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Test your understanding of Java basics with this MCQ practice set 4

1.

Constructor can be:

abstract

final

overloaded

static

None

2.

Which keyword declares exception?

throws

throw

final

catch

None

3.

Which is NOT Java keyword?

final

delete

static

goto

None

4.

What is the size of boolean in Java?

1 bit

Depends on JVM

1 byte

Not defined

None

5.

Which conversion is implicit?

float → int

int → double

long → short

double → int

None

6.

Which is not primitive?

boolean

int

char

String

None

7.

Which keyword prevents overriding?

private

final

static

abstract

None

8.

Which block always executes?

catch

finally

try

throw

None

9.

What is the range of byte?

-256 to 255

-127 to 128

0 to 255

-128 to 127

None

10.

Which concept allows code reuse?

Inheritance

Encapsulation

Abstraction

Polymorphism

None

11.

What happens if main() method is not static?

Compile error

Program runs

Runtime error

Infinite loop

None

12.

Which is checked exception?

IOException

ArithmeticException

NullPointerException

ArrayIndexOutOfBoundsException

None

13.

what is the output?

try{
int x=10/0;
}catch(Exception e){
System.out.print(“X”);
}

Error

X

0

Crash

None

14.

Which is wrapper class of int?

Double

Number

Integer

Int

None

15.

Which of the following is NOT part of JRE?

Compiler

Runtime environment

Class Libraries

JVM

None

16.

Which is compile-time polymorphism?

Overloading

Inheritance

Abstraction

Overriding

None

17.

What is the output?

int x = (int)5.99;
System.out.println(x);

5

6

5.99

Error

None

18.

What is the output?

int x = 10;
double y = x;
System.out.println(y);

10

Error

10.0

null

None

19.

Which package contains Scanner class?

java.net

java.util

java.io

java.lang

None

20.

Which is correct?

float x = “5.5”;

float x = 5,5;

float x = 5.5;

float x = 5.5f;

None

Time’s up

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