Question 1

Question 1(i)Return data type of isLetter(char) is ............... .Booleanbooleanboolchar

Accepted Answer

booleanReason — isLetter() method returns true if the specified character is a letter else, it returns false. Thus, the return data type of isLetter(char) is boolean.

Question 2

Question 1(ii)Method that converts a character to uppercase is ............... .toUpper()ToUpperCase()toUppercase()toUpperCase(char)

Accepted Answer

toUpperCase(char)Reason — Method that converts a character to uppercase is toUpperCase(char) method.

Question 3

Question 1(iii)Give output of the following String methods:"SUCESS".indexOf('S') + "SUCCESS".lastIndexOf('S')056-5

Accepted Answer

6Reason — indexOf() returns the index of the first occurrence of the specified character within the string and lastIndexOf() returns the index of the last occurrence of the specified character within the string. Since a string begins with index 0, the given methods are evaluated as follows:"SUCESS".indexOf('S') + "SUCCESS".lastIndexOf('S')⇒ 0 + 6⇒ 6

Question 4

Question 1(iv)Corresponding wrapper class of float data type is ............... .FLOATfloatFloatFloating

Accepted Answer

FloatReason — Corresponding wrapper class of float data type is Float.

Question 5

Question 1(v)............... 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 6

Question 1(vi)Give the output of the following code:System.out.println("Good".concat("Day"));GoodDayGood DayGooddaygoodDay

Accepted Answer

GoodDayReason — concat() method is used to join two strings. Thus, "Good" and "Day" are joined together and printed as "GoodDay".

Question 7

Question 1(vii)A single dimensional array contains N elements. What will be the last subscript?NN - 1N - 2N + 1

Accepted Answer

N - 1Reason — The index of an array begins from 0 and continues till Size - 1. Thus, if an array has N elements, the last subscript/index will be N - 1.

Question 8

Question 1(viii)The access modifier that gives least accessibility is:privatepublicprotectedpackage

Accepted Answer

privateReason — A data member or member method declared as private is only accessible inside the class in which it is declared. Thus, it gives the least accessibility.

Question 9

Question 1(ix)Give the output of the following code :String A = "56.0", B = "94.0";
double C = Double.parseDouble(A); 
double D = Double.parseDouble(B); 
System.out.println((C+D));100150.0100.0150

Accepted Answer

150.0Reason — parseDouble() method returns a double value represented by the specified string. Thus, double values 56.0 and 94.0 are stored in C and D, respectively. Both C and D are added and 150.0 (56.0 + 94.0) is printed on the screen.

Question 10

Question 1(x)What will be the output of the following code?System.out.println("Lucknow".substring(0,4));LucknowLucknLuckluck

Accepted Answer

LuckReason — The substring() method returns a substring beginning from the startindex and extending to the character at index endIndex - 1. Since a string index begins at 0, the character at startindex (0) is 'L' and the character at the endIndex (4-1 = 3) is 'k'. Thus, "Luck" is extracted and printed on the screen.

Solved 2022 Semester 2 Question Paper ICSE Class 10 Computer Applications