4320 + Mcqs in Computer Science Page 83 McqOptions

4101.	Which one of the following statements is true for voltage in a series circuit?
A.	The total voltage is equal to the sum of the individual voltages in a series circuit
B.	The total voltage in a series circuit is equal to the average value of the individual voltages
C.	The total voltage of a series circuit is equal to the total current divided by the total resistance
D.	The total voltage in a series circuit is always less than the value of the smallest voltage
E.	None of the above
Answer» B. The total voltage in a series circuit is equal to the average value of the individual voltages

Discussion

4102.	A basic capacitor is composed of:
A.	two conductors separated by a dielectric
B.	two dielectrics separated by a conductor
C.	two coils separated by a dielectric
D.	two coils separated by a conductor
E.	None of the above
Answer» B. two dielectrics separated by a conductor

Discussion

4103.	Which one of the following devices is most often used for measuring electrical potential difference?
A.	Voltmeter
B.	Ohmmeter
C.	Ammeter
D.	Wattmeter
E.	None of the above
Answer» B. Ohmmeter

Discussion

4104.	The graph of current gain versus collector current indicates that the current gain
A.	varies enormously
B.	is contant
C.	varies slightly
D.	equals the collector current divided by the base current
E.	None of the above
Answer» E. None of the above

Discussion

4105.	A device that converts mechanical pressure to electrical energy is called a:
A.	piezoelectric device
B.	solar cell
C.	photodiode
D.	nicad cell
E.	None of the above
Answer» B. solar cell

Discussion

4106.	Which one of the following statements is true for the voltage in a parallel RC circuit?
A.	The voltage always has the same amplitude and phase for every part of the circuit
B.	The total voltage is equal to the sum of the voltages across the resistance and capacitance
C.	The total voltage leads the total current by less than 90 degree
D.	The total voltage is less than the sum of the voltages across the resistance and capacitance
E.	None of the above
Answer» B. The total voltage is equal to the sum of the voltages across the resistance and capacitance

Discussion

4107.	The Thevenin resistance is equal in value to the
A.	Load resistance
B.	Half the load resistance
C.	Internal resistance of a Morton circuit
D.	Open-load resistance
E.	None of the above
Answer» B. Half the load resistance

Discussion

4108.	Most AC power is obtained from:
A.	generators
B.	batteries
C.	oscillators
D.	lightning
E.	None of the above
Answer» D. lightning

Discussion

4109.	Which one of the following statements is true for the currents in a parallel RL circuit?
A.	The total current is equal to the sum of the currents through the resistance and inductance
B.	The current always has the same amplitude and phase for every part of the circuit
C.	The total current is less than the sum of the currents through the resistance and inductance
D.	The total current leads the total voltage by less than 90
E.	None of the above
Answer» D. The total current leads the total voltage by less than 90

Discussion

4110.	When the Q point moves along the load line, the voltage increases when the current
A.	Decreases
B.	Stays the same
C.	Increases
D.	Can be any of above
E.	None of the above
Answer» D. Can be any of above

Discussion

4111.	For normal operation of the transistor, the collector diode has to be
A.	Forward-biased
B.	Reverse-biased
C.	Nonconducting
D.	Operating in the breakdown region
E.	None of the above
Answer» C. Nonconducting

Discussion

4112.	In a step-down transformer, which is larger?
A.	Primary voltage
B.	Secondary voltage
C.	Neither
D.	Impossible to say
E.	None of the above
Answer» B. Secondary voltage

Discussion

4113.	Silicon atoms combine into an orderly pattern called a
A.	Crystal
B.	Covalent bond
C.	Semiconductor
D.	Valence orbit
E.	None of the above
Answer» B. Covalent bond

Discussion

4114.	The rotating coil of wire in an electric motor is called the:
A.	armature
B.	brush
C.	commutator
D.	loop
E.	None of the above
Answer» B. brush

Discussion

4115.	The direction of electron current flow is:
A.	from right to left
B.	from positive to negative
C.	from negative to positive
D.	from neutral to positive
E.	None of the above
Answer» D. from neutral to positive

Discussion

4116.	Current and voltage are said to be in phase when:
A.	their waveforms are both ac or both dc
B.	they have the same amplitude and frequency
C.	their waveforms cross through zero and reach positive and negative peaks at the same time
D.	All of the above
E.	None of the above
Answer» D. All of the above

Discussion

4117.	The generic type in a template function
A.	must be T
B.	can be T
C.	cannot be T for functions you create, but may be for C++'s built-in functions
D.	cannot be T
Answer» C. cannot be T for functions you create, but may be for C++'s built-in functions

Discussion

4118.	When a child class function is called, the compiler looks first for a matching function name in the _____
A.	class of the object using the function name
B.	immediate ancestor class
C.	base class
D.	descendant class
Answer» B. immediate ancestor class

Discussion

4119.	To be called object-oriented, a programming language must allow
A.	functions that return only a single value
B.	#include files
C.	inheritance
D.	All of the above
Answer» D. All of the above

Discussion

4120.	A function that returns no values to the program that calls it is _____
A.	not allowed in C++
B.	type void
C.	type empty
D.	type barren
Answer» C. type empty

Discussion

4121.	The keyword used to define a structure is _____
A.	stru
B.	stt
C.	struct
D.	structure
Answer» D. structure

Discussion

4122.	If container classes are carefully constructed, then these tools are available to work with structures that are not ______
A.	valid without container classes
B.	programmer-defined
C.	type-specific
D.	public
Answer» D. public

Discussion

4123.	Header files often have the file extension _____
A.	.H
B.	.HE
C.	.HEA
D.	.HEAD
Answer» B. .HE

Discussion

4124.	Some Streams work with input, and some with output
A.	True
B.	False
Answer» B. False

Discussion

4125.	If you design a class that needs special initialization tasks, you will want to design a(n) _____
A.	housekeeping routine
B.	initializer
C.	constructor
D.	compiler
Answer» D. compiler

Discussion

4126.	Which type of statement does not occur in computer programs?
A.	sequence
B.	loop
C.	denial
D.	selection
Answer» D. selection

Discussion

4127.	The newline character is always included between
A.	pair of parentheses
B.	pair of curly braces
C.	control string
D.	&
E.	None of the above
Answer» D. &

Discussion

4128.	Evaluate the following expression: 3 >6&&7>4
A.	True
B.	False
Answer» C.

Discussion

4129.	Which of the following are valid characters for a numeric literal constant?
A.	a comma
B.	a dollar sign ($)
C.	a percent sign (%)
D.	a space
E.	None of the above
Answer» F.

Discussion

4130.	A function that changes the state of the cout object is called a(n) _____
A.	member
B.	adjuster
C.	manipulator
D.	operator
Answer» D. operator

Discussion

4131.	A C++ program contains a function with the header int function(double d, char c). Which of the following function headers could be used within the same program?
A.	char function(double d, char c)
B.	int function(int d, char c)
C.	both (a) and (b)
D.	neither (a) nor (b)
Answer» C. both (a) and (b)

Discussion

4132.	A function that is called automatically each time an object is destroyed is a
A.	constructor
B.	destructor
C.	destroyer
D.	terminator
Answer» C. destroyer

Discussion

4133.	Redirection redirects
A.	a stream from a file to the screen
B.	a file from a device to a stream
C.	a device from the screen to a file
D.	the screen from a device to a stream
Answer» B. a file from a device to a stream

Discussion

4134.	You mark the beginning of a function's block of code with the _____
A.	/
B.	*
C.	{
D.	}
E.	either (c) or (d) can be used
Answer» D. }

Discussion

4135.	The best form of coupling is _____
A.	complete
B.	tight
C.	loose
D.	free
Answer» D. free

Discussion

4136.	Paying attention to the important properties while ignoring inessential details is known as________
A.	selectiveness
B.	polymorphism
C.	abstraction
D.	summarizing
Answer» D. summarizing

Discussion

4137.	What does C++ append to the end of a string literal constant?
A.	a space
B.	a number sign (#)
C.	an asterisk (*)
D.	a null character
Answer» E.

Discussion

4138.	An array name is a _____
A.	subscript
B.	formal parameter
C.	memory address
D.	prototype
Answer» D. prototype

Discussion

4139.	To enter a comment in a C++ program, you begin the comment with _____
A.	**
B.	&&
C.
D.
E.	@//
Answer» F.

Discussion

4140.	Which one of the following phrases most accurately describes a purely inductive circuit?
A.	Resistances provide the only opposition to current flow
B.	Inductive reactance provides the only opposition to current flow
C.	Combinations of resistance and inductive reactance provide any opposition to current flow
D.	The ac voltage lags the current by 90 degree
E.	None of the above
Answer» C. Combinations of resistance and inductive reactance provide any opposition to current flow

Discussion

4141.	For a pure capacitor:
A.	ac current and voltage are exactly in phase
B.	ac current leads the voltage by 90 degree
C.	ac current is converted to dc voltage
D.	ac current lags the voltage by 90 degree
E.	None of the above
Answer» C. ac current is converted to dc voltage

Discussion

4142.	Which one of the following statements best applies to a parallel RLC circuit?
A.	The voltage waveform for each component always has the same amplitude and phase as the applied voltage
B.	The sum of the current is always less than the applied current
C.	The current waveform for each component always has the same amplitude and phase as the applied current
D.	All of the above
E.	None of the above
Answer» B. The sum of the current is always less than the applied current

Discussion

4143.	The equivalent of 1 micro A is:
A.	10000A
B.	1000 A
C.	one-millionth of an ampere
D.	one million amperes
E.	None of the above
Answer» D. one million amperes

Discussion

4144.	The component that forms the electrical connection between the rotating coil of wire in a motor and the external source of electrical energy is called the:
A.	rotor
B.	armature
C.	battery
D.	commutator
E.	None of the above
Answer» E. None of the above

Discussion

4145.	In a pure inductor:
A.	ac current leads the voltage by 90 degree
B.	ac current and voltage are exactly in phase
C.	ac current lags the voltage by 90 degree
D.	ac current is converted to dc voltage
E.	None of the above
Answer» D. ac current is converted to dc voltage

Discussion

4146.	Waveforms are graphs that show:
A.	frequency on the vertical axis and amplitude on the horizontal axis
B.	amplitude on the vertical axis and frequency on the horizontal axis
C.	amplitude on the vertical axis and the passage of time on the horizontal axis
D.	the passage of time on the vertical axis and amplitude on the horizontal axis
E.	None of the above
Answer» D. the passage of time on the vertical axis and amplitude on the horizontal axis

Discussion

4147.	When the collector current increases, what does the current gain do?
A.	decreases
B.	stays the same
C.	increases
D.	any of the above
E.	None of the above
Answer» D. any of the above

Discussion

4148.	The transistor has a collector current of 10 mA and a base current of 40 mA. What is the current gain of the transistor?
A.	250 A
B.	350 A
C.	0.25 A
D.	300 A
E.	None of the above
Answer» B. 350 A

Discussion

4149.	A default catch block catches
A.	all thrown objects
B.	no thrown objects
C.	any thrown object that has not been caught by an earlier catch block
D.	all thrown objects that have been caught by an earlier catch block
Answer» D. all thrown objects that have been caught by an earlier catch block

Discussion

4150.	Adding a derived class to a base class requires fundamental changes to the base class
A.	True
B.	False
Answer» C.

Discussion

Explore topic-wise MCQs in Engineering.

Which one of the following statements is true for voltage in a series circuit?

A basic capacitor is composed of:

Which one of the following devices is most often used for measuring electrical potential difference?

The graph of current gain versus collector current indicates that the current gain

A device that converts mechanical pressure to electrical energy is called a:

Which one of the following statements is true for the voltage in a parallel RC circuit?

The Thevenin resistance is equal in value to the

Most AC power is obtained from:

Which one of the following statements is true for the currents in a parallel RL circuit?

When the Q point moves along the load line, the voltage increases when the current

For normal operation of the transistor, the collector diode has to be

In a step-down transformer, which is larger?

Silicon atoms combine into an orderly pattern called a

The rotating coil of wire in an electric motor is called the:

The direction of electron current flow is:

Current and voltage are said to be in phase when:

The generic type in a template function

When a child class function is called, the compiler looks first for a matching function name in the _____

To be called object-oriented, a programming language must allow

A function that returns no values to the program that calls it is _____

The keyword used to define a structure is _____

If container classes are carefully constructed, then these tools are available to work with structures that are not ______

Header files often have the file extension _____

Some Streams work with input, and some with output

If you design a class that needs special initialization tasks, you will want to design a(n) _____

Which type of statement does not occur in computer programs?

The newline character is always included between

Evaluate the following expression: 3 &gt;6&amp;&amp;7&gt;4

Which of the following are valid characters for a numeric literal constant?

A function that changes the state of the cout object is called a(n) _____

A C++ program contains a function with the header int function(double d, char c). Which of the following function headers could be used within the same program?

A function that is called automatically each time an object is destroyed is a

Redirection redirects

You mark the beginning of a function's block of code with the _____

The best form of coupling is _____

Paying attention to the important properties while ignoring inessential details is known as________

What does C++ append to the end of a string literal constant?

An array name is a _____

To enter a comment in a C++ program, you begin the comment with _____

Which one of the following phrases most accurately describes a purely inductive circuit?

For a pure capacitor:

Which one of the following statements best applies to a parallel RLC circuit?

The equivalent of 1 micro A is:

The component that forms the electrical connection between the rotating coil of wire in a motor and the external source of electrical energy is called the:

In a pure inductor:

Waveforms are graphs that show:

When the collector current increases, what does the current gain do?

The transistor has a collector current of 10 mA and a base current of 40 mA. What is the current gain of the transistor?

A default catch block catches

Adding a derived class to a base class requires fundamental changes to the base class

Evaluate the following expression: 3 >6&&7>4