McqMate
These multiple-choice questions (MCQs) are designed to enhance your knowledge and understanding in the following areas: Bachelor of Computer Applications (BCA) .
1. |
In Reverse Polish notation, expression A*B+C*D is written as |
A. | AB*CD*+ |
B. | A*BCD*+ |
C. | AB*CD+* |
D. | A*B*CD+ |
Answer» A. AB*CD*+ |
2. |
SIMD represents an organization that ______________. |
A. | refers to a computer system capable of processing several programs at the same time. |
B. | represents organization of single computer containing a control unit, processor unit and a memory unit. |
C. | includes many processing units under the supervision of a common control unit |
D. | none of the above. |
Answer» C. includes many processing units under the supervision of a common control unit |
3. |
Floating point representation is used to store |
A. | Boolean values |
B. | whole numbers |
C. | real integers |
D. | integers |
Answer» C. real integers |
4. |
Suppose that a bus has 16 data lines and requires 4 cycles of 250 nsecs each to transfer data. The bandwidth of this bus would be 2 Megabytes/sec. If the cycle time of the bus was reduced to 125 nsecs and the number of cycles required for transfer stayed the same what would the bandwidth of the bus? |
A. | 1 Megabyte/sec |
B. | 4 Megabytes/sec |
C. | 8 Megabytes/sec |
D. | 2 Megabytes/sec |
Answer» D. 2 Megabytes/sec |
5. |
Assembly language |
A. | uses alphabetic codes in place of binary numbers used in machine language |
B. | is the easiest language to write programs |
C. | need not be translated into machine language |
D. | None of these |
Answer» A. uses alphabetic codes in place of binary numbers used in machine language |
6. |
In computers, subtraction is generally carried out by |
A. | 9’s complement |
B. | 10’s complement |
C. | 1’s complement |
D. | 2’s complement |
Answer» D. 2’s complement |
7. |
The amount of time required to read a block of data from a disk into memory is composed of seek time, rotational latency, and transfer time. Rotational latency refers to |
A. | the time its takes for the platter to make a full rotation |
B. | the time it takes for the read-write head to move into position over the appropriate track |
C. | the time it takes for the platter to rotate the correct sector under the head |
D. | none of the above |
Answer» A. the time its takes for the platter to make a full rotation |
8. |
What characteristic of RAM memory makes it not suitable for permanent storage? |
A. | too slow |
B. | unreliable |
C. | it is volatile |
D. | too bulky |
Answer» C. it is volatile |
9. |
Computers use addressing mode techniques for _____________________. |
A. | giving programming versatility to the user by providing facilities as pointers to memory counters for loop control |
B. | to reduce no. of bits in the field of instruction |
C. | specifying rules for modifying or interpreting address field of the instruction |
D. | All the above |
Answer» D. All the above |
10. |
The circuit used to store one bit of data is known as |
A. | Register |
B. | Encoder |
C. | Decoder |
D. | Flip Flop |
Answer» D. Flip Flop |
11. |
(2FAOC) 16 is equivalent to |
A. | (195 084) 10 |
B. | (001011111010 0000 1100) 2 |
C. | Both (A) and (B) |
D. | None of these |
Answer» B. (001011111010 0000 1100) 2 |
12. |
The average time required to reach a storage location in memory and obtain its contents is called the |
A. | seek time |
B. | turnaround time |
C. | access time |
D. | transfer time |
Answer» C. access time |
13. |
Which of the following is not a weighted code? |
A. | Decimal Number system |
B. | Excess 3-cod |
C. | Binary number System |
D. | None of these |
Answer» B. Excess 3-cod |
14. |
The idea of cache memory is based |
A. | on the property of locality of reference |
B. | on the heuristic 90-10 rule |
C. | on the fact that references generally tend to cluster |
D. | all of the above |
Answer» A. on the property of locality of reference |
15. |
Which of the following is lowest in memory hierarchy? |
A. | Cache memory |
B. | Secondary memory |
C. | Registers |
D. | RAM |
Answer» B. Secondary memory |
16. |
The addressing mode used in an instruction of the form ADD X Y, is |
A. | Absolute |
B. | indirect |
C. | index |
D. | none of these |
Answer» C. index |
17. |
If memory access takes 20 ns with cache and 110 ns with out it, then the ratio ( cache uses a 10 ns memory) is |
A. | 93% |
B. | 90% |
C. | 88% |
D. | 87% |
Answer» B. 90% |
18. |
In a memory-mapped I/O system, which of the following will not be there? |
A. | LDA |
B. | IN |
C. | ADD |
D. | OUT |
Answer» A. LDA |
19. |
In a vectored interrupt. |
A. | the branch address is assigned to a fixed location in memory. |
B. | the interrupting source supplies the branch information to the processor through an interrupt vector. |
C. | the branch address is obtained from a register in the processor |
D. | none of the above |
Answer» B. the interrupting source supplies the branch information to the processor through an interrupt vector. |
20. |
Von Neumann architecture is |
A. | SISD |
B. | SIMD |
C. | MIMD |
D. | MISD |
Answer» A. SISD |
21. |
The circuit used to store one bit of data is known as |
A. | Encoder |
B. | OR gate |
C. | Flip Flop |
D. | Decoder |
Answer» C. Flip Flop |
22. |
Cache memory acts between |
A. | CPU and RAM |
B. | RAM and ROM |
C. | CPU and Hard Disk |
D. | None of these |
Answer» A. CPU and RAM |
23. |
Write Through technique is used in which memory for updating the data |
A. | Virtual memory |
B. | Main memory |
C. | Auxiliary memory |
D. | Cache memory |
Answer» D. Cache memory |
24. |
Generally Dynamic RAM is used as main memory in a computer system as it |
A. | Consumes less power |
B. | has higher speed |
C. | has lower cell density |
D. | needs refreshing circuitary |
Answer» B. has higher speed |
25. |
In signed-magnitude binary division, if the dividend is (11100) 2 and divisor is (10011) 2 then the result is |
A. | (00100) 2 |
B. | (10100) 2 |
C. | (11001) 2 |
D. | (01100) 2 |
Answer» B. (10100) 2 |
26. |
Virtual memory consists of |
A. | Static RAM |
B. | Dynamic RAM |
C. | Magnetic memory |
D. | None of these |
Answer» A. Static RAM |
27. |
In a program using subroutine call instruction, it is necessary |
A. | initialise program counter |
B. | Clear the accumulator |
C. | Reset the microprocessor |
D. | Clear the instruction register |
Answer» D. Clear the instruction register |
28. |
A Stack-organised Computer uses instruction of |
A. | Indirect addressing |
B. | Two-addressing |
C. | Zero addressing |
D. | Index addressing |
Answer» C. Zero addressing |
29. |
If the main memory is of 8K bytes and the cache memory is of 2K words. It uses associative mapping. Then each word of cache memory shall be |
A. | 11 bits |
B. | 21 bits |
C. | 16 bits |
D. | 20 bits |
Answer» C. 16 bits |
30. |
A-Flip Flop can be converted into T-Flip Flop by using additional logic circuit |
A. | n TQD =• |
B. | T D = |
C. | D = T . Q n |
D. | n TQD =⊕ |
Answer» D. n TQD =⊕ |
31. |
Logic X-OR operation of (4ACO) H & (B53F) H results |
A. | AACB |
B. | 0000 |
C. | FFFF |
D. | ABCD |
Answer» C. FFFF |
32. |
When CPU is executing a Program that is part of the Operating System, it is said to be in |
A. | Interrupt mode |
B. | System mode |
C. | Half mode |
D. | Simplex mode |
Answer» B. System mode |
33. |
An n-bit microprocessor has |
A. | n-bit program counter |
B. | n-bit address register |
C. | n-bit ALU |
D. | n-bit instruction register |
Answer» D. n-bit instruction register |
34. |
Cache memory works on the principle of |
A. | Locality of data |
B. | Locality of memory |
C. | Locality of reference |
D. | Locality of reference & memory |
Answer» C. Locality of reference |
35. |
The main memory in a Personal Computer (PC) is made of |
A. | cache memory. |
B. | static RAM |
C. | Dynamic Ram |
D. | both (A) and (B) . |
Answer» D. both (A) and (B) . |
36. |
In computers, subtraction is carried out generally by |
A. | 1's complement method |
B. | 2's complement method |
C. | signed magnitude method |
D. | BCD subtraction method |
Answer» B. 2's complement method |
37. |
PSW is saved in stack when there is a |
A. | interrupt recognised |
B. | execution of RST instruction |
C. | Execution of CALL instruction |
D. | All of these |
Answer» A. interrupt recognised |
38. |
The multiplicand register & multiplier register of a hardware circuit implementing booth's algorithm have (11101) & (1100). The result shall be |
A. | (812) 10 |
B. | (-12) 10 |
C. | (12) 10 |
D. | (-812) 10 |
Answer» A. (812) 10 |
39. |
The circuit converting binary data in to decimal is |
A. | Encoder |
B. | Multiplexer |
C. | Decoder |
D. | Code converter |
Answer» D. Code converter |
40. |
A three input NOR gate gives logic high output only when |
A. | one input is high |
B. | one input is low |
C. | two input are low |
D. | all input are high |
Answer» D. all input are high |
41. |
n bits in operation code imply that there are ___________ possible distinct operators |
A. | 2n |
B. | 2n |
C. | n/2 |
D. | n2 |
Answer» B. 2n |
42. |
_________ register keeps tracks of the instructions stored in program stored in memory. |
A. | AR (Address Register) |
B. | XR (Index Register) |
C. | PC (Program Counter) |
D. | AC (Accumulator) |
Answer» C. PC (Program Counter) |
43. |
Memory unit accessed by content is called |
A. | Read only memory |
B. | Programmable Memory |
C. | Virtual Memory |
D. | Associative Memory |
Answer» D. Associative Memory |
44. |
‘Aging registers’ are |
A. | Counters which indicate how long ago their associated pages have been referenced. |
B. | Registers which keep track of when the program was last accessed. |
C. | Counters to keep track of last accessed instruction. |
D. | Counters to keep track of the latest data structures referred. |
Answer» A. Counters which indicate how long ago their associated pages have been referenced. |
45. |
The instruction ‘ORG O’ is a |
A. | Machine Instruction. |
B. | Pseudo instruction. |
C. | High level instruction. |
D. | Memory instruction. |
Answer» B. Pseudo instruction. |
46. |
Translation from symbolic program into Binary is done in |
A. | Two passes. |
B. | Directly |
C. | Three passes. |
D. | Four passes. |
Answer» A. Two passes. |
47. |
A floating point number that has a O in the MSB of mantissa is said to have |
A. | Overflow |
B. | Underflow |
C. | Important number |
D. | Undefined |
Answer» B. Underflow |
48. |
The BSA instruction is |
A. | Branch and store accumulator |
B. | Branch and save return address |
C. | Branch and shift address |
D. | Branch and show accumulator |
Answer» B. Branch and save return address |
49. |
Logic gates with a set of input and outputs is arrangement of |
A. | Combinational circuit |
B. | Logic circuit |
C. | Design circuits |
D. | Register |
Answer» A. Combinational circuit |
50. |
MIMD stands for |
A. | Multiple instruction multiple data |
B. | Multiple instruction memory data |
C. | Memory instruction multiple data |
D. | Multiple information memory data |
Answer» A. Multiple instruction multiple data |
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