Managing Data Frames in R language

The data frame is a key data structure in statistics and in R.The dplyr package is designed to explore the functionality of Data frames.One important contribution of the dplyr package is that it provides a “grammar” (in particular, verbs) for data manipulation and for operating on data frames.

dplyr Grammar
Some of the key “verbs” provided by the dplyr package are
• select: return a subset of the columns of a data frame, using a flexible notation
• filter: extract a subset of rows from a data frame based on logical conditions
• arrange: reorder rows of a data frame
• rename: rename variables in a data frame
• mutate: add new variables/columns or transform existing variables
• summarise / summarize: generate summary statistics of different variables in the data frame,
possibly within strata
• %>%: the “pipe” operator is used to connect multiple verb actions together into a pipeline
 
to Install package

> install.packages("dplyr")

After installing the package it is important that you load it into your R session with the library()
function.
> library(dplyr)

GLOBAL IT INDUSRIES--- QUIZ

Q 1 “Think Different” tagline belongs to

A) Microsoft               B) Apple         C)Facebook                 D)Linkedin

Q 2 Most popular video search engine

A) Yahoo                    B)Altavisa       C)Google                    D)Youtube

Q 3 Head Quarter of Twitter Located  in

A) San Francisco, California              B) Menlo Park, California,    C) Mountain View, California          D) Cupertino, California

Q 4 Facebook written in which of following language

A) C++, PHP              B) Java                        C)Javascript,Scala,HTML                   D)Ruby

Q  5 Twitter written in which of following language

A) C++, PHP              B) Dot Net      C)Javascript, Scala, Java                     D)HTML

Q  6 Which of following social media platform allows to follow people and Trending Topics

A) Google+     B)Instagram    C)Facebook                 D)Twitter

Q  7 Post length of Twitter

A) Unlimited   B) 140 Characters       C) 141 Characters                   D) 142 Characters

Q  8 Linkedin Written in which of following language

A) C++, PHP              B) Java                        C)Javascript,Scala,HTML                   D)Ruby

Q  9 CEO Jeff Weiner belongs to which of following

A) Google+     B)Instagram    C)Linkedin      D)Twitter

Q  10 Alibaba belongs to which of following

A) E-commerce           B) Social Media          C) Messenger App      D)Gaming

Q 11 Headquarter of FlipKart

A) New Delhi B) Chennai      C) Bangalore   D) Hydrabad

Q  12 Headquarter of Snapdeal

A) New Delhi B) Chennai      C) Bangalore   D) Hydrabad

Q  13 Tagline “India’s Largest Online Fashion Store” belongs to

A) Snapdeal    B) Myntra       C) Ebay           D) Flipkart

Q 14  Android O.S developed by

A) Google       B) Microsoft   C) Apple         D) Blackberry

Q  15 Latest version of Android

A) Lollipop     B) Nougat       C) Marshmallow         D) KitKat 

Q  16 Whatsapp Written in which language

A) Erlang        B) HTML        C) Javascript   D) Dot Net

Q  17 Headquarter of TCS

A) New Delhi B) Pune           C) Mumbai      D) Gurgaon

Q 18 Headquarter of Wipro

A) New Delhi B) Chennai      C) Bangalore   D) Hydrabad

Q  19 Headquarter of HCL

A) New Delhi             B) Noida         C) Mumbai      D) Gurgaon

Q  20 CEO Vishal Sikka Belongs to which of following organization

A) Infosys       B) TCS            C) Wipro         D) HCL

Quiz for computer Science

1. The use of the Internet or other electronic means to stalk or harass an invidual, a group of individuals, or an organisation is termed:

(a)Cyberspace

(b)Cyberstalking

(c)Pornography

(d)None of these

Ans. Cyberstalking

3. Which of the following is a cyber crime?

(a)Hacking

(b)Worm attack

(c)Virus attack

(d)All of these

Ans. All of these

4. .......... Refers to email that appears to have been originated from one source when it was actually sent from another source.

(a)Email bombing

(b)Email spoofing

(c)Email spamming

(d)None of these

Ans. Email spoofing

5. A program that has capability to infect other programs and make copies of itself and spread into other programs is called:

(a)Worm

(b)Virus

(c)Trojan

(d)None of these

Ans. Virus

6. A type of cyber crime that occurs in pay per click online advertising when a person, automated script or computer program imitates a legitimate user of a web browser clicking on an ad, for the purpose of generating a charge per click without having actual interest in the target of the ad’s link.

(a)Phishing

(b)Zombie

(c)Click fraud

(d)None of these

Ans. Click fraud

7. In cyber law terminology ‘DoS’ means:

(a)Denial of Service

(b)Disc operating System

(c)Distant operator Service

(d)None of these

Ans. Denial of Service

8. The Indian Parliament passed the Information Technology Bill, which is regarded as the mother legislation regulating the use of computers, computer systems and computer networks as also data and information in the electronic format, in the year:

(a)2000

(b)2001

(c)2002

(d)2003

Ans. 2000

9. The seat of the Asian School of Cyber Laws:

(a)New Delhi

(b)Pune

(c)Chennai

(d)Hyderabad

Ans. Pune

10. Which of the following is an example of ‘denial of service attack’?

(a)Attempts to “flood” a network, thereby preventing legitimate network traffic

(b)Attempts to disrupt connections between two machines, thereby preventing access to a service

(c)Attempts to prevent a particular individual from accessing a service

(d)All of these

Ans. All of these

11. .......... Is a computer connected to the internet that has been compromised by a hacker, computer virus or jrojan horse and can be used to perform malicious tasks of one sort of another under remote direction.

(a)Server

(b)Zombie

(c)Symbian

(d)None of these

Ans. Zombie

12. Which one of the following is not an example of ‘using computer as a weapon’?

(a)Cyber Terrorism

(b)IPR violations

(c)Credit and Frauds

(d)All of these

Ans. All of these

13. .......... refers to sending email to thousands and thousands of users-similar to a chain letter.

(a)Email spamming

(b)Email bombing

(c)Trojan attack

(d)None of these

Ans. Email spamming

14. According to a report on crimes in India in 2011, published by the National Crime Records Bureau, the largest number of cyber crimes were registered in:

(a)Maharashtra

(b)Uttar Pradesh

(c)Karnataka

(d)Andra Pradesh

Ans. Andra Pradesh

15. By hacking web server taking control on another persons website called as web ..........

(a)Spoofing

(b)Hijacking

(c)Spamming

(d)None of these

Ans. Hijacking

16. Programs that multiply like viruses but spread from computer to computer are called as:

(a)Worms

(b)Virus

(c)Boot

(d)None of these

Ans. Worms

17. The attempt to acquire information such as usernames, passwords, and credit card details by masquerading as a trustworthy entity in an electronic communication is termed:

(a)Spamming

(b)Phishing

(c)Spoofing

(d)None of these

Ans. Phishing

18. Which agency made the investigation related to India’s First Cyber Crime Conviction?

(a)Mumbai Police

(b)Chennai Police

(c)CBI

(d)Kerala Police

Ans. CBI

19. Which one of the following is an example of E-mail and Internet Relay Chat (IRC) related crimes?

(a)Email spoofing

(b)Email spamming

(c)Email bombing

(d)All of these

Ans. All of these

20. .......... Is characterized by abusers repeatedly sending an identical email message to a particular address:

(a)Email Spoofing

(b)Email Spamming

(c)Email Bombing

(d)None of these

Ans. Email Bombing

1. What type of devices are computer speakers and headphones?

Answer: Output device

2. Who discovered Unix operating system?

Answer: Dennis Ritchie

3. The ........... of system includes the programs and instructions?

(a) Icon

(b) Hardware

(c) Software

(d) Information

Answer: Software

4. What is the full form of USB?

Answer: Universal Serial Bus

5. What is the full form of WWW?

Answer: World Wide Web

6. Who invented computer mouse?

Answer: Douglas Engelbart

7. Who invented QWERTY type Keyboard?

Answer: Christopher Sholes

8. Who invented Compact Disc (CD)?

Answer: James Russell

9. Who is known as the Father of Internet?

Answer: Vint Cerf

10. Who is known as the Father of World Wide Web?

Answer: Tim Berners Lee

11. Who invented Integrated Circuit (IC) chips?

Answer: Jack Kilby and Robert Noyce

12. Which is the Super Computer developed by India?

Answer: Param

13. Conversion of computer generated result into human acceptable form is a function of:

Answer: Output interface

14. Which type of files having the extensions .jpg, .png, .gif etc?

Answer: Image files

15. What is the full form of pdf?

Answer: Portable Document Format

16. Which of the following is a Web Browser?

(a) Unix

(b) Linux

(c) Fire fox

(d) Android

Answer: Fire fox

17. The exponent of Hotmail?

Answer: Sabeer Bhatia

18. A device that connects to a computer network without the use of cables is said to be:

Answer: Wireless

19. Which one of the following is a standard code used to exchange information among data processing and communication system?

(a) ANSI

(b) ASCII

(c) ACM

(d) APL

Answer: ASCII

20. What is the full form of ASCII?

Answer: American Standard Code for Information Interchange

1. "Stored Program Concept" postulated by:

Ans. John von neumann

2. Founder of the social networking website 'Facebook':

Ans. Mark Elliot Zuckerberg

3. Name associated with Open Source Program:

Ans. Richard Stallman

4. The main routes that data travels over the internet is called:

Ans. Internet backbone

5. An IT term refers to allowing someone to open web pages and see web sites on the internet.

Ans. Web Surfing

6. An internet protocol that allows quick file tarnsmission to remote computers is know as:

Ans. FTP

7. Protocol used to temporarily store new messages in your mailbox on an e-mail server is known as:

Ans. POP

8.Company which maintains internet computers and telecommunications equipment in order to provide internet access to businesses, organizations and individuals is called:

Ans. Internet Service Provider

9. The device that protects all computers in the network from many attacks is called:

Ans. Firewall

10. Free telephone style conversations to travel over the internet to virtually anywhere in the world is known as:

Ans. Internet Telephony

1.What is 'Arrandale' ?
Ans:Intel Processor
2.Who wrote the book "Mattoru Dot Com Sandyayil"
Ans:Sethu
3.What is 'Cyber Squatting' ?
Ans:Cybersquatting is registering, trafficking in, or using a domain name with bad faith intent to profit from the goodwill of a trademark belonging to someone else.
4.In which category does 'Youku.com' belogs ?
Ans:Video site
5.What is the full formof EBT ?
Ans:Electronic Benefit Transfer
6.Expand EDGE
Ans:Enhanced Data rate for GSM Evolution
7.The International CES ?
Ans: is a major technology-related trade show held each January in the United States.Hosts preview of products and new product announcements
8.What is 'Siri' ?
Ans:Siri is an intelligent personal assistant and knowledge navigator which works as an application for Apple's iOS. 

9.What was created by 'Pyra Labs' and later sold to other

company ?
Ans:Blogger
10.What is 'Passbook' according to iPhone ?
Ans:Passbook is an application in iOS that allows users to store coupons,boarding passes,event tickets,store cards,'generic' cards and other forms of Mobile Payment
11.DIASPORA is a nonprofit,user owned,distributed ___________ ?
Ans:Social Network
12.C-DAC headquarters is in __________ ?
Ans:Pune
13.Eka is a _____________ ?
Ans: Supercomputer
14.Computational Research Laboratory is a wholly owned subsidiary of _______?
Ans:TATA Sons
15.Share-alike is related to what ?
Ans:Share-alike is a copyright licensing term
16.Expand FOSS ?
Ans:Free and Open Source Software
17.What is 'Jelly Bean' ?
Ans:Android Version
18.When is world computer literacy day celebrated ?
Ans: December 2
19.What is 'Yandex' ?
Ans:Search Engine
20.Who developed 'Libre Office' ?
Ans:The Document Foundation

1.What is 'Arrandale' ?
Ans:Intel Processor
2.Who wrote the book "Mattoru Dot Com Sandyayil"
Ans:Sethu
3.What is 'Cyber Squatting' ?
Ans:Cybersquatting is registering, trafficking in, or using a domain name with bad faith intent to profit from the goodwill of a trademark belonging to someone else.
4.In which category does 'Youku.com' belogs ?
Ans:Video site
5.What is the full formof EBT ?
Ans:Electronic Benefit Transfer
6.Expand EDGE
Ans:Enhanced Data rate for GSM Evolution
7.The International CES ?
Ans: is a major technology-related trade show held each January in the United States.Hosts preview of products and new product announcements
8.What is 'Siri' ?
Ans:Siri is an intelligent personal assistant and knowledge navigator which works as an application for Apple's iOS.
9.What was created by 'Pyra Labs' and later sold to other company ?
Ans:Blogger
10.What is 'Passbook' according to iPhone ?
Ans:Passbook is an application in iOS that allows users to store coupons,boarding passes,event tickets,store cards,'generic' cards and other forms of Mobile Payment
11.DIASPORA is a nonprofit,user owned,distributed ___________ ?

Ans:Social Network

12.C-DAC headquarters is in __________ ?

Ans:Pune
13.Eka is a _____________ ?
Ans: Supercomputer
14.Computational Research Laboratory is a wholly owned subsidiary of _______?
Ans:TATA Sons
15.Share-alike is related to what ?
Ans:Share-alike is a copyright licensing term
16.Expand FOSS ?
Ans:Free and Open Source Software
17.What is 'Jelly Bean' ?
Ans:Android Version
18.When is world computer literacy day celebrated ?
Ans: December 2
19.What is 'Yandex' ?
Ans:Search Engine
20.Who developed 'Libre Office' ?
Ans:The Document Foundation

1. When Is Computer Literacy Day?
   Ans: Dec 2
2. Who Is The Author Of "Weaving The Web"?
   Ans: Tim Berners Lee
3. Who Is Known As Human Computer?
   Ans: Shakuntala Devi
4. "Do No Evil" Is The Tagline Of?
   Ans: Google
5. First Indian Daily To Get Online Edition?
   Ans: Deepika
6. Identify?
   Ans:Edward Snowden
7. First Microprocessor?
   Ans: Intel 4004
8. What Is Netizen?
   Ans: Net Citizen
9. Identify?
   Ans: WikiLeaks
10. Expand SOPA?
    Ans: Stop Online Piracy Act
11. The Tux Logo Was Designed By?
    Ans: Larry Erwing
12. Name The Malayalam Web Browser By C-DIT?
    Ans: വെബ്‌ ദർശിനി 
13. Identify?
    Ans: Malayalam Unicode Fonts
14. Identify?
    Ans: Google Self Driving Car
15. How To Type "അമ്മ " In Malayalam?
    Ans: Shift+DCDC
16. Identify?Vinton Cerf
17. Expand WIKI?
    Ans: What I Know Is
18. What Is Google Plus?
    Ans: A Social Network From Google
19. "Western Indian Products" Is Commonly Known As?
    Ans: Wipro
20. What Is The Keyboard Short Cut For Save As?
    Ans: Ctrl+Shift+S
21. Expand Victers?
    Ans: Virtual Classroom Technology On EDUSAT For Students
22. Who Is The CEO Of Datawind?
    Ans: Suneeth Singh Tully
23. Expand W3C?
    Ans: World Wide Web Consorsium
24. Name The Open Source Software KSEB Uses For Billing?
    Ans: Oruma

1. Speak to tweet is the service provided by which internet giant?

            Google

2. Who is the father of free software foundation?

           Richard Mathew Stalman

3. Expand SOPA

            Stop online piracy act

4. What is the relation between Craig Silverstain and Google?

  He is the first employee of Google

5. Xoom is the tablet computer introduced by which company?

            Motorola

6. Who is the author of the book “Go kiss the world”?

            Subrato Bagchi

7. Expand CAT related to law

            Cyber applet tribunal

8. Which is the tablet computer introduced by Amazon?

            Amazon kindle fire

9. Expand SAMEER

 Society for applied microwave electronics engineering and research

10. Expand VSAT

            Very small aperture terminal

11. WIT is the NASDAQ code of which Indian company?

        Wipro

12. Who is the prince invested 300 million dollars in Twitter?

            Al Waleed Bin Talal

13. What is SIRI?

            Voice commanding system in Apple i phone 4s

14. Who is the father of C programming passed away recently?

            Dennis Ritchie

15. What is F8 related to Facebook?

 Annual developers conference

16. What is IMPS banking system?

            Inter banking mobile payment system

17. World computer literacy day is celebrated on

            December 2

18. What is ice cream sandwich ?            Android OS 4.0

19. Satyam computers is known today as

            Mahindra Satyam

20. In Trivandrum technopark what is T BIC?

            Technopark business incubation centre

21.Expand CATFOSS

            Centre for advanced training in free and open source software

22. Who is the current (as on 2012 January) Kerala IT minister?

            P K Kunjalikutty

23. What is Opera mini?

            Mobile phone web browser

24. One of the directors of Walt Disney company passed away recently who is that?

            Steve Jobs

25. What is Spam related to e-mails?

  
         Unwanted emails