Which of the following statement is correct about the references? A reference mu

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Question
Which of the following statement is correct about the references?
Options
A. A reference must always be initialized within functions.
B. A reference must always be initialized outside all functions.
C. A reference must always be initialized.
D. Both A and C.

Correct Answer

A reference must always be initialized.

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2. Which of the following statements is correct?
1. Once the variable and the reference are linked they are tied together.
2. Once the reference of a variable is declared another reference of that variable is not allowed.
Options
A. Only 1 is correct.
B. Only 2 is correct.
C. Both 1 and 2 are correct.
D. Both 1 and 2 are incorrect.

3. Which of the following statements is correct?
1. We can return a global variable by reference.
2. We cannot return a local variable by reference.
Options
A. Only 1 is correct.
B. Only 2 is correct.
C. Both 1 and 2 are correct.
D. Both 1 and 2 are incorrect.

4. Which of the following statements is correct?
Options
A. Base class pointer cannot point to derived class.
B. Derived class pointer cannot point to base class.
C. Pointer to derived class cannot be created.
D. Pointer to base class cannot be created.

5. Why reference is not same as a pointer?
Options
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.

6. Which of the following statement is correct?
Options
A. A referenced has to be de-referenced to access a value.
B. A referenced does not need to be de-referenced to access a value.
C. A referenced has to be double de-referenced to access a value.
D. Whether a reference should be de-referenced or not depends on the type of the reference.

7. Functions can be declared to return a reference type. There are reasons to make such a declaration/Which of the following reasons are correct?
1. The information being returned is a large enough object that returning a reference is more efficient than returning a copy.
2. The type of the function must be a R-value.
Options
A. Only 1 is correct.
B. Only 2 is correct.
C. Both 1 and 2 are correct.
D. Both 1 and 2 are incorrect.

8. Which of the following statement is correct?
Options
A. Once a reference variable has been defined to refer to a particular variable it can refer to any other variable.
B. A reference is indicated by using && operator.
C. Once a reference variable has been defined to refer to a particular variable it cannot refer to any other variable.
D. A reference can be declared beforehand and initialized later.

9. Which of the following statements is correct?
1. An array of references is acceptable.
2. We can also create a reference to a reference.
Options
A. Only 1 is correct.
B. Only 2 is correct.
C. Both 1 and 2 are correct.
D. Both 1 and 2 are incorrect.

10. Which of the following statement is correct?
Options
A. A reference is declared using * operator.
B. Once a reference variable has been defined to refer to a particular variable it can refer to any other variable.
C. A reference must always be initialized within classes.
D. A variable can have multiple references.

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