4320 + Mcqs in Computer Science Page 13 McqOptions

601.	De Morgan's first theorem says that a NOR gate is equivalent to a bubbled _____ gate.
A.	AND
B.	XAND
C.	XOR
D.	NOR
E.	None of the above
Answer» B. XAND

Discussion

602.	How many bits are required to encode all twenty six letters ten symbols, and ten numerals?
A.	5
B.	6
C.	2
D.	3
E.	None of the above
Answer» C. 2

Discussion

603.	A combinational logic circuit which is used when it is desired to send data from two or more source through a single transmission line is known as
A.	encoder
B.	decoder
C.	multiplexer
D.	demultiplexer
E.	None of the above
Answer» D. demultiplexer

Discussion

604.	_____dominates the LSI field, and _____ is used extensively where lowest power consumption is necessary.
A.	NMOS, PMOS
B.	PMOS, CMOS
C.	NMOS, CMOS
D.	MOSFET, PMOS
E.	None of the above
Answer» D. MOSFET, PMOS

Discussion

605.	Digital design often starts by constructing a _____ table.
A.	Standard
B.	Two-stage
C.	Truth
D.	Two-dinensional
E.	None of the above
Answer» D. Two-dinensional

Discussion

606.	The time required for a pulse to decrease from 90 to 10 percent of its maximum value is known as
A.	rise time
B.	decay time
C.	binary level transition period
D.	propagation delay
E.	None of the above
Answer» C. binary level transition period

Discussion

607.	The hexadecimal digits are 0 to 9 and A to _____
A.	E
B.	F
C.	G
D.	D
E.	None of the above
Answer» C. G

Discussion

608.	The ASCII
A.	is a subset of 8-bit EBCDIC
B.	is used only in Western Countries
C.	is version II of the ASC Standard
D.	has 128 characters, including 32 control characters
E.	None of the above
Answer» E. None of the above

Discussion

609.	A diagram that illustrates the ore (Logic) of functions in a progran called a
A.	Flowchart
B.	Sequence of steps
C.	Direction of flow
D.	All of the above
E.	None of the above
Answer» B. Sequence of steps

Discussion

610.	Flip-flop outputs are always
A.	complimentary
B.	the same
C.	independent of each other
D.	same as inputs
E.	None of the above
Answer» B. the same

Discussion

611.	With an RS latch a high S and low R sets the output to _____ ; a low S and a high R _____ the output to low.
A.	No change, set
B.	Race, high
C.	high, reset
D.	set, reset
E.	None of the above
Answer» D. set, reset

Discussion

612.	A _____ TTL device can sink up to 16mA and can source up to 400 MA.
A.	Low-power
B.	high-power
C.	Standard
D.	Schottky
E.	None of the above
Answer» D. Schottky

Discussion

613.	The output 0 and 1 levels for TTL logic family is approximately
A.	0.1 and 5 V
B.	0.6 and 3.5 V
C.	0.9 and 1.75V
D.	-1.75 and -0.9 V
E.	None of the above
Answer» C. 0.9 and 1.75V

Discussion

614.	What is the 2's complement of 0011 0101 1001 1100 number?
A.	1100 1010 1100 1011
B.	1100 1010 0110 0011
C.	1100 1010 0110 0100
D.	1100 1010 1111 1111
E.	None of the above
Answer» D. 1100 1010 1111 1111

Discussion

615.	A p- channel enhancement type MOSFET performs much the same function as a PNP transistor, except that
A.	it operates much faster
B.	it is considerably larger
C.	it is controlled by voltage rather than by current, so that it requires very little current at the control terminal
D.	it is controlled by current rather than by voltage like a bipolar transistor.
E.	None of the above
Answer» D. it is controlled by current rather than by voltage like a bipolar transistor.

Discussion

616.	De Morgan's second therm says that NAND gate is equivalent to a bubbled _____ gate.
A.	AND
B.	XAND
C.	XOR
D.	OR
E.	None of the above
Answer» E. None of the above

Discussion

617.	What logic function is produced by adding an inverter to each input and the output of an AND gate?
A.	NAND
B.	NOR
C.	OR
D.	XOR
E.	None of the above
Answer» D. XOR

Discussion

618.	When a transistor is cut off or saturated, transistor _____ have almost no effect
A.	wave
B.	variations
C.	stage
D.	circuits
E.	None of the above
Answer» C. stage

Discussion

619.	Express -7 as 16-bit signed binary numbers.
A.	0000 0000 0000 0111
B.	1000 0000 0000 0111
C.	. 0111 0000 0000 0001
D.	0111 0000 0000 0000
E.	None of the above
Answer» C. . 0111 0000 0000 0001

Discussion

620.	The inverter OR gate and AND gate are called decision-making elements because they can recognize some input _____ while disregarding others. A gate recognizes a word when its output is _____
A.	words, high
B.	bytes, low
C.	bytes, high
D.	character, low
E.	None of the above
Answer» B. bytes, low

Discussion

621.	A positive AND gate is also a negative
A.	NAND gate
B.	NOR gate
C.	AND gate
D.	OR gate
E.	None of the above
Answer» E. None of the above

Discussion

622.	In which code the successive code characters differ in only one bit position?
A.	gray code
B.	excess 3 code
C.	8421 code
D.	algebraic code
E.	None of the above
Answer» B. excess 3 code

Discussion

623.	ASCII and EBCDIC differ in
A.	their efficiency in storing data
B.	the random and sequential access method
C.	the number of bytes used to store characters
D.	their collecting sequences
E.	None of the above
Answer» E. None of the above

Discussion

624.	Which logic family dissipates the minimum power?
A.	DTL
B.	TTL
C.	ECL
D.	CMOS
E.	None of the above
Answer» E. None of the above

Discussion

625.	Address 200H contains the byte 3FH. What is the decimal equivalent of 3FH
A.	63
B.	32
C.	16
D.	38
E.	None of the above
Answer» B. 32

Discussion

626.	An OR gate can be imagined as
A.	switches connected in series
B.	switches connected in parallel
C.	MOS transistors connected in series
D.	All of the above
E.	None of the above
Answer» C. MOS transistors connected in series

Discussion

627.	The functional difference between SR flip-flop and JK flip-flop is that
A.	JK flip-flop is faster than SR flip-flop
B.	JK flip-flop has a feed back path
C.	JK flip-flop accepts both inputs 1
D.	JK flip-flop does not require external clock
E.	None of the above
Answer» D. JK flip-flop does not require external clock

Discussion

628.	Evaluate the following expression: 7 >=3 + 4 \|\| 6<4 && 2<5
A.	True
B.	False
Answer» B. False

Discussion

629.	When a language has the capability to produce new data types, it is said to be
A.	reprehensible
B.	encapsulated
C.	overloaded
D.	extensible
Answer» E.

Discussion

630.	Which of the following statements uses the computer's clock to initialize the random number generator?
A.	srand(time);
B.	srand(time(NULL));
C.	time(srand);
D.	time(srand(NULL));
Answer» C. time(srand);

Discussion

631.	The items listed in the function header are called _____
A.	actual arguments
B.	formal parameters
C.	passed parameters
D.	sent arguments
Answer» C. passed parameters

Discussion

632.	A translator that notes whether you have used a language correctly may be called a _____
A.	theasurus
B.	compiler
C.	coder
D.	decoder
Answer» C. coder

Discussion

633.	Which of the following can be used to declare the main function?
A.	void main
B.	void Main()
C.	void main()
D.	main
E.	either (b) or (c) can be used
Answer» D. main

Discussion

634.	You _____ write your own container classes
A.	must
B.	may
C.	should not
D.	must not
Answer» C. should not

Discussion

635.	If an integer object is thrown with a throw statement, then a subsequent catch block has a usable match if the type of the catch argument is
A.	int
B.	double
C.	either (a) or (b)
D.	neither (a) nor (b)
Answer» B. double

Discussion

636.	The highest level of cohesion is
A.	functional cohesion
B.	temporal cohesion
C.	logical cohesion
D.	sequential cohesion
Answer» B. temporal cohesion

Discussion

637.	The base class for most stream classes is the _____ class
A.	ios
B.	out
C.	in
D.	app
Answer» B. out

Discussion

638.	Errors in a program are called
A.	accidents
B.	annoyances
C.	bugs
D.	mistakes
E.	typing errors
Answer» D. mistakes

Discussion

639.	The most efficient data type for a variable that stores the number 4.6e20 is the _____ data type
A.	Character
B.	Double
C.	Float
D.	Long Integer
E.	Short Integer
Answer» D. Long Integer

Discussion

640.	The preprocessor directive always starts with the symbol
A.	%
B.	&
C.	#
D.	""
E.	None of the above
Answer» D. ""

Discussion

641.	In a class specifier, data or functions designated private are accessible
A.	to any function in the program
B.	only if you know the password
C.	to member functions of that class
D.	only to public members of the class
Answer» D. only to public members of the class

Discussion

642.	Which of the following is the inequality operator?
A.	!=
B.	=
C.	==
D.	-->
E.	<>
Answer» B. =

Discussion

643.	When a function includes a throw statement for errors, the call to the potentially offending function should be placed within a _____ block
A.	throw
B.	try
C.	catch
D.	scope
Answer» C. catch

Discussion

644.	The scope resolution operator is
A.	a comma
B.	a semicolon
C.	a colon
D.	two colons
Answer» E.

Discussion

645.	If a derived class uses the public access specifier, then _____
A.	public base class members remain public in the derived class
B.	protected base class members become public in the derived class
C.	both (a) and (b)
D.	neither (a) nor (b)
Answer» B. protected base class members become public in the derived class

Discussion

646.	The operator that releases previously allocated memory is _____
A.	release
B.	return
C.	delete
D.	destroy
Answer» D. destroy

Discussion

647.	You must provide a constructor for a derived class
A.	always
B.	if the base class constructor required arguments
C.	if the base class constructor does not required arguments
D.	never
Answer» C. if the base class constructor does not required arguments

Discussion

648.	"C++" is a _____ constant
A.	character literal
B.	named literal
C.	numeric literal
D.	string literal
Answer» E.

Discussion

649.	In a C++ program, which of the following can be thrown?
A.	scalar variables
B.	programmer-defined objects
C.	both (a) and (b)
D.	neither (a) nor (b)
Answer» C. both (a) and (b)

Discussion

650.	A function in a derived class that has the same name as a function in the parent class
A.	will override the base class function
B.	will cause an error message to display
C.	will be overridden by the base class function
D.	will execute immediately often the base class function executes
Answer» B. will cause an error message to display

Discussion

Explore topic-wise MCQs in Engineering.

De Morgan's first theorem says that a NOR gate is equivalent to a bubbled _____ gate.

How many bits are required to encode all twenty six letters ten symbols, and ten numerals?

A combinational logic circuit which is used when it is desired to send data from two or more source through a single transmission line is known as

_____dominates the LSI field, and _____ is used extensively where lowest power consumption is necessary.

Digital design often starts by constructing a _____ table.

The time required for a pulse to decrease from 90 to 10 percent of its maximum value is known as

The hexadecimal digits are 0 to 9 and A to _____

The ASCII

A diagram that illustrates the ore (Logic) of functions in a progran called a

Flip-flop outputs are always

With an RS latch a high S and low R sets the output to _____ ; a low S and a high R _____ the output to low.

A _____ TTL device can sink up to 16mA and can source up to 400 MA.

The output 0 and 1 levels for TTL logic family is approximately

What is the 2's complement of 0011 0101 1001 1100 number?

A p- channel enhancement type MOSFET performs much the same function as a PNP transistor, except that

De Morgan's second therm says that NAND gate is equivalent to a bubbled _____ gate.

What logic function is produced by adding an inverter to each input and the output of an AND gate?

When a transistor is cut off or saturated, transistor _____ have almost no effect

Express -7 as 16-bit signed binary numbers.

The inverter OR gate and AND gate are called decision-making elements because they can recognize some input _____ while disregarding others. A gate recognizes a word when its output is _____

A positive AND gate is also a negative

In which code the successive code characters differ in only one bit position?

ASCII and EBCDIC differ in

Which logic family dissipates the minimum power?

Address 200H contains the byte 3FH. What is the decimal equivalent of 3FH

An OR gate can be imagined as

The functional difference between SR flip-flop and JK flip-flop is that

Evaluate the following expression: 7 &gt;=3 + 4 || 6&lt;4 &amp;&amp; 2&lt;5

When a language has the capability to produce new data types, it is said to be

Which of the following statements uses the computer's clock to initialize the random number generator?

The items listed in the function header are called _____

A translator that notes whether you have used a language correctly may be called a _____

Which of the following can be used to declare the main function?

You _____ write your own container classes

If an integer object is thrown with a throw statement, then a subsequent catch block has a usable match if the type of the catch argument is

The highest level of cohesion is

The base class for most stream classes is the _____ class

Errors in a program are called

The most efficient data type for a variable that stores the number 4.6e20 is the _____ data type

The preprocessor directive always starts with the symbol

In a class specifier, data or functions designated private are accessible

Which of the following is the inequality operator?

When a function includes a throw statement for errors, the call to the potentially offending function should be placed within a _____ block

The scope resolution operator is

If a derived class uses the public access specifier, then _____

The operator that releases previously allocated memory is _____

You must provide a constructor for a derived class

"C++" is a _____ constant

In a C++ program, which of the following can be thrown?

A function in a derived class that has the same name as a function in the parent class

_dominates the LSI field, and _ is used extensively where lowest power consumption is necessary.

With an RS latch a high S and low R sets the output to _ ; a low S and a high R _ the output to low.

The inverter OR gate and AND gate are called decision-making elements because they can recognize some input _ while disregarding others. A gate recognizes a word when its output is _

Evaluate the following expression: 7 >=3 + 4 || 6<4 && 2<5