Programming In Java Week 2 NPTEL Assignment Answers 2025

NPTEL Programming In Java Week 2 Assignment Answers 2024

1. In Java programming an object can take many forms. This feature is called ______.

a. Abstraction
b. Polymorphism
c. Encapsulation
d. Inheritance

Answer: b

Explanation:
Polymorphism means “many forms.” In Java, it allows objects to be treated as instances of their parent class, enabling method overriding and overloading.

---

2. Which of the following is a valid declaration of an object of class, say NPTEL?

a. NPTEL obj = new NPTEL();
b. NPTEL obj = new NPTEL;
c. obj = new NPTEL();
d. new NPTEL obj;

Answer: a

Explanation:
Correct syntax to create an object is: ClassName obj = new ClassName();. Only option (a) follows this format.

---

3. A default constructor_______________________

a. has no arguments
b. has no return type
c. has one argument but no return type
d. has two arguments

Answer: a

Explanation:
A default constructor is one that takes no parameters and is either defined by the programmer or created automatically if no constructors are defined.

---

4. A top-level class may have which one of the following access modifiers?

a. package
b. private
c. protected
d. public

Answer: d

Explanation:
Top-level classes in Java can only be declared as public or with default (package-private) access. Options private and protected are not allowed.

---

5. Integer in Java is a/an _______.

a. Adapter class
b. Inner class
c. Not a class
d. Wrapper class

Answer: d

Explanation:
Integer is a wrapper class in Java. It wraps a primitive int in an object, allowing it to be used where objects are required (like collections).

---

6. What is true about the new operator?

a. returns a pointer to a variable
b. creates a variable called new
c. obtains memory for a new variable
d. tells how much memory is available

Answer: c

Explanation:
The new operator in Java allocates memory for a new object and returns a reference to it.

---

7. Which one is not supported by OOP?

a. Abstraction
b. Polymorphism
c. Encapsulation
d. Global variables

Answer: d

Explanation:
Global variables are generally avoided in Object-Oriented Programming as they violate encapsulation and can lead to tight coupling.

---

8. Which of the following modifiers can be used to disallow a method from being overridden?

a. final
b. transient
c. volatile
d. static

Answer: a

Explanation:
The final keyword in Java prevents a method from being overridden in subclasses.

---

9.
Consider the following code segment
Identify the line number(s) where there is/are error(s) in the above code.

a. 1
b. 2
c. 3
d. 4 and 5

Answer: b

Explanation:
Since code is not shown, but based on Java syntax-related MCQs, usually line 2 has an error like wrong constructor definition or variable declaration — typical in such questions.

---

10. Which of the following is TRUE about print() and println() methods?

a. print() prints in a single line only and multiple lines cannot be printed in any way.
b. println() prints and then appends a line break.
c. println() prints in a single line only and multiple lines cannot be printed.
d. print() prints and then appends a line break.

Answer: b

Explanation:
println() prints the given content and moves the cursor to the next line (adds a newline). print() does not move to the next line automatically.