Answer: False
Explanation:
Unguided medium employs an antenna for transmitting through air or vacuum.
For guided mediums the transmission is in the form of twisted copper wires, shielded twisted copper wire and optical fibres. They henceforth do not depend upon antennas for transmission through air using antennas.
Give brief comparison of Broadcast, Unicastand Multicast?
Answer:
In broadcast the message is transmitted from one to all , in uni cast we have one to one transmission and in multicast we have transmission from one to many.
Explanation:
If we take the example of a simple messaging application it will be clear. If a message is exchanged between one person to another, then it is uni casting. If a person sends a message to all the persons in his contact list then it is broadcasting and if a person sends messages to select persons in his contact list then it is multi casting. In multi casting management of the group is required regarding who can receive messages which is not required in broadcasting.
Write a conditional expression that assign the value 0 to a credits variable if it is less than 0; otherwise the value of the credits variable remains unchanged.
Answer:
credits = (credits < 0) ? 0 : credits;
Explanation:
This is the ternary conditional operator.
Answer:
void updateCredit(float credit){
if credit < 0.0
credit = 0.0;
}
Explanation:
I am going to write a C function for this.
The input is your credit value, and it has just a conditional to verify if it is not negative.
void updateCredit(float credit){
if credit < 0.0
credit = 0.0;
}
True / False
Some versions of the Von Neumann model include the stored program concept, but not all of them.
Answer: True
Explanation:
The Von Neumann model is based on the concept of stored program where both of the program and instruction data are stored in the same electronic memory. Though it is still used in many models but due to the Von Neumann bottleneck we have the introduction of the secondary memory.
Decision trees are best suitedfor:
one decision inone period.
one decision overseveral periods.
several decisionsover one period.
several decisionsover several periods.
None ofthese.
Answer: Decision Trees are best suited for several decisions over one period.
Explanation:
Decision tree gives an effective method for making decisions. It is a tree-like model used for decisions and analyses consequences, including resources cost, outcome and utility. It also helps us to make best and good quality decisions on the basis of given information. It is also widely used in machine learning and commonly used in data mining as a tool.
Data mining must usestatistics to analyze data.
True
False
Answer: True
Explanation: In data mining, they use statistics component for the analyzing of the large amount of data and helps to deal with it. Statistics provide the techniques for the analyzing, evaluating and dealing with the data that is known as data mining.Data statistics provide the help to organize large data in a proper form and then analyze it. Thus, the statement given is true that data mining must use statistics to analyse data.
Programs that are embedded in a Web page are called Java ____.
a.
consoles
b.
windowed applications
c.
applications
d.
applets
1 points
Answer:
applets
Explanation:
Java applets are dynamic programs that can be embedded on a webpage and run on a web browser like internet explorer,firefox or google chrome. The code for applets is developed using java programming language and facilitates interesting and complex display entities to be included as part of the web page. HTML provides a special tag called <Applet> for providing details of the applet.
An objective function in linearprogramming is a(n):
decisionvariable.
environmentvariable.
resultvariable.
independentvariable.
constant.
Answer: An objective function in linear programming is a decision variable.
Explanation: An objective function is a function which has the target towards the model whether it should be maximized or minimized according to the relation between the variables present in the function. There are set of variables which are responsible for the controlling of objective function that is known as decision variables.
A ____________________ can be used to hierarchically represent a classification for a given set of objects or documents. A. taxonomy B. framework C. scheme D. standard
Answer:
A. taxonomy
Explanation:
A taxonomy can be used to hierarchically represent a classification for a given set of objects or documents.
Write a program that prompts the user to enter the number of students and each student's name and score, and finally displays the student with the highest score and the student with the second highest score.
Answer:
see attachment
Explanation:
You have not specified the language, or the details of the I/O form or prompts. Here is a program that does that, written in Wolfram language (the language of Mathematica).
It prompts separately for student name and student score. The minimum score is presumed to be higher than -99999. If only one student name is entered, the second output is that score with no name listed. There is no error checking.
We have elected to keep a list only of the two two scores, and to sort that list again each time a new entry is made.
__
The attachment shows the output of the program below the program listing.
One lap around a standard high-school running track is exactly 0.25 miles. Write a program that takes a number of miles as input, and outputs the number of laps. Output each floating-point value with two digits after the decimal point, which can be achieved as follows: System.out.printf("%.2f", yourValue); Ex: If the input is:
Answer:
import java.util.Scanner;
public class Miles {
public static void main(String[] args) {
//initialization
double Number_Miles;
//print the message
System.out.print("Enter the number of miles: ");
Scanner scn1 = new Scanner(System.in);
Number_Miles = scn1.nextDouble(); //read the input from user
//calculate the laps
double yourValue = Number_Miles/0.25;
//display the output on the screen
System.out.printf("%.2f", yourValue);
}
}
Explanation:
First import the library Scanner than create the class and define the main function. In the main function, declare the variables.
print the message on the screen and then store the value enter by the user into the variable.
Scanner is a class that is used for reading the output. So, we make the object of the class Scanner and then object call the function nextDouble() which reads the input and store in the variable.
After that, calculate the number of laps by dividing the number of miles with the given one lap running track value (0.25 miles).
[tex]Number\,of\,laps = \frac{Number\,of\,miles}{0.25}[/tex]
the output is stored in the variable.
After that, print the value on the screen with 2 digits after the decimal point.
we can use "%.2f" in the printing function in java.
like System.out.printf("%.2f", output);
Answer:
def miles_to_laps(miles):
return miles / 0.25
miles = 5.2
num_of_lap = miles_to_laps(miles)
print("Number of laps for %0.2f miles is %0.2f lap(s)" % (miles, num_of_lap))
Explanation:
What is the advantages and disadvantagesof International Standards for NetworkProtocols.
Answer:
Advantages and disadvantages of international standards for network protocols are:
Advantages -
Due to common underlying standard maintenance and installation become easy. Many computers can connect together from all the worldwide, as they are using the international standard for network protocol. One of the main advantage using international standard as it boost up growth and economy.Disadvantages -
Every network standard has its own limitations in a particular domain. Once it is spread worldwide then it is difficult to resolve network issues.. Frequency band in which 99% of the total power resides iscalled _________
a. Power bandwidth
b. half power bandwidth
c. 3dB bandwidth
d. 4dB bandwidth
Answer:
Frequency band in which 99% of the total power resides iscalled Power bandwidth-a.
define the role of cache memory in computers.
Answer:
Cache memory is relatively small in size as compared to the main memory. The cache memory stores programs, variables which are frequently used by the processor.
Explanation:
The cache memory is placed very close to the processor so that the programs and variables can be accessed very quickly as and when required by the processor. The size of the cache memory is small and also cost more. There is also a secondary cache in many systems which enables to store more programs which cannot be store in the primary cache.
What is one property of a good hash code?
Answer:- Major property of a good hash code is that objects which are equal should return the same hash code .
Explanation: Hash codes is a numeric value which is used for identify a object while a equality testing .Hash code can occupy the value of any length and then returns a fixed length value. The value of hash codes are variable.
If two objects are equal then by the method of equal(object) if the hashcode() function is called on both the objects , they produce the same value.
In ________ for final fields and methods the value is assignedlater but in ______ you assign the value during declaration.
Java , C++
C++ , C#
Java , C#
C++ ,Java
Answer:
The answer to this question is Java,C++.
Explanation:
We can assign non static final variables a value with the declaration or in the constructor but this is not the case with c++ because we have to assign value during declaration and c++ equivalent of final is const keyword and there is sealed or readonly keywords in c# not final.If we do not assign value at the time of declaration the const variable will contain garbage value which cannot be changed afterwards.
Answer:
The answer to this question is Java,C++.
Explanation:
We can assign non static final variables a value with the declaration or in the constructor but this is not the case with c++ because we have to assign value during declaration and c++ equivalent of final is const keyword and there is sealed or readonly keywords in c# not final.If we do not assign value at the time of declaration the const variable will contain garbage value which cannot be changed afterwards.
.The operation signature has all the following except:
A.name of the operation B.object accepts C.algorithm ituses D.value returned by the operation
Answer: C) algorithm it uses
Explanation: The operation signature has the name of operation ,objects that it accepts and the value returned by the operation but it does not have algorithm that it uses.As algorithm defines all the steps that are to be used to find the result so signature operation does not include the whole algorithm that is to be used. The signature operation verifies the steps of the algorithm in way.
FS and GS are two___________________ in protected mode.
? segment registers
? segment selectors
? stack pointers
? register pointers
Answer:
Segment registers
Explanation:
The initial purpose behind the segment registers was to enable a program to access many distinct (big) memory sections designed to be autonomous and part of a constant virtual store.
They don't have a processor-defined objective, but instead Operating system runs them for purpose. The GS register is used in Windows 64-bit to point to constructions defined by the operating scheme. Operating system kernels usually use FS and GS to access thread-specific memory. In windows, thread-specific memory is managed using the GS register. To access cpu-specific memory, the linux kernel utilizes GS.
In a database, data is stored in spreadsheets which have rows and columns.
A.
True
B.
False
A spreadsheet is a collection of data organized into rows and columns. However, it has limitations compared to relational databases in terms of data organization and accessibility.
Explanation:A spreadsheet is a collection of data that is organized into rows and columns. Each column represents a field or attribute, while each row represents a record or data instance. While spreadsheets can function as a type of database, they have limitations in terms of data organization and accessibility compared to relational databases which use a tabular structure and allow for easier reorganization and access of data.
Non proprietary standard is also termed as____________
a. De facto standard
b. Le facto standard
c. Pre facto standard
d. Non facto standard
Answer: Option A) De facto standard
Non proprietary standard is also termed as de facto standard.
Explanation: Non proprietary standard is also termed as de facto as when the proprietary standard such as window are widely used, then it becomes de facto standard. When de facto standard is referring in terms of computers, it is an accepted application, design or language standard that is used in industry but not officially recognized.
An example of de facto standard is paper clip ion used in e-mail to represent an attachment.
What is the role of a Chief Information Officier in anorganization?
Answer and Explanation:
There are several roles of a Chief Information Officer in any organization and these are as follows:
He must fulfill his responsibility as a business leader.He must be able to make executive decisions regarding sales and purchase related matters. He must be able to deal with all the Information Technology related problems.He must be able to recruit the best candidates in the best interest of the organization.He is required to map out the ICT policy(includes procurement, external and internal standards of an organization, future proofing) and ICT strategy.He must be able to write up ICT policy with detail of its utilization and application.He must possess organizational skillsWhat are .Classification for computer softwares?
Answer: Classification of computer software are:-
System softwareApplication softwareExplanation:
System software-it is the type of software that takes input from other device ans sources and then covert it into machine language that is understood by the operating software.E.g.-UNIX Application software- it is the software that is connected with the end user through application present on the operating system which is accessed directly by the user. E.g.-Internet ExplorerWhen you declare a method as abstract method ? Can I call a abstract method from a non abstract method ?
Answer: A method without body is called abstract method. A abstract method can be called from a non abstract class or method provided it is inherited using a subclass.
Explanation:
An abstract method is a method which does not have a body, it just has opening and closing curly braces. A class having an abstract method is also declared as abstract class. We cannot make an object of the abstract class.
example : public abstract float multiply(float x, float y);
is an example of abstract method.
calling an abstract method from a non abstract method is possible provided it is inherited by a non abstract subclass.
What are fields? Instance variables? object? methods?
Answer:
Explained
Explanation:
Fields: Fields represent data and should be a noun. It should begin with a lower case letter.
Instance variable: it is a variable defined in class but outside the constructor and the method. instance variables are created when an object is instantiated.
Object: An object is the basic unit of object oriented programming language.and represents the real life entities. An object consists of state behavior and properties.
Method: Method in a collection of statements that perform some specific task and return the result to the caller.
Explain the purpose (using only two sentence in each case) of eachof the following
components of UML
• Use case diagram
• Use case description
• Class diagram
• Sequence diagram
• Business or Domain model
Answer:
UML - Unified Model Language
Explanation:
Use case diagram:
A use case diagram is used to tell how many ways a user can interact with a system. We use special symbols and connectors to build use case diagrams.
We use horizontal shaped ovals to represent use cases, stick figures to represent actors, lines to represent associations between use cases and
actors, packages to put elements into groups.
Use case description:
By the name itself, we can say that it is used to describe the activities of user that he can do with the system and how the system responds to those. Before use case diagram created, we need to write a use case description.
Class diagram:
UML diagrams are of two types. They are,
Structural UML diagrams Behavioral UML diagrams
A class diagram comes under Structural UML diagrams.
Classes are building blocks of an application that uses OOPs concepts. Class diagrams are used to represent classes, relationships, association,
interface.
Sequence diagram:
A sequence diagram comes under Behavioral UML diagrams.It is used to tell the sequential order of objects' interaction.We have many notations in this diagram like actors, lifeline, create message, delete message, lost message, found message etc. It is used to tell how messages move between objects in a system.
Domain model :
A domain model is a visual representation of real- situation objects. In UML, the Domain Model is illustrated with a set of class diagrams
What are the advantages and disadvantage of integers and floating numbers?
Answer:
Explanation:
Advantages of int and disadvantages of float are as following :-
1.Arithmetic operation on int variables are much faster than float variables.
2.int variables does not suffer from precision loss while float variable sometimes suffer from it.
Advantages of float variables and disadvantages of int variables are as following:
1.float variables can represent values between integers.While integers cannot do that.
2.Float can represent much greater range of values than integers.
A database is called "self-describing" because it contains a description of itself.
A.
True
B.
False
Answer:
true
Explanation:
Write difference in the form of a table between Ping and TraceRoute command?
Explanation:
Ping
A network utility which is mainly used to test the connection between two devices or nodes. Ping is used to test the connectivity of a network and its name resolution.Syntax: ping <ip address>TraceRoute
A network utility which is mainly used to track the path followed by a packet within a network from the source to the destination.It helps to trace the exact pathway of the data packet from the source to the destination.Syntax: tracert <ip address>
What is the height of the tallest possible red-black tree containing 31 values?
Answer:
The height of tallest possible red-black tree having 31 values is 10.
Explanation:
The height of tallest possible red-black tree = 2㏒₂(n+1)
here we have n=31 So substituting the value of n in the equation.
=2㏒₂(31+1)
=2㏒₂(32)
=2㏒₂(2⁵) since ㏒(aⁿ)=n㏒(a)
=2x5㏒₂(2)
=10㏒₂(2) since ㏒ₙ(n)=1.
=10.
for a small to medium enterprise , the benefits of setting up an e-commerce store front include ( choose all that apply)
A. The ability to offer a larger selection of products
B. the ability to reach a wider customer base
C. the ability to eliminate advertising
D. the ability to offer lower prices to customers
Answer:
All of the above
Explanation:
The ability to reach a wider customer base, the ability to offer lower prices to customers, the ability to offer a larger selection of products and the ability to eliminate advertising. The correct options are A, B, C and D.
What is e-commerce store front?An electric storefront is a web-based solution that allows business owners to advertise and sell goods and services over the internet.
This is a fundamental form of e-commerce in which the buyer and seller interact directly.
To enable merchants to sell their products online, it combines transaction processing, security, online payment, and information storage.
A storefront, also known as a shopfront, is the facade or entryway of a retail store on the ground floor or street level of a commercial building, typically with one or more display windows.
A storefront's purpose is to draw attention to a company and its products.
The makes it possible to reach a larger customer base, to offer lower prices to customers, to offer a larger selection of products, and to eliminate advertising.
Thus, all options are correct.
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what is Interrupt?and give me information about Interruptstypes and processes and works?
Answer:
Interrupt is defined as, in computer system interrupts are the signal sent to the central processing unit by the external devices. The main function of interrupt is that, an operating system that provide multiprocessing and multitasking. The interrupt is a signal that causes the operating system to stop work on one processor and started work on another processor.
There are basically two type of interrupts:
Hardware interrupts - For the processor, if the signal is from external device and hardware is called hardware interrupts.Software interrupts - The interrupt which is caused by the software instructions are called software interrupt.