1. In which of the following addressing modes the operand value is directly specified ?
Immediate

Direct

Register direct

Relative

2. What is the number of inputs and outputs of a half adder ?
2 inputs and 1 output

2 inputs and 2 outputs

3 inputs and 2 outputs

2 inputs and 3 outputs

3. A digital computer has a common bus system for 16 registers of 32 bit each the bus is constructed with multiplexers, How many selections inputs are there in each multiplexer?
4

16

3

15

4. A digital computer has a common bus system for 16 registers of 32 bit each the bus is constructed with multiplexers, How many multiplexers are there?
4

16

32

48

5. Which of the following is used to store data in registers ?
D flip flop

JK flip flop

RS flip flop

T flip flop

6. In a adder- subtractor circuit find the value of Sum and Carry out , given M= 1, A=0101, B=1010 ?
Sum = 1101 , Carry = 0

Sum = 0100 , Carry = 1

Sum = 0001 , Carry = 1

Sum = 1011 , Carry = 0

7. In a adder- subtractor circuit find the value of Sum and Carry out , given M= 0, A=1000, B=1001 ?
Sum = 1101 , Carry = 0

Sum = 0001 , Carry = 1

Sum = 1101 , Carry = 1

Sum = 0001 , Carry = 0

8. In a adder- subtractor circuit find the value of Sum and Carry out , given M= 1, A=1100, B=1000 ?
Sum = 1101 , Carry = 0

Sum = 1110 , Carry = 1

Sum = 0100 , Carry = 1

Sum = 0101, Carry = 0

9. Given R1 = 1010, R2 = 1111, y= 1 and T = 1 what are the contents of R1 and R2 after following register transfer operation: yT: R2<- R1
R1 = 0000 , R2= 1010

R1 = 1010 , R2= 1111

R1 = 1111 , R2= 1010

R1 = 1010 , R2= 1010

10. Given R1 = 1010, R2 = 1111, y= 0 and T = 0 what are the contents of R1 and R2 after following register transfer operation: yT: R2<- R1
R1 = 0000 , R2= 1010

R1 = 1111 , R2= 1010

R1 = 1010, R2 = 1111

R1 = 1010 , R2= 1010

11. Given R1 = 1010, R2 = 1111, y= 0 and T = 1 what are the contents of R1 and R2 after following register transfer operation: yT: R2<- R1
R1 = 0000 , R2= 1010

R1 = 1010, R2 = 1111

R1 = 1111 , R2= 1010

R1 = 1010 , R2= 1010

12. Given R1 = 1010, R2 = 1111, y= 1 and T = 0 what are the contents of R1 and R2 after following register transfer operation: yT: R2<- R1
0000 , R2= 1010

R1 = 1111 , R2= 1010

R1 = 1010, R2 = 1111

R1 = 1010 , R2= 1111

13. 2. A digital computer has a common bus system for 16 registers of 32 bits each . Bus is constructed with multiplexers. How many selection inputs are there in each multiplexers?
4 selection lines

8 selection lines

16 selection lines

32 selection lines

14. Register A holds the 8 bit binary 11011001. Determine B and the operation to be performed to change the value of A to 01110101
Selective complement and B = 10101100

Selective set and B = 10101010

Selective clear and B = 11001010

Mask and B = 11001100

15. Register A holds the 8 bit binary 11011001. Determine B and the operation to be performed to change the value of A to 11111101
Selective complement and B = 11011011

Selective set and B = 00100100

Selective clear and B = 00100100

Mask and B = 11001100