Prep Guide
Plan
Zerodha aptitude questions
Overview
Section titled “Overview”Practice Zerodha aptitude questions for Zerodha Assignment / Interviews.
Zerodha 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
If Thursday was the day after the day before yesterday five days ago, what is the least number of days ago when Sunday was three days before the day after tomorrow?
Correct answer: Requires careful day calculation (typically 2-4 days ago)
Quantitative
If the sum of the first 50 natural numbers is S, what is the value of S?
Sum of first n natural numbers = n(n + 1)/2 For n = 50: S = 50 × 51 / 2 = 1275
Reasoning
Series: 1, 4, 9, 16, 25, ?
Perfect squares → 36.
Verbal
Problem: Choose the correct sentence: a) She likes reading, writing, and to dance b) She likes reading, writing, and dancing c) She likes to read, writing, and dancing
Parallel structure requires same form: all gerunds or all infinitives. Option b maintains parallelism with all gerunds.
Quantitative
The average of 6 numbers is 25. If one number is 30, what is the average of the remaining 5 numbers?
Correct answer: 24
Reasoning
If in a certain code, FLOOR is written as EKNQQ, how is TABLE written?
Each letter −1: T→S, A→Z, B→A, L→K, E→D → SZAKD.
Verbal
Choose the correct form: "Neither the teacher nor the students _____ present."
Correct answer: were
Quantitative
A mixture contains milk and water in the ratio 5:3. If 10 liters of water is added, the ratio becomes 5:4. Find the quantity of milk in the mixture.
Let milk = 5x, water = 3x After adding 10 liters water: Milk = 5x, Water = 3x + 10 Ratio: 5x/(3x + 10) = 5/4 20x = 5(3x + 10) 20x = 15x + 50 5x = 50 x = 10 Quantity of milk = 5x = 5 × 10 = 50 liters
Reasoning
All cats are dogs. Some dogs are rats. Conclusions: I. Some cats are rats. II. Some rats are dogs.
II follows from "some dogs are rats". I does not necessarily follow.
Reasoning
How many 9s are there between 1 and 100?
9,19,29,39,49,59,69,79,89,90–99 → 20 nines.
Verbal
A bouquet of flowers _____ on the table.
Bouquet is singular.
Quantitative
If "CAT" is coded as "3120", "DOG" is coded as "4157", then how is "RAT" coded?
Pattern analysis: - C = 3, A = 1, T = 20 → "3120" - D = 4, O = 15, G = 7 → "4157" Pattern: Position of letter in alphabet For "RAT": - R = 18 - A = 1 - T = 20
Quantitative
A is twice as efficient as B. Together they complete a work in 12 days. In how many days will A alone complete it?
Let B's efficiency = 1 unit/day A's efficiency = 2 units/day Together: 1 + 2 = 3 units/day Total work = 3 × 12 = 36 units A alone: 36 / 2 = 18 days
Reasoning
If P means +, Q means −, R means ×, then 18 R 2 P 6 Q 4 = ?
18 × 2 + 6 − 4 = 36 + 6 − 4 = 38.
Verbal
There are two pipes in a tank. Pipe A is for filling the tank and pipe B is for emptying the tank. If A can fill the tank in 10 hours and B can empty the tank in 15 hours then find how many hours will it take to completely fill a half empty tank?
Correct answer: 15 hours
Your score
0/15(0%)
Review
Question 1
Section titled “Question 1”A finishes in 10 days, B in 15. Together?
Answer: 6 days
Explanation: 1/10+1/15=1/6.
Question 2
Section titled “Question 2”Probability of drawing an ace from a deck?
Answer: 1/13
Explanation: 4/52=1/13.
Question 3
Section titled “Question 3”Pipe A fills in 6h, B in 8h. Together to fill?
Answer: 24/7 hours
Explanation: 1/6+1/8=7/24.
Question 4
Section titled “Question 4”CP Rs.500, SP Rs.600. Profit percent?
Answer: 20%
Explanation: (100/500)*100=20%.
Question 5
Section titled “Question 5”Find next: 2, 6, 12, 20, 30, ?
Answer: 42
Explanation: n(n+1) pattern.
Question 6
Section titled “Question 6”A train 120 m long runs at 54 km/h. Time to pass a pole?
Answer: 8 seconds
Explanation: 54 km/h = 15 m/s; t = 120/15 = 8 s.
Question 7
Section titled “Question 7”Ratio of ages A:B = 4:5. After 6 years = 6:7. A present age?
Answer: 12 years
Explanation: 4x+6 / 5x+6 = 6/7 => x=3 => A=12.
Question 8
Section titled “Question 8”Simple interest on Rs.8000 at 10% for 2 years?
Answer: Rs.1600
Explanation: SI = PRT/100 = 1600.
Question 9
Section titled “Question 9”If 30% of x = 150, x = ?
Answer: 500
Explanation: 0.3x=150 => x=500.
Question 10
Section titled “Question 10”Average of 5 numbers is 20. One number 30 replaced by 10. New average?
Answer: 16
Explanation: Sum 100 -> 80; avg 16.
Extra Drill Set (ZERODHA flavor)
Section titled “Extra Drill Set (ZERODHA flavor)”Q17: A finishes work in 12 days, B in 19 days. Days together?
Rate = 1/12 + 1/19. Days = reciprocal of that sum.
Answer: compute exactly before the exam; practice the fraction form daily.
Q18: Price increases by 27%. Consumption reduction to keep spend constant?
Reduction % = r/(100+r)×100 with r=27.
Answer: 27/(100+27)×100 (simplify).
Q19: Average of 7 numbers is 18. One number 24 replaced by 10. New average?
Sum 126 → 112 → average 16.
Answer: 16
Q20: SI on ₹8000 at 7.5% for 2 years?
SI = 8000×7.5×2/100 = ₹1200.
Answer: ₹1200
Q21: Synonym of “Mitigate”
Answer: Alleviate / reduce
Q22: Series: 3, 9, 27, 81, ?
Multiply by 3 → 243.
Answer: 243
Q23: If NORTH is coded as 13 (letter count? or positions), prefer position-sum drills for your mock bank.
Practice coding-decoding patterns: +1/−1, reverse, position sums.
Answer: pattern-dependent; master 4 common patterns.
Q24: All engineers are graduates. Some graduates are managers. Conclusion: some engineers are managers?
Does not follow necessarily.
Answer: Does not follow
Related
Section titled “Related”Coding
DSA
2026
Year
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