21.

If truth values of P be F and q be T. Then, truth value of $~ \left(~ \mathrm{p} \vee \mathrm{q}\right)$ is

• T

• F

• Either T or F

• Neither T or F

Let A be any element in a Boolean algebra B, if a + x = 1 and ax = 0, then

• x = 1

• x = 0

• x = a

• x = a'

Dual of (x + y) . (x + 1) = x + x . y + y is

• (x . y) + (x . 0) = x . (x + y) . y

• (x + y) + (x . 1) = x . (x + y) . y

• (x . y) (x . 0) = x . (x + y) . y

• None of these

Let p and q be two statements. Then, p v q is false, if

• pis false and q is true

• both p and q are false

• both p and q are true

• None of the above

If $\mathrm{p} \Rightarrow \left(~ \mathrm{p} \vee \mathrm{q}\right)$ is false, the truth value of p and q are respectively

• F, T

• F, F

• T, F

• T, T

Let p, q, r and s be statements and suppose that $\mathrm{p} \to \mathrm{q} \to \mathrm{r} \to \mathrm{p}$. If $~ \mathrm{s} \to \mathrm{r}$, then

• $\mathrm{s} \to ~ \mathrm{q}$

• $~ \mathrm{q} \to \mathrm{s}$

• $~ \mathrm{s} \to ~ \mathrm{q}$

• $\mathrm{q} \to ~ \mathrm{s}$

Which of the following is a universal gate?

• NAND

• OR

• AND

• NOT

Wat is compiler?

• Applcaton software

• System software

• Utility software

• All of these

RAM is a

• volatile memory

• non-volatile memory

• cash memory

• dynamic memory

Who said, "Number of transistors per square inch on integrated circuits double every year, since their invention will continue to do so in the foreseable future"?

• Alan Turing

• Jon Von Neumann

• Herbert Simon

• Gorden Moore