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PLTW PRACTICE

Multiple Choice
Identify the letter of the choice that best completes the statement or answers the question.
 

 1. 

The truth table below is for a(n)
A
B
Y
0
0
1
0
1
0
1
0
0
1
1
0
a.
NAND gate
c.
XOR gate
b.
NOR gate
d.
OR gate
 

 2. 

An _______ gate is equivalent to an OR gate with an inverted output
a.
AND
c.
OR
b.
NOR
d.
NAND
 

 3. 

How many hexadecimal digits are needed to represent an 8 bit binary number?
a.
3
c.
1
b.
2
d.
4
 

 4. 

If the binary numbers 1001 and 0110 are added together the BCD    answer is
a.
01111
c.
0001   0101
b.
0101   0001
d.
1100   0111
 

 5. 

A NAND gate has an output of logic 1 when
a.
at least one input is logic 1
c.
both inputs are logic 1
b.
both a and b
d.
at least one input is logic 0
 

 6. 

The one’s complement of binary 1010 is
a.
0101
c.
1011
b.
1010+1
d.
1101
 

 7. 

An _______ gate is equivalent to an OR gate with an inverted output
a.
OR Gate
c.
NAND Gate
b.
NOR Gate
d.
AND Gate
 

 8. 

Digital electronics is based on which number system?
a.
decimal
c.
binary
b.
hexidecimal
d.
octal
 

 9. 

Fan-out is a term which refers to
a.
an indication of a high level output
c.
time delay
b.
a type of surface mount technology
d.
the number of loads that a device can drive
 

 10. 

In the circuit below, the output is 1 when
pltw_practice_files/i0110000.jpg
a.
one input is 1
c.
none of the above
b.
both inputs are 0
d.
both inputs are 1
 

 11. 

The logic family with excellent noise immunity is
a.
TTL
c.
DDL
b.
CMOS
d.
RDL
 

 12. 

Binary 11011 is equal to decimal
a.
15
c.
13
b.
27
d.
9
 

 13. 

The circuit below is equivalent to a(n)
pltw_practice_files/i0140000.jpg
a.
NAND Gate
c.
AND Gate
b.
NOR Gate
d.
OR Gate
 

 14. 

A group of bits is called a
a.
word
c.
numbering system
b.
inverter
d.
digital system
 

 15. 

The logic OR gate is equivalent to
a.
switches in series
c.
swtches in parallel
b.
series parallel combination
d.
none of the above
 

 16. 

An OR gate with inverters at all inputs and output performs what function?
a.
OR
c.
NOR
b.
AND
d.
NAND
 

 17. 

An AND gate with inverters at all of the inputs is equivalent to a(n)
a.
NAND
c.
OR
b.
NOR
d.
AND
 

 18. 

A NAND gate has an output of logic 1 when
a.
at least one input is  0
c.
at least one input is  1
b.
when all inputs are 1
d.
upon inversion
 

 19. 

The 2’s complement of binary 1100 is
a.
0101
c.
0100
b.
1101
d.
0011
 

 20. 

A 2 input exclusive OR gate compares two inputs and has a logic 1 output when
a.
both inputs are the same
c.
one input is logic 0
b.
one input is logic 1
d.
both inputs are different
 

 21. 

The truth table below is for a(n)
A
B
Y
0
0
0
0
1
1
1
0
1
1
1
1
a.
NAND gate
c.
NOR gate
b.
OR gate
d.
XOR gate
 

 22. 

A TTL gate with a high output would typically be about _________ volts.
a.
2.2
c.
3.6
b.
0.9
d.
0.2
 

 23. 

A 2 input OR gate has a logic zero output when;
a.
both inputs are high
c.
one input is low
b.
both inputs are low
d.
one input is high
 

 24. 

THIS WILL BE QUESTION NUMBER 81 ON TEST BANK OF QUESTIONS
a.
alchohol
c.
styrofoam
b.
water
d.
conductive foam
 

 25. 

The Octal number 23 corresponds to the binary number
a.
01100
c.
26
b.
A1
d.
10011
 

 26. 

Unwanted voltages induced in the connecting wires and the printed circuit board traces of a digital system that might possibly affect its operation are called
a.
flux
c.
junk
b.
noise
d.
clutter
 

 27. 

A digital BCD encoder converts a
a.
binary number to a BCD number
c.
binary number to a decimal number
b.
decimal number to a binary number
d.
a hexadecimal number to a binary number
 

 28. 

The major difference between digital and analog signals lie in the fact that:
a.
Analog signals can be only either high or low.
c.
Digital signals can vary between many values and analog cannot
b.
Digital signals can vary only between two values.
d.
Digital signal do not yet exist
 

 29. 

The truth table below is for a(n)
A
B
Y
0
0
1
0
1
1
1
0
1
1
1
0
a.
NOR gate
c.
OR gate
b.
NAND gate
d.
XOR gate
 

 30. 

In binary addition, 1101 + 1011 equals
a.
11000
c.
10000
b.
11010
d.
11001
 

 31. 

The symbol for an AND gate is
a.
pltw_practice_files/i0320000.jpg
c.
pltw_practice_files/i0320001.jpg
b.
pltw_practice_files/i0320002.jpg
d.
pltw_practice_files/i0320003.jpg
 

 32. 

If both inputs to a NAND gate are one, the output is;
a.
intermediate state
c.
logic zero
b.
ground
d.
logic one
 

 33. 

When the bits of a four bit binary word are all shifted simultaneously from a high order position to a lower order position the number is
a.
saved in its current form
c.
divided by 2
b.
changed to its ones complement
d.
multiplied by 2
 

 34. 

The circuit below is equal to
pltw_practice_files/i0350000.jpg
a.
pltw_practice_files/i0350001.jpg
c.
pltw_practice_files/i0350002.jpg
b.
pltw_practice_files/i0350003.jpg
d.
pltw_practice_files/i0350004.jpg
 

 35. 

A one carry results at the output of an adder when ____ are added together.
a.
00
c.
01
b.
10
d.
11
 



 
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