Explore topic-wise MCQs in Engineering.

This section includes 4320 Mcqs, each offering curated multiple-choice questions to sharpen your Engineering knowledge and support exam preparation. Choose a topic below to get started.

4051.

Job Control Language (JCL) statements are Used to
A. Read the input from the slow-speed card reader to the high-speed magnetic disk
B. Specify, to the operating system, the beginning and end of a job in a batch
C. Allocate the CPU to a job
D. All of the above
Answer» C. Allocate the CPU to a job
Discussion
4052.

In analyzing the compilation of PL/I program, the term "Syntax analysis" is associated with
A. recognition of basic syntactic constructs through reductions
B. recognition of basic elements and creation of uniform symbols
C. creation of more optional matrix
D. use of macro processor to produce more optimal assembly code
Answer» B. recognition of basic elements and creation of uniform symbols
Discussion
4053.

In analyzing the compilation of PL/I program, the term "Lexical analysis" is associated with
A. recognition of basic syntactic constructs through reductions
B. recognition of basic elements and creation of uniform symbols
C. creation of more optional matrix
D. use of macro processor to produce more optimal assembly code
Answer» C. creation of more optional matrix
Discussion
4054.

Which one of the following statements most accurately applies to the frequency of a waveform?
A. The actual frequency of a sine waveform is 1.41 times the working frequency
B. Unless specified otherwise, the frequency of a waveform is assumed to be 60 Hz
C. The higher the amplitude of a waveform, the higher its frequency
D. The longer the period of a waveform, the lower its frequency
E. None of the above
Answer» B. Unless specified otherwise, the frequency of a waveform is assumed to be 60 Hz
Discussion
4055.

The merging of a free electron and a hole is called
A. Covalent bonding
B. Lifetime
C. Recombination
D. Thermal energy
E. None of the above
Answer» D. Thermal energy
Discussion
4056.

One henry of inductance is defined as:
A. the amount of counter emf required to reduce a current to 1 A
B. the amount of inductance required for generating 1 V of counter emf when the current changes at the rate of 1 A per second
C. the amount of inductance required to change the frequency of a current by 1 Hz
D. the number of turns of wire in an inductor multiplied by the amount of current flowing through it
E. None of the above
Answer» C. the amount of inductance required to change the frequency of a current by 1 Hz
Discussion
4057.

The basic unit of measurement for current is the:
A. volt
B. watt
C. ampere
D. ohm
E. None of the above
Answer» D. ohm
Discussion
4058.

Which one of. the following phrases most accurately describes the nature of a pulsating dc voltage?
A. The voltage remains at one polarity and at a steady level
B. The voltage remains at one polarity but changes value periodically
C. The voltage causes current to flow in two directions at the same time
D. The voltage reverses polarity periodically
E. None of the above
Answer» C. The voltage causes current to flow in two directions at the same time
Discussion
4059.

Which of the following assigns the number 5 to the area variable?
A. area 1 = 5
B. area = 5
C. area == 5
D. area --> 5
E. area < > 5
Answer» C. area == 5
Discussion
4060.

A base class may also be called a
A. child class
B. subclass
C. derived class
D. parent class
Answer» E.
Discussion
4061.

The _____ mode tells C++ to open a file for input
A. add::ios
B. in::file
C. ios::app
D. ios::in
E. ios::out
Answer» E. ios::out
Discussion
4062.

Using the wardrobe structure within the ShopList structure is an example of a good programming principle, known as _____
A. reusability
B. polymorphism
C. redundancy
D. recursion
Answer» B. polymorphism
Discussion
4063.

Sending a copy of data to a program module is called _______
A. passing a value
B. making a reference
C. recursion
D. setting a condition
Answer» B. making a reference
Discussion
4064.

Of the three ways to pass arguments to functions, only passing by _____ and passing by _____ allow the function to modify the argument in the calling program
A. reference, pointer
B. array, location
C. array, pointer
D. None of the above
Answer» B. array, location
Discussion
4065.

A widget is to the blueprint for a widget as an object is to
A. a member function
B. a class
C. an operator
D. a data item
Answer» C. an operator
Discussion
4066.

To use either an input or output file, the program must include the _____ header file
A. filestream.h
B. fstream.h
C. instream.h
D. inoutstream.h
E. iostream.h
Answer» C. instream.h
Discussion
4067.

C++ allows you to define the same functions more than once in the same program _____
A. if the definitions are identical
B. if the definitions are included in two separate #include files
C. if the definitions are located in a single #include file that is included more than once
D. C++ does not allow you to define the same functions more than once in the same program
Answer» E.
Discussion
4068.

If you create an instantiation of a class template with an int, and then create a second instantiation with a double, then
A. you must precede each function call with the word int or double
B. once a function is used as one type, it becomes unavailable for use with the other type
C. there is no difference in the procedure to call a member function
D. you cannot perform this operation in C++
Answer» B. once a function is used as one type, it becomes unavailable for use with the other type
Discussion
4069.

The step-by-step instructions that solve a problem are called _____
A. an algorithm
B. a list
C. a plan
D. a sequential structure
Answer» B. a list
Discussion
4070.

The type to be used in an instantiation of a class template follows ________
A. the generic class name
B. the keyword template
C. the keyword class
D. the template definition
Answer» B. the keyword template
Discussion
4071.

Which of the following statements allows the user to enter data at the keyboard?
A. cin << currentPay;
B. cin >> currentPay;
C. cout << currentPay;
D. cout >> currentPay;
E. None of the above
Answer» C. cout << currentPay;
Discussion
4072.

When you pass a variable _____, C++ passes only the contents of the variable to the receiving function
A. by reference
B. by value
C. globally
D. locally
Answer» C. globally
Discussion
4073.

Which of the following is(are) invalid string constant(s)?
A. '7.15 pm'
B. "i like e"
C. "7.3el2"
D. "1234el2"
E. None of the above
Answer» B. "i like e"
Discussion
4074.

Which of the following statements is false?
A. A function is a block of code that performs a specific task
B. Functions allow programmers to break large and complex problems into small and manageable tasks
C. Functions allow programmers to use existing code to perform common tasks
D. Functions can be called, or invoked, only once in a program
E. Programmer-defined functions can be either value-returning or void
Answer» E. Programmer-defined functions can be either value-returning or void
Discussion
4075.

You define a structure type globally because _____
A. you save many lines of code by not rewriting an identical structure definition in each function that uses it
B. you will never change its definition
C. it is required in C++
D. All of the above
Answer» B. you will never change its definition
Discussion
4076.

Overloaded functions are required to
A. have the same return type
B. have the same number of parameters
C. perform the same basic functions
D. None of the above
Answer» E.
Discussion
4077.

When the compiler cannot differentiate between two overloaded constructors, they are called
A. overloaded
B. destructed
C. ambiguous
D. dubious
Answer» D. dubious
Discussion
4078.

To expose a data member to the program, you must declare the data member in the _____ section of the class
A. common
B. exposed
C. public
D. unrestricted
E. user
Answer» D. unrestricted
Discussion
4079.

The #ifndef directive tests to see whether ________
A. a class has been defined
B. a variable has been given a value
C. a class has no variable definitions
D. any objects of the class have been instantiated
Answer» B. a variable has been given a value
Discussion
4080.

The equivalent of 1 megohms is:
A. 1 k ohm
B. 100,000 ohm
C. one-millionth of an ohm
D. one million ohms
E. None of the above
Answer» E. None of the above
Discussion
4081.

Suppose a current source has an Ideal current of 10 mA and an internal resistance of 20 MW. For what values of load resistance will the current source appear stiff?
A. 20 k Ohm or more
B. 200 k Ohm or less
C. 200 k Ohm or more
D. 20 km or less
E. None of the above
Answer» C. 200 k Ohm or more
Discussion
4082.

What is the impedance of a circuit composed of a 100 ohm resistor connected in parallel with an inductor that has a reactance of 200 W?
A. 77.7 ohm
B. 89.3 ohm
C. 88.8 ohm
D. 224 ohm
E. None of the above
Answer» C. 88.8 ohm
Discussion
4083.

What is the smallest number of polarities required for current flow?
A. One - a negative terminal
B. Two - a negative terminal and a positive terminal
C. Three - negative, positive and neutral terminals
D. Four - two negative and two positive
E. None of the above
Answer» C. Three - negative, positive and neutral terminals
Discussion
4084.

A diode is in series with 220W. If the voltage across the resister is 4V, what is the current through the diode?
A. 55 A
B. 55.86 A
C. 18.2 mA
D. 16.3 mA
E. None of the above
Answer» D. 16.3 mA
Discussion
4085.

Two diodes are in series. The first diode has a voltage of 0.75 V and the second has a voltage of 0.8 V. If the current through the first diode is 500 mA, what is the current through the second diode
A. 11 mA
B. 12 mA
C. 10 mA
D. 14 mA
E. None of the above
Answer» D. 14 mA
Discussion
4086.

The Norton current is sometimes called the
A. Shorted-load current
B. Open-load current
C. Thevenin current
D. Thevenin voltage
E. None of the above
Answer» B. Open-load current
Discussion
4087.

At room temperature a conductor has low many holes?
A. Same number as free electrons
B. many
C. Only those produced by thermal energy
D. less than the free electrons
E. None of the above
Answer» B. many
Discussion
4088.

What is the barrier potential of a silicon diode at room temperature?
A. 0.7V
B. 0.3V
C. 1 V
D. 2 m V per degree Celsius
E. None of the above
Answer» B. 0.3V
Discussion
4089.

A current source has an internal resistance of 100 kW. What is the largest load resistance if the current source must appear stiff?
A. 2 k Ohm
B. 10 k Ohm
C. 20 k Ohm
D. 1 k Ohm
E. None of the above
Answer» E. None of the above
Discussion
4090.

The value of a capacitor can be made larger by:
A. moving the plates further apart
B. moving the plates closer together
C. increasing the voltage applied to the plates
D. decreasing the voltage applied to the plates
E. None of the above
Answer» C. increasing the voltage applied to the plates
Discussion
4091.

The primary impedance of a transformer is 60 ohm and the secondary impedance is 120 ohm. What is the impedance ratio?
A. 0.25
B. 180
C. 0.5
D. 4
E. None of the above
Answer» D. 4
Discussion
4092.

Suppose a voltage source has an ideal voltage of 12V and an internal resistance of 0.5W. For what values of load resistance will the voltage source appear stiff?
A. 5 Ohm
B. 50 Ohm or more
C. 100 Ohm
D. 6 Ohm
E. None of the above
Answer» C. 100 Ohm
Discussion
4093.

A resistor has a rated value of 100 ohm and a tolerance of 10%. What is its minimum and maximum allowable resistance value?
A. 90 Ohm - 101 ohm
B. 90 Ohm - 110 ohm
C. 98 Ohm - 100.1 ohm
D. 99 Ohm - 102 ohm
E. None of the above
Answer» C. 98 Ohm - 100.1 ohm
Discussion
4094.

Electron current is flowing through a conductor in a direction you might describe as straight into this page. What is the direction of the resulting magnetic field?
A. Clockwise
B. Counterclockwise
C. Out of this page
D. Into this page
E. None of the above
Answer» C. Out of this page
Discussion
4095.

The north pole of a magnet is the one:
A. that has its molecules arranged in a random pattern
B. that would be attracted to the earth's north magnetic pole
C. that would be repelled by the south pole of another magnet
D. that would be attracted to the earth's south magnetic pole
E. None of the above
Answer» C. that would be repelled by the south pole of another magnet
Discussion
4096.

When a parallel RLC circuit is operating at its resonant frequency:
A. capacitive reactance is greater than the inductive reactance
B. inductive reactance is greater than the capacitive reactance
C. inductive reactance is equal to the capacitive reactance
D. the difference between inductive and capacitive reactance is equal to the resistance
E. None of the above
Answer» D. the difference between inductive and capacitive reactance is equal to the resistance
Discussion
4097.

Which one of the following principles best describes the basic operation of an electromagnet?
A. Current is induced in a conductor that is moving through a magnetic field
B. Like magnetic poles repel, while unlike poles attract
C. Current flowing through a conductor generates a magnetic field
D. Like magnetic poles attract, while unlike poles repel
E. None of the above
Answer» D. Like magnetic poles attract, while unlike poles repel
Discussion
4098.

The transistor has a collector current of 2 mA. If the current gain is 135, what is the base current?
A. 14.8 A
B. 10.3 A
C. 7.8 A
D. 7.75 A
E. None of the above
Answer» B. 10.3 A
Discussion
4099.

If the current gain is 200 and the collector current is 100 mA, the base current is
A. 2 mA
B. 0.5 mA
C. 2 A
D. 200 A
E. None of the above
Answer» C. 2 A
Discussion
4100.

The nucleus of the copper atom contains how many protons?
A. 1
B. 4
C. 18
D. 29
E. None of the above
Answer» E. None of the above
Discussion