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Milhares de questões atuais de concursos.

Questões de Concurso – Aprova Concursos

Milhares de questões com o conteúdo atualizado para você praticar e chegar ao dia da prova preparado!


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Exibindo questões de 9 encontradas. Imprimir página Salvar em Meus Filtros
Folha de respostas:

  • 1
    • Certo
    • Errado
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    • Errado
  • 3
    • Certo
    • Errado
  • 4
    • Certo
    • Errado
  • 5
    • Certo
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  • 6
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  • 7
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  • 8
    • Certo
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  • 9
    • Certo
    • Errado

Jack Kilby’s revolutionary idea was to make all the different components of a circuit out of the same flat block of semiconductor material. Not only would this get rid of wires and faulty connections, it would make the entire circuit much more compact. Kilby demonstrated his first “integrated circuit” on Sept. 12, 1958.

The phrase “better suited to” (second paragraph) means more able to meet the requirements of.

Jack Kilby’s revolutionary idea was to make all the different components of a circuit out of the same flat block of semiconductor material. Not only would this get rid of wires and faulty connections, it would make the entire circuit much more compact. Kilby demonstrated his first “integrated circuit” on Sept. 12, 1958.

According to the text, before the pocket calculator, calculators were compact, but did not run on batteries

In May 2021, a hole was found in a robotic arm aboard the International Space Station (ISS). The suspected culprit was a piece of rogue space junk. While thankfully no astronauts were injured, it has re-focussed attention on the growing problem of orbital debris.

The word “Yet” (third paragraph) acts as an indicator of time.

Jack Kilby’s revolutionary idea was to make all the different components of a circuit out of the same flat block of semiconductor material. Not only would this get rid of wires and faulty connections, it would make the entire circuit much more compact. Kilby demonstrated his first “integrated circuit” on Sept. 12, 1958.

In the third sentence of the fourth paragraph, the pronoun “it” refers to Intel.

In May 2021, a hole was found in a robotic arm aboard the International Space Station (ISS). The suspected culprit was a piece of rogue space junk. While thankfully no astronauts were injured, it has re-focussed attention on the growing problem of orbital debris.

How did we get here?

 It’s easy to forget that just seven decades ago the Moon was the only thing orbiting the Earth. On 1 January 2021 there were 6,542 satellites in orbit. Tellingly, only just over half of them were active. That’s a lot of useless metal careering around the planet at 28,000 kph — ten times faster than a bullet.

How bad is the problem?

 Very bad and getting worse. Estimates suggest there are currently half a million pieces of debris the size of a marble or larger and 100 million pieces of debris above one millimeter across. Yet only 27,000 pieces are actively tracked by the US Department of Defense.

What is Kessler syndrome?

 It’s a catastrophic chain of events in which a satellite is shattered by a piece of space junk (or a collision with another satellite) and the resulting debris destroys more satellites creating more junk and so on in a never-ending cascade. It’s a domino effect – one piece falls and then takes the rest with it – and is named after NASA scientist Donald Kessler, who outlined the dangers back in 1978.

What can we do about it?

 Better regulation of new launches would help, as right now it’s a bit of a free-for-all. There are existing regulations in place to try and mitigate the dangers, such as a 25-year de-orbit rule for missions in low-Earth orbit. However, ESA’s Space Debris Environment Report says that less than 60 per cent of those flying in low-Earth orbit currently stick to the rules.

Colin Stuart. Space Junk: Is it a disaster waiting to happen?
Internet: <www.sciencefocus.com> (adapted)

It can be concluded that in the beginning of the fourth paragraph, “It's” is the contracted form of it has

In May 2021, a hole was found in a robotic arm aboard the International Space Station (ISS). The suspected culprit was a piece of rogue space junk. While thankfully no astronauts were injured, it has re-focussed attention on the growing problem of orbital debris.

The event described in the first paragraph is an example of an effect whose risks were predicted decades ago