1. Computers Essentially Follow the Following Number System

Module1 Number system

1. Computers essentially follow the following number system

a. Décimal

b. Octal

c. Binary

d. hexadécimal

Ans: c

2. Number of digits in décimal system are

a. 2

b.10

c.16

d.8

Ans: b

3. Number of digits in a binary system are

a. 2

b.10

c.16

d.8

Ans: a

4. Number of digits in a hexadecimal system are

a. 2

b.10

c.16

d.8

Ans: c

5. Hardware means programmes-true or false

Ans: False

6. Software means programmes-true or false

Ans: True

7. Radix of number system is its

a. Powers

b. Number of digits it has

c. Weights of numbers

d. None of above

Ans: b

8. BCD is represented as a string of

a. 8 bits

b. 16 bits

c. 2 bits

d. 4 bits

Ans: d

9. ACSII code is used to standardise

a. Software

b. input output hardware

c. Firmware

d. None of above

Ans: b

10. What is a decimal equivalent of 1011

a. 10

b. 9

c. 13

d. 11

Ans: d

11. What is a binary equivalent of 14

a. 1110

b. 1011

c. 1101

d. 0111

Ans: a

12. What is the hexadecimal equivalent of 10101111

a. 9A

b. 8F

c. 9F

d. F9

Ans: c

13. What is the binary equivalent of 7C

a. 11101100

b. 01111100

c. 01110011

d. 11000111

Ans: b

Module~2

1) The gate which has no input is

a) AND

b) OR

c) NOT

d) X-OR

Ans (c)

2) If one input signal is high and other input signals can either be high or low, the output is high. The gate is

a) OR

b) AND

c) NOR

d) NOT

Ans (a)

3) If one input signal is less and other input signal can either be high or low, the output is low. the gate is

a) OR

b) AND

c) NAND

d) NOT

Ans (b)

4) When all input are low and the output is high, the gate is

a) NAND

b) AND

c) OR

d) NOR

Ans (d)

5) When all the input are high and the output is low, the type of the gate is

a) NAND

b) AND

c) OR

d) NOR

Ans (a)

6) When both input of a low input gate is similar and the output is high, the type of the gate is

a) NAND

b) NOR

c) Exclusive OR

d) AND

Ans (c)

7) The equation of NAND gate is

a) X = A + B

b) X = AB

c) X = (A+B)*

d) X = (AB)*

Ans (d)

8) The equation of exclusive OR gate is

a) Y = AB

b) Y = A+B

c) Y = (A)*

d) Y= A+B

Ans (c)

9) The equation of NAND gate is

a) Y = A+B

b) Y = (A+B)*

c) Y= (A)*B + A(B)*

d) Y = AB

Ans (d)

1- In an half adder sum =

a) A+B

b)A.B

c)A + B...

d)A + B

Ans : (c)

2- In a half adder carry =

a) A+B

b)A.B

c)A + B...

d)A + B

Ans : (b)

3- Half adder has

a) one input & one output

b) two inputs & one output

c) three inputs & two outputs

d) two inputs & two outputs

Ans : (d)

4- A full adder has

a) one input & one output

b) two inputs & one output

c) three inputs & two outputs

d) two inputs & two outputs

Ans : (c)

5- In full adder the sum =

a)A + -B + C

b)A+B+C

c)AB+AC+BC

d)AB+BC

Ans : (a)

6- In full adder the carry =

a)A + -B + C

b)A+B+C

c)AB+AC+BC

d)AB+BC

Ans : (c)

7- 1's complement of 1100 is

a)1001

b)0110

c)0011

d)0100

Ans : (c)

8- 2's complement of 1100 is

a)1001

b)0110

c)0011

d)0100

Ans : (d)

9- If 2's complement is taken twice for a number we get

a) 1's complement of original number

b) 2's complement of original number

c) original number

d) unknown number

Ans : (c)

10- In a 2's complement adder subtracter when SUB is low, acts as subtratcter - True or False

Ans : False

11- In a 2's complement adder subtracter when SUB is high, acts as subtratcter - True or False

Ans : True

12- The binary addition 1+1 is

a) sum is 0

b) carry is 1

c) sum is 0 and carry is 1

d) sum is 1 and carry is 0

Ans : (c)

13- 3 in binary is added as

a) 011

b) 111

c) 0111

d) 1011

Ans : (d)

14- Double 2's complement of a number result is

a) original number

b) complement number

c) 0

d) None of the above

Ans : (a)

Module 4

1. Flip flop or a lactch is

(a) Arithmetic element

(b) Logic element

(d) Output inputr elelment

Answer : (c)

2. the number of stable states in a Flip-Flop

(a) 1

(b) 2

(d) 4

Answer: (b)

3. race condition in a Flip-Flop occurs when

(a) R is low & S is high

(b) R is high & S is slow

(d) both R&S are high

Answer: (d)

4. D latches remove the possibility of a race condition – True or False

Answer : true

5. R S Flip-Flop are used as switch debouncer –True or False

Answer : true

6. Edge triggering means Flip-Flop responds only when

(a) clock do not change states

(b) clock changes states

(d) clock goes low

Answer : (b)

7. number of clocked latches in a master salve Flip-Flop are

(a) 1

(b) 2

(d) 4

Answer :(b)

8. Number of transistor required to construct a latch are

(a)1

(b)2

(d)4

Answer : (c)

9.RS latch can be used as switch debounder

(a) true

(b)false

Answer : (a)

10.Racing means

(a) Toggling once

(b) No toggling

(d) None of above

Answer : (c)

11.when clock is master slaveJK flip-flop is high

(a) master is active and slave is inactive

(b) both master and slave are active

(d) both master and slave are inactive

Answer : (a)

12. When clock is master slave JK flip-flop is high

(a) master is active and slave is inactive

(b) both master and slave are active

(d) both master and slave are inactive

Answer:(c)

Module 5

Questions:

1.Following things are stored in computer memory

(a) program only

(b) data only

Ans: (c)

2. ROM is a

(a) volatile memory

(b) non volatile memory

(d) neither volatile nor non volatile memory

Ans: (b)

3. Random access memory is a

(a) volatile memory

(b) non volatile memory

(d) neither volatile nor non volatile memory

Ans: (a)

4. Data on a E PROM is

(a) non erasable

(b) not programmable

(d) none of the above

Ans: (c)

5. Random access memory can also be called as

(a) read only memory

(b) write only memory

(d) read-write memory

Ans: (d)

6. Dynamic RAMs require refresh signal – True or False

Ans: True

7. Static RAMs require refresh signal – True or False

Ans: False

QUESTIONS ON MICROPROCESSOR – 8085

1. Microprocessor is

(a) Mini computer

(b) Mainframe computer

(d) None of the above

Answer (c)

2. Number of data bits in 8085 are

(a) 4

(b) 8

(d) 16

Answer (b)

3. Number of address bits in 8085 are

(a) 4

(b) 8

(d) 16

Answer (d)

4. ALU carries out

(a) Arithmetic operations only

(b) Both arithmetic and logic operations

(d) Logic operations only

Answer (d)

5. Registers are used for

(a) Temporary storage

(b) Permanent storage

(d) Logic operations

Answer (a)

6. Interrupt control stops the computers for the moment what it is doing

(a) True

(b) False

Answer (a)

7. Number of pins in 8085 are

(a) 16

(b) 8

(d) 40

Answer (d).