WorksheetsDigital Electronics Quiz
Total questions: 42
Worksheet time: 21mins
Name
Class
Date
1.
Name :-
4 lines
2.
Mobile Number :-
4 lines
3.
Roll Number :-
4 lines
4.
Section :-
a)
A
b)
B
5.
1) What is the binary equivalent of the decimal number 368
a)
(A) 101110000
b)
(B) 110110000
c)
(C) 111010000
d)
(D) 111100000
6.
2) (734)8 = ( )16
a)
(A) C 1 D
b)
(B) 1 C D
c)
(C) D C 1
d)
(D) 1 D C
7.
3)The Gray code for decimal number 8 is equivalent to
a)
(A) 1100
b)
(B) 1001
c)
(C) 0101
d)
(D) 0110
8.
4) The output of a logic gate is 1 when all its inputs are at logic 0. the gate is either
a)
(A) a NAND or an EX-OR
b)
(B) an OR or an EX-NOR
c)
(C) an AND or an EX-OR
d)
(D) a NOR or an EX-NOR
9.
5) The 2’s complement of the number 1101101 is
a)
(A) 0101110
b)
(B) 0111110
c)
(C) 0110010
d)
(D) 0010011
10.
6) The output will be a LOW for any case when one or more inputs are zero in a/an …………
a)
(A)NOT Gate
b)
(B) NAND Gate
c)
(C)AND Gate
d)
(D)OR Gate
11.
7) The octal equivalent of the decimal number (417)10 is _____
a)
(A) 641
b)
(B)642
c)
(C) 483
d)
(D) 484
12.
8)In boolean algebra, the OR operation is performed by which properties?
a)
(A) Associative properties
b)
(B) Commutative properties
c)
(C) Distributive properties
d)
(D) All of the Mentioned
13.
9)The boolean function A + BC is a reduced form of ____________
a)
(A) AB + BC
b)
(B) A’B + AB’C
c)
(C) (A + C)B
d)
(D) (A + B)(A + C)
14.
10)Which Boolean algebra property allows us to group operands in an expression in any order without affecting the results of the operation [for example, A + B = B + A ?
a)
(A) Distributive
b)
(B) None of Above
c)
(C) Associative
d)
(D) Commutative
15.
11) The terms in POS are called ___________
a)
(A) min terms
b)
(B) max terms
c)
(C) Mid term
16.
12) Which of the following is an incorrect SOP expression?
a)
(A) x+y
b)
(B) x
c)
(C) (x+y)(x+z)
d)
(D) x+x.y
17.
13) The corresponding min term when x=1, y=1 and z=0.
a)
(A) x.y.z’
b)
(B) X+Y+Z’
c)
(C) x'y'z
d)
(D) X’+Y’+Z
18.
14) Which operation is shown in the following expression: (X+Y’).(X+Z).(Z’+Y’)
a)
(A) NOR
b)
(B) SOP
c)
(C) POS
d)
(D) EX-OR
19.
15) The gates required to build a half adder are
a)
(A) EX-OR gate and NOR gate
b)
(B) EX-OR gate and OR gate
c)
(C) EX-OR gate and AND gate
d)
(D) Four NAND gates.
20.
16) The correction to be applied in decimal adder to the generated sum is
a)
(A) 0101
b)
(B) 0110
c)
(C) 1101
d)
(D) 1010
21.
17) A full adder logic circuit will have
a)
A) Two inputs and one output.
b)
(B) Three inputs and three outputs.
c)
(C) Two inputs and two outputs.
d)
(D) Three inputs and two outputs.
22.
18) If A and B are the inputs of a half adder, the carry is given by __________
a)
(A) A AND B
b)
(B) A OR B
c)
(C) A XOR B
d)
(D) A EX-NOR B
23.
19) A device which converts BCD to Seven Segment is called
a)
(A) Encoder
b)
(B) Decoder
c)
(C) Multiplexer
d)
(D) Demultiplexer
24.
20) How many select lines will a 16 to 1 multiplexer will have
a)
(A) 4
b)
(B) 3
c)
(C) 5
d)
(D) 1
25.
21) The commercially available 8-input multiplexer integrated circuit in the TTL family is
a)
(A) 7495.
b)
(B) 74153.
c)
(C) 74154.
d)
(D) 74151.
26.
22) How is a J-K flip-flop made to toggle?
a)
(A) J = 0, K = 0
b)
(B) J = 1, K = 0
c)
(C) J = 0, K = 1
d)
(D) J = 1, K = 1
27.
23) If an active-HIGH S-R latch has a 0 on the S input and a 1 on the R input and then the R input goes to 0, the latch will be ________.
a)
(A)SET
b)
(B) RESET
c)
(C) clear
d)
(D) invalid
28.
24) In S-R flip-flop, if Q = 0 the output is said to be ___________
a)
(A) Set
b)
(B) Reset
c)
(C) Previous state
d)
(D) Current state
29.
25) What is a multiplexer?
a)
(A) It is a type of decoder which decodes several inputs and gives one output
b)
(B) A multiplexer is a device which converts many signals into one
c)
(C) It takes one input and results into many output
d)
(D) It is a type of encoder which decodes several inputs and gives one output
30.
26) In the given 4-to-1 multiplexer, if c1 = 0 and c0 = 1 then the output M is ___________
a)
(A) X0
b)
(B) X1
c)
(C) X2
d)
(D) X3
31.
27) If we record any music in any recorder, such types of process is called ___________
a)
(A) Multiplexing
b)
(B) Encoding
c)
(C) Decoding
d)
(D) Demultiplexing
32.
28) In which Flip Flop Race Around condition occurs.
a)
(A) SR FF
b)
(B) JK FF
c)
(C) D FF
d)
(D) T FF
33.
29)Racing condition occur in which flip flop.
a)
(A) SR FF
b)
(B) JK FF
c)
(C) D FF
d)
(D) T FF
34.
30) Which one of the following is volatile in nature?
a)
(A) ROM
b)
(B) EROM
c)
(C) PROM
d)
(D) RAM
35.
31) ASCII value for A in binary is
a)
(A) 1000001
b)
(B) 1010000
c)
(C) 1010101
d)
(D) 1100110
36.
32) How many outputs will a decimal-to-BCD encoder have?
a)
(A) 4
b)
(B) 8
c)
(C) 12
d)
(D) 16
e)
37.
33) In 1-to-4 demultiplexer, how many select lines are required?
a)
(A) 2
b)
(B) 3
c)
(C) 4
d)
(D)5
38.
34) Why is a demultiplexer called a data distributor?
a)
(A) The input will be distributed to one of the outputs
b)
(B) One of the inputs will be selected for the output
c)
(C) The output will be distributed to one of the inputs
d)
(D) Single input to Single Output
39.
35) Reflected binary code is also known as ___________
a)
(A) BCD code
b)
(B) Binary code
c)
(C) ASCII code
d)
(D) Gray Code
40.
36) If A, B and C are the inputs of a full adder then the carry is given by __________
a)
(A) (A AND B) OR (A AND C) OR(B AND C)
b)
(B) A OR B OR (A AND B) C
c)
(C) (A AND B) OR (A AND B)C
d)
(D) A XOR B XOR (A XOR B) AND C
41.
37) Carry Propagate(Pi) Equation in Carry Look ahead adder is
a)
(A) A EX-OR B
b)
(B) A AND B
c)
(C) A EX-NOR B
d)
(D) None
42.
38 ) Let A and B is the input of a subtractor then the borrow will be ___________
a)
(A) A AND B’
b)
(B) A’ AND B
c)
(C) A OR B
d)
(D) A AND B
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