1
Which provides runtime environment for java byte code to be executed?
Correct Answer
JVM
☑ MCQ PRACTICE
Object Oriented Programming through Java Unit 1
Practice objective questions for quick revision and examination preparation. Try answering each question before revealing the answer.
Object Oriented Programming through Java - Unit-1
2
Which variables are created when an object is created with the use of the keyword 'new' and destroyed when the object is destroyed?
Correct Answer
Instance variables
3
Choose a Single Line Comment in Java Language below?
Correct Answer
//Some comments
4
A valid identifier in Java language may contain which characters?
Correct Answer
All the above
5
In Java, Multi-line comments are represented by _____________
Correct Answer
/* */
6
The Primitive data types in java are ____________________
Correct Answer
Pre-defined data types
7
Which of the following expression is an invalid?
Correct Answer
float 4d = 12.3f;
8
In java, The instance variable is declared ____________________.
Correct Answer
inside class but outside the method
9
A data type is converted into another data type by the programmer is known as ____________?
Correct Answer
Type Casting
10
Which one is true about a constructor?
Correct Answer
All of the above
11
What are the keywords used to implement a SWITCH case in Java language?
Correct Answer
All
12
Which of the following statement is invalid?
Correct Answer
for loop - if the number of iterations are not fixed
13
Which of the following array declaration is invalid?
Correct Answer
Datatype array_name[] = new DataType[];
14
Do you want to access the data members of a class, you have to create ___________?
Correct Answer
an object
15
In java, the String class comes under ___________ package?
Correct Answer
java.lang
16
In java, the System class comes under ___________ package?
Correct Answer
java.lang
17
In java, the Scanner class comes under ___________ package?
Correct Answer
java.util
18
In java, the Console class comes under ___________ package?
Correct Answer
java.io
19
Which of these is an incorrect Statement?
Correct Answer
None of the mentioned
20
In a .java file, how many numbers of public types namely class, interface or abstract can be managed?
Correct Answer
1
21
Java method overloading implements the OOPS concept ___.
Correct Answer
Polymorphism
Fill in the Blanks
22
To successfully overload a method in Java, the argument-list or parameter-list must be ___. (Same/Different)
Correct Answer
Different
23
A local variable declared inside a method can not be used in expressions without initializing it first. (TRUE / FALSE).
Correct Answer
TRUE
24
In Java, an array can be declared without initialization without mentioning the size. (True / False)
Correct Answer
A
25
State TRUE or FALSE. An ELSE or ELSE-IF statement in Java can not exist alone without IF statement. (FALSE / TRUE).
Correct Answer
TRUE