Question 1

Question 1(i)Name the feature of java depicted in the below picture.EncapsulationInheritanceAbstractionPolymorphism

Accepted Answer

InheritanceReason — The given picture shows the relationship of a parent (father) and child. Just like a child inherits some characteristics from his parents, inheritance enables new classes (derived class) to receive or inherit the properties and methods of existing classes (base class).

Question 2

Question 1(ii)The expression which uses >= operator is known as:relationallogicalarithmeticassignment

Accepted Answer

relationalReason — Relational expressions are constructed using relational operators — equal to ( == ), not equal to ( != ), less than ( < ), less than equal to ( <= ), greater than ( > ), greater than equal to ( >= )

Question 3

Question 1(iii)Ternary operator is a:logical operatorarithmetic operatorrelational operatorconditional operator

Accepted Answer

conditional operatorReason — Ternary operator is a conditional operator as it evaluates the given condition. Its syntax is as follows:condition? expression 1 : expression 2If the condition is true then result of ternary operator is the value of expression 1. Otherwise the result is the value of expression 2.

Question 4

Question 1(iv)When primitive data type is converted to a corresponding object of its class, it is called:BoxingUnboxingexplicit type conversionimplicit type conversion

Accepted Answer

BoxingReason — Boxing is the conversion of primitive data type into an object of its corresponding wrapper class.

Question 5

Question 1(v)The number of bytes occupied by a character array of 10 elements.20 bytes60 bytes40 bytes120 bytes

Accepted Answer

20 bytesReason — A char data type occupies '2' bytes in the memory. Thus, 10 char type elements occupy (10 x 2) = 20 bytes in memory.

Question 6

Question 1(vi)The method of Scanner class used to accept a double value is:nextInt()nextDouble()next()nextInteger()

Accepted Answer

nextDouble()Reason — The nextDouble() function reads the next token entered by the user as a double value.

Question 7

Question 1(vii)Among the following which is a keyword:everyallcaseeach

Accepted Answer

caseReason — case is a keyword. It is used to define switch case construct.

Question 8

Question 1(viii)The output of Math.round(6.6) + Math.ceil(3.4) is:9.011.010.011

Accepted Answer

11.0Reason — The given expression is evaluated as follows:Math.round(6.6) + Math.ceil(3.4)⇒ 7 + 4.0⇒ 11.0Math.round() rounds off its argument to the nearest mathematical integer and returns its value as an int or long type. Math.ceil method returns the smallest double value that is greater than or equal to the argument and is equal to a mathematical integer. In the addition operation, the type of result is promoted to a double as one operand is double. Hence, the result is 11.0.

Question 9

Question 1(ix)Name the type of error, if any in the following statement:System.out.print("HELLO")logicalno errorruntimesyntax

Accepted Answer

syntaxReason — The given statement is missing a terminator ( ; ) at the end. Thus, it has a syntax error.

Question 10

Question 1(x)Java statement to access the 5th element of an array is:X[4]X[5]X[3]X[0]

Accepted Answer

X[4]Reason — Array indexes start from 0. So, X[4] refers to the 5th element of the array.

Question 11

Question 1(xi)The output of "Remarkable".substring(6) is:markemarkmarkaable

Accepted Answer

ableReason — "Remarkable".substring(6) will extract a substring starting from the character at index 6 (i.e., 7th character of the string) which is 'a' till the end of the string. Hence the output is able.

Question 12

Question 1(xii)Which of the following is the wrapper class for the data type char?StringCharCharacterFloat

Accepted Answer

CharacterReason — Character is the wrapper class for the data type char.

Question 13

Question 1(xiii)Name the package that contains wrapper classes:java.langjava.utiljava.iojava.awt

Accepted Answer

java.langReason — Wrapper classes are present in java.lang package.

Question 14

Question 1(xiv)Constructor	overloading	follows	which principle	of Object Oriented programming?InheritancePolymorphismAbstractionEncapsulation

Accepted Answer

PolymorphismReason — In object-oriented programming, Polymorphism provides the means to perform a single action in multiple different ways and constructor overloading follows Polymorphism principle of Object Oriented programming wherein a constructor having the same name behaves differently with different arguments.

Question 15

Question 1(xv)Which of the following is a valid Integer constant:i.	4ii.	4.0iii. 4.3fiv. "four"Only ii and iiiii and ivi and ii

Accepted Answer

Only iReason — Integer constants represent whole number values only. Thus, 4 is an integer constant. 4.0 is a double constant, 4.3f is a float constant while "four" is a String constant.

Question 16

Question 1(xvi)The method compareTo() returns ............... when two strings are equal and in lowercase :true01false

Accepted Answer

0Reason — compareTo() method compares two strings lexicographically and returns the difference between the ASCII values of the first differing characters in the strings. Here, the strings are equal so the difference is 0.

Question 17

Question 1(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.Both Assertion (A) and Reason (R) are true and Reason (R) is a correct explanation of Assertion (A)Both Assertion (A) and Reason (R) are true and Reason (R) is not a correct explanation of Assertion (A)Assertion (A) is true and Reason (R) is falseAssertion (A) is false and Reason (R) is true

Accepted Answer

Assertion (A) is false and Reason (R) is trueReason — In Java, statements written in lower case letter or upper case letter are treated differently as Java is a case sensitive language.

Question 18

Question 1(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?Information and operationData members and Member methodsData members and informationMember methods and operation

Accepted Answer

Data members and Member methodsReason — A class encapsulates state and behavior by combining data and functions into a single unit. The state of an object is represented by its member variables and behaviour is represented by member methods.

Question 19

Question 1(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.Both Assertion (A) and Reason (R) are true and Reason (R) is a correct explanation of Assertion (A)Both Assertion (A) and Reason (R) are true and Reason (R) is not a correct explanation of Assertion (A)Assertion (A) is true and Reason (R) is falseAssertion (A) is false and Reason (R) is true

Accepted Answer

Both Assertion (A) and Reason (R) are true and Reason (R) is a correct explanation of Assertion (A)Reason — Call by value is known as pure method as it does not modify the value of original variables. The original value of variable does not change as operation is performed on copied values.

Question 20

Question 1(xx)What will be the output for:System.out.print(Character.toLowerCase('1'));
01Atrue

Accepted Answer

1Reason — In Java, the Character.toLowerCase(char ch) method is used to convert a given character to its lowercase equivalent, if one exists. If the character is already in lowercase or there is no lowercase equivalent, it will return the original character.

Solved 2024 Specimen Paper ICSE Class 10 Computer Applications