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CLASS 10 ICSE JAVA COMPUTER APPLICATIONS SPECIMEN PAPER 2024 - 9
Maximum Marks:100
Time allowed: Two hours
Answers to this Paper must be written on the paper provided separately.
You will not be allowed to write during the first 15 minutes.
This time is to be spent in reading the question paper.
The time given at the head of this Paper is the time allowed for writing the answers.
This Paper is divided into two Sections.
Attempt all questions from Section A and any four questions from Section B.
Answers to this Paper must be written on the paper provided separately.
The intended marks for questions or parts of questions are given in brackets[] .
SECTION A
(Attempt all questions from this Section.)
Question 1
(i)
Name the feature of java depicted in the above picture.
(a) Encapsulation
(b) Inheritance
(c) Abstraction
(d) Polymorphism
(ii)
The expression which uses >= operator is known as:
(a) relational
(b) logical
(c) arithmetic
(d) assignment
(iii)
Ternary operator is a:
(a) logical operator
(b) arithmetic operator
(c) relational operator
(d) conditional operator
(iv)
When primitive data type is converted to a corresponding object of its class, it
is called:
(a) Boxing
(b) Unboxing
(c) explicit type conversion
(d) implicit type conversion
(v)
The number of bytes occupied by a character array of 10 elements.
(a) 20 bytes
(b) 60 bytes
(c) 40 bytes
(d) 120 bytes
(vi)
The method of Scanner class used to accept a double value is:
(a) nextInt()
(b) nextDouble()
(c) next()
(d) nextInteger()
(viii)
The output of Math.round(6.6) + Math.ceil(3.4) is:
(a) 9.0
(b) 11.0
(c) 10.0
(d) 11
(ix)
Name the type of error, if any in the following statement:
System.out.print("HELLO")
(a) logical
(b) no error
(c) runtime
(d) syntax
(x)
Java statement to access the 5th element of an array is:
(a) X[4]
(b) X[5]
(c) X[3]
(d) X[0]
(xi)
The output of “Remarkable”.substring(6) is:
(a) mark
(b) emark
(c) marka
(d) able
(xii)
Which of the following is the wrapper class for the data type char?
(a) String
(b) Char
(c) Character
(d) Float
(xiii)
Name the package that contains wrapper classes:
(a) java.lang
(b) java.util
(c) java.io
(d) java.awt
(xiv)
Constructor overloading follows which principle of Object Oriented
programming?
(a) Inheritance
(b) Polymorphism
(c) Abstraction
(d) Encapsulation
(xv)
Which of the following is a valid Integer constant:
1. 4
2. 4.0
3. 4.3f
4. “four”
(a) Only 1.
(b) 1. and 3.
(c) 2. and 4.
(d) 1. and 2.
(xvi)
The method compareTo() returns __________ when two strings are equal and
in lowercase :
(a) true
(b) 0
(c) 1
(d) false
(xvii)
Assertion(A): In java statements written in lower case letter or upper case letter
are treated as the same.
Reason(R): Java is a case sensitive language.
(a) Both Assertion (A) and Reason (R) are true and Reason (R) is a correct
explanation of Assertion (A)
(b) Both Assertion (A) and Reason (R) are true and Reason (R) is not a
correct explanation of Assertion(A)
(c) Assertion (A) is true and Reason (R) is false
(d) Assertion (A) is false and Reason (R) is true
(xviii)
Read the following text, and choose the correct answer:
A class encapsulate Data Members that contains the information necessary to
represent the class and Member methods that perform operations on the data
member.
What does a class encapsulate?
(a) Information and operation
(b) Data members and Member methods
(c) Data members and information
(d) Member methods and operation
(xix)
Assertion(A): call by value is known as pure method
Reason(R): The original value of variable does not change as operation is
performed on copied values.
(a) Both Assertion (A) and Reason (R) are true and Reason (R) is a correct
explanation of Assertion (A)
(b) Both Assertion (A) and Reason (R) are true and Reason (R) is not a
correct explanation of Assertion (A)
(c) Assertion (A) is false and Reason (R) is true
(d) Assertion (A) is false and Reason (R) is true
(xx)
What Will be the output for:
System.out.print
(Character.toLowerCase('1'));
(a) 0
(b) 1
(c) A
(d) true
(iii)
The following code segment should print “You can go out” if you have done
your homework (dh) and cleaned your room(cr). However, the code has errors.
Fix the code so that it compiles and runs correctly.
boolean dh = True;
boolean cr= true;
if (dh && cr)
System.out.println("You cannot go out");
else
System.out.println("You can go out");
Sam executes the following program segment and the answer displayed is zero
irrespective of any non zero values are given. Name the error. How the program
can be modified to get the correct answer?
void triangle(double b, double h)
{
double a;
a = ½ * b * h;
System.out.println(“Area=”+a);
}
(v)
How many times will the following loop execute? What value will be returned?
int x=2;
int y=50;
do{
++x;
y-=x++;
}
while(x<=10);
return y;
(vi)
Write the output of the following String methods:
(a) "ARTIFICIAL ".indexOf('I')
(b) “DOG and PUPPY”. trim().length()
(viii)
Predict the output of the following code snippet:
String a="20";
String b="23";
int p=Integer.parseInt(a);
int q=Integer.parseInt(b);
System.out.print(a+"*"+b);
(ix)
When there is no explicit initialization, what are the default values set for
variables in the following cases?
(a) Integer variable
(b) String variable
(x)
int P [ ]={ 12,14,16,18}; int Q[ ]={ 20,22,24};
Place all elements of P array and Q array in the array R one after the other.
(a) What will be the size of array R [ ] ?
(b) Write index position of first and last element?
SECTION B
(Attempt all questions from this Section.)
Question 3
Define a class called with the following specifications:
Class name: Eshop
Member variables:
String name: name of the item purchased
double price: Price of the item purchased
Member methods:
void accept(): Accept the name and the price of the item using the methods of Scanner
class.
void calculate(): To calculate the net amount to be paid by a customer, based on the
following criteria:
void display(): To display the name of the item and the net amount to be paid.
Write the main method to create an object and call the above methods.
void display(): To display the name of the item and the net amount to be paid.
Write the main method to create an object and call the above methods.
Question 4
Define a class to accept values in integer array of size 10. Sort them in an ascending order
using selection sort technique. Display the sorted array.
Question 5
Define a class to accept a string and convert it into uppercase. Count and display the
number of vowels in it.
Input: robotics
Output: ROBOTICS
Number of vowels: 3
Question 6
Define a class to accept values into a 3×3 array and check if it is a special array. An array
is a special array if the sum of the even elements = sum of the odd elements.
Example:
A[][]={{ 4 ,5, 6}, { 5 ,3, 2}, { 4, 2, 5}};
Sum of even elements = 4+6+2+4+2 =18
Sum of odd elements= 5+5+3+5=18
Question 7
Define a class to accept a 3 digit number and check whether it is a duck number or not.
Note: A number is a duck number if it has zero in it
Example1:
Input: 2083
Output: Invalid
Example 2:
Input: 103
Output: Duck number
Question 8