Olete.in – MCQs, Mock Tests & Government Job Prep | Scala framework Scala Multiple-Choice Questions Set 1

Scala programming language was developed by -

1. James Gosling
2. Martin Odersky
3. Dennis MacAlistair Ritchie
4. Guido van Rossum

✅ Correct Answer: 2

What is the paradigm of the Scala programming language?

1. Object-oriented
2. Statically Types
3. Functional
4. All of the above

✅ Correct Answer: 4

Scala stands for ___.

1. Scalable language
2. Scripted advanced language
3. Sequential language
4. None of These

✅ Correct Answer: 1

Which of the following is not a feature of Scala?

1. Type inference
2. Lazy Computation
3. High order function
4. None of the above

✅ Correct Answer: 4

Is Java required before installing Scala on the system?

1. Yes
2. No
3. Error
4. None of these

✅ Correct Answer: 1

The semicolon (;) in Scala is -

1. Necessary, failing to write will not mark the end of line
2. Not required, it is treated as a character
3. Optional, end of the line does not require ;
4. None of these

✅ Correct Answer: 3

The Scala compiler starts executing from -

1. The first line of code
2. main() method
3. main class
4. End of code

✅ Correct Answer: 2

Which of the following are not present in Scala?

1. Closures
2. Monads
3. Traits
4. None of these

✅ Correct Answer: 4

The correct syntax for creating Single line comments in Scala is,

1. //
2. <!-- -- >
3. /* */
4. %%

✅ Correct Answer: 1

The correct output of the following code is, object MyClass { def main(args: Array[String]) { var i,j=0 for(i <- 0 to 3){ for(j <- 0 until 2){ if(i + j == 3){ print((i*j)+" ") } } } } }

1. 3 3
2. 2 0
3. 0 2
4. 1 1

✅ Correct Answer: 2

Which of these is not a primary data type in Scala -

1. Integer
2. String
3. Array
4. Char

✅ Correct Answer: 3

The size of integer data type in Scala is -

1. 256 bits
2. 4 bits
3. 32 bits
4. 64 bits

✅ Correct Answer: 3

Why is Double better than Float values?

1. It can store double-precision values providing more accurate data to be stored.
2. It stores 64 bits values instead of 32 bits from a float.
3. Float Values are better
4. Both A and B

✅ Correct Answer: 4

Which class is the super-class of all classes in Scala?

1. Ref
2. AnyRef
3. Any
4. AnyVar

✅ Correct Answer: 3

Which type class does not inherit AnyVar?

1. Char
2. Int
3. Float
4. Pointer

✅ Correct Answer: 4

The correct output of the below code block is - object MyClass { def main(args: Array[String]) { var a : Float = 454.32138988f var b : Double = a; printf("a = " + a + " b = " + b) } }

1. a = 454.32138988 b = 454.32138988152344
2. a = 454.32138 b = 454.3213806152344
3. a = 454.32138 b = 454.32138
4. Error

✅ Correct Answer: 3

Default values of string type when it is not initialized -

1. 0
2. Null
3. None
4. " "

✅ Correct Answer: 2

Which type in Scala is a subtype of all types -

1. Int
2. Ref
3. Boolean
4. Nothing

✅ Correct Answer: 4

Statement returned by function when no values are returned in Scala - None of these

1. No value
2. Unit
3. Int
4. None of These

✅ Correct Answer: 2

In Scala, can you return two values?

1. Yes
2. No
3. Error
4. None of These

✅ Correct Answer: 1

What is the range defined by the below statement - range(13, 17, 2)

1. 13 14 15 16 17
2. 13 14 15 16
3. 13 15
4. 13 15 17

✅ Correct Answer: 3

Which is not a Scala method for printing text on the screen?

1. print()
2. printf()
3. printl()
4. println()

✅ Correct Answer: 3

What is the output of following code? val i = 43 i = 231 printf(i)

1. 231
2. 43
3. 0
4. Error

✅ Correct Answer: 4

Literals in Scala are ___.

1. Name of the variables
2. A literal is a value that can be assigned to a variable
3. The type of the values
4. None of these

✅ Correct Answer: 2

Based on Type Casting, which of these conversions is lossy or invalid?

1. Character -> Float
2. Float -> Long
3. Short -> Integer
4. Integer -> Double

✅ Correct Answer: 2

Which type of typecasting is done by the compiler?

1. Implicit Conversion
2. Explicit Conversion
3. Instance conversion
4. None of these

✅ Correct Answer: 1

Explicit Conversion is -

1. Done by the compiler itself
2. Defined by the user
3. Both A and B
4. None of the above

✅ Correct Answer: 2

The getClass() method is used to -

1. Extract the class of the given number
2. Extract the value of the variable
3. Extract the memory location of the variable
4. All of the Above

✅ Correct Answer: 1

Converting Character to Integer will return

1. Error
2. Random integer value
3. ASCII value of the character
4. None of the above

✅ Correct Answer: 3

Which Scala keyword is used to initialize a variable?

1. int
2. var
3. value
4. None

✅ Correct Answer: 2

Lazy initialization is -

1. Creating variables using the lazy keyword
2. Done only on immutable variables
3. Calculated at its first access
4. All of the above

✅ Correct Answer: 4

The total number of keywords in Scala are -

1. 45
2. 34
3. 39
4. 52

✅ Correct Answer: 3

Which of these is not a keyword in Scala?

1. int
2. var
3. forsome
4. package

✅ Correct Answer: 1

Using a keyword as a value will lead to -

1. Error
2. Compile with the NULL value
3. Warning
4. None of the above

✅ Correct Answer: 4

Is 'sealed' a keyword in Scala -

1. Yes
2. No
3. Error
4. None of These

✅ Correct Answer: 1

Identifiers in Scala are names given to -

1. Classes or objects
2. Methods
3. Objects
4. All of these

✅ Correct Answer: 4

Which of these is not a type of identifier -

1. Alphanumeric identifier
2. Operator identifier
3. Literal identifier
4. Value identifier

✅ Correct Answer: 4

Is the following identifier valid? 12Scala_3

1. Yes
2. No
3. Error
4. None of these

✅ Correct Answer: 2

Literal Identifier is -

1. String literal used as an identifier in Scala
2. Value literal used as an identifier in Scala
3. Numeric literal used as an identifier in Scala
4. None of These

✅ Correct Answer: 1

The correct output of the following code is - object myObject { def main(args: Array[String]) { var _value1 = 54 var 3value_2 = 65 println("The sum of two values is " + (_value1 + value_2)) } }

1. 54
2. Error
3. 119
4. 65

✅ Correct Answer: 2

Which variable in Scala can save memory while declaring variables?

1. Mutable variables
2. Lazy Variables
3. Inherited Variables
4. None of these

✅ Correct Answer: 2

How many types of operators are present in Scala?

1. 5
2. 2
3. 6
4. 8

✅ Correct Answer: 1

Logical operators in Scala are used to -

1. Perform a comparison of values
2. Perform logical operation on the boolean value
3. Return a value
4. None of These

✅ Correct Answer: 2

What is the use of the "&=" operator in Scala -

1. Bitwise operator
2. Arithmetic operator
3. Bitwise Assignment operator
4. None of these

✅ Correct Answer: 3

Find the result of the following code block - (3 + 4 * 5) >>> 1

1. 43
2. 11
3. 12
4. 120

✅ Correct Answer: 2

Relation operators are -

1. Return a relative value
2. Used to define the comparison between the two operators
3. Create new values based on the relation
4. None of These

✅ Correct Answer: 2

What is the symbolic operator in Scala?

1. Predefined sets that can handle a specific task
2. Are reserved to a specific use
3. Symbols that have a specific task that they perform when called in a Scala program
4. All of these

✅ Correct Answer: 4

The final keyword in Scala is used to -

1. Define a variable whose value cannot be further changed
2. Create a new variable
3. Special inaccessible value in Scala
4. None of these

✅ Correct Answer: 1

A final method can be applied on?

1. Variables
2. Classes
3. Functions
4. All of the above

✅ Correct Answer: 4

What is the scope of a local variable in Scala?

1. Whole program
2. A method is it declared in
3. Class/object containing it
4. All of the above

✅ Correct Answer: 2