Questões do ENEM: Universidade Federal do Acre (UFAC)

Use os filtros para chegar às questões que interessam. Cada resultado abre em uma página própria com enunciado, alternativas e gabarito.

Resultados

230 questões encontradas. Mostrando a página 1 de 12.

  • B253531E-E8

    Química

    Sistemas Gasosos - Lei, Teoria Cinética, Equação e Mistura dos Gases. Princípio de Avogadro.
    UFAC · 2011MédioEntre para guardar nos favoritos
    Em novembro de 1783, na presença do rei Luís XVI e da rainha Maria Antonieta, foi realizado em Paris o primeiro vôo tripulado em um balão inflado com ar quente. Poucos dias depois, em dezembro do mesmo ano, o químico francês Jacques Alexandre Cesar Charles (1746 – 1823), famoso por seus experimentos com balões, foi responsável pelo segundo vôo usando um gás muito mais leve que o ar – o hidrogênio, recém descoberto à época. Mesmo apresentando grande risco de explosão, porque esse gás é altamente inflamável, a aventura teve sucesso e o hidrogênio ainda foi usado por mais de 150 anos. Imaginando-se que, para geração do hidrogênio, Charles usou cerca de 240,0 litros de solução aquosa de ácido clorídrico de concentração 12 mol.L-1 e 80,64 kg de ferro metálico puro, através da reação química representada pela equação:

    Fe(s) + 2 HCl(aq) → FeCl2(aq) + H2(g)


    Então, na temperatura de 25 ºC e pressão de 1 atm, o volume de gás hidrogênio, considerado gás ideal, para inflar o balão foi de aproximadamente:

    Dados:

    Massas Molares (g.mol-1): H = 1,0; Cl = 35,5 e Fe = 56,0;
    R = 0,082 L.atm.K-1.mol-1 (Constante Universal dos Gases);
    T (K) = T(ºC) + 273.
    Escolha uma alternativa para a questão b253531e-e8
  • B2489E2A-E8

    Química

    Equilíbrio Químico
    UFAC · 2011MédioEntre para guardar nos favoritos
    Um professor de química, em uma aula sobre ácidos e determinação de pH (potencial hidrogeniônico), resolveu diferenciar sua aula utilizando um rótulo de vinagre comercial, que continha a seguinte informação:

    Concentração de ácido acético: 6,0% m/V


    Ao explicar que o vinagre é uma solução aquosa de ácido acético (ácido etanóico), o professor deixou o seguinte questionamento valendo um ponto na média: “Qual o pH do vinagre?” As seguintes informações foram fornecidas pelo professor:  

    Imagem da questão de Química, da prova de 2011

    Assim, ganhará o ponto o aluno que responder que o pH é aproximadamente: 
    Escolha uma alternativa para a questão b2489e2a-e8
  • B2458748-E8

    Química

    Eletroquímica: Oxirredução, Potenciais Padrão de Redução, Pilha, Eletrólise e Leis de Faraday.
    UFAC · 2011FácilEntre para guardar nos favoritos
    Nos aparelhos portáteis modernos, usados com freqüência na atualidade, como filmadoras, computadores, máquinas fotográficas digitais e telefones celulares, as baterias de íons de lítio vêm sendo cada vez mais utilizadas, porque possuem inúmeras vantagens frente a outros modelos, dentre eles as de níquel e cádmio e níquel metal hidreto. Além de armazenarem muito mais energia, as baterias de lítio proporcionam um tempo maior de uso sem recarga, são mais leves, não são afetadas pelo efeito memória e podem ser recarregadas sem a necessidade de esperar a descarga total. Isso sem falar que ainda diminuem o risco ambiental, principalmente quando comparadas às baterias que contém cádmio, que é um metal pesado que produz graves efeitos tóxicos aos organismos vivos, mesmo em concentrações muito pequenas.

    A figura a seguir, ilustra um esquema do processo eletroquímico que ocorre nas baterias de íons de lítio.

    Imagem da questão de Química, da prova de 2011

    Sobre tais reações, pode-se dizer que:
    Escolha uma alternativa para a questão b2458748-e8
  • B236BC91-E8

    Matemática

    Função de 2º Grau ou Função Quadrática e Inequações
    UFAC · 2011MédioEntre para guardar nos favoritos

    Dois números x e y que satisfazem a equação Imagem da questão de Matemática, da prova de 2011 são:

    Escolha uma alternativa para a questão b236bc91-e8
  • B2199D77-E8

    Geografia

    Geologia
    UFAC · 2011FácilEntre para guardar nos favoritos
    A figura abaixo apresenta uma visão parcial da Ilha de Fernando de Noronha, pertencente ao Estado de Pernambuco.

    Imagem da questão de Geografia, da prova de 2011

    Sobre o processo de formação da Ilha de Fernando de Noronha, podemos afirmar que:
    Escolha uma alternativa para a questão b2199d77-e8
  • B2165890-E8

    Geografia

    Clima
    UFAC · 2011DifícilEntre para guardar nos favoritos
    Observe a imagem abaixo:

    Imagem da questão de Geografia, da prova de 2011
    Escolha uma alternativa para a questão b2165890-e8
  • B21306BA-E8

    Atualidades

    Guerras, Conflitos e Terrorismo na Atualidade
    UFAC · 2011MédioEntre para guardar nos favoritos
    O terrorismo é uma forma violenta de protesto conhecida desde a Antigüidade, sendo uma tentativa de desestabilização de algum regime.

    Imagem da questão de Atualidades, da prova de 2011

    A imagem acima se refere ao atentado terrorista de 11 de setembro de 2001 em Nova York. Este tipo de atentado trata-se:
    Escolha uma alternativa para a questão b21306ba-e8
  • B2101330-E8

    Atualidades

    Sociedade e Comportamento
    UFAC · 2011DifícilEntre para guardar nos favoritos
    Ele já foi um dos países mais prósperos da região, possui solos férteis, clima favorável e excelente posição geográfica para o comércio mundial. O Líbano é um pequeno país, em geral montanhoso, com 10.452 km² e aproximadamente 4 milhões de habitantes. Em relação ao Líbano, não podemos afirmar:
    Escolha uma alternativa para a questão b2101330-e8
  • B203A0DB-E8

    Geografia

    Clima
    UFAC · 2011MédioEntre para guardar nos favoritos
    Com base na figura, aponte a alternativa correta:

    Imagem da questão de Geografia, da prova de 2011
    Escolha uma alternativa para a questão b203a0db-e8
  • B2005FC1-E8

    Geografia

    Geografia Física
    UFAC · 2011MédioEntre para guardar nos favoritos
    Cada rio tem suas próprias características, que podem variar bastante ao longo de seu curso. A figura abaixo, apresenta os quatro tipos fundamentais de canal fluvial:

    Imagem da questão de Geografia, da prova de 2011

    RICCOMINI, C. et al. Rios e processos aluviais. In: TEIXEIRA, W. et al (orgs). Decifrando a terra. São Paulo: Oficina de textos, 2000, p.197. (adaptado).


    Em relação aos canais apresentados na figura, é correto afirmar:

    Escolha uma alternativa para a questão b2005fc1-e8
  • B1F0600E-E8

    Inglês

    Interpretação de texto | Reading comprehension
    UFAC · 2011DifícilEntre para guardar nos favoritos
    TEXT II

    Starting a new job
    by Rose Walker


        “You just got the phone call and the position is yours. It’s been a long time since you have started a new job and you need to prepare yourself for it. Will you really like your new position? How will the people treat you and can you get along with them? These are some of the questions that might run through your mind when you start a new job.
        Before you start your new position you need to get in the right frame of mind, so you can do the best job you can do.
        The first step in preparation for this new journey is to let all your fears go. Don’t walk into a new job with fear. This will keep you from being productive. Having negative thoughts about your new job will become a reality and this will cause problems right there. Stay in the same frame of mind you had when you applied for the position. This was something that you obviously wanted to do and was excited about doing. Keep those same thoughts and attitude when you actually start working your new job. By keeping that attitude you will eliminate a lot of your problems in the beginning with this new position. Your way of thinking will become your way of acting. Do a thorough research on your new company so you can understand what they do and how you will play a part in it.
        Have a good understanding about the company in full detail so it will give you that ease you need to have for you to succeed. This will allow you to have the confidence you will need to start this new job and you won’t feel so lost when you start interacting with your co-workers. Having the right attitude will allow you to get along with your co-workers even better. Everyone when they start a new job is considered the new kid on the block. This can make you feel left out right there, since everyone usually know everyone else and already have a comfort zone with each other. You have to let them know by being in the right frame of mind when you start that you can work with each and every one of them. If you come in with that fear, it’s going to seem like you are a unfriendly person and automatically no one will want to have anything to do with you. This will be a bad way to start off on your new job. You plan to be there for awhile and communicating with your co-workers on a daily base.
        Your attitude and the way you present yourself in the beginning is very important. It will determine how your relationship will be throughout the job. Getting along with your boss and coworkers is important, it can help you to succeed or be one of the causes to make you want to leave.
        Starting a new job can be a wonderful experience. Sure all of us are nervous about stepping into a new environment and meeting and dealing with new people. That’s what’s so exciting about it, everything is new. You have to look at it as a new journey in your life and not a dreaded trip that you have to make. Erase all those negative thoughts and fears you have so you can go in with a positive attitude that will let you be a positive person. Let this be a new spectacular and fantastic time in your life. When you stop and prepare yourself mentally for your new job, you will be a success at it.”


    http://www.essortment.com/all/startinganew_rbph.htm
    The text Starting a new job is about:
    Escolha uma alternativa para a questão b1f0600e-e8
  • B1ED634A-E8

    Inglês

    Interpretação de texto | Reading comprehension
    UFAC · 2011FácilEntre para guardar nos favoritos
    TEXT II

    Starting a new job
    by Rose Walker


        “You just got the phone call and the position is yours. It’s been a long time since you have started a new job and you need to prepare yourself for it. Will you really like your new position? How will the people treat you and can you get along with them? These are some of the questions that might run through your mind when you start a new job.
        Before you start your new position you need to get in the right frame of mind, so you can do the best job you can do.
        The first step in preparation for this new journey is to let all your fears go. Don’t walk into a new job with fear. This will keep you from being productive. Having negative thoughts about your new job will become a reality and this will cause problems right there. Stay in the same frame of mind you had when you applied for the position. This was something that you obviously wanted to do and was excited about doing. Keep those same thoughts and attitude when you actually start working your new job. By keeping that attitude you will eliminate a lot of your problems in the beginning with this new position. Your way of thinking will become your way of acting. Do a thorough research on your new company so you can understand what they do and how you will play a part in it.
        Have a good understanding about the company in full detail so it will give you that ease you need to have for you to succeed. This will allow you to have the confidence you will need to start this new job and you won’t feel so lost when you start interacting with your co-workers. Having the right attitude will allow you to get along with your co-workers even better. Everyone when they start a new job is considered the new kid on the block. This can make you feel left out right there, since everyone usually know everyone else and already have a comfort zone with each other. You have to let them know by being in the right frame of mind when you start that you can work with each and every one of them. If you come in with that fear, it’s going to seem like you are a unfriendly person and automatically no one will want to have anything to do with you. This will be a bad way to start off on your new job. You plan to be there for awhile and communicating with your co-workers on a daily base.
        Your attitude and the way you present yourself in the beginning is very important. It will determine how your relationship will be throughout the job. Getting along with your boss and coworkers is important, it can help you to succeed or be one of the causes to make you want to leave.
        Starting a new job can be a wonderful experience. Sure all of us are nervous about stepping into a new environment and meeting and dealing with new people. That’s what’s so exciting about it, everything is new. You have to look at it as a new journey in your life and not a dreaded trip that you have to make. Erase all those negative thoughts and fears you have so you can go in with a positive attitude that will let you be a positive person. Let this be a new spectacular and fantastic time in your life. When you stop and prepare yourself mentally for your new job, you will be a success at it.”


    http://www.essortment.com/all/startinganew_rbph.htm
    Read the sentences below and judge them (T) TRUE or (F) FALSE:


    I. It’s not important to have a good understanding about the new company.

    II. Your way of thinking will become your way of acting.

    III. The first step in preparation for a new job is to let your fears go.
    Escolha uma alternativa para a questão b1ed634a-e8
  • B1E3C198-E8

    Inglês

    Interpretação de texto | Reading comprehension
    UFAC · 2011DifícilEntre para guardar nos favoritos
    TEXT I

    Google Instant promises live search results

    by Maggie Shiels
    Technology reporter,
    BBC News, Silicon Valley

        
        “Google has speeded up its internet search engine by launching a product called Instant that displays results as soon as users type in queries.
         The service predicts a user's query and modifies the displayed results as more letters are typed into the search box.
         The company described it as ‘search at the speed of thought’.
        Previously Google's suggested search terms and did not reveal results until the ‘enter’ key was hit or the ‘search’ button was clicked.
    Google Instant goes live in the next week and on mobile devices by autumn.
         The service will initially be rolled out in the US, UK, Spain, Germany, France and Russia.
           Challenge to Microsoft?
         In a demo event held at San Francisco's Museum of Modern Art, Marissa Mayer, Google's vice-president of search products and user experience, typed in ‘sfm’ into the search box to demonstrate the new service.
        As she typed, results appeared instantly for ‘SF MOMA’ - the first predicted search result. In another demo, when the letter ‘w’ was entered, a list of links offering the ‘weather’ appeared along with images showing the temperature.
        ‘We've actually predicting what query you are likely to do and we're giving you results for that,’ said Ms Mayer.
           Google estimates that the typical user spends nine seconds entering a query and 15 seconds looking for answers.
            The company says Google Instant could shave between two and five seconds off a typical web search.
        ‘Google is betting all they have that speed is everything,’ Harry McCracken of technology blog Technologizer.com told the BBC.
         ‘Saving one or two seconds isn't that big of a deal. One of my instant thoughts is that I am going to see results I don't want because until I type enough that it knows what I want, it is going to show me links I am not interested in.’
         Technology commentator Robert Scoble said that the new feature would present a real challenge to Microsoft search engine Bing, which has been slowly chipping away at Google's lead in the search market.
        ‘Playing with it, it dramatically changes the way I do searches. I think it is a pretty major leap forward but this means that Bing becomes far less interesting and they now have to step up,’ said Mr. Scoble.
         Microsoft currently commands around 11% of the US search market compared to Google's 66%, according to research firm Comscore.
         Bing has gradually increased its market share since launch, although its growth has recently slowed.”


    http://www.bbc.co.uk/newstechnology-11239037. 

    In the sentence, “I think it is a pretty major leap forward but this means that Bing becomes far less interesting and they now have to step up”, the verb “to step up” would best be replaced by:
    Escolha uma alternativa para a questão b1e3c198-e8
  • B1DEB9AC-E8

    Inglês

    Interpretação de texto | Reading comprehension
    UFAC · 2011MédioEntre para guardar nos favoritos
    TEXT I

    Google Instant promises live search results

    by Maggie Shiels
    Technology reporter,
    BBC News, Silicon Valley

        
        “Google has speeded up its internet search engine by launching a product called Instant that displays results as soon as users type in queries.
         The service predicts a user's query and modifies the displayed results as more letters are typed into the search box.
         The company described it as ‘search at the speed of thought’.
        Previously Google's suggested search terms and did not reveal results until the ‘enter’ key was hit or the ‘search’ button was clicked.
    Google Instant goes live in the next week and on mobile devices by autumn.
         The service will initially be rolled out in the US, UK, Spain, Germany, France and Russia.
           Challenge to Microsoft?
         In a demo event held at San Francisco's Museum of Modern Art, Marissa Mayer, Google's vice-president of search products and user experience, typed in ‘sfm’ into the search box to demonstrate the new service.
        As she typed, results appeared instantly for ‘SF MOMA’ - the first predicted search result. In another demo, when the letter ‘w’ was entered, a list of links offering the ‘weather’ appeared along with images showing the temperature.
        ‘We've actually predicting what query you are likely to do and we're giving you results for that,’ said Ms Mayer.
           Google estimates that the typical user spends nine seconds entering a query and 15 seconds looking for answers.
            The company says Google Instant could shave between two and five seconds off a typical web search.
        ‘Google is betting all they have that speed is everything,’ Harry McCracken of technology blog Technologizer.com told the BBC.
         ‘Saving one or two seconds isn't that big of a deal. One of my instant thoughts is that I am going to see results I don't want because until I type enough that it knows what I want, it is going to show me links I am not interested in.’
         Technology commentator Robert Scoble said that the new feature would present a real challenge to Microsoft search engine Bing, which has been slowly chipping away at Google's lead in the search market.
        ‘Playing with it, it dramatically changes the way I do searches. I think it is a pretty major leap forward but this means that Bing becomes far less interesting and they now have to step up,’ said Mr. Scoble.
         Microsoft currently commands around 11% of the US search market compared to Google's 66%, according to research firm Comscore.
         Bing has gradually increased its market share since launch, although its growth has recently slowed.”


    http://www.bbc.co.uk/newstechnology-11239037. 

    Choose the alternative that best completes the sentence:


    According to Google, it takes _________ seconds for a typical user to do a web search.
    Escolha uma alternativa para a questão b1deb9ac-e8
  • B1DBB1DA-E8

    Inglês

    Interpretação de texto | Reading comprehension
    UFAC · 2011MédioEntre para guardar nos favoritos
    TEXT I

    Google Instant promises live search results

    by Maggie Shiels
    Technology reporter,
    BBC News, Silicon Valley

        
        “Google has speeded up its internet search engine by launching a product called Instant that displays results as soon as users type in queries.
         The service predicts a user's query and modifies the displayed results as more letters are typed into the search box.
         The company described it as ‘search at the speed of thought’.
        Previously Google's suggested search terms and did not reveal results until the ‘enter’ key was hit or the ‘search’ button was clicked.
    Google Instant goes live in the next week and on mobile devices by autumn.
         The service will initially be rolled out in the US, UK, Spain, Germany, France and Russia.
           Challenge to Microsoft?
         In a demo event held at San Francisco's Museum of Modern Art, Marissa Mayer, Google's vice-president of search products and user experience, typed in ‘sfm’ into the search box to demonstrate the new service.
        As she typed, results appeared instantly for ‘SF MOMA’ - the first predicted search result. In another demo, when the letter ‘w’ was entered, a list of links offering the ‘weather’ appeared along with images showing the temperature.
        ‘We've actually predicting what query you are likely to do and we're giving you results for that,’ said Ms Mayer.
           Google estimates that the typical user spends nine seconds entering a query and 15 seconds looking for answers.
            The company says Google Instant could shave between two and five seconds off a typical web search.
        ‘Google is betting all they have that speed is everything,’ Harry McCracken of technology blog Technologizer.com told the BBC.
         ‘Saving one or two seconds isn't that big of a deal. One of my instant thoughts is that I am going to see results I don't want because until I type enough that it knows what I want, it is going to show me links I am not interested in.’
         Technology commentator Robert Scoble said that the new feature would present a real challenge to Microsoft search engine Bing, which has been slowly chipping away at Google's lead in the search market.
        ‘Playing with it, it dramatically changes the way I do searches. I think it is a pretty major leap forward but this means that Bing becomes far less interesting and they now have to step up,’ said Mr. Scoble.
         Microsoft currently commands around 11% of the US search market compared to Google's 66%, according to research firm Comscore.
         Bing has gradually increased its market share since launch, although its growth has recently slowed.”


    http://www.bbc.co.uk/newstechnology-11239037. 

    By saying “We’ve actually been predicting what query you are likely to do and we’re giving you results for that”, Google’s vice-president means:
    Escolha uma alternativa para a questão b1dbb1da-e8
  • B1D8C9D8-E8

    Inglês

    Interpretação de texto | Reading comprehension
    UFAC · 2011MédioEntre para guardar nos favoritos
    TEXT I

    Google Instant promises live search results

    by Maggie Shiels
    Technology reporter,
    BBC News, Silicon Valley

        
        “Google has speeded up its internet search engine by launching a product called Instant that displays results as soon as users type in queries.
         The service predicts a user's query and modifies the displayed results as more letters are typed into the search box.
         The company described it as ‘search at the speed of thought’.
        Previously Google's suggested search terms and did not reveal results until the ‘enter’ key was hit or the ‘search’ button was clicked.
    Google Instant goes live in the next week and on mobile devices by autumn.
         The service will initially be rolled out in the US, UK, Spain, Germany, France and Russia.
           Challenge to Microsoft?
         In a demo event held at San Francisco's Museum of Modern Art, Marissa Mayer, Google's vice-president of search products and user experience, typed in ‘sfm’ into the search box to demonstrate the new service.
        As she typed, results appeared instantly for ‘SF MOMA’ - the first predicted search result. In another demo, when the letter ‘w’ was entered, a list of links offering the ‘weather’ appeared along with images showing the temperature.
        ‘We've actually predicting what query you are likely to do and we're giving you results for that,’ said Ms Mayer.
           Google estimates that the typical user spends nine seconds entering a query and 15 seconds looking for answers.
            The company says Google Instant could shave between two and five seconds off a typical web search.
        ‘Google is betting all they have that speed is everything,’ Harry McCracken of technology blog Technologizer.com told the BBC.
         ‘Saving one or two seconds isn't that big of a deal. One of my instant thoughts is that I am going to see results I don't want because until I type enough that it knows what I want, it is going to show me links I am not interested in.’
         Technology commentator Robert Scoble said that the new feature would present a real challenge to Microsoft search engine Bing, which has been slowly chipping away at Google's lead in the search market.
        ‘Playing with it, it dramatically changes the way I do searches. I think it is a pretty major leap forward but this means that Bing becomes far less interesting and they now have to step up,’ said Mr. Scoble.
         Microsoft currently commands around 11% of the US search market compared to Google's 66%, according to research firm Comscore.
         Bing has gradually increased its market share since launch, although its growth has recently slowed.”


    http://www.bbc.co.uk/newstechnology-11239037. 

    Read the sentences below and judge them (T) TRUE or (F) FALSE:


    I. Google Instant makes the queries faster.

    II. With Google Instant query results will be revealed before the enter button is hit.

    III. Search terms will not be suggested anymore.

    IV. Mobile users will not have access until autumn.

    V. Initially the service will not be available for the British people.
    Escolha uma alternativa para a questão b1d8c9d8-e8
  • B1C9F4B8-E8

    Biologia

    Identidade dos seres vivos
    UFAC · 2011FácilEntre para guardar nos favoritos
    O coração é formado na sua maioria por músculo, sendo responsável pelo bombeamento do sangue no corpo. Sua atividade é realizada durante toda nossa vida. No gráfico abaixo, está demonstrado o fluxo de sangue na aorta ao longo do tempo.

    Imagem da questão de Biologia, da prova de 2011


    Sobre o gráfico, é correto afirmar que:
    Escolha uma alternativa para a questão b1c9f4b8-e8
  • B1BDB684-E8

    Biologia

    Hereditariedade e diversidade da vida
    UFAC · 2011MédioEntre para guardar nos favoritos
    O raquitismo hipofosfatêmico é uma doença hereditária de caráter dominante ligada ao sexo. Ela acarreta um aumento da excreção do fosfato e alterações nos mecanismos de deposição mineral nos ossos. Suas principais conseqüências são deformidades ósseas, crescimento reduzido, formação anormal dos dentes e alterações metabólicas da vitamina D.


    A figura abaixo, mostra o heredograma de uma família afetada pelo raquitismo hipofosfatêmico.

    Imagem da questão de Biologia, da prova de 2011


    Assinale a alternativa correta:
    Escolha uma alternativa para a questão b1bdb684-e8