Java Programs - Solved 2024 ICSE Computer Science Specimen Paper

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Solved 2024 ICSE Computer Science Specimen Paper

Class 10 - ICSE Computer Science Solved Specimen Papers

Short Questions/Answers - ICSE 2024 Computer Science Specimen Paper

Question 1
Choose the correct answers to the questions from the given options.
(Do not copy the question, write the correct answers only)

(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()

(vii) Among the following which is a keyword?
(a) every
(b) all
(c) case
(d) each

(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 5^th 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 lowercase letter or uppercase 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 true and Reason (R) is false
(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

Question 2

(i) Write the Java expression for (p + q)2.
Math.pow(p + q, 2)

(ii) Evaluate the expression when the value of x = 2.
x = x++ + ++x + x;
x = 2 + 4 + 4
x = 6 + 4
x = 10

(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”);

boolean dh = true;
boolean cr = true;
if(dh && cr)
System.out.println(“You can go out”);
else
System.out.println(“You cannot go out”);

(iv) Sam executes the following program segment and the answer displayed is zero irrespective of any non-zero values given. Name the error. How the program can be modified to get the correct answer?
void triangle(double b, double h){
double a;
a = 1 / 2 * b * h;
System.out.println(“Area = ” + a);
}

It is a logical error.
void triangle(double b, double h){
double a;
a = 1.0 / 2 * 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;

The loop executes 5 times.
15 will be returned.

(vi) Write the output of the following String methods:
(a) “ARTIFICIAL”.indexOf(‘I’)
3
(b) “DOG and PUPPY”.trim().length()
13

(vii) Name any two jump statements.
break and continue

(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);

20*23

(ix) When there is no explicit initialization, what are the default values set for variables in the following cases?
(a) Integer variable
0

(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[]?
Size = 7

(b) Write index position of first and last element.
Index of first element = 0
Index of last element = 6