling is Accommodation.
Verbal
Synonym of "Candid":
Candid means frank or straightforward.
Reasoning
If A is brother of B, B is sister of C, C is brother of D, how is D related to A?
A, B, C, D share the same generation → siblings (gender of D unknown but sibling).
Quantitative
A person walks 6 km East, then 8 km North. How far is he from the starting point?
Correct answer: 10 km
Reasoning
In how many ways can 5 people be arranged in a row?
Correct answer: 120 ways
Reasoning
Statements: 1) All cups are plates, 2) All plates are tables Conclusions: I) All cups are tables, II) All tables are cups, III) Some tables are cups, IV) Some tables are plates.
Correct answer: Only I, III, and IV follow
Reasoning
Odd one out: Cat, Dog, Tiger, Car
Others are animals.
Quantitative
A number is increased by 20% and then decreased by 20%. The net percentage change is:
100 → 120 → 96. Net change = 4% decrease.
Verbal
The company's profits have been _____ steadily over the past year.
Correct answer: declining
Your score
0/15(0%)
Review
Blackrock aptitude topics students usually practice
- Numerical / quantitative: percentages, profit and loss, ratios, time and work, averages, SI/CI, speed-distance
- Logical reasoning: series, coding-decoding, blood relations, seating, syllogisms
- Verbal ability: grammar, vocabulary, error spotting, idioms
Numerical ability questions
Q1: Marked price discount
Problem: A shopkeeper marks goods 20% above cost and then gives a 10% discount. What is the profit percentage?
Solution: Let CP = ₹100. Marked price = ₹120. Discount = 10% of 120 = ₹12. SP = 120 − 12 = ₹108. Profit % = 8%.
Answer: 8%
Q2: Boat upstream
Problem: A boat’s speed in still water is 15 km/h and the stream is 3 km/h. How long to cover 36 km upstream?
Solution: Upstream speed = 15 − 3 = 12 km/h. Time = 36 / 12 = 3 hours.
Answer: 3 hours
Q3: Relative speed trains
Problem: Two trains 120 m and 180 m long run at 40 and 50 km/h in opposite directions. Time to cross?
Solution: Relative speed = 90 km/h = 25 m/s. Distance = 300 m. Time = 12 s.
Answer: 12 seconds
Q4: Train and pole
Problem: A train 150 meters long passes a pole in 15 seconds. What is its speed in km/h?
Solution: Distance = 150 m = 0.15 km. Time = 15 s = 15/3600 h = 1/240 h. Speed = 0.15 ÷ (1/240) = 0.15 × 240 = 36 km/h.
Faster check: 150/15 = 10 m/s → 10 × 18/5 = 36 km/h.
Answer: 36 km/h
Q5: Loss to profit shift
Problem: An article sold at 10% loss would give 5% profit if sold for ₹60 more. Find the cost price.
Solution: 0.9P + 60 = 1.05P 60 = 0.15P P = 60 / 0.15 = ₹400.
Answer: ₹400
Q6: Train platforms
Problem: A 200 m train at 72 km/h crosses a 160 m platform. Time taken?
Solution: Speed = 72 × 5/18 = 20 m/s. Distance = 200+160 = 360 m. Time = 360/20 = 18 s.
Answer: 18 seconds
Q7: Alligation milk
Problem: Milk at ₹40/L and ₹50/L mixed to get ₹44/L. Ratio of quantities?
Solution: Alligation: (50−44):(44−40) = 6:4 = 3:2.
Answer: 3:2
Q8: Series n(n+1)
Problem: Find the next term: 2, 6, 12, 20, 30, ?
Solution: Pattern: 1×2, 2×3, 3×4, 4×5, 5×6, 6×7. Next = 6 × 7 = 42.
Answer: 42
Q9: Time and distance chase
Problem: A is 100 m ahead of B. A runs at 8 m/s and B at 10 m/s. How long until B catches A?
Solution: Relative speed = 2 m/s. Time = 100/2 = 50 seconds.
Answer: 50 seconds
Q10: Calendar day
Problem: If 1 January is a Friday, what day is 1 March of a non-leap year?
Solution: Jan 31 + Feb 28 = 59 days = 8 weeks + 3 days. Friday + 3 = Monday.
Answer: Monday
Verbal ability questions
Q11: Antonym - opaque
Problem: Choose the best antonym of ‘opaque’.
Solution: ‘Opaque’ means not transparent. Opposite: transparent / clear.
Answer: Transparent
Q12: Error spotting
Problem: Spot the error: ‘Neither of the boys have submitted their assignment.’
Solution: ‘Neither’ is singular, so the verb should be ‘has’ (and ideally ‘his’ / ‘their’ per style guide). Correct: Neither of the boys has submitted his assignment.
Answer: have → has
Q13: Phrase - by and large
Problem: Meaning of ‘by and large’?
Solution: Generally / on the whole.
Answer: Generally
Q14: One word - extinct
Problem: A species that no longer exists is?
Solution: Extinct.
Answer: Extinct
Q15: Idiom - piece of cake
Problem: What does ‘a piece of cake’ mean?
Solution: It means something very easy.
Answer: Very easy
Q16: Idiom - hit the nail
Problem: What does ‘hit the nail on the head’ mean?
Solution: To describe exactly the right point.
Answer: Be exactly right
Reasoning ability questions
Q17: Odd one out
Problem: Find the odd one out: 3, 5, 7, 9, 11
Solution: 3, 5, 7, and 11 are prime. 9 = 3×3 is composite, so it is the odd one out.
Answer: 9
Q18: Blood relation
Problem: Pointing to a photograph, Ravi says, ‘She is the daughter of my mother’s only son.’ How is the girl related to Ravi?
Solution: Ravi’s mother’s only son is Ravi himself (assuming one son). The girl is therefore Ravi’s daughter.
Answer: Daughter
Q19: Direction turn
Problem: A person walks 5 km north, then 3 km east, then 5 km south. How far is he from the start, and in which direction?
Solution: North 5 and south 5 cancel. He is 3 km east of the start.
Answer: 3 km east
Q20: Seating hint
Problem: Five friends sit in a row. A is to the left of B but right of C. D is to the right of B and left of E. Who is in the middle?
Solution: Order from left to right: C, A, B, D, E. The middle seat is B.
Answer: B
Q21: Number series gap
Problem: Find the missing number: 5, 11, 23, 47, ?
Solution: ×2+1 pattern: 5→11→23→47→95.
Answer: 95
Q22: Blood uncle
Problem: A is B’s brother. C is A’s mother. D is C’s father. How is B related to D?
Solution: D is C’s father; C is mother of A and B. B is D’s grandchild.
Answer: Grandchild
Timed practice tips for Blackrock
- First pass: only high-confidence questions
- Mark and skip time sinks early
- Keep verbal accuracy high - these are easy marks if you stay calm
- Run the mock quiz at least three times a week under real timing
- Sleep properly the night before; fatigue hurts DI and calculation accuracy
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