Prova de 2014: Centro de Educação Superior a Distância do Estado do Rio de Janeiro (CEDERJ) — questões com gabarito

Conforme figura a seguir, cinco números reais denotados por R, S, T, U e V foram marcados em uma reta numérica, de modo que R < S < T < U < V e S – R = T – S = U – T = V – U.

                         

Se T = 1/5 e V = 1/4, então é correto afirmar que o número R é igual a:

Um círculo está inscrito em um quadrado. Sabendo-se que o perímetro do quadrado é igual a 8 cm, é correto afirmar que a área do círculo inscrito é igual a:

O valor máximo da função real f(x) = 1 /(2+cos(x)) é:

Assinale a alternativa INCORRETA.

A função orgânica é um conjunto de compostos que possuem propriedades químicas semelhantes. Dentro de cada função, a nomenclatura dos compostos segue regras aceitas internacionalmente pela IUPAC.

Em conformidade com essas exigências, o nome oficial para o H₃C-CH₂-C(CH₃)₂-CH(CH₃)-COOH é:

O hidrocarboneto de fórmula molecular C₆H₁₄ apresenta cinco formas isoméricas: n-hexano; 2-metilpentano; 3-metilpentano; 2,3-dimetilbutano e 2,2-dimetilbutano. Sobre os compostos apresentados, pode-se afirmar que

Foram dissolvidos em água 0,500 g de uma amostra de sal comum (NaCl). À solução resultante adicionou-se excesso de nitrato de prata, em meio de ácido nítrico. O precipitado branco formado, separado por filtração, lavado convenientemente e seco, pesou 1,148 g.

Assinale a resposta que apresenta a pureza da amostra analisada.

Nas pilhas, através de um fio externo, os elétrons fluem de um eletrodo em que ocorre oxidação para aquele em que ocorre redução. Se colocarmos nesse fio externo um aparelho denominado voltímetro, conseguiremos medir a força eletromotriz da pilha. Considerando uma pilha formada pelos eletrodos de Al e de Cu, cujos potenciais de redução são E⁰ (Al³⁺/Al⁰ ) = – 1,68 V e E⁰ (Cu²⁺/Cu⁰ ) = + 0,34 V, pode-se afirmar que o potencial da célula é:

A farinha de osso contém fosfato de cálcio obtido pela calcinação de ossos de animais. O fosfato de cálcio é também encontrado na crosta terrestre e constitui a matéria-prima utilizada na produção do elemento fósforo. Quando tratado com ácido sulfúrico, o fosfato de cálcio produz fertilizante fosfatado. Considerando essas informações, pode-se dizer que a fórmula molecular desse sal produzido e a massa necessária para preparar 1,0 L de solução M desse mesmo sal, respectivamente, são:

Are social networking sites addictive?

¹With the increasing popularity of wireless devices like smartphones — devices that can move lots of data very quickly — users have access to their social networks 24 hours a day. Most social networking sites have developed applications for your mobile phone, so logging on is always convenient. Social networks also tap into our human desire to stay connected with others. Besides, the rush of nostalgia as you connect with your former grade-school classmate on Facebook can be quite heady and exciting.

²But what's the main reason we find these sites so addictive? Plain old narcissism. We broadcast our personalities online whenever we publish a thought, photo, YouTube video or answer one of those “25 Things About Me" memes. We put that information out there so people will respond and connect to us. And being part of a social network is sort of like having your own entourage that follows you everywhere, commenting on and applauding everything you do. It's very seductive.

³In 2008, researchers at the University of Georgia studied the correlation between narcissism and Facebook users. Unsurprisingly, they found that the more “friends" and wall posts a user had, the more narcissistic he or she was. They noted that narcissistic people use Facebook in a selfpromoting way, rather than in a connective way. It may be an obvious theory, but it also suggests that social networks bring out the narcissist in all of us.

⁴Social networks are also a voyeuristic experience for many users. Following exchanges on Twitter or posts on Facebook and MySpace are akin to eavesdropping on someone else's conversation. It's entertaining and allows you to feel like a “fly on the wall" in someone else's life.

⁵Social networking sites also publicly list your “friends" or “followers" — giving you instant status. How many people do you know online who spend all their time trying to get more friends, more followers, more testimonials? We work hard in real life to elevate our statuses, make friends and search out boosters for our self-esteem. Online social networking provides this to us, and we don't even have to change out of our sweatshirts to get it.

(adapted from http://computer.howstuffworks.com/internet/socialnetworking/information/social-networking-sites-addictive2.htm)

Glossary

addictive: viciante; tap into: explorar/tirar proveito; broadcast: anunciar; entourage: comitiva/séquito; akin to eavesdropping: parecido com bisbilhotar; booster: aquilo que impulsiona; sweatshirts: camisetas
The use of the word 'unsurprisingly' in “Unsurprisingly, they found that the more “friends" and wall posts a user had, the more narcissistic he or she was." (paragraph 3) means that

Are social networking sites addictive?

¹With the increasing popularity of wireless devices like smartphones — devices that can move lots of data very quickly — users have access to their social networks 24 hours a day. Most social networking sites have developed applications for your mobile phone, so logging on is always convenient. Social networks also tap into our human desire to stay connected with others. Besides, the rush of nostalgia as you connect with your former grade-school classmate on Facebook can be quite heady and exciting.

²But what's the main reason we find these sites so addictive? Plain old narcissism. We broadcast our personalities online whenever we publish a thought, photo, YouTube video or answer one of those “25 Things About Me" memes. We put that information out there so people will respond and connect to us. And being part of a social network is sort of like having your own entourage that follows you everywhere, commenting on and applauding everything you do. It's very seductive.

³In 2008, researchers at the University of Georgia studied the correlation between narcissism and Facebook users. Unsurprisingly, they found that the more “friends" and wall posts a user had, the more narcissistic he or she was. They noted that narcissistic people use Facebook in a selfpromoting way, rather than in a connective way. It may be an obvious theory, but it also suggests that social networks bring out the narcissist in all of us.

⁴Social networks are also a voyeuristic experience for many users. Following exchanges on Twitter or posts on Facebook and MySpace are akin to eavesdropping on someone else's conversation. It's entertaining and allows you to feel like a “fly on the wall" in someone else's life.

⁵Social networking sites also publicly list your “friends" or “followers" — giving you instant status. How many people do you know online who spend all their time trying to get more friends, more followers, more testimonials? We work hard in real life to elevate our statuses, make friends and search out boosters for our self-esteem. Online social networking provides this to us, and we don't even have to change out of our sweatshirts to get it.

(adapted from http://computer.howstuffworks.com/internet/socialnetworking/information/social-networking-sites-addictive2.htm)

Glossary

addictive: viciante; tap into: explorar/tirar proveito; broadcast: anunciar; entourage: comitiva/séquito; akin to eavesdropping: parecido com bisbilhotar; booster: aquilo que impulsiona; sweatshirts: camisetas
According to the text, the difference between real life and online social networking is:

Are social networking sites addictive?

¹With the increasing popularity of wireless devices like smartphones — devices that can move lots of data very quickly — users have access to their social networks 24 hours a day. Most social networking sites have developed applications for your mobile phone, so logging on is always convenient. Social networks also tap into our human desire to stay connected with others. Besides, the rush of nostalgia as you connect with your former grade-school classmate on Facebook can be quite heady and exciting.

²But what's the main reason we find these sites so addictive? Plain old narcissism. We broadcast our personalities online whenever we publish a thought, photo, YouTube video or answer one of those “25 Things About Me" memes. We put that information out there so people will respond and connect to us. And being part of a social network is sort of like having your own entourage that follows you everywhere, commenting on and applauding everything you do. It's very seductive.

³In 2008, researchers at the University of Georgia studied the correlation between narcissism and Facebook users. Unsurprisingly, they found that the more “friends" and wall posts a user had, the more narcissistic he or she was. They noted that narcissistic people use Facebook in a selfpromoting way, rather than in a connective way. It may be an obvious theory, but it also suggests that social networks bring out the narcissist in all of us.

⁴Social networks are also a voyeuristic experience for many users. Following exchanges on Twitter or posts on Facebook and MySpace are akin to eavesdropping on someone else's conversation. It's entertaining and allows you to feel like a “fly on the wall" in someone else's life.

⁵Social networking sites also publicly list your “friends" or “followers" — giving you instant status. How many people do you know online who spend all their time trying to get more friends, more followers, more testimonials? We work hard in real life to elevate our statuses, make friends and search out boosters for our self-esteem. Online social networking provides this to us, and we don't even have to change out of our sweatshirts to get it.

(adapted from http://computer.howstuffworks.com/internet/socialnetworking/information/social-networking-sites-addictive2.htm)

Glossary

addictive: viciante; tap into: explorar/tirar proveito; broadcast: anunciar; entourage: comitiva/séquito; akin to eavesdropping: parecido com bisbilhotar; booster: aquilo que impulsiona; sweatshirts: camisetas
The pronoun 'they' in “They noted that narcissistic people use Facebook in a self-promoting way, rather than in a connective way"(paragraph 3) refers to

Are social networking sites addictive?

¹With the increasing popularity of wireless devices like smartphones — devices that can move lots of data very quickly — users have access to their social networks 24 hours a day. Most social networking sites have developed applications for your mobile phone, so logging on is always convenient. Social networks also tap into our human desire to stay connected with others. Besides, the rush of nostalgia as you connect with your former grade-school classmate on Facebook can be quite heady and exciting.

²But what's the main reason we find these sites so addictive? Plain old narcissism. We broadcast our personalities online whenever we publish a thought, photo, YouTube video or answer one of those “25 Things About Me" memes. We put that information out there so people will respond and connect to us. And being part of a social network is sort of like having your own entourage that follows you everywhere, commenting on and applauding everything you do. It's very seductive.

³In 2008, researchers at the University of Georgia studied the correlation between narcissism and Facebook users. Unsurprisingly, they found that the more “friends" and wall posts a user had, the more narcissistic he or she was. They noted that narcissistic people use Facebook in a selfpromoting way, rather than in a connective way. It may be an obvious theory, but it also suggests that social networks bring out the narcissist in all of us.

⁴Social networks are also a voyeuristic experience for many users. Following exchanges on Twitter or posts on Facebook and MySpace are akin to eavesdropping on someone else's conversation. It's entertaining and allows you to feel like a “fly on the wall" in someone else's life.

⁵Social networking sites also publicly list your “friends" or “followers" — giving you instant status. How many people do you know online who spend all their time trying to get more friends, more followers, more testimonials? We work hard in real life to elevate our statuses, make friends and search out boosters for our self-esteem. Online social networking provides this to us, and we don't even have to change out of our sweatshirts to get it.

(adapted from http://computer.howstuffworks.com/internet/socialnetworking/information/social-networking-sites-addictive2.htm)

Glossary

addictive: viciante; tap into: explorar/tirar proveito; broadcast: anunciar; entourage: comitiva/séquito; akin to eavesdropping: parecido com bisbilhotar; booster: aquilo que impulsiona; sweatshirts: camisetas
No quarto parágrafo, o autor usa a metáfora “fly on the wall" (uma mosca na parede) para ilustrar um comportamento que ele associa ao uso excessivo de redes sociais. Que comportamento seria esse?

Are social networking sites addictive?

¹With the increasing popularity of wireless devices like smartphones — devices that can move lots of data very quickly — users have access to their social networks 24 hours a day. Most social networking sites have developed applications for your mobile phone, so logging on is always convenient. Social networks also tap into our human desire to stay connected with others. Besides, the rush of nostalgia as you connect with your former grade-school classmate on Facebook can be quite heady and exciting.

²But what's the main reason we find these sites so addictive? Plain old narcissism. We broadcast our personalities online whenever we publish a thought, photo, YouTube video or answer one of those “25 Things About Me" memes. We put that information out there so people will respond and connect to us. And being part of a social network is sort of like having your own entourage that follows you everywhere, commenting on and applauding everything you do. It's very seductive.

³In 2008, researchers at the University of Georgia studied the correlation between narcissism and Facebook users. Unsurprisingly, they found that the more “friends" and wall posts a user had, the more narcissistic he or she was. They noted that narcissistic people use Facebook in a selfpromoting way, rather than in a connective way. It may be an obvious theory, but it also suggests that social networks bring out the narcissist in all of us.

⁴Social networks are also a voyeuristic experience for many users. Following exchanges on Twitter or posts on Facebook and MySpace are akin to eavesdropping on someone else's conversation. It's entertaining and allows you to feel like a “fly on the wall" in someone else's life.

⁵Social networking sites also publicly list your “friends" or “followers" — giving you instant status. How many people do you know online who spend all their time trying to get more friends, more followers, more testimonials? We work hard in real life to elevate our statuses, make friends and search out boosters for our self-esteem. Online social networking provides this to us, and we don't even have to change out of our sweatshirts to get it.

(adapted from http://computer.howstuffworks.com/internet/socialnetworking/information/social-networking-sites-addictive2.htm)

Glossary

addictive: viciante; tap into: explorar/tirar proveito; broadcast: anunciar; entourage: comitiva/séquito; akin to eavesdropping: parecido com bisbilhotar; booster: aquilo que impulsiona; sweatshirts: camisetas
Marque o enunciado que se refere, no texto, ao que seria a razão principal por trás do vício em redes sociais.