This set of tricky Digital Electronic/Circuits questions and answers focuses on “Read Only Memory(ROM) – 2”.
1. The MOS technology based semiconductor ROMs are classified into _____ categories.
a) 2
b) 3
c) 4
d) 5
View Answer
Explanation: The MOS technology based semiconductor ROMs are classified into three categories: Mask ROM, PROM,& EPROM. PROM stands for Programmable Read Only Memory in which the ROM can be externally programmed by the user. EPROM stands for Erasable Programmable Read Only Memory, where the ROM and be cleared and re-programmed.
2. MOS ROM is constructed using __________
a) FETs
b) Transistors
c) MOSFETs
d) BJTs
View Answer
Explanation: MOS ROM is made up of MOSFETs. MOSFETs are Metal Oxide Semiconductor Field Effect Transistors.
3. The full form of EEPROM is __________
a) Erasable Electrically Programmable ROMs
b) Electrically Erasable Programmable ROMs
c) Electrically Erasable Programming ROMs
d) Electrically Erasable Programmed ROMs
View Answer
Explanation: The full form of EEPROM is Electrically Erasable Programmable ROMs. In EPROM (Erasable Programmable ROMs), the ROM is cleared by exposing it to UV radiation and also it’s a tedious process. Whereas, in EEPROM, the ROM can be cleared electrically and thus is less time consuming and more efficient.
4. Which of the following best describes EPROMs?
a) EPROMs can be programmed only once
b) EPROMs can be erased by UV
c) EPROMs can be erased by shorting all inputs to the ground
d) EPROMs can be erased electrically
View Answer
Explanation: EPROM (Erasable Programmable ROMs), the ROM is cleared by exposing it to UV radiation and also it’s a tedious process. Whereas, in EEPROM, the ROM can be cleared electrically and thus is less time consuming and more efficient.
5. The Width of a processor’s data path is measured in bits. Which of the following are common data paths?
a) 8 bits
b) 12 bits
c) 16 bits
d) 32 bits
View Answer
Explanation: In generalised form, the data paths are of 8 bits. The data path, also known as data bus, is the channel through which the processor sends and receives data.
6. What type of memory is not directly addressable by the CPU and requires special software called EMS (expanded memory specification)?
a) Extended
b) Expanded
c) Base
d) Conventional
View Answer
Explanation: Expanded memory is not directly addressable by the CPU. Expanded memory is the additional memory which is incorporated beyond the parent memory limit of the processor.
7. Which bus is used for input and output in case of microprocessor operation?
a) Address bus
b) System bus
c) Control bus
d) Data bus
View Answer
Explanation: The input and output are used to control the function of a microprocessor. Hence, the control bus is used to transfer the input and output signal from microprocessor to external peripherals and or from external peripherals to microprocessor.
8. What is the major difference between DRAM and SRAM?
a) Dynamic RAMs are always active; static RAMs must reset between data read/write cycles
b) SRAMs can hold data via a static charge, even with power off
c) The only difference is the terminal from which the data is removed—from the FET Drain or Source
d) DRAMs must be periodically refreshed
View Answer
Explanation: DRAMs must be periodically refreshed so that it can store the new information. DRAMs are slower compared to SRAMs as the access time for SRAM is less than that of DRAM.
9. Which of the following is not a part of Hard disk?
a) Platter
b) Read/Write
c) Valve
d) Spindle
View Answer
Explanation: A valve is a device that regulates, directs or controls the flow of a fluid (gases, liquids, fluidized solids, or slurries) by opening, closing, or partially obstructing various passageways. So, it is not a part of hard disk.
10. Which ROM can be erased by an electrical signal?
a) ROM
b) Mask ROM
c) EPROM
d) EEPROM
View Answer
Explanation: In EPROM (Erasable Programmable ROMs), the ROM is cleared by exposing it to UV radiation and also it’s a tedious process. Whereas, in EEPROM, the ROM can be cleared electrically and thus is less time consuming and more efficient.
11. In the floppy drive, data is written to and read from the disk via a magnetic _____ head mechanism.
a) Cluster
b) Read/Write
c) Cylinder
d) Recordable
View Answer
Explanation: A floppy disk is a removable disk used for storing data via magnetic facilities. In the floppy drive, data is written to and read from the disk via a magnetic read/write head mechanism.
12. What does the term “random access” mean in terms of memory?
a) Any address can be accessed in systematic order
b) Any address can be accessed in any order
c) Addresses must be accessed in a specific order
d) Any address can be accessed in reverse order
View Answer
Explanation: “Random access” mean which can be accessed randomly and in other words any address can be accessed in any order.
13. Which type of ROM has to be custom built by the factory?
a) EEPROM
b) Mask ROM
c) EPROM
d) PROM
View Answer
Explanation: All types of ROM are programmable and can be programmed as per requirement but the mask ROM is always programmed for specific application and it can’t be reprogrammed. PROM stands for Programmable Read Only Memory in which the ROM can be externally programmed by the user. EPROM stands for Erasable Programmable Read Only Memory, where the ROM and be cleared and re-programmed.
14. The computer’s main memory is __________
a) Hard drive and RAM
b) CD-ROM and hard drive
c) RAM and ROM
d) CMOS and hard drive
View Answer
Explanation: The computer’s main memory is RAM and ROM because all the storage related operation are performed by the data present in RAM/ROM. RAM stands for Random Access Memory where any address can accessed in any order. ROM stands for Read Only Memory wherefrom data can only be read.
15. A major disadvantage of the mask ROM is that ____________
a) It is time consuming to change the stored data when system requirements change
b) It is very expensive to change the stored data when system requirements change
c) It cannot be reprogrammed if stored data needs to be changed
d) It has an extremely short life expectancy and requires frequent replacement
View Answer
Explanation: A major disadvantage of the mask ROM is that it cannot be reprogrammed if stored data needs to be changed. PROM stands for Programmable Read Only Memory in which the ROM can be externally programmed by the user. EPROM stands for Erasable Programmable Read Only Memory, where the ROM and be cleared and re-programmed.
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