250+ TOP MCQs on Random Access Memory – 1 and Answers

Digital Electronics/Circuits Multiple Choice Questions on “Random Access Memory – 1”.

1. What is the access time?
A. The time taken to move a stored word from one bit to other bits after applying the address bits
B. The time taken to write a word after applying the address bits
C. The time taken to read a stored word after applying the address bits
D. The time taken to erase a stored word after applying the address bits
Answer: C
Clarification: The access time is the time taken to read a stored word after applying the address bits in a MOS EPROM. It is the time required to fetch data from the memory.

2. What are the typical values of tOE?
A. 10 to 20 ns for bipolar
B. 25 to 100 ns for NMOS
C. 12 to 50 ns for CMOS
D. All of the Mentioned
Answer: D
Clarification: The access time is the time taken to read a stored word after applying the address bits in a MOS EPROM. It is the time required to fetch data from the memory. The typical values of tOE (i.e. access time) are 10 to 20 ns for bipolar, 25 to 100 ns for NMOS and 12 to 50 ns for CMOS.

3. Which of the following is not a type of memory?
A. RAM
B. FPROM
C. EEPROM
D. ROM
Answer: C
Clarification: EEPROM (Electrical Erasable Programmable ROM) is not a type of memory because it is used for erasing purpose only. Through EEPROM, data can be erased electrically, thereby consuming less time.

4. The chip by which both the operation of read and write is performed __________
A. RAM
B. ROM
C. PROM
D. EPROM
Answer: A
Clarification: A Random Access Memory (RAM) is a volatile chip memory in which both the read and write operations can be performed. Since it is volatile, therefore it stores data as long as power is on.

5. RAM is also known as __________
A. RWM
B. MBR
C. MAR
D. ROM
Answer: A
Clarification: A Random Access Memory (RAM) is a volatile chip memory in which both the read and write operations can be performed. Since it is volatile, therefore it stores data as long as power is on. RAM is also known as RWM (i.e. Read Write Memory).

6. If a RAM chip has n address input lines then it can access memory locations upto __________
A. 2^(n-1)
B. 2⁽ⁿ⁺¹⁾
C. 2ⁿ
D. 2²ⁿ
Answer: C
Clarification: RAM is a volatile memory, therefore it stores data as long as power is on. RAM is also known as RWM (i.e. Read Write Memory). If a RAM chip has n address input lines then it can access memory locations upto 2ⁿ.

7. The n-bit address is placed in the __________
A. MBR
B. MAR
C. RAM
D. ROM
Answer: B
Clarification: The n-bit address is placed in the Memory Address Register (MAR) to select one of 2ⁿ memory locations. It stores the address of the instruction which is to be executed next.

8. Which of the following control signals are selected for read and write operations in a RAM?
A. Data buffer
B. Chip select
C. Read and write
D. Memory