General Computer Test - 136

 

1. A four bit number is given as 1001. Its 1's complement is

a. 1001

 b. 11001

c. 0110

 d. 0101

2. 2's complement representation of a decimal number -4 is

a. 0100

b. 1100

c. 1011

d. 1010

3. BCD numbers are obtained

a. by converting decimal number to binary

b. by converting decimal to octal

c. when each decimal digit is represented by four bit binary

d. by converting binary to decimal.

4. A gate in which all inputs must be low to get a high output is called

a. an inverter

 b. a NOR gate

c. an AND gate

 d. a NAND gate

5. For a logical circuit there are 'n' binary inputs. Then the number of different input combinations in the truth table is

a. 2n

 b. 2/n

c. 2n

 d. 2(n+1)

6. Which of the following performs modulation and demodulation

a. Satellite

 b. modem

c. fiber optic

 d. amplifier

7. A characteristic of multiprogramming system is

 a. simultaneous execution of program instructions from two applications

b. concurrent processing of two or more programs

c. multiple CPU's

d. all of the above

8. Communication circuits that transmit data in both directions but not at the same time are operating in

a. simplex mode

 b. half-duplex mode

c. full-duplex mode

 d. asynchronous mode

9. Operating system functions may include

a. input/output contro

l b. virtual storage

c. multiprogramming

d. all of the above

10. Transmission of computerised data from one location to another is called

a. data transfer

 b. data flow

c. data communication

 d. datamanagement

11. Which of the following items is not used in LAN

a. computers

 b. modem

c. printer

 d. cable

12. Which is the device that converts compuer output into a form that can be transmitted over a telephone line

a. teleport

 b. multiplexer

c. concentrator

 d. modem

13. What is the commonly used unit for measuring the speed of data transmission

a. bytes per second

 b. bits per second

c. baud

 d. either b or d

14. A kilobyte also referred to as KB, is equal to

a. 1000 bytes

 b. 1024 bytes

c. 2048 bytes

 d. 512 bytes

15. Inputs to your computer is accomplished using the

a. Screen

 b. keyboard

c. printer

 d. plotter

16. Which of the following is not used as secondary storage

a. Semiconductor memory

b. magnetic disks

c. magnetic drums

d. magnetic tapes

17. A collection of wires that connects several device is called

a. link

 b. bus

c. cable

d. port

18.  A offline device is

a. a device which is not connected to CPU

b. a device which is connected to CPU

c. a device which is in breakdown stage

d. None of these

19. Which of the following is the fastest

a. CPU

b. magnetic tapes and disks

c. video terminal

d. sensors, mechanical controllers

20. Memories in which any location can be reached in a fixed and short amount of time after specifying its address is called

a. sequential access memory

b. random access memory

c. secondary memory

d. mass storage

21. The register which contains the data to be written into or read out of the addressed location is known as

a. index register

b. memory address register

c. memory data register

d. program counter

22. The register which keeps track of the execution of a program and which contains the memory address of the next instruction to be executed is known as

a. index register

 b. instruction register

c. memory address register

d. program counter

23. Which of the following is used as storage locations both in the ALU and in the control section of a computer

a. accumulator

 b. register

c. adder

 d. decoder

24. Accumulator is a

a. hardwired unit

b. sequential circuit

c. finite state machine

d. register

25. Non volatility is an important advantage of

a. CCDs

b. magnetic tapes and disks

c. magnetic bubbles

 d. both b and c

1. c 2. b 3. c 4. b 5. c 6. b 7. b 8. b

9. d 10. c 11. b 12. d 13. d 14. b 15. b 16. a 17. b 18. a 19. a

20. b 21. c 22. d 23. b 24. d 25. d