Questões de Concurso para INT

Q2467206

Ano: 2024 Banca: Instituto Access Órgão: INT Prova: Instituto Access - 2024 - INT - Pesquisador - Catálise |

Q2467206 Química

No difratograma de raios X de pó de uma amostra de um material do tipo MCM mesoporoso com poros de diâmetro de 30 Å, obtido utilizando radiação com comprimento de onda 1,54 Å, o primeiro pico aparece em 2θ = 2,2°. Considerando que um material hexagonal possui a = b ≠ c, α = β = 90°, γ = 120°, qual é a espessura aproximada das paredes do material? (Dados: sen 1,1 = 0,02, sem 60 = 0,87).

A

46 Å.

B

40 Å.

C

30 Å.

D

16 Å.

E

10 Å.

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Q2467205

Ano: 2024 Banca: Instituto Access Órgão: INT Prova: Instituto Access - 2024 - INT - Pesquisador - Catálise |

Q2467205 Química

O craqueamento catalítico fluido (FCC, do inglês Fluid Catalytic Cracking) é um dos processos mais importantes utilizados nas refinarias de petróleo, e emprega zeólitas como componentes dos catalisadores. Entre as várias propriedades da zeólitas, a acidez é um fator que tem grande influência sobre a sua atividade catalítica. A respeito da acidez desses materiais, assinale a alternativa correta.

A

A razão Si/Al em uma zeólita não afeta a sua acidez total.

B

Quanto maior a razão Si/Al em uma zeólita, maior será a sua acidez total.

C

As zeólitas, de forma geral, apresentam apenas sítios ácidos de Lewis.

D

A acidez de zeólitas pode ser quantificada utilizando-se a técnica de dessorção de gás hidrogênio à temperatura programada.

E

Os sítios ácidos nas zeólitas podem variar tanto quanto à sua natureza (Brønsted ou Lewis) quanto à sua força.

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Q2467204

Ano: 2024 Banca: Instituto Access Órgão: INT Prova: Instituto Access - 2024 - INT - Pesquisador - Catálise |

Q2467204 Química

Sobre a técnica de difração de raios X (DRX) de amostras policristalinas, são feitas as seguintes afirmações:

I. O padrão de difração de uma amostra policristalina pode ser utilizado para identificar as diferentes fases cristalinas presentes nela.

II. Para amostras policristalinas de nanopartículas, quanto mais largos os picos de difração, maior será o tamanho médio das nanopartículas.

III. A posição de um pico de difração (2θ) é independente da fonte de radiação utilizada.

É correto afirmar que

A

apenas a afirmativa I é verdadeira.

B

apenas as afirmaçtivas I e III são verdadeiras.

C

apenas as afirmativas I e II são verdadeiras.

D

todas as afirmativas são verdadeiras.

E

nenhuma afirmativa é verdadeira.

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Q2467203

Q2467203 Inglês

Choose the best alternative: “Brazilians’ sense of belief in institutions _____ .”

A

have been increasing

B

are increasing

C

hasn’t increased

D

have increased

E

aren’t increasing

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Q2467202

Q2467202 Inglês

Choose the best alternative: “People have changed to virtual political protests, _____?”

A

hadn’t they?

B

have they?

C

hasn’t it?

D

haven’t they?

E

didn’t they?

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Q2467200

Q2467200 Inglês

Texto associado

04.08.2024

‘We have reached the limit.’ Clash with Elon Musk prompts calls for social media controls in Brazil

London (CNN) — Brazil’s attorney general has called for social media platforms in the country to be regulated after Elon Musk threatened to disobey a court order banning certain accounts on X and lashed out against “aggressive censorship.”

In a post on X Sunday, Attorney General Jorge Messias wrote: “It is urgent to regulate social networks. We cannot live in a society in which billionaires domiciled abroad have control of social networks and put themselves in a position to violate the rule of law, failing to comply with court orders and threatening our authorities.”

In a statement, Brazil’s Supreme Court described Musk’s defiance as a “flagrant” obstruction of justice and said he should be investigated by the police. Supreme Court Justice Alexandre de Moraes announced Sunday that he would open an inquiry into the billionaire businessman who owns X.

The standoff is the latest clash between authorities around the world and Musk – a self-declared “free speech absolutist” who has relaxed X’s content moderation policies and reinstated a number of previously blocked accounts after buying the company, formerly known as Twitter, in 2022.

Orlando Silva, a Brazilian lawmaker aligned with the country’s leftwing government, said he would propose a “responsibilities regime for these digital platforms.” “We have reached the limit!” he posted on X, adding that Musk had disrespected the judiciary. On Saturday, X’s global government affairs team posted that it had been “forced by court decisions to block certain popular accounts in Brazil” and threatened with “daily fines” for non-compliance. “We do not know which posts are alleged to violate the law. We are prohibited from saying which court or judge issued the order, or on what grounds,” they wrote. They do not believe the orders are constitutional and will challenge them legally where possible, they added.

The Supreme Court had ordered that the accounts be blocked as part of its ongoing investigation into “digital militias,” which, among other things, is looking into the spread of misinformation and incitement of crime under the government of former far-right President Jair Bolsonaro.

Social media platforms have been widely viewed as a catalyst for riots in Brazil that took place on January 8 last year, when hundreds of protesters broke into federal government buildings in the capital Brasilia, in scenes reminiscent of the January 6, 2021, insurrection in the United States.

Musk suggested that Moraes was behind the ban, writing Sunday on X that the judge had “brazenly and repeatedly betrayed the constitution and people of Brazil. He should resign or be impeached.”

In a separate post Saturday, he called the court’s decision to block the accounts “aggressive censorship” that “appears to violate the law and will of the people of Brazil.” He said X would defy the court’s order and lift all restrictions.

“As a result, we will probably lose all revenue in Brazil and have to shut down our office there. But principles matter more than profit,” he noted.

X has faced criticism for accommodating government censorship demands in the past, with Musk saying the company has no choice but to comply. For example, it blocked some X accounts in Turkey at the behest of the government ahead of the country’s elections last year, while at the same time contesting the orders in court.

(Internet: < https://edition.cnn.com/2024/04/08/tech/elon-musk-brazilinvestigation/index.html> )

From the sentence “Social media platforms have been widely viewed as a catalyst for riots in Brazil that took place on January 8 last year, when hundreds of protesters broke into federal government buildings in the capital Brasilia, in scenes reminiscent of the January 6, 2021, insurrection in the United States”, it is possible to say that

A

the investigations carried out in the United States pointed to the existence of a North American insurrection virtual arm that currently exists in Brazil to make viable the protests that took place after the elections.

B

the verifiable similarity between the events that occurred in the United States and Brazil is conclusive regarding determining motivating facts and same leadership.

C

violent protests are increasingly associated with massive movement on social media and this occurred in a similar way in Brazil and the United States.

D

both in Brazil and in the United States, it was possible to observe that all the organization of violent protests began with virtual incitements without the verification of isolated attitudes.

E

there is a direct and inescapable relationship between the use of social media and the user's propensity to become violent when in the presence of opponents.

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Q2467199

Q2467199 Inglês