March 4, 2026 • 1 min read

Weekly Engineering Mastery Quiz (2026-03-02 to 2026-03-06)

A 20-question assessment covering fundamentals, implementation best practices, and advanced architecture insights from this week’s learning posts.

#Learning-log#Quiz#Assessment Weekly Quiz

Table of contents

Weekly Reflection
How to Use This Quiz

Weekly Reflection

This assessment captures the Kotlin variables, types, and API design concepts covered during the week. It mixes syntax checks with practical engineering tradeoffs so you can measure both recall and reasoning.

How to Use This Quiz

Use the interactive quiz section below. Single-select questions award 1 point, while multi-select questions can award partial credit (+0.5) when your selection is partially correct.

Interactive Quiz

Score: 0 / 20 | Answered: 0 / 20

Q1 Which Kotlin declaration creates an immutable variable using type inference?

Fundamentals

A. val count = 10 B. var count: Int C. val count: Int D. var count = 10

Select one option.

Q2 Which string template syntax is valid Kotlin?

Fundamentals

A. Hello, $name! B. Hello, ${name}! C. Both A and B D. Hello, $(name)!

Select one option.

Q3 By default, what is the type of the literal 3.0 in Kotlin?

Fundamentals

A. Float B. Double C. BigDecimal D. Number

Select one option.

Q4 Which Kotlin type represents a single UTF-16 code unit?

Fundamentals

A. Char B. String C. Byte D. Short

Select one option.

Q5 Which declaration is a valid Boolean with an explicit type?

Fundamentals

A. val done: Boolean = false B. Boolean done = false C. var done = "false" D. val done: bool = false

Select one option.

Q6 Which is the recommended default approach to mutability for local variables?

Intermediate

A. Use var by default and switch to val if needed B. Use val by default and var only when reassignment is required C. Always use var because the compiler optimizes it D. Always use val and reassign via reflection if needed

Select one option.

Q7 Which assignment requires an explicit numeric conversion to compile?

Intermediate

A. val l: Long = 1L B. val f: Float = 1.0 C. val b: Byte = 100 D. val d: Double = 1

Select one option.

Q8 Which lateinit declaration is invalid?

Intermediate

A. lateinit var id: Int B. lateinit var name: String C. lateinit var ref: Any D. lateinit var items: MutableList<Int>

Select one option.

Q9 Which constant declaration is valid?

Intermediate

A. const val VERSION = "1.0" B. const val now = System.currentTimeMillis() C. const var FLAG = true D. const val id: java.util.UUID = java.util.UUID.randomUUID()

Select one option.

Q10 Given data class User(val name: String) and val user = User("Mia"), which template prints "Hello, Mia" exactly?

Intermediate

A. Hello, $user.name B. Hello, ${user.name} C. Hello, $(user.name) D. Hello, ${user}.name

Select one option.

Q11 Which numeric literal is invalid in Kotlin?

Intermediate

A. 1_000_000 B. 0xFF_EC_DE_5E C. 1_.0 D. 0b1010_1011

Select one option.

Q12 Which operator checks structural equality in Kotlin?

Intermediate

A. = B. == C. === D. ~=

Select one option.

Q13 What is the inferred type of val x = null?

Advanced

A. Any? B. Nothing? C. Unit D. Null

Select one option.

Q14 On the JVM, which choice minimizes allocations for a large numeric buffer?

Advanced

A. Array<Int> B. IntArray C. MutableList<Int> D. Array<Number>

Select one option.

Q15 What is the inferred type of val r = 1 + 1L?

Advanced

A. Int B. Long C. Number D. Any

Select one option.

Q16 Which statements about Int overflow on the JVM are true?

Advanced

A. Int addition throws ArithmeticException on overflow by default B. Overflow wraps using two's-complement semantics C. Int arithmetic stays 32-bit and can wrap to negative values D. Overflow saturates at Int.MAX_VALUE

Select one or more options.

Q17 Which statements about Kotlin Char and Unicode are true?

Advanced

A. Char is a single UTF-16 code unit B. Supplementary characters require surrogate pairs in String C. Char stores a complete Unicode code point in all cases D. Char values are nullable by default

Select one or more options.

Q18 Which public API design practices help maintain stability as compiler inference evolves?

Advanced

A. Declare explicit types on public vals/vars and return types B. Avoid relying on inferred public signatures for library boundaries C. Expose Number instead of concrete numeric types everywhere D. Prefer var on all public properties for flexibility

Select one or more options.

Q19 Which statements are safest when dealing with platform types returned from Java APIs?

Advanced

A. Declare nullable Kotlin type (String?) when null is possible B. Force non-null String to simplify call sites C. Be cautious with inferred platform types because nullability is not explicit D. Declare Any to avoid nullability issues

Select one or more options.

Q20 For val list = mutableListOf<Int>(), which statements are true?

Advanced

A. val prevents reassigning list to another list instance B. val prevents mutating elements in a mutable collection C. add/remove still work because mutability belongs to the object, not the reference keyword D. val allows reassignment if the type is MutableList

Select one or more options.

References

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