JAC Board 12th Computer Science Answer Key 2022
JAC Board 12th Computer Science Answer Key 2022:झारखंड ऐकेडमिक काउंसिल जैक(JAC Board) ने कक्षा 12वीं का कंप्यूटर साइंस का परीक्षा कराया है। जैक बोर्ड के विद्यार्थी अपना बहुविकल्पीय प्रश्न का उत्तर यहां से जान सकते हैं
Note: These All Answer Are Verified By The Teacher So Dont Be Confused
Que 1: C++ Is an expression to……….programming language.
1) Pascal
2) Java
3) C
4) B
Ans: C
Que 2: main()is a/an
1) object
2) file
3) function
4) none of these Ans: fuction
Que 3: If a function does not a return a result,then its return type is
1) void
2) int
3) float
4) none of these Ans: void
4.Data items that never change their value during a program run is called
1) Keyword
2) Identifier
3) Literals
4) Operators
Ans: Literals
5.‘\a’ Is Used For
1) From feed
2) Horizontal tab
3) Audible Sound
4) None Of These
Ans: Audible Sound
6.Which of the following is/are valid character literal.
1) ‘ABC’
2) “ABC”
3) ‘C’
4) None of these
Ans: ‘C’
7.In C++, Single line comment begans with
1) /
2) //
3) *
4) $
Ans: //
8.The Prefix increment / decrement operators follow
1) Change then use rule
2) Use then change rule
3) change then throw rule
4) none of these
Ans: Change then use rule
9.A Pointer is a variable that holds
1) Memory address of another variable
2) file address
3) local address
4) non of these
Ans: Memory address of another variable
10. What will be the value of following expression
(5* ++j)%6, if j = 5 initially ?
(1) 1
(2) 0
(3) 30
(4) None of these
Ans:- (2) 0
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11. A set of logical operators is
(1) +, -, *, /, %
(2) >, <, >=, <=, ==, !=
(3) &&, ||, !
(4) ?:
Ans:-(3) &&, ||, !
12. In C++ array index starts from
(1) 0
(2) 2
(3) n
(4) None of these
Ans:- (1) 0
13. What is the output of the following code fragment?
for(int I=1; I<10; I++);
cout<<I;
(1) 10
(2) 1 to 10
(3) 11
(4) None of these
Ans:-(4) None of these
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14. The do-while loop is a/an………controlled loop.
(1) entry
(2) exit
(3) count
(4) None of these
Ans:-(2) exit
15. In C++ programming strcmp() function is used for
(1) count of string
(2) copy string
(3) compare two string
(4) concatenate two string
Ans:-(3) compare two string
16. Which of the following is extraction operator in C++ ?
(1) ^
(2) V
(3) <<
(4) >>
Ans:-(4) >>
17. Which is not a loop structure ?
(1) While
(2) Do-while
(3) For
(4) Repeat until
Ans:-(4) Repeat until
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18. Which of the following is not a feature of c++ ?
(1) Encapsulation
(2) Inheritance
(3) Abstraction
(4) Distributive law
Ans:-(4) Distributive law
19. OOP means
(1) Object Oriented Programming
(2) Object Output Programming
(3) Object Oriented Power
(4) None of these
Ans:-(1) Object Oriented Programming
20. …. is the way of representing essential features without background details.
(1) Inheritance
(2) Encapsulation
(3) Abstraction
(4) None of these
Ans:-(3) Abstraction
21. Class represents
(1) a group of similar objects
(2) a group of different objects
(3) a groups of problems
(4) None of these
Ans:-(1) a group of similar objects
22. Encapsulation is a way to implement
(1) inheritance
(2) modularity
(3) data abstraction
(4) None of these
Ans:-(3) data abstraction
23. Which header file belongs to the function isupper()?
(1) ctype.h
(2) math.h
(3) string.h
(4) conio.h
Ans:-(1) ctype.h
24. Which of the following keyword is used to control access to a class member ?
(1) Default
(2) Break
(3) Private
(4) Access
Ans:-Protected
25. A class supports OOP features
(1) Encapsulation
(2) Abstraction
(3) Data hiding
(4) All of these
Ans:-(4) All of these
26. By default the member of a class are
(1) Private
(2) Public
(3) Protected
(4) None of these
Ans:-(1) Private
27. Which of the following data member of a class can be shared by all the objects of its class ?
(1) Friend
(2) Static
(3) Abstract
(4) None of these
Ans:- None Of These
28. A class defination ends with
(1) , (comma)
(2) . (dot)
(3) : (colon)
(4) ; (semicolon)
Ans:-(4) ; (semicolon)
29. Base class is
(1) Normal class
(2) Derived class
(3) Child class
(4) None of these
Ans:-(1) Normal class
30. If a class A needs to be derived from a class B, which of the following ways is correct to do so ?
(1) Class A: Public B
(2) Class A: Derive Public B
(3) Class B: Public A
(4) None of these
Ans:-(1) Class A: Public B
31. Which of the following cannot be inherited from the base class ?
(1) Constructor
(2) Destructor
(3) Both (1) and (2)
(4) None of these
Ans:-(3) Both (1) and (2)
32. In private inheritance, a protected data member of a base class will be treated in a derived class as
(1) public
(2) private
(3) protected
(4) None of these
Ans:-(2) private
33. A constructor is invoked when
(1) an object is created
(2) an object is noved
(3) an object is copied
(4) None of these
Ans:-(1) an object is created
34. A constructor taking no argument is called
(1) Copy constructor
(2) Default constructor
(3) Parameterized constructor
(4) None of these
Ans:-(2) Default constructor
35. A destructor can have which of the following characteristics ?
(1) It has the same name as of its class name
(2) Its name is preceded by tilde (~) sign
(3) It has no return type
(4) All of these
Ans:- (4) All of these
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