Electronics and Communication Engineering - Microprocessors

6. 

Assertion (A): Dynamic RAM needs refreshing.

Reason (R): Capacitors tend to loose charge.

A. Both A and R are correct and R is correct explanation of A
B. Both A and R are correct but R is not correct explanation of A
C. A is correct R is wrong
D. A is wrong R is correct

Answer: Option A

Explanation:

Dynamic RAM consists of a capacitor which has to be recharged.


7. 

When one operand is real and one integer in Pascal, which of the following operations are not allowed?

A. + and -
B. *
C. /
D. Div and Mod

Answer: Option D

Explanation:

In Pascal div and mod are not allowed with one real and the other integer operator.


8. 

Consider the following statements about an array in Pascal

  1. An array has a fixed predetermined number of components.
  2. Any component of an array can be accessed using an index.
  3. An array variable name refers to a group of quantities by a single name.
  4. When array variables are used an appropriate declaration is required.
Which of the above are correct?

A. All
B. 1, 2, 3 only
C. 2, 3, 4 only
D. 1, 2 and 4 only

Answer: Option A

Explanation:

All are true.


9. 

Which of the following is a valid integer constant?

A. 17.0
B. -18.58
C. 101.14
D. -810

Answer: Option D

Explanation:

- 810 is the only one without decimal point.


10. 

When two ALU 1C 74181 are cascaded

A. the carry out of first stage is connected to carry in of second stage
B. the carry in of first stage connected to carry in of second stage
C. the carry in of first stage is connected to carry out of second stage
D. the carry out of first stage is connected to carry out of second stage

Answer: Option A

Explanation:

In cascading carry out of first stage is connected to carry in of second stage.