oops mcq.doc

8/9/2019 oops mcq.doc

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1. Which of the following is not a type of constructor?

A. Copy constructor B. Friend constructor

C. Default constructor D. Parameterized constructor

Answer !ption B

". #ow many instances of an a$stract class can $e created?

A.1 B.% C.1& D.'

Answer !ption D

&.(ultiple inheritance means)

*a+ one class inheriting from more super classes

*$+ more classes inheriting from one super class

*c+ more classes inheriting from more super classes

*d+ ,one of the a$o-e

*e+ *a+ and *$+ a$o-e.

Answer *a+

4.n o$/ect oriented programming new classes can $e defined $y e0tending e0isting classes. his is

e0ample of

*a+ *a+2ncapsulation *$+ nterface

*c+ *c+Composition *d+ nheritance *e+ Aggregation.

Answer *d+

%.he wrapping up of data and functions into a single unit is called

*a+ 2ncapsulation *$+ A$straction

*c+ Data #iding *d+ Polymorphism *e+ (essage passing.

Answer *a+


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3.which of the following are legal identifiers in /a-a

*i+ "4 *ii+ temp5 *iii+ Class *i-+ data6 *-+ rue

*a+.*ii+ and *i-+ only

*$+.*ii+)*i-+ and *-+ only

*c+ *ii+)*iii+ and *i-+ only

*d+ *ii+)*iii+)*i-+ and *-+ only

Answer a

7. A class is a mechanism to

*a+. create user defined data types

*$+.encapsulate data and code together

*c+.create and $uild o$/ects

*d+.All of the a$o-e

Answer d

8.n order to e0ecute) a /a-a program is

*a+.only compiled

*$+.only interpreted

*c+.$oth compiled and interpreted

*d+.neither compiled and interpreted

answer c

9. what will $e the output of the following code segment

a:1';

$:9;

system.out.println*a


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1'. in /a-a) the type =char> is

*a+ unsigned 13$it *$+ signed 13$it *c+ unsigned 8$it *d+ signed 8$it

Answer $

11.Assume fi-e o$/ects are created for a class;each o$/ect has its own copy of

*a+ data mem$ers only *$+ mem$er functions only

*c+ data mem$ers and mem$er functions $oth *d+ none of the a$o-e

Answer a

1".n /a-a) >new > operator is used to create

*a+ only primiti-e types *$+ only o$/ects

*c+ $oth primiti-e types and o$/ects *d+ ,one of the a$o-e

Answer c

1&.in /a-a) gar$age collection can $e done done $y

*a+ only manually $y user *$+ automatically $y /a-a runtime

*c+ $oth manually and automatically *d+ ,one of the a$o-e

Answer $

C@@

16. o e0pose a data mem$er to the program) you must declare the data mem$er in the

section of the class

A. common B. e0posed

C. pu$lic D. unrestricted

2. user

Answer C


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1%.

o $e called o$/ectoriented) a programming language must allow

*A+. functions that return only a single -alue

*B+. include files

*C+. inheritance

*D+. All of the a$o-e

Answer !ption C

13. A function that returns no -alues to the program that calls it is

*A+. not allowed in C@@ *B+. type -oid

*C+. type empty *D+. type $arren

Answer !ption B

17.When a child class function is called) the compiler loos first for a matching function name in

the

*A+. class of the o$/ect using the function name

*B+. immediate ancestor class

*C+. $ase class

*D+. descendant class

Answer !ption A

18.

A function that is called automatically each time an o$/ect is destroyed is a

*A+. constructor *B+. destructor

*C+. destroyer *D+. terminator

Answer !ption B

19.

he type to $e used in an instantiation of a class template follows

A. the generic class name B. the eyword template

C. the eyword class D. the template definition

Answer !ption A


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"'.

What does C@@ append to the end of a string literal constant?

A. a space B. a num$er sign *+

C. an asteris *+ D. a null character

Answer !ption D

"1.

!-erloaded functions are reEuired to

A. ha-e the same return type B. ha-e the same num$er of parameters

C. perform the same $asic functions D. ,one of the a$o-e

Answer !ption D

"". A widget is to the $lueprint for a widget as an o$/ect is to

A. a mem$er function B. a class

C. an operator D. a data item

Answer !ption B

"&.

A $ase class may also $e called a

A. child class B. su$class

C. deri-ed class D. parent class

Answer !ption D

"6.The step-by-step instructions that solve a problem are called _____

A. an algorithm

B. a list

C. a plan

D. a sequential structure

Answer: Option A


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"%.

When you pass a -aria$le ) C@@ passes only the contents of the -aria$le to the

recei-ing function

A. $y reference B. $y -alue

C. glo$ally D. locally

Answer !ption B

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