BlackRock OA Questions 2026 — Online Assessment & Interview Practice

213 real BlackRock online assessment questions from recent interviews. Includes coding rounds, MCQs, and BlackRock interview preparation tips for SDE Intern, New Grad, and full-time roles.

• Selenium Java: Failure Page Source Capture
• Word-Score Flowchart: The Inner Loop Exit Test
• Word-Score Flowchart: Scoring a Consonant
• Word-Score Flowchart: The Outer Loop Counter
• The Word That Is Not an Oracle SET Operator
• What a UNION of EMPLOYEES and JOB_HISTORY Returns
• Root After Deleting and Reinserting 45 in the AVL Tree
• Output of operate on the Array-Encoded Tree
• In-order Traversal of the Twelve-Key BST
• Post-order Traversal of the Twelve-Key BST
• Pre-order Traversal of the Twelve-Key BST
• Change in the Number of Left Children After Mirroring
• Root of the Tree After the Mirror Routine
• Flowchart Word Scorer: What Goes in Cell 4
• Depth of the Mirrored Binary Tree
• Spotting Wrong Customer IDs Against Contact Numbers
• Two-Squares Flowchart: Splitting the Number
• Flowchart Word Scorer: What Goes in Cell 3
• Confirming Correct Contact Numbers for Five Customers
• Two-Squares Flowchart: Marking the First Representation
• Spotting Wrong Contact Numbers for Five Customers
• Matching Drill and Cutter Part Numbers to Their Names
• Prime-Sum Flowchart: Advancing the Candidate
• Matching Punch and Reamer Parts to Their Part Numbers
• Flowchart Word Scorer: What Goes in Cell 1
• Seven in a Row: Which Pair Sits Together
• Prime-Sum Flowchart: Advancing the Trial Divisor
• Drill and Cutter Codes: Matching Numbers to Names
• Maximum Average Annual Growth from 1996 to 2000
• Prime-Sum Flowchart: Initialising the Trial Divisor
• Highest Five-Year Average Paper Production
• Largest Single-Year Growth in Paper Production
• Prime-Sum Flowchart: the Loop Termination Test
• Phone Numbers and Customer IDs: The Wrong Pairings
• Missing Term in the Series 1, 3, 2, 8, 5, __, 26
• Which Word Comes Next
• Filling the CY Cell of a 3x3 Equal-Sum Grid
• Multi-Linked Structure Used for Storing Images
• Punches and Reamers: Which Part Numbers Are Right
• Coding CRYSTAL When ABSOLUTE Is 1CT4M5V2
• Coding PALLAVI in the DEEPALI Language
• Contrapositive of John's Work-and-Pay Conditional
• Internal Storage Structure of a Relational Database
• Value of the Symbolic Expression
• Fastest Average Annual Growth Over Five Years
• Juice-to-Pulp Ratio After a 300 g Apple Dries to 200 g
• Minimum and Maximum Nodes Traversed in a BST Search
• When Five Visitors at Intervals 1 to 5 Next Coincide
• What G Wanted to Become
• Finding X When Ten More Men Save Twenty Days
• New Root After Inserting 10 into the BST
• Seven in a Row: Who Sits Side by Side
• Probability of Rolling a Sum of Nine with Two Dice
• Income Tax Increase and Implicit Assumptions
• Function That Prints the In-Order Traversal
• Probability a Drawn Card Is a Spade or a Queen
• Largest Year-on-Year Jump in Paper Output
• Litres of 10% Solution Added to Reach 12% Salt
• Function That Prints the Post-Order Traversal
• Stoppage Minutes per Hour at 64 and 55 kmph
• Data Sufficiency: Profit or Loss on Apples
• AVL Root After Deleting and Re-inserting 45
• Total Principal from Matching Simple and Compound Interest
• Function That Prints the Pre-Order Traversal
• Sugar Expenditure After a 20% Price Rise and 25% Cut
• Mirroring a BST: The Root Afterwards
• Completing the preOrder Scanner for the Prefix Form
• Ratio Expression from a/b = 2/3 and c/b = 3/2
• Syllogism: All Jokers Are Kings, Some Kings Are Red
• Mirroring a BST: Change in Left-Child Count
• Postfix Form of a Parenthesised Expression
• Cost of R Pens and R Markers
• Return Value of operate(root, 4) on a Seven-Node Tree
• Prefix Form of a Parenthesised Expression
• Data Sufficiency: Whose Savings Are the Highest
• What the Recursive operate() Function Does
• Interleaved Squares Series: 1, 3, 2, 8, 5, ?, 26
• BST In-order Traversal of a Twelve-Key Insert
• Completing a Nine-Number Equal-Sum Grid
• BST Post-order Traversal of a Twelve-Key Insert
• What the Three-Table SELECT Represents
• Which Symbol-Substituted Inequality Is False
• BST Pre-order Traversal of a Twelve-Key Insert
• UNION ALL of Two Single-Row Queries
• Return Value of CONNECT_BY_ISCYCLE
• Two Typists, One Three Times Faster
• Data Sufficiency: Counting the Girls in a Class
• Which Statement Follows From a Compound Conditional
• Unique Combinations of Two Columns
• Ram's Maximum Average Weekly Wage
• Juice to Pulp in a Dried Apple
• Engine Power: Compensating a Bore Increase
• Employees with More Than Ten Years of Service
• Five Visitors on Different Cycles Meet Again
• Four Friends, Ten Hotels, At Least One Shared
• Creating a View over Column Aliases
• Ten Extra Men Finish Twenty Days Sooner
• Guaranteed Divisor of Three Consecutive Even Numbers
• Column Count of a Cross Join
• Rolling a Total of Nine With Two Dice
• Vowels Together in MULTIPLE
• Nested ROUND, TRUNC and MOD on 1600
• Spade or Queen From a Standard Deck
• Men and Boys Painting a Wall
• Character Function That Returns a Number
• When Two Simple Interests Coincide
• Group Function for a Department Sales Total
• Diluting a 20% Salt Solution Down to 12%
• Eight Friends in a Circle: Which Statement Holds
• Minutes a Train Stops per Hour
• Rounding a Date to the Nearest Year
• Six-Month Sales Graph: Best Average Monthly Growth
• Split Savings Across Simple and Compound Bonds
• Six-Month Sales Graph: Minimum Total Revenue
• Sugar Bill After a Price Rise and a Consumption Cut
• How NVL2 Differs from NVL
• Six-Month Sales Graph: Highest Average Revenue
• CLOB Result Exceeding the Maximum Length
• Trains and Platform: Pick the Valid Deduction
• Arithmetic Operator for a Product
• Grocer's Apple Profit Expression
• Part Catalogue: Matching the Mild Steel Washer
• Correct Definition of a View
• Milkman's Extra Water and Extra Price
• Part Catalogue: Spotting the Ball-Bearing Match
• Valid Representation of DDL
• Ratio Algebra: Squares of a and c Over b
• Annual Compensation with a Monthly Bonus
• Marble Game Flowchart: The Termination Test
• Which Is Not a Valid Character Set
• Address Register Lookup: Barbara Richart
• Marble Game Flowchart: Keeping the Score Non-Negative
• Address Register Lookup: Lucille Gordon
• Marble Game Flowchart: Scoring the Blue Pair
• Address Register Lookup: Jessica Pope
• Default Precision of INTERVAL YEAR TO MONTH
• Marble Game Flowchart: The First Decision
• Part Catalogue Audit: Feed Arm Lever Cam Roll Code
• Median Flowchart: Choosing the Median Formula in Cell 5
• Part Catalogue Lookup: Spotter Head Clamp
• Median Flowchart: The Pass-End Test in Cell 4
• Part Catalogue Audit: Spotter Plungers Code
• Median Flowchart: The Comparison in Cell 2
• Which SET Operator Does Not Exist
• Pole in the River: Deducing Its Length from the Rise
• Recovering a View's Defining Query
• The Parts of a Python List Comprehension
• UNION Across EMPLOYEES and JOB_HISTORY
• Customer Directory: The Only Correct Pairing
• Sum-of-Two-Squares Flowchart: Cell 5
• Customer Directory: Both Pairings Wrong
• Sum-of-Two-Squares Flowchart: Cell 4
• Customer Directory: Isolating the Wholly Incorrect Pairings
• Sum-of-Two-Squares Flowchart: Cell 2
• Printing Three Unpacked Values in Python 2
• Sum-of-Two-Squares Flowchart: Cell 1
• List Comprehension Producing [5, 5, 8] from a Matrix
• Implicit Assumptions Behind a Productivity Bonus
• Coded Operations: Evaluating F(F(E12 A E16) C F(50 B 5 C 5))
• Converting a List of Months to a Set
• Seven-Digit Numbers from a Digit Set Containing Zero
• Six People on a Line: Who Are Neighbours
• Data Sufficiency: The Class Average in Mathematics
• Three-Product Sales Chart: The Peak Month
• Diamonds, Thieves and Angels: What Kathy Keeps
• Average Speed over Two Legs in Ratio 2 : 3
• Data Sufficiency: Is x - y Positive
• Probability of Centuries in Four Specified Matches
• Loss in Value When a Diamond Breaks in Three
• Reaping the Field with More Men and Longer Days
• Twenty Percent Shorter, But How Much Taller
• Part Catalogue: Which Spring Code Matches Its Description
• Least Digit Making 451?603 Divisible by 9
• Games, Sports and Gambles: Which Conclusion Always Follows
• Doubling the Selling Price Quadruples the Profit
• Listing Departments Chronologically by Formation Date
• Classifying CREATE, SELECT, MERGE, RENAME, DROP and DELETE
• Which Employee Name Matches LIKE 'jack%'
• Clauses Allowed in the SELECT That Defines a View
• Result of ABS(+45) + ABS(-15) From DUAL
• Rows Returned by sal > ANY Intersected with sal < ALL
• Selecting ROWNUM From DUAL Filtered on ROWNUM
• Ensuring salary * Hike_percent Always Displays a Value
• Single Row Functions Versus Multiple Row Functions
• Which Statement About a Database Table Is True
• The Relational Principle Behind SELECT Search Criteria
• Which SQL Category the INSERT Statement Belongs To
• DECODE Compared Against a NULL Search Value
• Which Statement About the Set Operators Is True
• Function That Manipulates Character, Number or Date Columns
• CASE Expression Substituting 99 for a NULL Commission
• Recovering the Base Query of a Forgotten View
• Output of Sub.method Chaining Back to Super.method
• Valid Data Types for a Dictionary Key in Python
• Setting Trace Hooks to Monitor Functions in a Program
• Which Empty Class Definitions Run Without Error
• Comparing Two Sets After update With Existing Members
• Opening a Text File for Reading in Python
• Joining a Path List with '/'.join
• Calling str.partition With No Argument
• Centring a String to Width 24 with Asterisks
• Result of s[:1] + s[1:] for Any String
• Coding Language: RAINDROP Written as TCKPBPMN
• Build the List [3, 2, 1, 0, 1, 4] with append
• Median Flowchart: Recording That a Swap Happened
• Median Flowchart: Initialisation Before the Sort Loop
• Sprinter Speed Ratio Before and After Coaching
• Few-Shot Prompting: What Drives the Improvement
• Primary Benefit of k-Fold Cross Validation
• Embeddings Represent Text As
• Effect of Low Sampling Temperature
• Minimum Height
• Airport Baggage Handling System