Boolean Algebra Quiz

---

1. In Boolean Algebra A.1= ?

A. 1
B. A
C. 0
D. NaN (Not a Number)


Click for answer 

B. A

2. Using Boolean Algebra, A.0 =?

A. A
B. 0
C. 1
D. Undefined


Click for answer 

B. 0

3. A.A= ?

A. A
B. 1
C. 0
D. Can't say


Click for answer 

A. A

4. A+0= ?

A. 1
B. 0
C. A
D. Undefined


Click for answer 

C. A

5. Boolean algebra allows _______possible values.

A. only one
B. only two
C. three
D. eight


Click for answer 

B. only two

6. In Boolean algebra, A.(A+B) =?

A. 0
B. 1
C. A
D. B


Click for answer 

C. A

7. A + A.B= ?

A. 0
B. 1
C. A
D. B


Click for answer 

C. A

8. A.(B+C)= AB + AC represents which law in Boolean algebra ?

A. distributive law
B. associative law
C. commutative law
D. None of the above


Click for answer 

A. distributive law

9. According to De Morgan's theorem:
NAND = __________________________-.

A. bubbled OR
B. bubbled NOR
C. bubbled NAND
D. bubbled AND


Click for answer 

D. bubbled AND

10. (A.B).C = A.(B.C) represents which law in Boolean algebra ?

A. De Morgan's theorem
B. distributive law
C. associative law
D. commutative law


Click for answer 

C. associative law

Read more ...

Digital Electronics Quiz

1. D- flip flop can be used as _________________.

A. A delay switch
B. Differentiator
C. Divider Circuit
D. All of the above

Click for answer 

A. A delay switch

2. The _________________ gates are known as "Universal Gates".

A. NAND and NOR
B. NAND and AND
C. AND and OR
D. EX-NOR and EX-OR

Click for answer 

A. NAND and NOR

3. Which of the following circuits selects one of the n data inputs and routes it to the output?

A. Flip-Flop
B. Multiplexer
C. Demultiplexer
D. Decoder

Click for answer 

B. Multiplexer

4. How many bytes does a 48K computer memory contain ?

A. 49152
B. 48000
C. 48152
D. 47152

Click for answer 

A. 49152

5. The refreshing range of dynamic RAMs is in the range of _____________.

A. 2 milliseconds
B. 2 milliseconds
C. 50 milliseconds
D. 500 milliseconds

Click for answer 

A. 2 milliseconds

6. IC 7408 represents

A. 2-input AND Gate
B. 3-input AND Gate
C. 2-input OR Gate
D. 2-input NAND Gate

Click for answer

A. 2-input AND Gate

7. In Integrated circuit technologies, LSI stands for

A. Very Large Scale Integration
B. Large Scale Integration
C. Large Symbolic Integration
D. Long Size Integration

Click for answer

B. Large Scale Integration

8. SIPO stands for

A. Shift register input and parallel output
B. Sequential input and processed output
C. Serial input parallel output
D. Sequential input and parity output

Click for answer 

C. Serial input parallel output

9. PIPO mode needs following clock pulses to load a 6-bit number into a register

A. 1
B. 2
C. 3
D. 4

Click for answer 

A. 1

10. In shift register 8 bit binary number is to be shifted into 8 Flip-Flop shift register, following number of clock pulses will be required to complete this operation

A. 4
B. 8
C. 16
D. 32

Click for answer 

D. 32

Read more ...

Logic Gates Quiz

1.An AND gate will function as OR if

A. either of the inputs is “1”
B. all the inputs and outputs are complemented.
C. all the inputs are ‘0’
D. all the inputs to the gates are “1”

Click for answer

B. all the inputs and outputs are complemented.

2. The number of inputs and outputs in a full adder are

A. 2 and 1
B. 2 and 2
C. 3 and 2
D. 3 and 3

Click for answer

C. 3 and 2

3. Which device has one input and many outputs

A. flip flop
B. multiplexer
C. demultiplexer
D. counter

Click for answer

C. demultiplexer

4. An OR gate has 6 inputs. The number of input words in its truth table are

A. 6
B. 32
C. 64
D. 128


Click for answer

C. 64

5. A flip flop is a ____________

A. memory element.
B. logical element
C. arithmetic element
D. combinational circuit

Click for answer

A. memory element

6.In case of OR gate, no matter what the number of inputs, a

A. 0 any input causes the output to be at logic 0
B. 0 at any input causes the output to be at logic 1.
C. 1 at any input causes the output to be at logic 0
D. 1 at any input causes the output to be at logic 1

Click for answer 

D.1 at any input causes the output to be at logic 1

7.Which one of the following is a universal gate

A. NAND gate
B. AND Gate
C. OR Gate
D. EX-OR Gate

Click for answer 

A. NAND gate

8.Identify the logic gate given below.

A. OR gate
B. NOR Gate
C. NAND Gate
D. EX- NOR gate

Click for answer 

D. EX- NOR gate

9. A Flip flop can store__________.

A. 1 bit
B. 2 bits
C. 4 bits
D. 8 bits (1 byte)

Click for answer 

A. 1 bit

10. CRO is a

A. Cathode Ray Oscillator
B. Cathode Ray Oscilloscope
C. Capacitor-Resistor Oscillator
D. Capacitor-Resistor Output

Click for answer 

B. Cathode Ray Oscilloscope

Read more ...

Quiz based on Digital Electronics

1. A ring counter consisting of five flip flops will have ____________

A. 5 states
B. 10 states
C. 15 states
D. 32 states

Click for answer 

A. 5 states

2.A 4 bit down counter can count from ___________

A. 0000 to 1111
B. 000 to 111
C. 9999 to 0000
D. 1111 to 0000

Click for answer 

D. 1111 to 0000

3. In Boolean Algebra A.(A+B)=?

A. A+B
B. 0
C. A
D. B

Click for answer 

C. A

4. _____________ are the basic building block of all digital circuits.

A. Flip-flops
B. Transistors
C. Basic gates
D. MUX

Click for answer 

C. Basic gates

5. The example of sequential logic is_____

A. PROM
B. Sequence detector
C. ALU
D. Adder

Click for answer 

B. Sequence detector

6. Number of states in a decade counter is ______.

A. 32
B. 8
C. 16
D. 10

Click for answer 

D. 10

7.Following register allows movement of digital data in left or right direction.

A. Latch Register
B. Shift Register
C. Counter
D. Process Register

Click for answer 

B. Shift Register

8. The following gate output is zero when all the input levels applied is high.

A. EX-OR
B. NAND
C. EX-NOR
D. NOR

Click for answer 

B. NAND

9. Boolean algebra allows following number of levels

A. One
B. Two
C. Three
D. Four

Click for answer 

B. Two

10. A 8:1 multiplexer has __________ number of select lines.

A. one
B. two
C. three
D. four

Click for answer 

C. three

Read more ...

(Basics) Digital Electronics Quiz

1. A flip-flop is a _______.

A. memoy element
B. sequential circuit
C. combinational circuit
D. arithmetic element

Click for answer 

A. memoy element

2. In octal number system, the number after 7 is

A. 8
B. 10
C. 15
D. A

Click for answer 

B. 10

3. Following is example of combinational logic circuit

A. ALU
B. Ripple Counter
C. Sequence detector
D. Shift Register

Click for answer 

C. Sequence detector

4. The number of flip-flops needed to divide the input frequency by 32 is ____.

A. 2
B. 3
C. 4
D. 5

Click for answer 

C. 4

5. Which of the following is a self-complementing code ?

A. 8421 code
B. Excess 3 code
C. Pure binary code
D. Gray Code

Click for answer 

D. Gray Code

6. With 4 Boolean variables, how many Boolean expressions can be formed ?

A. 16
B. 156
C. 1024 (1K)
D. 64*1024 (64K)

Click for answer 

D. 64*1024 (64K)

7. How is the inversion achieved using EXOR gate ?

A. Giving input signal to the two input lines of the gate tied together
B. Giving input signal to one input line and logic zero at the other line
C. Giving input signal to one input line and logic one at the other line
D. Inversion cannot be achieved using EXOR gate

Click for answer 

C. Giving input signal to one input line and logic one at the other line

8. Which of the following cicuits can be used as parallel-to-serial converter?

A. Multiplexer
B. Demultiplexer
C. Digital Counter
D. Decoder

Click for answer 

A. Multiplexer

9. A number is expressed in binary two's complement as 10011. Its decimal equivalent value is

A. 19
B. 13
C. -19
D. -13

Click for answer 

D. -13

10. Flash ADC is

A. a serial ADC
B. a parallel ADC
C. partly serial and partly parallel ADC
D. successive approximation ADC

Click for answer 

B. a parallel ADC

Read more ...