Olete.in – MCQs, Mock Tests & Government Job Prep | Scala framework Scala Multiple-Choice Questions Set 2

The output of the following block of code is - class Student{ var roll = 43; def printTotal(){ var totalMarks = 500 println(roll) } } object MyClass{ def main(args:Array[String]) { var s1 = new Student println(s1.totalMarks) } }

1. 500
2. 300
3. Error
4. None of these

✅ Correct Answer: 3

Which is valid to method to increase value of variable by one?

1. a++
2. ++a
3. a += 1
4. All of these

✅ Correct Answer: 3

The output of the following code is - object MyClass{ def main(args:Array[String]) { var a = 43 a += 4 a -= 3 println(a) } }

1. 43
2. 44
3. 45
4. None of these

✅ Correct Answer: 2

Ignored variables are used to -

1. Create variables without using names
2. Create blank value variable
3. Both A and B
4. None of these

✅ Correct Answer: 1

Wildcard patterns (_) is used to -

1. Create variables
2. Create new unmatched patterns
3. Match the unmatched case
4. None of these

✅ Correct Answer: 3

The following code statement will - import java.util._

1. import _ method from util library
2. Error
3. Import all methods from java.util library
4. None of these

✅ Correct Answer: 3

What are expressions in Scala?

1. Line of code that compiles to a value
2. Code block without semicolon
3. Line of code containing = sign
4. None of these

✅ Correct Answer: 1

Conditional statement in Scala executes a block of code based on some conditional value?

1. True
2. False
3. Error
4. None of These

✅ Correct Answer: 1

Which of these is not a conditional statement in Scala?

1. if statement
2. if-else statement
3. This statement
4. None of these

✅ Correct Answer: 3

The output of the code block of code is - var myNumber = 5 ; if(myNumber > 20) print("A"); else if(myNumber > 15) print("B"); else print("C");

1. A
2. B
3. C
4. None of These

✅ Correct Answer: 3

The do-while loop in Scala is -

1. Iteration control Loop
2. Entry control loop
3. Exit control loop
4. None of These

✅ Correct Answer: 3

The for loop in Scala is -

1. Iteration control loop
2. Entry control loop
3. Exit control loop
4. None of These

✅ Correct Answer: 1

The output of the following block of code is - var myVar = 12; print(myVar); while(myVar <= 10){ print("*"); myVar += 2; }

1. 12
2. 12****
3. 12*
4. None of These

✅ Correct Answer: 1

2-D structures in Scala can be looped using -

1. Nested Loop
2. Structure
3. Collection iteration
4. None of these

✅ Correct Answer: 1

Output of the following block of code - for(i <- 1 to 2){ for(j <- 1 to 2) print("(" + i + "," + j + ") ") }

1. (1,1) (1,1) (1,1) (1,1)
2. (1,1) (1,2) (2,1) (2,2)
3. (1,1) (2,2) (1,1) (2,2)
4. None of these

✅ Correct Answer: 2

The break statement in Scala is imported using -

1. import scala.util.control._
2. import scala.break
3. import control
4. None of these

✅ Correct Answer: 3

Yield in Scala is used to -

1. Returns the resultant value of for loop
2. Stores a variable at each for loop iteration
3. Used with for loop
4. All of the above

✅ Correct Answer: 4

Can there be multiple counters in a for loop in Scala?

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

✅ Correct Answer: 1

To create a loop breakable in Scala, do we need to enclose it?

1. break
2. loop.breakable
3. breaks
4. None of these

✅ Correct Answer: 2

The default parameters are used when -

1. No parameter is passed
2. The extra parameter is passed
3. Always when the function is called
4. None of These

✅ Correct Answer: 1

The output of the following block of code is - object Demo { def welcome( a: Int = 54, b: Int = 21 ){ println(a + b); } def main(args: Array[String]) { welcome(5); } }

1. 75
2. 59
3. 26
4. 10

✅ Correct Answer: 3

Recursion function is -

1. A function that calls itself multiple times
2. Has a loop statement
3. All of these
4. None of These

✅ Correct Answer: 1

Which of these can be solved using recursion?

1. Factorial
2. Fibonacci
3. Both A and B
4. None of these

✅ Correct Answer: 3

Method overloading in Scala is?

1. Creating multiple methods performing the same task
2. Redefining methods in different ways under the same name
3. Creating methods differently
4. All of these

✅ Correct Answer: 2

def datatype(x:Float){ println("The parameter is of Float data type") } def datatype(x:Char){ println("The parameter is of Character data type") } def datatype(x: Boolean){ println("The parameter is of Boolean data type") } def main(args: Array[String]) { datatype(4.0f) } }

1. The parameter is of Boolean data type
2. The parameter is of Integer data type
3. The parameter is of Character data type
4. The parameter is of Float data type

✅ Correct Answer: 4

Which statement in Scala is used to create a tail-recursive function -

1. @newtailRec
2. @tailRecFunc
3. @tailRec
4. @tailrec

✅ Correct Answer: 4

Tail recursion in Scala is -

1. Initiated from last
2. Initiated from the first call
3. both (a) and (b)
4. None of These

✅ Correct Answer: 1

What is the maximum number of parameters a method can accept?

1. 32
2. 64
3. 128
4. 255

✅ Correct Answer: 4

Which syntax to pass the variable argument to function in Scala?

1. (int a, int b, int c, ….)
2. (a : Int, b : Int, c:Int, …)
3. (args: String*)
4. None of these

✅ Correct Answer: 3

Can you alter the sequence of parameter passing?

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

✅ Correct Answer: 1

The output of the following block of code is - object Demo { def sub( a:Int, b:Int ) = { println( (a-b) ); } def main(args: Array[String]) { sub(b = 5, a = 7); } }

1. -2
2. 2
3. Error
4. None of these

✅ Correct Answer: 2

Closures in Scala are -

1. Functions that return multiple values
2. Functions that can accept variable arguments
3. Functions that use a value from outside of the function's body
4. None of the above

✅ Correct Answer: 3

The output of the following block of code will be - object myObject { var multiplier = 5; def main(args: Array[String]) { println(calculator(45)); } val calculator = (i:Int) => i * multiplier; }

1. 45
2. 5
3. Error
4. 225

✅ Correct Answer: 4

Which of these parts of the declaration are not required in the case of parameter less methods?

1. def keyword
2. Return type
3. Parenthesis ()
4. All of the above

✅ Correct Answer: 4

Which of these ways of invoking a method are valid in Scala?

1. Using . operator
2. Using direct name call by other methods of the same class
3. Using inheritance
4. All of the above

✅ Correct Answer: 4

Lambda expression stores the value of -

1. Variable
2. Constant
3. Function
4. None of These

✅ Correct Answer: 3

Can Lambda expressions be used on collections in Scala?

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

✅ Correct Answer: 1

Ways to define a composite function in Scala are -

1. Compose keyword
2. andthen keyword
3. Passing method to another method
4. All of the above

✅ Correct Answer: 4

What is the output of the following block of code - object myObject { def main(args: Array[String]) { println(( div(mul(452)) )) } val mul = (a: Int)=> { a * 100 } val div = (a: Int) =>{ a / 500 } }

1. 45200
2. 0
3. 90
4. Error

✅ Correct Answer: 3

What is the chopping of string -

1. Divide the string into two equal halves
2. Strip off new line characters
3. Extract substring from a given index
4. None of these

✅ Correct Answer: 2

Unit value in Scala is -

1. Used as a return statement when no value is returned to it.
2. The function automatically returns a unit value when no value is returned.
3. Returned using Unit keyword
4. All of these

✅ Correct Answer: 4

Array in Scala is -

1. A primary data type
2. Stream of data from I/O
3. Linear data structure with a fixed number of elements
4. All of the above

✅ Correct Answer: 3

Which Scala keyword is used to create an array?

1. Arr
2. array
3. Array
4. All of the above

✅ Correct Answer: 3

Correct syntax for creating an array in Scala -

1. var array_name : Array[data_type] = new Array[data_type(size)
2. var array_name: Array[data_tpye] = new Array(size)
3. var array_name = Array(element1, elmenet2, element3, ...)
4. All of the above

✅ Correct Answer: 4

Is array mutable in Scala?

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

✅ Correct Answer: 2

How to create a mutable array in Scala?

1. Initializing using the var keyword
2. Using arrayBuffer
3. Adding mutable before initialization
4. All of the above

✅ Correct Answer: 2

Methods which can be used to remove/ delete users from arrayBuffer in Scala?

1. arrayBuffer.remove()
2. arrayBuffer.delete()
3. arrayBuffer.push()
4. All of the above

✅ Correct Answer: 1

Method used to get the length of array in Scala -

1. Array.len
2. length(arr)
3. arr.size
4. sizeof(arr)

✅ Correct Answer: 3

List in Scala is -

1. Primary data structure
2. The collection that stores data as a string
3. A collection that stores data in the form of a linked-list
4. None of these

✅ Correct Answer: 3

Method used to check if a list is empty in Scala -

1. list.isEmpty
2. list.isNull
3. list.empty
4. None of These

✅ Correct Answer: 1