CS401 Grand Quiz Solution

CS401 GRAND QUIZ SOLUTION BY MCS of Virtuallians

1. The base pointer accesses local variables using _______ offsets. Negative

Q2. Which of the following describes the purpose of MOVS instruction?

Move memory to memory

Q3. Which part of this (0000000B80500) encoded instruction is an offset?

0500

4. Stack is a data structure that behaves a first in last _______ manner. Out
5. In the instruction “mov word [es:160], 0x1230”, 30 represents ______ character.
6. Multiplying two 4 bit numbers result in a ________ bit number.
7. In case of near jump, the relative address is stored in _______ bits.
8. _______ instructions have two parameters, one is the general purpose register to be loaded and the other is the memory location from which to load these registers. LDS
9. Physical memory address is of 20 bits
10. ________ ports which interface the processor to the external world, including keyboards, mice, monitors, disc drives. Input, output
11. In base+offset addressing, the value contained in the base register is add with offset to get ______.
12. In 8051, there is an _________ stack. Incrementing
13. AX register can be divided into ______ and _____ bytes Lower, higher
14. CLI stands for Clear the interrupt flag
15. When a 32 bit number is divided by a 16 bit number, the remainder is of 16 bits
16. MUL instruction performs an unsigned multiplication of _______ with the source operand.
17. DW can store ______ bit value in it.

Q18. When the stack pointer, points to the return address?

When the bubble sort subroutine is called

19. IAPX88 stands for ________. Intel Advanced Processor Extensions 88
20. 90 is the op-code of Do nothing
21. When characters are stored in any high level or low level language, the actual thing stored in a byte is their ______. ASCII code
22. We can convert any digit to ______ by adding 0x30 in the digit. ASCII
23. A complete _______ is called a pass over the array Iteration

Q24. Which of the following is a non-destructive AND operation?

Test

25. In _______ operation the carry flag is inserted from the right causing every bit to move one location to its left and the most significant bit occupying the carry flag. Rotate Through Carry Left (RCL)
26. ASCII table is the contiguous arrangement of the uppercase alphabets (41-5A), the lowercase alphabets (61-7A), and the numbers _________. 30-39
27. _______ can also be used as a masking operation to invert selective bits. XOR
28. BH register is a _______ bit register.

Q29. Which of the following is the renamed version of conditional jump JZ?

JE

30. SP is associated (by default) with _______. SS
31. The maximum amount of memory accessible using 8085 processor is ________. 64 KB
32. In XOR operation the output is 1 if Both inputs are different
33. The clear screen operation initializes whole block of video memory to: 0720
34. The 8088 processor divides interrupts into ______ classes. Two

Q35. Which of the following directive is used to reserve a 8 bit space in the memory for holding data?

db

36. All mathematical and logical operations are performed on the _______
37. ______ jump is not position relative but is absolute Far