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Hassan
1.Which of the following are input devices?
A. Keyboard
B. Mouse
C. Card reader
D. Keyboard
2. Programmable peripheral input-output port is other name for
A. serial input-output port
B. parallel input-output port
C. serial input port
D. serial input-output port
3.Port C of 8255 can function independently as
A. input port
B. output port
C. either input or output ports
D. input port
4.All the functions of the ports of 8255 are achieved by programming the bits of an internal register called
A. data bus control
B. read logic control
C. control word register
D. data bus control
5.The data bus buffer is controlled by
A. control word register
B. read/write control logic
C. data bus
D. control word register
6.The input provided by the microprocessor to the read/write control logic is
A. RESET
B. A1
C. WR(ACTIVE LOW)
D. RESET
7.The device that receives or transmits data upon the execution of input or output instructions by the microprocessor is
A. control word register
B. read/write control logic
C. 3-state bidirectional buffe
D. control word register
8.The port that is used for the generation of handshake lines in mode 1 or mode 2 is
A. port A
B. port B
C. port C Lower
D. port A
9.If A1=0, A0=1 then the input read cycle is performed from
A. port A to data bus
B. port B to data bus
C. port C to data bus
D. port A to data bus
10.The function, „data bus tristated‟ is performed when
A. CS(active low) =1
B. CS(active low) =0
C. CS(active low) =0, RD(active low) =1, WR(active low) =1CS(active low) =1 OR CS(active low) =0, RD(active low) =1, WR(active low) =1
D. CS(active low) =1
11.The pin that clears the control word register of 8255 when enabled is
A. CLEAR
B. SET
C. RESET
D. CLEAR
12.The device that enables the microprocessor to read data from the external devices is
A. printer
B. joystick
C. display
D. printer
13.Which of the following is not valid statement
A. Hard is referred to mean something temporary
B. Hard is used to mean something tangible
C. Soft is used to mean something permanent
D. Hard is referred to mean something temporary
14.Digital devices are
A. Digital Clock
B. Automobile speed meter
C. Clock with a dial and two hands
D. Digital Clock
15.Primary memory stores
A. Data alone
B. Programs alone
C. Results alone
D. Data alone
16.After copying the content how many times can you paste?
A. 1
B. 16
C. 32
D. 1
17.WAN stands for
A. Wap Area Network
B. Wide Area Network
C. Wide Array Net
D. Wap Area Network
18.An error in computer data is called
A. Chip
B. Bug
C. CPU
D. Chip
19.The instructions for starting the computer are house on
A. Random access memory
B. CD-Rom
C. Read only memory chip
D. Random access memory
20.1 nibble equals to
A. 1 bits
B. 2 bits
C. 4 bits
D. 1 bits
21.Perforated paper used as input of output media is known as
A. paper tapes
B. magnetic tape
C. punched papers tape
D. paper tapes
22.The secondary storage devices can only store data but they cannot perform
A. Arithmetic Operation
B. Logic operation
C. Fetch operations
D. Arithmetic Operation
23.Which type of memory can read data but can’t write data?
A. Random only memory
B. Random-access memory
C. Read-only memory
D. Random only memory
24.Which type of memory can speed up computer processing?
A. ROM
B. Cache memory
C. Registers
D. ROM
25.Which one is volatile?
A. DROM
B. Secondary memory
C. RAM
D. DROM
26..Which memory is onboard storage?
A. Random-access memory
B. Cache memory
C. Virtual memory
D. Random-access memory
27. From where the processor can access data fastly?
A. Random-access memory
B. Cache memory
C. Registers
D. Random-access memory
28.Which type of ROM contains no Initial storage at the time of manufacturing?
A. PROM
B. EROM
C. DROM
D. PROM
29. Which one is not known as type of computer memory?
A. DRAM
B. SRAM
C. FRAM
D. DRAM
30..How many bits contains by Cells of computer memory?
A. 16 Bits
B. 32 bits
C. 4 Bits
D. 16 Bits
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