COA-C1 Quiz 1 Fall Sem 2025

1. Which logic gate has the output 1 only when all its inputs are 1?

• A) OR gate

• B) AND gate
  

• C) NOT gate
  

• D) XOR gate

3. Which logic gate produces the complement of the input?

• A) OR gate
  

• B) NOT gate
  

• C) NAND gate
  

• D) AND gate

The JK flip-flop avoids the invalid state problem of the SR flip-flop by:

• A) Ignoring inputs when both are 1
  

• B) Using an inverter at the output
  

• C) Toggling the output when J = K = 1
  

• D) Setting output to 0 always

In a computer, the program counter (PC) holds:

• A) The address of the next instruction to be executed
  

• B) The data to be processed
  

• C) The result of the last operation
  

• D) The starting address of RAM

Accumulator register is mainly used for:

• A) Holding memory addresses
  

• B) Storing intermediate arithmetic and logical results
  

• C) Controlling input/output devices
  

• D) Storing machine instructions

The instruction MOV A, B belongs to which type of operation?

• A) Arithmetic operation
  

• B) Logical operation
  

• C) Data transfer operation
  

• D) Control operation

In a one-address instruction format, the address part usually refers to:

• A) A memory operand, and the other operand is implied (Accumulator)
  

• B) Two memory operands
  

• C) A stack pointer
  D) Program counter

• 
  D) Program counter

In a zero-address instruction format, the operands are usually found in:

• A) General purpose registers
  

• B) Main memory
  

• C) A stack (Push/Pop operations)
  

• D) Instruction register

In which addressing mode is the operand given directly in the instruction?

• A) Immediate addressing
  

• B) Direct addressing
  

• C) Indirect addressing
  

• D) Register addressing

Which of the following is a characteristic of RISC architecture?

• A) Large number of complex instructions
  

• B) Simple instructions that execute in one clock cycle
  

• C) Variable instruction length
  

• D) Emphasis on hardware complexity