Programming in Java | NPTEL 2023 | Week 2 quiz solutions

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Programming in Java NPTEL 2022 Week 2 Quiz Solutions

Q1. Consider the following code segment:

1 class Question{
2   public static void main(String args){
3       System.out.print("Welcome to NPTEL");
4   }
5 }

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

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Q2. Consider the following code segment:

1  class Question{
2      public static void main(String[] param){
3          System.out.print("Welcome to NPTEL");}}
4      }
5  }

Identify the line number(s) where there is error in the above code.

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

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Q3. Consider the following code segment:

class Question{
    public static void main(String args[]){
        for(int n=1; n<=10; n++){
            System.out.print(n + " ");
        }
    }
}

Select the correct output description for the above code.

a) Prints first n natural numbers in a single line.
b) Prints first n natural numbers, one number in a single line.
c) Prints first 10 natural numbers in a single line.
d) Prints first 10 natural numbers in a single line with no spaces.

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Q4. Consider the following code segment:

1 class Question{
2    public static void main(String args[]){
3        for(int n=1; n<=100; n++){
4            System.out.print(n + " ");
5        }
6    }
7 }

Modify the above code such that it prints all the even numbers till 100.

a) Replace line 3 with for(int n=2; n<=100; n++)
b) Replace line 3 with for(int n=1; n<=100; n+=2){
c) Replace line 4 with System.out.print(++n + ” “);
d) Both option a and c

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Q5. What will be the output of the above program?

a) 22221018
b) 22222018
c) 22101018
d) 22221218

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Q6. How to correct the above code segment?

a) Change line 4 as x = (short) (x * 5);
b) Change line 4 as x = (short) x * 5;
c) Change line 4 as x = (short) x * (short) 5;
d) Change line 4 as (short) x = x * 5;

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Q7. What is the output of the following program?

a) 210
b) 120
c) 012
d) 000

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Q8. Which of the following option is the output of the above program?

a) java
b) npteljava
c) nptel java
d) nptel

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Q9. What is the output of the following program?

a) 60
b) 117
c) 33
d) Compilation error

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Q10. What will be the output of the program if it is executed?

a) 50
b) 10
c) Compiler error
d) 5

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Programming in Java NPTEL 2023 Week 2 Quiz Solutions

Q1. Following is a program given for this question.
What will be the output of the above program?

a) 22221010
b) 12222101
c) 22101010
d) 22221012

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Q2. When an array is passed to a method, what value does the method receive?

a) Reference of the array
b) Copy of the array
c) First element in the array
d) Length of the array

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Q3. What will be the output of the above program?

a) 28
b) -29
c) 30
d) -31

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Q4. How many bits are needed for float and double in Java, respectively?

a) 32 and 64
b) 32 and 32
c) 64 and 64
d) 64 and 32

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Q5. Which of the following is a valid automatic type conversion in Java?

a) short to byte
b) float to long
c) int to short
d) int to long

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Q6. Consider the following program and identify the output.

a) 5
b) 10
c) 50
d) Compilation error

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Q7. Which of the following is a valid declaration of an object of class say, Student?

a) Student obj = new Student;
b) Student obj = new Student();
c) obj = new Student();
d) new Student obj;

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Q8. What is the output of the following program?

a) 210
b) 120
c) 012
d) 201

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Q9. Which of the following option is the output of the above program?

a) java
b) npteljava
c) nptel java
d) nptel

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Q10. What is the output of the following program?

a) 60
b) 3011
c) 33
d) Compilation error

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Programming in Java NPTEL 2022 Week 2 Quiz Solutions

Q1. What is the output of the following program?

public class Main {
    public static void main(String args[]) {
           char a = '8';
           int b = 010;
           System.out.println(a+b);
    }
}

a) 88
b) 8010
c) 64
d) 810

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Q2. Which of the following is generate API documentation in HTML format from Java source code?

a) javac
b) javadoc
c) javap
d) java

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Q3. Following is a program given for this question.

public class Main{
     public static void main(String[] args) {
        char[] copyFrom = { 'j', 'a', 'n', 'n', 'p', 't', 'e', 'l', 'j', 'a', 'v', 'a',};
        char[] copyTo = new char[9];

        System.arraycopy(copyFrom, 3, copyTo, 0, 9);
     }
}

What will be the output of the above program?

a) javanptel
b) npteljava
c) janjavanptel
d) jannpteljava

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Q4. What will happen during the execution of the following code for the command line input?

public class Question {
     public static void main (String[] args) {
         for (String s: args) {
             System.out.println(s+args[0]);
         }
     }
}

Consider the following input on command line and select the options with the correct output(s).

Input:
A: “jan java nptel”
B: 1 2 3

a) A : jannptel
javanptel
nptelnptel
b) A : jan java nptel jan java nptel
c) B : 11
21
31
d) B : 1 2 3 1

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Q5. Which of the following is/are TRUE about print() and println() methods?

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

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Programming in Java NPTEL 2022 Week 2 quiz Solutions

Q6. What was the initial name of Java when it was first developed for embedded systems?

a) Greentalk
b) Oak
c) Java
d) Javac

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Q7. Which of the following is a valid declaration of an object of class, say Foo?

a) Foo obj = new Foo;
b) obj = new Foo();
c) Foo obj = new Foo();
d) new Foo obj;

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Programming in Java NPTEL 2022 Week 2 Quiz solutions

Q8. Following is a program given for this question.

public class Question
{
     public static void main(String[] args) {
         
       boolean m = Integer.valueOf(0).equals(Long.valueOf(1));
       System.out.println(m);
    }
}

What will be the output of the above program?

a) 0
b) 1
c) false
d) true

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Q9. Which of the following can be used to take input from user during the execution of a program?

a) Using the string array provided as a parameter to the main method.
b) getText() method can be used to get user input from the command line.
c) Scanner class can be used by passing the predefined object System.in
d) Once the execution starts, there is no way to provide user input.

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Q10. What is the output of the following program?

public class Question
{
     public static void main(String[] args) {
         
          int i = 10;
          int n = i++%2;
          int m = ++i%7;
          System.out.println(i+n+m);
     }
}

a) 14
b) 12
c) 15
d) 17

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