1. A machine language instruction format consists of
a) Operand field
b) Operation code field
c) Operation code field & operand field
d) none of the mentioned
Explanation: Machine language instruction format has both the fields.
2. The length of the one-byte instruction is
a) 2 bytes
b) 1 byte
c) 3 bytes
d) 4 bytes
Explanation: This format is only one byte long.
3. The instruction format ‘register to register’ has a length of
a) 2 bytes
b) 1 byte
c) 3 bytes
d) 4 bytes
Explanation: This format is 2 bytes long.
4. The R/M field in a machine instruction format specifies
a) another register
b) another memory location
c) other operands
d) all of the mentioned
Explanation: The LSBs(least significant bits) from 0 to 3 represent R/M field that specifies another register or memory location i.e. the other operand.
5. In a machine instruction format, S-bit is the
a) status bit
b) sign bit
c) sign extension bit
d) none of the mentioned
Explanation: The S-bit known as sign extension bit is used along with W-bit to show the type of operation.
6. The bit which is used by the ‘REP’ instruction is
a) W-bit
b) S-bit
c) V-bit
d) Z-bit
Explanation: The Z-bit is used by the REP instruction to control the loop.
7. If a W-bit value is ‘1’ then the operand is of
a) 8 bits
b) 4 bits
c) 16 bits
d) 2 bits
Explanation: If W-bit is ‘1’ then the operand is of 16-bits, and if it is ‘0’ then the operand is of 8-bits.
8. The instructions which after execution transfer control to the next instruction in the sequence are called
a) Sequential control flow instructions
b) control transfer instructions
c) Sequential control flow & control transfer instructions
d) none of the mentioned
Explanation: The sequential control flow instructions follow sequence order in their execution.
9. The instructions that transfer the control to some predefined address or the address specified in the instruction are called as
a) sequential control flow instructions
b) control transfer instructions
c) sequential control flow & control transfer instructions
d) none of the mentioned
Explanation: The control transfer instructions transfer control to the specified address.
10. The instruction “JUMP” belongs to
a) sequential control flow instructions
b) control transfer instructions
c) branch instructions
d) control transfer & branch instructions
Explanation: The JUMP instruction transfers the control to the address located in the instruction.