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Worksheets

PLTW DE

Total questions: 127

Worksheet time: 2hrs 35mins

Name
Class
Date
1.
What is the output of an OR gate if the inputs are 1 and 0?
a)
0
b)
1
c)
OFF
d)
2
2.
What is the output of an AND gate if the inputs are 1 and 0?
a)
ON
b)
2
c)
1
d)
0
3.
A NOT gate has…
a)
Two inputs and one output
b)
One input and one output
c)
One input and two outputs
d)
Two inputs and two outputs
4.
An OR gate has
a)
Two inputs and one output
b)
One input and one output
c)
One input and two outputs
d)
Two inputs and two outputs
5.
A logic state can only be….
a)
On or 1
b)
Off or 1
c)
1 or 0
d)
In and Out
6.
The output of a ________ gate is only 1 when both inputs are 1.
a)
OR
b)
NOT
c)
NAND
d)
AND
7.
What logic gate is this?
a)
AND
b)
OR 
c)
NOT
d)
TO
8.
What gate is this table for?
a)
AND
b)
OR
c)
NOT
d)
NOR
9.

Which logic gate is this?

a)

AND

b)

OR

c)

XOR

d)

NOT

10.

What will the circuit's output be?

a)

1

b)

0

11.
What kind of gate is this?
a)
NOR
b)
NAND
c)
OR
d)
XOR
12.
The output of an AND gate is LOW ________.
a)
all the time
b)
when any input is HIGH
c)
when all inputs are HIGH
d)
when any input is LOW
13.

Which Logic gate does this Truth Table represent?

a)

AND Gate

b)

OR Gate

c)

NOT Gate

d)

NAND Gate

14.

Which logic gate is shown?

a)

NOR Gate

b)

XOR Gate

c)

XNor Gate

d)

AND Gate

e)

NAND gate

15.

Which logic gate is shown?

a)

AND gate

b)

OR gate

c)

NOT gate

d)

NOR gate

16.

What gate is represented by the truth table shown?

a)

NOR gate

b)

NOT gate

c)

AND gate

d)

XOR gate

17.
A logic state can only be….
a)
On or 1
b)
Off or 1
c)
1 or 0
d)
In and Out
18.

Convert the binary number 01011 into decimal

a)

10

b)

11

c)

13

d)

12

19.

The NOR Gate is OR Gate followed by ...............

a)

OR Gate

b)

NOT Gate

c)

AND Gate

d)

None of the above

20.

What is the meaning of 0 in a Digital signal?

a)

Max possible value

b)

No current/voltage

c)

A light On

d)

A light Off

21.

Which are UNIVERSAL GATES?

a)

AND gate and OR gate

b)

NAND gate and NOR gate

c)

XOR gate and XNOR gate

d)

NOT gate

22.

Which of the following statements is TRUE for an OR Gate:

a)

A '1' at any of the inputs causes the output to be '1'

b)

A '1' at any of the inputs causes the output to be '0'

c)

A '0' at any of the inputs causes the output to be '0'

d)

A '0' at any of the inputs causes the output to be '1'

23.

Which is the correct order of sequence for representing inputs in K-map

a)

(00,01,10,11)

b)

(00,01,11,10)

c)

(00,10,11,01)

d)

(00,11,01,10)

24.

For staircase wiring (one lamp controlled by two switches), which logic function can be used to realize the application?

a)

AND Gate

b)

OR Gate

c)

XOR Gate

d)

NOR Gate

25.

The output of this combinational circuit is:

a)

A+B+C

b)

A(B+C)

c)

B(C+A)

d)

C(A+B)

26.

In the figure shown, the output ܻ is required to be ܻ Y=AB+ C'D'. The gates G1 and G2 must be, respectively:

a)

NOR, OR

b)

NAND, OR

c)

AND, NAND

d)

NAND, NOR

27.

The Boolean expression (X+Y) (X+Y')+(XY')'+(X')'simplifies to:

a)

X

b)

XY

c)

X+Y

d)

Y

28.

The Boolean expression for the truth table shown (D is the output) is :

a)

B(A+C) (A` +C`)

b)

B(A+C`)(A`+C)

29.

A subtractor subtracts the subtrahend from the minuend

a)

True

b)

False

30.

A priority encoder is a sequential circuit

a)

True

b)

False

31.

How many select lines does a 16:1 MUX require?

a)

4

b)

3

c)

8

d)

2

32.

Can a decoder be used as a DMUX

a)

Yes

b)

No

33.

In active low logic, logic 0 is considered as logic 1

a)

True

b)

False

34.

Which flip flop is used for designing counters?

a)

T Flip Flop

b)

D Flip Flop

c)

T Latch

d)

D Latch

35.

Which MATH function does an XOR gate perform

a)

Addition

b)

Multiplication

36.

Which Logic gate does this Truth Table represent?

a)

AND Gate

b)

OR Gate

c)

NOT Gate

d)

NAND Gate

37.

Which logic gate is shown?

a)

NOR Gate

b)

XOR Gate

c)

XNor Gate

d)

AND Gate

e)

NAND gate

38.

Which logic gate is shown?

a)

NOR gate

b)

NAND gate

c)

OR gate

d)

NOT gate

39.

Which logic gate is shown?

a)

AND gate

b)

OR gate

c)

NOT gate

d)

NOR gate

40.

What gate is represented by the truth table shown?

a)

NOR gate

b)

NOT gate

c)

AND gate

d)

XOR gate

41.

Which logic gate is shown?

a)

AND gate

b)

XOR gate

c)

OR gate

d)

NOT gate

42.

Which logic gate is represented by the truth table shown?

a)

AND gate

b)

Xor gate

c)

XNOR gate

d)

NAND gate

43.

Which logic gate does the truth table shown represent?

a)

OR gate

b)

NAND gate

c)

XNOR gate

d)

XOR gate

44.

1101 + 1001 = ?

a)

11001

b)

11001

c)

101010

d)

10110

45.

Your partner has been working on your group’s circuit and has le the wo you begin working on the circuit, what should you do to ensure that the c and prevent yourself from getting a shock?

a)

Disconnect the power source.

b)

Measure the circuit with an ohmmeter for resistance.

c)

Check the circuit with a continuity tester.

d)

Use a voltmeter to measure voltage at the power source.

46.

You used a tool and it inadvertently became damaged. What should be the next action for you to take?

a)

Continue using the tool as long as it still somewhat works. 

b)

Label the tool that is broken and inform the instructor. 

c)

Throw the tool away. 

d)

Put the tool away and find another tool to use. 

47.

If you have not been given instruction on a tool or piece of equipment in the laboratory, you should:

a)

Not use the tool until you have had proper instruction. 

b)

Use it anyway if you think you can figure it out. 

c)

Ask a classmate how to use it. 

d)

Have another classmate (who has also not had instruction) do it for you. 

48.

Which of the following is appropriate for working in an electronics workspace?

a)

Wearing multiple rings on your fingers. 

b)

Wearing an oversized, baggy hoodie sweatshirt. 

c)

Clothing that is not loose and no jewelry. 

d)

Dragging your feet on the carpet and shocking your friends. 

49.

Chemicals can be used to etch circuit board. Which of the following should be done before using the chemicals in an electronic classroom?

a)

Read all instructions that come with the chemical. 

b)

Read the Safety Data Sheet to prepare for emergencies. 

c)

Wear goggles and a lab coat to protect from potential spills. 

d)

All of the above. 

50.

What is the maximum current level that a human body can withstand before sustaining injury?

a)

100 uA

b)

1.0 mA

c)

15 mA

d)

50 mA

51.

A large voltage is applied to a circuit and a fire is started on a circuit board in the lab. When you inform your instructor, which of the following should the instructor use to extinguish an electrical fire?

a)

Water

b)

Class A fire extinguisher

c)

Class B fire extinguisher

d)

Class C fire extinguisher

52.

Before working with a chemical or solder, a student obtained a Safety DataSheet.  Which of the following will the student find on this document?

a)

What the chemical is made of. 

b)

The first aid procedure that you should follow. 

c)

How to handle the material.

d)

All of the above. 

53.

Which of the following is the appropriate scenario for wearing safety glasses in anelectronics classroom?

a)

Safety glasses or goggles should be worn to prevent eye injuries from chemicals that splash. 

b)

Safety glasses or goggles should be worn when using tools that may cause objects to be thrown. 

c)

Safety glasses or goggles should be used when soldering components. 

d)

All of the above. 

54.

Why should the students not rush? Why should students take their time when working in an electronics classroom?

a)

Taking your time allows you to double check your connections and reduce the need for troubleshooting later. 

b)

Taking your time allows you to create your circuits more neatly. This allows you to pick up where you left off last time more easily. 

c)

Taking your time allows you to double check all part numbers and values. A common error. 

d)

All of the above. 

55.

What are the types of injury that are most common in an electronics classroom?

a)

Electrical shock.

b)

Minor burn from active electrical components or a soldering iron.

c)

Puncture from a wire.

d)

All of the above.

56.

The electrical cord for a soldering iron has a grounding prong. However theextension cord you are trying to plug into only has only a place for 2 prongs(no grounding prong). What should you do in order to plug in the tool?

a)

Wire grounding prong to the neutral prong on the soldering iron. 

b)

Use an appropriate adapter/extension cord. 

c)

Cut off the grounding pin. 

d)

All of the above. 

57.

When you enter the electronics classroom, you notice there is water on the floornear an electrical outlet.  The roof appears to be leaking. Which of the following should be done first?

a)

Immediately mop the floor. 

b)

Make sure no one enters and turn the power off to the classroom at the circuit breaker. 

c)

Disregard the problem as long as it is not near projects workspace. 

d)

Mop the floor with an insulated mop. 

58.

You notice that the cord of your soldering iron is frayed and possibly broken.  What should be done next?

a)

If the cord works, continue to use the soldering iron. 

b)

Label the broken section and notify the instructor. 

c)

Put the soldering iron back and pick one without a frayed cord.

d)

Throw the soldering iron away. 

59.

A student obtained an injury in the electrical classroom. The accident should bebrought to the attention of the instructor so that:

a)

The teacher can document the injury.

b)

The teacher can administer first aid. 

c)

The teacher can make sure other students are not injured. 

d)

All of the above. 

60.

It is important to keep your workspace clean and organized in an electronicsclassroom.  Which of the following is a not a valid reason for this practice?

a)

This allows other classmates to easily locate materials when sharing the same workspace. 

b)

Minimizes potential for injuries. 

c)

These practices help maintain the equipment in the electronics classroom. 

d)

It gives students something to do. 

61.

Chemicals, materials, and processes in an electrical lab can be dangerous.  Which of the following is not a potential hazard in typical electronics classrooms?

a)

Burns from hot/active components or from the soldering iron. 

b)

Electrocution

c)

Fumes from soldering. 

d)

Falling objects. 

62.

Certain devices in an electronics classroom such as capacitors can store a lethalamount of charge. When handling a capacitor you will want to ensure that thedevice is uncharged. How do you make certain a capacitor is discharged beforehandling?

a)

Use the ammeter to read current. 

b)

Touch the leads with your finger. 

c)

Ask your instructor. 

d)

Use the ohmmeter to read resistance. 

63.

You are getting ready to power another student's electrical circuit in this class, but you are not sure of the voltage necessary to use. Students in this class should always use:

a)

5V because all of the components we use are always TTL.

b)

3.3V because all of the components we use are always CMOS. 

c)

9V because that is the battery lying next to the circuit. 

d)

Check with the other students who created it or the instructor. The design may require different voltage based on what it does and how it is designed. 

64.

Which of the following statements is good practice in an electronics classroom?

a)

Always follow procedure. 

b)

Investigate before you act. Read and review all datasheets and service manuals. 

c)

When in doubt, ask your instructor. 

d)

All of the above. 

65.

A base-10 number system that uses the digits 0-9

a)

decimal number

b)

binary code

c)

byte

d)

OR gate

66.

A base-2 number system that uses two digits, 0 and 1.

a)

decimal number

b)

binary code

c)

XOR gate

d)

ASCII

67.

American Standard Code for Information Exchange. A 7-bit code for representing alphanumeric and control characters.

a)

ASCII

b)

binary code

c)

digital number

d)

byte

68.

data represented as either yes/no or true/false

a)

digital

b)

decimal number

c)

ASCII

d)

binary code

69.

an electronic system that performs a logical operation on an input signal

a)

binary number

b)

digital numbers

c)

truth table

d)

logic gate

70.

a logic gate that changes its input logic level to the opposite state

a)

inverter (NOT gate)

b)

AND gate

c)

OR gate

d)

XOR gate

71.

a logic circuit whose output is 1 when all inputs are 1

a)

NOR gate

b)

AND gate

c)

NAND gate

d)

XOR gate

72.

a logic circuit whose output is 1 when at least one input is 1

a)

XOR gate

b)

NOR gate

c)

OR gate

d)

NOT gate

73.

a logic circuit whose output is 0 when all inputs are 1

a)

AND gate

b)

OR gate

c)

NOR gate

d)

NAND gate

74.

a logic circuit whose output is 0 when at least one output is 1

a)

NOR gate

b)

OR gate

c)

XOR gate

d)

NAND gate

75.

a logic circuit whose output is 1 when one input is 1, but not both

a)

OR gate

b)

AND gate

c)

XOR gate

d)

NAND gate

76.

a binary number 8 bits long

a)

binary code

b)

byte (bit)

c)

digital

d)

decimal number

77.

a table listing all possible inputs to a circuit and the corresponding outputs

a)

decimal numbers

b)

digital

c)

binary code

d)

truth table

78.

a device with multiple inputs and one output

a)

gate

b)

logic gate

c)

binary code

d)

digital

79.

What is the decimal equivalent of the binary number 1010?

a)

10

b)

12

c)

8

d)

5

80.

Which logic gate has an output of 1 only when all its inputs are 1?

a)

NOT gate

b)

OR gate

c)

NAND gate

d)

AND gate

81.

Simplify the Boolean expression: (A + B) * (A + C)

a)

A + A * C + B * A + B * C

b)

A * A + A * C + B * A + B * C

c)

(A + B) * (A + C)

d)

A * C + B * A + B * C

82.

What is the output of a half adder when the inputs are A = 1 and B = 0?

4 lines
83.

What is the purpose of a flip-flop in sequential circuits?

a)

The purpose of a flip-flop in sequential circuits is to perform mathematical calculations.

b)

The purpose of a flip-flop in sequential circuits is to amplify signals.

c)

The purpose of a flip-flop in sequential circuits is to store and remember a single bit of information.

d)

The purpose of a flip-flop in sequential circuits is to generate random numbers.

84.

Convert the decimal number 25 to binary.

a)

11001

b)

10010

c)

11111

d)

10101

85.

Which logic gate has an output of 0 only when all its inputs are 1?

a)

NAND

b)

AND

c)

OR

d)

XOR

86.

Simplify the Boolean expression: (A + B) * (A + C) + (B * C)

a)

A^2 + AB + AC + BC + B + C

b)

(A + B + C)^2

c)

A^2 + AB + AC + BC + B + C^2

d)

A^2 + AB + AC + BC + B * C

87.

What is the output of a full adder when the inputs are A = 1, B = 1, and Cin = 1?

a)

1

b)

0

c)

3

d)

2

88.

What is the difference between combinational and sequential circuits?

a)

Combinational circuits only depend on the current input, while sequential circuits depend on both the current and previous inputs.

b)

Combinational circuits are used for digital signals, while sequential circuits are used for analog signals.

c)

Combinational circuits and sequential circuits are the same thing.

d)

Combinational circuits depend on the current and previous inputs, while sequential circuits only depend on the current input.

89.

which of the following circuits can be used as parallel to serial converter?

a)

Multiplexer

b)

Demultiplexer

c)

Digital counter

d)

Decoder

90.

which device has one input and many outputs

a)

flip flop

b)

multiplexer

c)

demultiplexer

d)

counter

91.

A flip flop can store

a)

1 bit

b)

2 bits

c)

4 bits

d)

8 bits

92.
a)
A
b)
B
c)
C
d)
D
93.
(A+B)(A+C)=
a)
A+BC
b)
BC+BA
c)
ABCD
d)
AB+CD
94.
a)
A
b)
B
c)
C
d)
D
95.
Which truth table is this?
a)
XOR
b)
NAND
c)
NOR
d)
NOT
96.

What is a Flip-Flop?

a)

a 2 state device which offers basic memory for sequential logic operations, heavily used in banks called "registers"

b)

a logic device used to invert a value

c)

a storage device that works with non binary numbers

97.

A "universal" basic memory device used in banks called registers

a)

J-K Flip-Flop

b)

D-Type Flip-Flop

c)

S-R Flip-Flop

98.

A collection of flip-flops used to move data(bits) within a register is a _______.

a)

Shift Register

b)

Bit Register

c)

Flip Register

99.

What type of Flip-Flop is pictured here?

a)

J-K

b)

D

c)

S-R

d)

Toggle

100.

( A + B ) ( C + D )

is the same as

a)

AC + BD

b)

(A . B ) + ( C . D )

c)

A + B + C + D

d)

AC + AD + BC + BD

101.
Decoder is a
a)
combinational circuit
b)
sequential circuit
c)
complex circuit
d)
gate
102.

In a clocked SR latch the outputs of the latch change when:

a)

Clock is 0

b)

Clock is 1

c)

Does not depend on clock

d)

None of the above

103.

A D latch can have both Q and Q BAR the same

a)

True

b)

False

104.

A JK-FF has no Invalid State

a)

True

b)

False

105.

Sequential logic is _______?

a)

where the output is a function of only the present input.

b)

a fundamental building block of digital electronics.

c)

difficult to predict the output.

106.

How many probes would I need to represent a 2-Bit counter?

a)

2

b)

6

c)

1

d)

4

107.

This dependency is aided with a clock signal to _______ and ______ to retain previous outputs.

a)

open gate and light switch

b)

toggle and define

c)

flip and flop

d)

control sequencing and memory

108.

The output values of sequential logic depend ______________.

a)

when the switch is on.

b)

The output values depend not only on the current input values, but also on previous output values.

c)

on the amount of inputs.

d)

the value of the resistor.

109.

How many probes would I need to represent a 4-Bit counter?

a)

2

b)

6

c)

1

d)

4

110.

If you added a fifth bit, what would you guess is the highest number

you could count to? (engineering notebook)

4 lines
111.

Counters are one of the most common applications of flip-flops. Now create a simple binary counter using two D flip-flops. 

a)

Dual D Flip-Flop 

b)

J/K Flip-Flop

112.

The circuit that you will build is a two-bit binary counter. It will count from zero to three. What are these number values in binary?

a)

Zero is represented as 00 and two represented as 02 and three is represented as 11.

b)

Zero is represented as 00 and two represented as 01 and three is represented as 11.

c)

Zero is represented as 00 and two represented as 01 and three is represented as 101.

113.

Exit Ticket: The 2-Bit and 4-Bit counters you explored in this activity are referred to as “divide-by-two” counters. Explain the relationship between each consecutive flip-flop and the order in which they are laid out in the design from right to left that creates a binary count. (engineering notebook)

4 lines
114.
a)
b)
c)
d)
115.
a)
b)
c)
d)
116.
a)
b)
c)
d)
117.
a)
b)
c)
d)
118.
a)
b)
c)
d)
119.
a)
b)
c)
d)
120.
a)
b)
c)
d)
121.
a)
b)
c)
d)
122.
a)

Capacitors

b)

Resistors

c)

Inductors

d)

Batteries

123.
a)

Battery

b)

Capacitor

c)

Resistor

d)

Inductor

124.

What color should the top wire be?

a)

White

b)

Black

c)

Red

d)

Green

125.

According to the progression of digital design tools slide;

Which is these is the earliest design tool?

a)

Programmable Logic Devices

b)

Microcomputers Microcontrollers

c)

Integrated Chips

d)

Transistors

e)

Gates

126.

How do I get the circuit to do what I want it to do?

a)

Combinational Logic

b)

Sequential Logic

127.

How do I get the circuit to do what I want it to do, when I want it to happen?

a)

Combinational Logic

b)

Sequential Logic

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