121) Why reference is not same as a pointer?

A. A reference can never be null.

B. A reference once established cannot be changed.

C. Reference doesn’t need an explicit dereferencing mechanism.

D. All of the above.

Answer: Option D

122)cout is a/an __________ .

A. operator

B. function

C. object

D. macro

Answer : C

123) Which of the following concepts provides facility of using object of one class inside another class?

A. Encapsulation

B. Abstraction

C. Composition

D. Inheritance

Answer : C

124) How many types of polymorphisms are supported by C++?

A. 1

B. 2

C. 3

D. 4

Answer : B

125) Which of the following is an abstract data type?

A. int

B. double

C. string

D. Class

Answer : D