Questões - ESPCEX 2016 | Gabarito e resoluções

(EsPCEx - 2016) Considere as seguintes afirmativas: I. O poder de penetrao da radiao alfa () maior que o da radiao gama (). II. A perda de uma partcula beta () por um tomo ocasiona a formao de um tomo de nmero atmico maior. III. A emisso de radiao gama a partir do ncleo de um tomo no altera o nmero atmico e o nmero de massa deste tomo. IV. A desintegrao de88Ra226a83Bi214envolve a emisso consecutiva de trs partculas alfa () e duas betas (). Das afirmativas apresentadas esto corretas apenas:

(EsPCEx - 2016) Would it be wrong to eradicate mosquitoes? The mosquito is the most dangerous animal in the world, carrying diseases that kill one million people a year. Now the Zika virus, which is carried by mosquitoes, has been linked with thousands of babies born with brain defects in South America. There are known species of mosquitoes, but only the females from just of species draw blood from humans to help them develop their eggs. Of these, just half carry parasites that cause human diseases. More than a million people, mostly from poorer nations, die each year from mosquito-borne diseases, including Malaria, Dengue Fever and Yellow Fever. Some mosquitoes also carry the Zika virus, which was first thought to cause only mild fever and rashes. However, scientists are now worried that it can damage babies in the womb. Theres a constant effort to educate people to use nets and other tactics to avoid being bitten. But would it just be simpler to make an entire species of disease-carrying mosquito extinct? In Britain, scientists at Oxford University and the biotech firm Oxitec have genetically modified (GM) the males ofAedes aegypti a mosquito species that carries both the Zika and Dengue viruses. These GM males carry a gene that stops their offspring from developing properly. This second generation of mosquitoes then die before they can reproduce and become carriers of disease themselves. So are there any downsides to removing mosquitoes? Mosquitoes, which mostly feed on plant nectar, are important pollinators. They are also a food source for birds and bats while their young as larvae are consumed by fish and frogs. This could have an effect further ahead in the food chain. Mosquitoes also have limited the destructive impact of humanity on nature. Mosquitoes make tropical rainforests, for humans, virtually uninhabitable. Rainforests are home to a large share of our total plant and animal species, and nothing has done more to delay man-made destruction over the past years than the mosquito. Adapted from http://www.bbc.com/news/magazine-35408835 In the sentence ... a gene that stops their offspring from developing properly. (paragraph 3), the word offspring means

(EsPCEx - 2016) Would it be wrong to eradicate mosquitoes? The mosquito is the most dangerous animal in the world, carrying diseases that kill one million people a year. Now the Zika virus, which is carried by mosquitoes, has been linked with thousands of babies born with brain defects in South America. There are known species of mosquitoes, but only the females from just of species draw blood from humans to help them develop their eggs. Of these, just half carry parasites that cause human diseases. More than a million people, mostly from poorer nations, die each year from mosquito-borne diseases, including Malaria, Dengue Fever and Yellow Fever. Some mosquitoes also carry the Zika virus, which was first thought to cause only mild fever and rashes. However, scientists are now worried that it can damage babies in the womb. Theres a constant effort to educate people to use nets and other tactics to avoid being bitten. But would it just be simpler to make an entire species of disease-carrying mosquito extinct? In Britain, scientists at Oxford University and the biotech firm Oxitec have genetically modified (GM) the males ofAedes aegypti a mosquito species that carries both the Zika and Dengue viruses. These GM males carry a gene that stops their offspring from developing properly. This second generation of mosquitoes then die before they can reproduce and become carriers of disease themselves. So are there any downsides to removing mosquitoes? Mosquitoes, which mostly feed on plant nectar, are important pollinators. They are also a food source for birds and bats while their young as larvae are consumed by fish and frogs. This could have an effect further ahead in the food chain. Mosquitoes also have limited the destructive impact of humanity on nature. Mosquitoes make tropical rainforests, for humans, virtually uninhabitable. Rainforests are home to a large share of our total plant and animal species, and nothing has done more to delay man-made destruction over the past years than the mosquito. Adapted from http://www.bbc.com/news/magazine-35408835 In the sentence This could have an effect further ahead in the food chain. (paragraph 4), the word further expresses

(EsPCEx- 2016) Considere a reta t mediatriz do segmento cujos extremos so os pontos em que a reta s : 2x - 3y + 12 = 0intercepta os eixos coordenados. Ento, a distncia do ponto M(1, 1) reta t

(EsPCEx- 2016) No sculo XIX, uma corrente de filsofos acreditava ser possvel reformar o capitalismo por meio da ao do estado ou da associao dos trabalhadores em cooperativas autogeridas. Esses princpios so denominados

(EsPCEx - 2016) Compostos contendo enxofre esto presentes, em certo grau, em atmosferas naturais no poludas, cuja origem pode ser: decomposio de matria orgnica por bactrias, incndio de florestas, gases vulcnicos etc. No entanto, em ambientes urbanos e industriais, como resultado da atividade humana, as concentraes desses compostos so altas. Dentre os compostos de enxofre, o dixido de enxofreSO2 considerado o mais prejudicial sade, especialmente para pessoas com dificuldade respiratria. Adaptado de BROWN, T.L. et al, Qumica: a Cincia Central. 9 ed, Ed. Pearson, So Paulo, 2007. Em relao ao composto SO2e sua estrutura molecular, pode-se afirmar que se trata de um composto que apresenta Dado: nmero atmico S = 16 ; O = 8.

(EsPCEx - 2016) Em H tambm oque vai se entregar, ser um com o Arpoador, mil-partido. a palavra grifada,

(EsPCEx - 2016) Uma partcula de carga e massa foi colocada num ponto prximo superfcie da Terra onde existe um campo eltrico uniforme, vertical e ascendente de intensidade. Sabendo que a partcula est em equilbrio, considerando a intensidade da acelerao da gravidade o valor da carga e o seu sinal so respectivamente:

(EsPCEx - 2016) No que diz respeito ao Brasil e seu relacionamento com as instituies internacionais, correto afirmar que

(EsPCEx - 2016) Assinale a alternativa que contm, na sequncia em que aparecem, os adjetivos correspondentes aos seguintes seres: COBRE PELE BRAO BODE COBRA PRATA

(EsPCEx- 2016) Sejam z ev nmeros complexos onde |z| = 1 e v tem coordenadas no plano de Argand-Gauss . Sobre o nmero complexo zv (resultante da multiplicao dos complexos z e v), podemos afirmar que :

(EsPCEx - 2016) Ao responder pelo crime de __________, o acusado, surpreendido em __________, foi __________ em uma __________ que durou pouco mais de duas horas, aps as quais deixou __________ a sua __________ em todas as folhas do depoimento. As lacunas do perodo acima podem ser completadas, respectivamente, com

(EsPCEx- 2016) Os valores reais de npara os quais a reta (t) y = x + nseja tangente elipse de equao 2x2 + 3y2 = 6 so iguais a

(EsPCEx- 2016) O nmero realpertence ao conjunto

(EsPCEx - 2016) Assinale a alternativa cujo vocbulo s pode ser empregado com acento grfico.