Solved Sample Paper 3

Question 1(i)

What will be the output of the following code?

int size = 2;
if (size < 0)
    System.out.println("Small"); 
else if (size == 0)
    System.out.println("Medium");
else
    System.out.println("Large");

1. Small
2. Large
3. Medium
4. Runtime error

Question 1(ii)

Which of the following statements involves a fall through?

1. if-else
2. for loop
3. if-else-if
4. switch

Question 1(iii)

Which of the following statement is true for logical errors?

1. The compiler does not detect these errors.
2. There is no indication of error when the program is executed.
3. The program may produce correct results for some input data and wrong results for other input data.
4. All of the above

Question 1(iv)

Object oriented programming mainly uses

1. top down approach
2. top down and bottom up approach
3. bottom up approach
4. None of the above

Question 1(v)

In which technique are the values of actual parameters copied to the formal parameters?

1. Call by reference
2. Call by value
3. Call by argument
4. Call by method

Question 1(vi)

Which package would you import for the Scanner class?

1. java.util.*;
2. java.awt.*;
3. java.io.*;
4. java.lang.*;

Question 1(vii)

Give the output of Math.abs(x); when x = -9.99.

1. -9.99
2. 9.99
3. 0.99
4. None of these

Question 1(viii)

A/An ............... is an abstract description of a set of objects.

1. abstraction
2. encapsulation
3. polymorphism
4. class

Question 1(ix)

This variable can be accessed by calling with the class name.

1. Instance
2. Local
3. Class
4. None of these

Question 1(x)

The main objective of passing arguments to functions is

1. message passing
2. parameter passing
3. variable passing
4. argument passing

Question 1(xi)

If int arr [] = {3, 5, 7, 9}; what is the value of arr.length?

1. 3
2. 5
3. 4
4. Cannot be determined

Question 1(xii)

A binary search

1. can be used with sorted arrays only.
2. can be used with unsorted arrays only.
3. can be used with both sorted and unsorted arrays.
4. cannot be used with arrays.

Question 1(xiii)

Corresponding wrapper class of float data type is

1. FLOAT
2. float
3. Float
4. Floating

Question 1(xiv)

What will be the output of the following code?

System.out.println("Lucknow".substring (0, 4));

1. Lucknow
2. Luckn
3. Luck
4. luck

Question 1(xv)

This access specifier is the most open access level.

1. Public
2. Protected
3. Private
4. Default

Question 1(xvi)

The method to determine whether the specified char value is in uppercase or not.

1. toUpperCase(char)
2. toLowerCase(char)
3. isLowerCase(char)
4. isUpperCase(char)

Question 1(xvii)

Assertion (A) Method should be called explicitly either with object reference or class reference.
Reason (R) Method can be any user defined name.

1. Both Assertion (A) and Reason (R) are true and Reason (R) is a correct explanation of Assertion (A).
2. Both Assertion (A) and Reason (R) are true and Reason (R) is not a correct explanation of Assertion (A).
3. Assertion (A) is true and Reason (R) is false.
4. Assertion (A) is false and Reason (R) is true.

Question 1(xviii)

Read the following text and choose the correct answer:

Public access specifier allows a class to expose its member variables and member functions to other functions and objects. Any public member can be accessed from outside the class.

Which of these access specifier must be used for class so that it can be inherited by another subclass?

1. public
2. private
3. protected
4. none of the mentioned

Question 1(xix)

Assertion (A) The return statement causes program control to transfer back to the caller of the method.
Reason (R) The return statement immediately terminates the method in which it is executed.

1. Both Assertion (A) and Reason (R) are true and Reason (R) is a correct explanation of Assertion (A).
2. Both Assertion (A) and Reason (R) are true and Reason (R) is not a correct explanation of Assertion (A).
3. Assertion (A) is true and Reason (R) is false.
4. Assertion (A) is false and Reason (R) is true

Question 1(xx)

Correct statement to declare an integer array of 10 elements.

1. int[ ] arr = new int[10];
2. int arr;
3. int arr (10);
4. int ( ) arr = new int (10);

Question 2(i)

Write the values of r and s after the execution of the following code.

int p = 11, q = 21, r, s; 
r = ++q;
s = p++; 
r++;

Question 2(ii)

Observe the following code and find that how many times will the loop execute?

int sum = 0, score = 0;
double t;
do
{
    score = score + 1; 
    sum = sum + score;
} while(score <= 3);
t = sum / 3;

Question 2(iii)

Write the Java statement for the following mathematical expression

$p = \dfrac{a}{b^2} + \dfrac{b}{a^2}$

Question 2(iv)

If a = 8, find the value of a -= ++a + a++ + 4 - a + 6.

Question 2(v)

Rewrite the following code using for loop.

int i = 1; 
int d = 5; 
do
{
    d = d * 2;
    System.out.println(d); 
    i++;
} while(i <= 5);

Question 2(vi)

Name the operators listed below.

1. ?:
2. &&
3. <=
4. ++

Question 2(vii)

Find out the error(s) in the following code and underlining correct error(s).

int m = 5; n = 10; 
while(n >= 1)
{
    System.out.print("m");
    n--;
}

Question 2(viii)

Evaluate the following expressions, when int a = 8, b = 14.

(a) b/a++

(b) --a + b-- + a

Question 2(ix)

Write the syntax of switch statement.

Question 2(x)

What will be the output of the following program segment?

int a = 100; 
while(false)
{
    if(a < 50)
        break; 
    a = a - 10;
}
System.out.println(a);

Question 3

Define a class with the following specifications

Class name : employee

Member variables
eno : employee number
ename : name of the employee
age : age of the employee
basic : basic salary (Declare the variables using appropriate data types)

Member methods
void accept( ) : accept the details using scanner class
void calculate( ) : to calculate the net salary as per the given specifications

net = basic + hra + da - pf
hra = 18.5% of basic
da = 17.45% of basic
pf = 8.10% of basic

if the age of the employee is above 50 he/she gets an additional allowance of ₹5000

void print( ) : to print the details as per the following format

eno ename age basic net

void main( ) : to create an object of the class and invoke the methods

import java.util.Scanner;

public class employee
{
    private int eno;
    private String ename;
    private int age;
    private double basic;
    private double net;
    
    public void accept() 
    {
        Scanner in = new Scanner(System.in);
        System.out.print("Enter name : ");
        ename = in.nextLine();
        System.out.print("Enter employee no : ");
        eno = in.nextInt();
        System.out.print("Enter age : ");
        age = in.nextInt();
        System.out.print("Enter basic salary : ");
        basic = in.nextDouble();
    }
    public void calculate()
    {
        double hra, da, pf;
        hra = 18.5/100.0 * basic;
        da = 17.45/100.0 * basic;
        pf = 8.10/100.0 * basic;
        net = basic + hra + da - pf;
        if(age > 50)
            net += 5000;
    }
    
    public void print()
    {
        System.out.println(eno + "\t" + ename + "\t" + age + "\t Rs."
        + basic + "\t Rs." + net );
    }
    
    public static void main(String args[])
    {
        employee ob = new employee();
        ob.accept();
        ob.calculate();
        ob.print();
    }
}

Output

Question 4

Define a class to accept the elements of an array from the user and check for the occurrence of positive number, negative number and zero.

Example

Input Array: 12, -89, -56, 0, 45, 56

Output:
3 Positive Numbers
2 Negative Numbers
1 Zero

import java.util.Scanner;

public class KboatSDANumbers
{
    public static void main(String args[]) {
        Scanner in = new Scanner(System.in);
        int pc = 0;
        int nc = 0;
        int zc = 0;
        
        System.out.print("Enter size of array : ");
        int l = in.nextInt();
        int arr[ ] = new int[l];
        
        System.out.println("Enter array elements : ");
        for (int i = 0; i < l; i++) {
            arr[i] = in.nextInt();
        }
        
        for (int i = 0; i < l; i++) {
            if (arr[i] < 0)
                nc++;
            else if(arr[i] > 0)
                pc++;
            else
                zc++;
        }
        
        System.out.println(pc + " Positive Numbers");
        System.out.println(nc + " Negative Numbers");
        System.out.println(zc + " Zero");
    }
}

Output

Question 5

Define a class Anagram to accept two words from the user and check whether they are anagram of each other or not.
An anagram of a word is another word that contains the same characters, only the order of characters is different.
For example, NOTE and TONE are anagram of each other.

import java.util.Scanner;

public class Anagram
{
    public static void main(String args[]) {
        Scanner in = new Scanner(System.in);
        System.out.println("Enter the 2 words to check");
        System.out.print("Enter first word: ");
        String str1 = in.next();
        System.out.print("Enter second word: ");
        String str2 = in.next();
        boolean isAnagram = true;

        String s1 = str1.toLowerCase();
        String s2 = str2.toLowerCase();
        int l1 = s1.length();
        int l2 = s2.length();

        if (l1 != l2) {
            isAnagram = false;
        }
        else {
            int count[] = new int[26];
            for (int i = 0; i < l1; i++) {
                count[s1.charAt(i) - 97]++;
                count[s2.charAt(i) - 97]--;
            }

            for (int i = 0; i < count.length; i++) {
                if (count[i] != 0) {
                    isAnagram = false;
                    break;
                }
            }
        }

        if (isAnagram)
            System.out.println("Anagram");
        else
            System.out.println("Not Anagram");
    }
}

Output

Question 6

Define a class to accept a number and check whether the number is valid number or not. A valid number is a number in which the eventual sum of digits of the number is equal to 1.

e.g., 352 = 3 + 5 + 2 = 10 = 1 + 0 = 1

Then 352 is a valid number.

import java.util.Scanner;

public class KboatValidNum
{

    public static void main(String args[]) {

        Scanner in = new Scanner(System.in);
        System.out.print("Enter number : ");
        int num = in.nextInt();
        int n = num;

        while (n > 9) {
            int sum = 0;
            while (n != 0) {
                int d = n % 10;
                n /= 10;
                sum += d;
            }
            n = sum;
        }

        if (n == 1)
            System.out.println(num + " is Valid Number");
        else
            System.out.println(num + " is not Valid Number");

    }
}

Output

Question 7

Write the code to print following patterns

(i)

1
2 6
3 7 10
4 8 11 13
5 9 12 14 15

(ii)

A A A A A 
A A A B B
A A C C C 
A D D D D 
E E E E E

public class KboatPattern
{
    public static void main(String args[]) {
        System.out.println("Pattern 1");
        for (int i = 1; i <= 5; i++) {
            int x = 4;
            System.out.print(i + " ");
            int t = i;
            for (int j = 1; j < i; j++) {
                t += x;
                System.out.print(t + " ");
                x--;
            }
            
            System.out.println();
        }
        
        System.out.println();
        
        System.out.println("Pattern 2");
        char ch = 'A';
        for (int i = 1; i <= 5; i++) {
            
            for (int j = 4; j >= i; j--) {
                System.out.print("A ");
            }
            
            for (int k = 1; k <= i; k++) {
                System.out.print(ch + " ");
            }
            
            System.out.println();
            ch++;
        }
    }
}

Output

Question 8

Write a program to accept name and total marks of N number of students in two single subscript array name[ ] and totalmarks[ ].

Calculate and print :

(i) The average of the total marks obtained by N number of students.
[average = (sum of total marks of all the students)/N]

(ii) Deviation of each student's total marks with the average.
[deviation = total marks of a student­ - average]

import java.util.Scanner;

public class KboatSDAMarks
{
    public static void main(String args[]) {
        Scanner in = new Scanner(System.in);
        System.out.print("Enter number of students: ");
        int n = in.nextInt();
        
        String name[] = new String[n];
        int totalmarks[] = new int[n];
        int grandTotal = 0;
        
        for (int i = 0; i < n; i++) {
            in.nextLine();
            System.out.print("Enter name of student " + (i+1) + ": ");
            name[i] = in.nextLine();
            System.out.print("Enter total marks of student " + (i+1) + ": ");
            totalmarks[i] = in.nextInt();
            grandTotal += totalmarks[i];
        }
        
        double avg = grandTotal / (double)n;
        System.out.println("Average = " + avg);
        
        for (int i = 0; i < n; i++) {
            System.out.println("Deviation for " + name[i] + " = " 
            + (totalmarks[i] - avg));
        }
    }
}

Output