CIS018-1 Fundamentals of Computer Studies MATHEMATICS AND COMPUTER HARDWARE QUESTIONS AND ANSWERS - REVISION Question The decimal number +125 can be represented in signed binary as: Answer 01111101 10000010 11111001 None of the above Question The decimal number -36 is expressed in the 2’s complement form as: Answer 11011100 11011011 01011011 None of the above Question The inputs to a full-adder are A=1, B=1 and Cin=0. The outputs are Answer Sum=0, Cout=1 Sum=1, Cout=0 Sum=1, Cout=1 None of the above Question The sum of 1010+10111 equals Answer 110001 Page 1 of 55
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CIS018-1 Fundamentals of Computer Studies
MATHEMATICS AND COMPUTER HARDWARE QUESTIONS AND ANSWERS - REVISION
Question The decimal number +125 can be represented in signed binary as:Answer 01111101
10000010
11111001
None of the above
Question The decimal number -36 is expressed in the 2’s complement form as:Answer 11011100
11011011
01011011
None of the above
Question The inputs to a full-adder are A=1, B=1 and Cin=0. The outputs areAnswer Sum=0, Cout=1
Sum=1, Cout=0
Sum=1, Cout=1
None of the above
Question The sum of 1010+10111 equalsAnswer 110001
101101
111010
101111
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CIS018-1 Fundamentals of Computer Studies
Question The purpose of the clock input to a flip-flop is toAnswer cause the output to change state dependent on the inputs
clear the device
set the device
always cause the output to change states
Question For an edge-triggered D flip-flopAnswer a change in the state of the flip-flop can occur only at a clock pulse
edge
the state that the flip-flop goes to depends on the D input
the output follows the input at each clock pulse edge
all of these answers
Question The storage cell in a SRAM is a Answer flip-flop
fuse
capacitor
magnetic domain
Question The bit capacity of a memory that has 10 bit long address and can store 8 bits at each address is
Answer 8192
1024
18
80
Question How many bits are required in an address bus for a memory of 1024 bytes?
Answer 10
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CIS018-1 Fundamentals of Computer Studies
8
11
None of the other answers is correct
Question How many gates would it require to implement the Boolean formula
A(B+C) in the straightforward way (without transformations or
simplifications)?
Answer 4
5
3
6
Question A two-input AND gate has the following inputs
Which of the following is its output?
Answer
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CIS018-1 Fundamentals of Computer Studies
Question A two-input OR gate has the following inputs:
Which of the following is its output?
Answer
Question A two-input EX-OR gate has the following inputs:
Which of the following is its output?
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CIS018-1 Fundamentals of Computer Studies
Answer
Question For the circuit given below, what is B and C respectively?
Answer B=A and C=A
B=A and C=A
B=A and C=A
B=A and C=A
Question The benefit of the assembly language is that it is:Answer Fast and efficient
Can be used on any processor
Easier to write programs
None of the above
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Question The benefits of RISC design simplicity areAnswer Smaller chip and pin count
Smaller programs
Easy programming
All of the above
Question The states of the flags are stored in the ________Answer Status register
Working register
Instruction register
Flag register
Question The newer Microchip dsPIC is a ________ controller with digital signal processing capability
Answer 32 bits
16 bits
8 bits
Question What is the size of the data bus in a PIC16F684?Answer 4
8
12
16
Question The difference of 101-011 equalsAnswer 010
100
101
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011
Question The Boolean expression A.1 is equal toAnswer A
0
1
None of the above
Question The following Boolean identity is correct? A + 1 = 1
Answer True
False
Question The Boolean expression A + 1 is equal toAnswer A
0
1
None of the above
Question Which of the following expressions is equivalent to A(A + B)?Answer A + B
0
1
None of the above
Question The Boolean expression BC + ABC is equivalent to Answer BC
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ABC
BC
None of the other answers is correct
Question What is one disadvantage of an R-S flip flop?Answer It has only a single output
It has no CLOCK input
It has no Enable input
It has an invalid input state
Question When both inputs of a J-K pulse-triggered FF are high, and the clock cycles, the output will _________
Answer be invalid
toggle
not change
remain unchanged
Question The function ABCD can be decoded with ______Answer Two 2-input OR gates and two inverters
Two 2-input OR gates and one inverter
One 4-input AND gate and one inverter
One 4-input AND gate
Question The relationship between a NOR gate and an AND gate is expressed by ________
Answer AB = A + B
A + B = A B
AB = A + B
None of the above
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Question The commutative law of Boolean algebra states that A + B = A BAnswer True
False
Question The output of a NOR gate is HIGH only when all inputs are HIGHAnswer True
False
Question The output of a NAND gate is LOW only when all inputs are HIGHAnswer True
False
Question Any Boolean Expression can be implemented using only NAND gatesAnswer True
False
Question It is possible to implement any Boolean expression using only OR gates
Answer True
False
Question 1’s complement of a binary number is obtained by adding 1 to its 2’s complement
Answer True
False
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Question The output of an OR gate is LOW only when at least one input is LOW
Answer True
False
Question When referring to instructions words, a mnemonic is:Answer A short abbreviation for the operand address
Shorthand for machine language
A short abbreviation for the operation to be performed
A short abbreviation for the data word stored at the operand address
Question What is the difference between a microcontroller and microprocessor?
Answer A microcontroller does not have a CPU whereas a microprocessor has a CPU
A microcontroller has no memory whereas a microprocessor has memory
A microcontroller contains the CPU, memory and I/O in a single chip whereas in a microprocessor the components may be in different chips
None of the above
Question What is TRISA in the PIC?Answer input port
output port
memory
data direction register
Question What is the primary function of a register?Answer counting
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encoding
data storage (memory)
decoding
Question The application of DeMorgan’s theorems will reduce the expression X
= (A + B + C) + (A + B + C) + (AB + C) to which sum-of-products
expression?
Answer X = (A + B + C) + ABC + ABC
X = (A + B + C) + (ABC) + (ABC)
X = ABC + ABC + AC + BC
X = ABC + ABC + ABC
Question The output of an OR gate with inputs A, B, and C is a 1 whenAnswer A=1, B=1, C=1
A=0, B=0, C=1
A=1, B=0, C=1
All of them
None of them
Question The Karnaugh map below represents the expression, X = ACD + AB(CD + BC)
C D C D C D C D
A B 0 0 0 0
A B 0 0 1 1
A B 0 0 0 1
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A B 0 0 0 1
Answer True
False
Question Which of the following SoPs corresponds to the Karnaugh map below?
BC BC BC BC
A\BC 00 01 11 10
A 0 1 1 1 1
A 1 1 0 0 1
Answer A + C
AC
C + AC
B + C
Question Which of the following SoPs corresponds to the Karnaugh map below?
B B
A\B 0 1
A 0 1 1
A 1 0 0
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Answer A
A
B
B
Question How many gates would it require to implement Boolean formula
A (B + C) in the straightforward way (without transformations or
simplifications)?
Answer 5
4
3
6
Question The output of an AND gate with inputs A, B, and C is a 1 whenAnswer A=1, B=1, C=1
A=1, B=0, C=1
A=0, B=1, C=0
All are correct
Question Which of the following is equivalent to (A + B)C?
AnswerAC + BC
None of the other answers is correct
AB + C
AB + C
Question Given the circuit below, what is the minimum number of gates you
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CIS018-1 Fundamentals of Computer Studies
can use to implement this function? (Assume 2, 3 and 4-input gates are available)
Answer 2
3
1
4
Question Which of the following is equivalent to A(BC + AB + AC)?
AnswerBC
A + BC
A . B + C
None of the other answers is correct
Question Which of the following expressions is represented by the following Karnaugh map?
C C
A B 1 0
A B 0 1
A B 0 1
A B 1 0
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AnswerAC + AC
BC + BC
B + B
AC + AC + BC + BC
Question Which of the following SoPs corresponds to the Karnaugh map below?
B B
A\B 0 1
A 0 1 1
A 1 0 1
AnswerA + B
AB
A + AB
AB + B
Question Which of the following expressions is equivalent to A.A.B?Answer A.B
A
1
None
Question The binary number 11012 is equal to the decimal numberAnswer 13
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49
11
3
Question When performing binary addition using the 2’s complement method, an overflow is indicated by a (n) _________
Answer Negative sign
Incorrect sign bit
Incorrect polarity
Incorrect sum
Question Given the circuit below, what is the minimum number of gates you can use to implement this function? (Assume 2, 3 and 4-input gates are available)
Answer 2
3
1
4
Question The number of values that can be assigned to a bit areAnswer 2
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1
10
0
Question What is the base (radix) for octal numbers?Answer 8
16
7
6
Question The output of an AND gate is LOW only when all inputs are LOWAnswer True
False
Question What is the BCD form of 438?Answer 1010000111000
010000111000
000110110110
0100000110100
Question The highest decimal value that can be represented by a 4-bit binary number is ____________
Answer 32
8
7
15
Question Which of the following expressions is equivalent to (A + B) + A?
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Answer A + B
0
A
None
Question Which of the following expressions is equivalent to A.B + A?Answer A
B
1
None
Question Which of the following expressions is equivalent to A.C.B.D + A?Answer A + B + C + D
A.B.C.D
A
None
Question Which of the following is equivalent to (A + C)(B + C)(B + D)(A + D)?Answer AD + BC
A + B + C +D
AB + CD
ABC + BCD + ACD + ABD
Question For an OR gate, if any of the input is high (1), output is high (1)Answer True
False
Question Which of the following is the hexadecimal representation of binary number 1101001101?
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Answer D31
34D
C4D
D34
Question Addition in Boolean Algebra is not equivalent to OR function.Answer True
False
Question Which of the following is the binary representation of decimal number 151?
Answer 10110001
0151
11011
10010111
Question What is the hex equivalent of the binary number 101010112
Answer 8516
E816
AB16
9B16
Question Which of the following binary numbers is equal to 010100102 + 001100012?
Answer 011100112
100000112
000000112
100000012
Question Which of the following binary numbers is equal to 11112 + 11112?
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Answer 111102
None of the answers is correct
100002
11112
Question Which of the following is the decimal representation of hexadecimal number 12316?
Answer 80110
29110
12310
413110
Question Which of the following is the number that is represented by 11101001 in 8-bit 2’s complement form?
Answer 233
-9
9
-23
Question Convert the decimal integer 27 to binaryAnswer 11011
101111
10110
None of the other answers is correct
Question What is the decimal equivalent of the binary integer 1101?Answer 13
12
9
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15
Question Convert the binary integer 1110001 to its hexadecimal equivalentAnswer E1H
F2H
71H
None of the other answers is correct
Question Convert the binary integer 1010010 to its octal equivalentAnswer 1228
828
978
5108
Question Convert the decimal number 463 into its BCD formAnswer 010001100011
000111001111
001001100010
000111001110
Question Which of the following is full-form of ALU?Answer Arithmetic and Logic Unit
Arithmetic Last Unit
Anti-Logic Unit
Arbitration Logic Unit
Question In computing, what does MSB stand for?Answer Most Significant Bit
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Most Significant Byte
Most Simple Byte
Most Structured Byte
Question How many cells are there in a 3-variable Karnaugh map?Answer 8
6
4
3
Question What is the decimal equivalent of the largest 8-bit binary integer?Answer 256
512
255
511
Question Which of the following are referred to as ‘Universal Gates’?Answer NAND and NOR
AND, OR and NOT
XOR and XNOR
None of the other answers is correct
Question Which of the following is the correct truth table of a NOR gate?
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Answer
Question A general computer requires:Answer CPU, Memory and I/O units
Control Unit, CPU, Memory and I/O units
ALU, CPU and Memory
None of the other answers is correct
Question What is the sum of 10012 + 10102?
Answer 100002
111102
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None of the other answers is correct
111112
Question Which of the following is the 2’s complement of 0000 (4-bit representation is assumed)?
Answer 0000
1110
0001
1101
Question What are the three basic logic operators?Answer AND, OR and NOT
AND, OR and NAND
NAND, NOR and XOR
XOR, XNOR and NOT
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Question Which logic operation can you relate to the following operations?
i. The light is ON if SW1 is closedii. The light is ON if SW2 is closediii. The light is OFF if both SW1 and SW2 are openiv. The light is ON if both SW1 and SW2 are closed
Answer AND operation
OR operation
XOR operation
NAND operation
Question A logic circuit requires HIGH on all its inputs to make the output HIGH. Which logic operation does this represent?
Answer AND
OR
XOR
NOT
Question Consider an 8-bit register that has been RESET. If you transfer 0101 serially into the register, beginning with a 1 and shifting to the right, what will the total content of the register be as soon as the fourth bit is stored.?
Answer A0H
50H
05H
0AH
Question Which of the following is equivalent to hexadecimal integer A1416 in binary?
Answer 101000010100
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010110100
11011111
None if the other answers is correct
Question Convert -27 to binary using 2’s complement representation. Answer 01100101
00011011
11100101
10011011
Question Which of the following is the decimal representation of binary number 1000101?
Answer 69
1000101.0
81
37
Question Which of the following is the binary representation of decimal number 101110?
Answer 10112
101110
1111110011
111110011
Question What is the binary equivalent of 4F16?
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Answer 10011112
10011002
100011112
None
Question The decimal number -36 is expressed in the 2’s complement form asAnswer 11011100
11011011
01011011
None of the above
Question In the 2’s complement form, the binary number 10010011 is equal to the decimal number
Answer -109
+109
-19
+19
Question Which of the following is the hexadecimal representation of decimal number 7522?
Answer 26131
11362
1D62
26D1
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Question What is the value of the sum 225 + 345?Answer 445
1215
1115
1005
Question Which of the following expressions is equivalent to A.A.B + B?Answer A
B
1
None
Question An OR gate has an output that is opposite of an NOR gateAnswer True
False
Question Which of the following expressions is equivalent to A.(A + B) + A?Answer A + B
0
A
None
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Question Which of the following expressions is represented by the following Karnaugh map?
C C
A B 1 0
A B 0 1
A B 0 1
A B 0 0
Answer AC + AC
BC + C
ABC + BC
BC + BC
Question Which of the following 4 bits must appear in the lower row of the Karnaugh map to correspond to the truth table below?
A B C Function0 0 0 10 0 1 10 1 0 10 1 1 11 0 0 01 0 1 11 1 0 01 1 1 1
BC BC BC BC
A\BC 00 01 11 10
A 0 1 1 1
A 1
Answer 0 0 1 1
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0 1 1 0
1 1 0 1
1 0 1 0
Question Which formula describes the circuit shown below?
Answer (A + B)CD
C(A + B) + D
AB + C + D
ABCD
Question The following is the truth table for which gate?
A B X0 0 00 1 11 0 11 1 1
Answer OR gate
AND gate
NAND gate
NOR gate
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Question A gate that gives 0 (low) when both its inputs are 1 (high) is a _________ gate.
Answer
Question Select the correct statement from the followingAnswer Flash memory uses a flashing beam of light to store data
Dynamic RAMs must be periodically refreshed to retain data
RAM is Random Address Memory
Optical storage devices employ ultraviolet light
Question How many bits are there in a byteAnswer 8
6
10
2
Question A byte-organised memory hasAnswer 8 data output lines
16 output data lines
1 data output line
None of the above
Question RAM isAnswer Volatile memory
Random address memory
Stored data is not lost if power is removed
All answers are correct
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CIS018-1 Fundamentals of Computer Studies
Question What is the binary equivalent of 178?Answer 1011112
11112
100012
None of the above
Question Find the output of an 8- bit AND gate for the following binary inputs
A=01011100B=11110101
Answer 1010100
Question Find the output of an 8-bit OR gate for the following binary inputs
A=01011100B=11110101
Answer 11111101
Question A circle, or “bubble”, on a distinctive-shape logic symbol indicates a logic inversion
Answer True
False
Question In binary multiplication, 1 x 1 = __________Answer 0 with a carry of 1
1 with a carry of 1
1
0
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Question The Boolean expression for the symbol in the figure below is _______
Answer X = (A + B)(B + C)
X = A + B + C + D
X = AB + BC
X = ABCD
Question The symbol shown in the figure below is a(n) ________ gate
Answer Exclusive-OR
AND
Exclusive-NOR
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OR
Question Which circuit in the figure below represents the NAND implementation of a NOR function?
Answer Figure A
Figure B
Figure C
Figure D
Question Occasionally, a particular logic expression will be of no consequence in the operation of a circuit such as in a BCD-to-decimal converter. These result in _____________ terms in the Karnaugh map and can be treated as either ___________ or __________
Answer Don’t care, 1s, 0s
Duplicate, 1s, 0s
Spurious, ANDs, ORs
Spurious, 1s, 0s
Question How many gates, including inverters, are required to implement the
equation, X = A + AB + AB, after it is simplified using Boolean
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algebra?
Answer 1
2
3
4
Question Which single multi-input gate can be used to implement the Boolean
formula A . B . C?
Answer NOR
AND
NAND
OR
Question Which single (only one) multi-input gate can be used to implement
the Boolean formula A . B . C?
Answer a 3-input NOR gate
a 3-input NAND gate
a 3-input XOR gate
a 3-input OR gate
Question Which circuit in the figure below represents the NAND implementation of an AND gate?
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Answer Figure A
Figure B
Figure C
Figure D
Question In using the 2’s-complement system of subtraction, a negative number in the subtrahend would ultimately be changed to:
Answer A negative number in true binary form
A positive number in true binary form
Question Which of the following lists memory devices from the most complex and expensive, to the least complex and expensive?
Answer Flash, EPROM, EEPROM, PROM
PROM, Flash, EEPROM, EPROM
EEPROM, Flash, EPROM, PROM
EEPROM, PROM, Flash, EPROM
Question For the network shown below, the Boolean expression for X is ________
Answer (AC + BC)D
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((A + B).C) + D
A + BC + D
D(A + B + C)
Question An assembler is used to ________Answer Convert assembly language to machine code
Convert the assembly language from one processor to the assembly language for another processor
Convert a high-level language to assembly language
Write and edit assembly language programs
Question An advantage of assembly language programs is _________Answer They typically run faster than programs written in a higher level
language
They can use the same compiler tools as high-level languages
They can run on any processor
They are well suited for large and complex applications
Question A complier ________Answer Allows machine code for one processor to run on another processor
Converts machine code into assembly language
Converts assembly language into a high-level language
Converts a high-level language to machine code
Question How many I/O ports are in the PIC (16F684)?
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Answer 1
2
3
4
Question You are given a task to write a program for PIC 16F684 in assembly language to light-up some of the LEDs. Which port will you need to use in the program?
Answer Port A
Port B
Question In a microcontroller, which of the following registers is used for temporarily storing the operands/result of an ALU operation?
Answer Working register
Instruction register
Program counter
I/O register
Question Match the following names of circuits or gates with the operations they perform
Answer OR (Boolean sum) gate Finds the maximum of two input bits
Half-Adder Finds the sum of two input bits
Full-Adder Finds the sum of three input bits
Parallel Adder Finds the sum of two n-bit input numbers
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Question How many instructions are there in a PIC?Answer 35
74
108
None of the above
Question The Control Unit decodes the instruction and generates control signals for registers
Answer True
False
Question The assembler encounters the following instruction in the PIC16F684 program
MOVF R, W
What action would the assembler take?Answer Contents of register W are moved to R
Contents of register R are moved to W
Contents of register F are moved to R
Contents of register F are moved to W
Question Which register is used to address program memory?Answer Status register
Instruction register
Working register
Program counter
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Question In a processor, the address of the next instruction to be executed by the CPU is stored in the
Answer Stack pointer
Instruction register
Working register
Program counter
Question Which of the following bus(es) connect a CPU to its memoryAnswer Address bus
Data bus
Control (Read/Write) bus
All of the mentioned buses
Question Which register is a dedicated temporary storage register that simply stores the current instructions to be executed?
Answer Status register
Instruction register
I/O register
Working register
Question How many bits are required to program the PORTA/PORTC in the Op-code?
Answer 24
18
12
6
Question Before writing down assembly language instructions for the PIC, you need to give some instructions to the assembler. These instructions are referred to as
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Answer the BIOS
Executable instructions
System programs
Assembler directives
Question Information given to an assembler such as where to begin executing instructions is provided by
Answer the BIOS
Executable instructions
System programs
Assembler directives
Question Select one of the basic functional blocks of a microcomputer: Answer ALU
Microprocessor
Hard drive
None of the above
Question PIC16F684 has memory divided into blocks. What are the two memory blocks called?
Answer Program and instruction memory
Data and program memory
Instructions and data memory
Program and Flash memory
Question The 1’s complement of 10111001 isAnswer 01000110
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01000111
11000110
10111001
Question The 2’s complement of 11001000 isAnswer -109
+109
-19
+19
Question Select the correct statement from the following:Answer The 2’s complement of the binary number 0001 is 1111
The 1’s complement of the binary number 0101 is 1011
BCD stands for Binary Code for Digital
LSB stands for Lowest Single Bit
Question Choose a correct statement from the followingAnswer The decimal number system is a weighted system with ten digits
LSB stand for lowest single bit
In binary, 1 + 1 = 2
The right-most bit in a signed binary number is the sign bit
Question In the 2’s complement form, the binary number 01110101 is equal to:Answer +117
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-117
+10
-10
Question In the 2’s complement form, the binary number 10010011 is equal to the decimal number
Answer -109
+109
-19
+19
Question A 4-bit parallel adder can addAnswer Two 4-bit binary numbers
Two 2-bit binary numbers
Four bits at a time
Four bits in a sequence
Question Select the correct statement from the following:Answer When the two input bits are both 1 and the carry bit is a 1, the sum
output of a full adder is 1
A full adder adds three bits and produces two outputs
Both statements are correct
Both statements are false
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Question Select the correct statement from below:Answer A half-adder adds two binary bits
A half-adder has a sum output only
Two 4-bit numbers can be added using two full-adders
All are incorrect statements
Question Select the correct statement from below:Answer A data byte consists of eight bits
A memory cell can store a byte of data
The read operation always erases the data byte
ROM is a Random Output memory
Question A half-adder is characterised by:Answer Two inputs and two outputs
Three inputs and two outputs
Two inputs and one output
None of the above
Question Data is stored in RAM during theAnswer Write operation
Read operation
Enable operation
Addressing operation
Question For a gated D latch, the Q output always equals the D input
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Answer During the enable pulse
Before the enable pulse
When D = 1
When D = 0
Question For an edge-triggered D flip-flopAnswer a change in the state of the flip-flop can occur only at a clock pulse
edge
the state that the flip-flop goes to depends on the D input
the output follows the input at each clock pulse edge
all of these answers
Question If a S-R latch has a 1 on the S input and a 0 on the R input and hen the S input goes to 0, the latch will be
Answer Set
Reset
Clear
Invalid
Question Select the correct statement from below:Answer A data byte consists of 8 bits
A memory cell can store a byte of data
The read operation always erases the data byte
ROM is a Random Output Memory
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Question DRAM must beAnswer Refreshed periodically
Programmed before each use
Always enabled
Replaced periodically
Question A memory with 256 addresses hasAnswer 256 address lines
8 address lines
6 address lines
9 address lines
Question Select the correct statement from followingAnswer A latch has two stable states
A latch is considered to be in SET state when the Q output is LOW
An edge triggered D flip-flop changes state whenever the D input changes