Q: Question 1(viii)Which operator cannot be used with if-else statement?<=||&&? :

? :Reason — Relational operators ( <= ) and logical operators (|| and &&) can be used to test a condition as they return boolean values. Ternary operator (? :) is used to assign a value to a variable based on a condition. Thus, it cannot be used with if-else statement.

Q: Question 1(ix)By default, floating literal isdoublefloatintlong

doubleReason — By default, floating literal is double.

Q: Question 1(x)JVM converts bytecode directly intomachine codeanother byte codehigh level codeNone of these

machine codeReason — JVM converts bytecode directly into machine code as it is responsible for interpreting or compiling Java bytecode into machine code that is executed by the host computer's CPU.

Question 1

Question 1(i)If ((a > b) && (a > c)), then which of the following statement is true?a is the largest number.b is the largest number.c is the largest number.b is the smallest number.

Accepted Answer

a is the largest number.Reason — Assuming that the given condition ((a > b) && (a > c)) is true, it implies that (a > b) and (a > c) both are true. Hence, a is greater than b and c.

Question 2

Question 1(ii)Which of the following might make the Java compiler report a syntax error in a particular line of a program?The program is typed in the wrong font.The line contains a comma(,) instead of a dot(.).It is caused by Java runtime.Program takes too long to complete.

Accepted Answer

The line contains a comma(,) instead of a dot(.)Reason — In Java, a comma is used to separate items in a list, such as in method arguments or variable declarations. If a dot is expected (e.g., for method calls or accessing object members), and we use a comma instead, it would result in a syntax error.

Question 3

Question 1(iii)A class is :an object factorya blueprint to create objectsa specification for objectsAll of the above

Accepted Answer

All of the aboveReason — A class is considered as an object factory as it is a blueprint to create objects and it contains specifications for objects.

Question 4

Question 1(iv)Assume x = 1 with the following code snippet:int y = --x;Which one of the following is true?x = 1, y = 1x = 0; y = 0x = 1; y = 0x = 0; y = 1

Accepted Answer

x = 0; y = 0Reason — Prefix decrement operator first decrements and then uses the value. Thus, the value of x will be decremented first (making x = 0) and then the value will be assigned to y (making y = 0).

Question 5

Question 1(v)Consider the following code snippet:float x = 8.25F;
int	y;
y = (int)x;What are the values of x and y?x = 8.25, y = 8x = 8.0, y = 8.0x = 8, y = 8.25x = 8, y = 8

Accepted Answer

x = 8.25, y = 8Reason — float data type can store numbers with decimal and int data type stores signed/unsigned integer values. So, x = 8.25. Then, the user is declaring an int variable y and type casting the float value x to an int and assigning it to y.When we cast x to an int, the fractional part is truncated and the int value (8) is stored in y. Thus, y = 8.

Question 6

Question 1(vi)Parameters in method definition are calledactual parametersformal parametersinformal parametersvoid parameters

Accepted Answer

formal parametersReason — Parameters in method definition are called formal parameters.

Question 7

Question 1(vii)Give the output of Math.ceil(-0.6)-1.6-1.5-1.0-0.0

Accepted Answer

-0.0Reason — Math.ceil method returns the smallest double value that is greater than or equal to the argument and is equal to a mathematical integer. Thus, Math.ceil(-0.6) returns -0.0.

Question 8

Question 1(viii)Which operator cannot be used with if-else statement?<=||&&? :

Accepted Answer

? :Reason — Relational operators ( <= ) and logical operators (|| and &&) can be used to test a condition as they return boolean values. Ternary operator (? :) is used to assign a value to a variable based on a condition. Thus, it cannot be used with if-else statement.

Question 9

Question 1(ix)By default, floating literal isdoublefloatintlong

Accepted Answer

doubleReason — By default, floating literal is double.

Question 10

Question 1(x)JVM converts bytecode directly intomachine codeanother byte codehigh level codeNone of these

Accepted Answer

machine codeReason — JVM converts bytecode directly into machine code as it is responsible for interpreting or compiling Java bytecode into machine code that is executed by the host computer's CPU.

Question 11

Question 1(xi)Which of the following statements is true?Binary search is less efficient than linear search.Binary search is more efficient than linear search.Binary search is as efficient as linear search.None of the above

Accepted Answer

Binary search is more efficient than the linear search.Reason — Binary search is more efficient than linear search as it requires lesser number of comparisons to find an element in an array compared to linear search.

Question 12

Question 1(xii)Which element is num[9] of array num?8th9th10th11th

Accepted Answer

10thReason — Array index begins from 0 to size - 1. Thus, num[0] is the 1st element, num[1] is the 2nd element, num[2] is the 3rd element and so on. So, num[9] is actually the 10th element of the array.

Question 13

Question 1(xiii)What is the value returned by function compareTo( ), if the invoking string is less than the string compared?zerovalue less than zerovalue greater than zeroNone of the above

Accepted Answer

value less than zeroReason — The compareTo() method compares two strings lexicographically, and returns a value based on the following logic:if string1 > string2 the result will be a positive integer, i.e., result > 0if string1 < string2 the result will be a negative integer, i.e., result < 0if string1 = string2 the result will be 0, i.e., result = 0

Question 14

Question 1(xiv)............... class is used to convert a primitive data type to its corresponding object.StringWrapperSystemMath

Accepted Answer

WrapperReason — Wrapper class is used to convert a primitive data type to its corresponding object.

Question 15

Question 1(xv)This access specifier can be accessed only by the subclass in other package or any class within the same package.protectedprivatepublicdefault

Accepted Answer

protectedReason — protected access specifier can be accessed only by the subclass in other package or any class within the same package.

Question 16

Question 1(xvi)Which of these data type value is returned by equals() method of string class?charintbooleanAll of these

Accepted Answer

booleanReason — equals() method checks if contents of two strings are same or not. The result is true if the contents are same otherwise it is false.

Question 17

Question 1(xvii)Assertion (A) Class initialisation is the explicit initialisation of class fields to values.Reason (R) Each class field explicitly initialises to a value via a class field initialiser.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 false.Assertion (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 — Assertion (A) is true as constructors are invoked at the time of instance creation which assign values to various class fields. Reason (R) is true as constructors initialize values to class fields. Thus, Reason (R) explains Assertion (A).

Question 18

Question 1(xviii)Read the following text and choose the correct answer:Java constructor overloading is a technique in which a class can have any number of constructors that differ in parameter list. The compiler differentiates these constructors by taking into account the number of parameters in the list and their type.Why	do we use constructor overloading?To use different types of constructors.Because it's a feature provided.To initialise the object in different ways.To differentiate one constructor from another.

Accepted Answer

To initialise the object in different ways.Reason — Constructor overloading is used to initialise the object in different ways. A user can create multiple constructors for a class with different signatures based on the number and type of arguments.

Question 19

Question 1(xix)Assertion (A) JVM is a Java interpreter loaded in the computer memory as soon as Java is loaded.Reason (R) JVM is different for different platforms.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 false.Assertion (A) is false and Reason (R) is true.

Accepted Answer

Both Assertion (A) and Reason (R) are true and Reason (R) is not a correct explanation of Assertion (A).Reason — Assertion (A) is true as JVM interprets the byte code and executes the Java program. Reason (R) is true as JVM is different for different platforms such as Windows, Linux, MacOS etc. Reason (R) is not a correct explanation of Assertion (A).

Question 20

Question 1(xx)String is ............... in Java.interfacemutablemethodimmutable

Accepted Answer

immutableReason — String is immutable in Java.

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