Read the passage and answer :
Vehicular pollution causes serious health problems. Carbon monoxide, nitrogen oxides and hydrocarbons emitted by motor vehicles trigger off a complex chain reaction resulting in dangerous pollutants such as ozone, aldehydes and ketones. The prolonged inhalation of carbon monoxide present in the toxic fumes reduces the carbon carrying capacity of the blood, and may cause headache, sickness and even death. Likewise, unbumed fragments of hydrocarbons form smog thicken with elements that may cause cancer.

Read the following passage and answer the questions.
“I Have a Dream” is a public speech delivered by American civil rights activist Martin Luther King Jr. during the march on Washington for jobs and freedom on August 28, 1963, in which he calls for an end to racism in the United States and called for civil and economic rights. Delivered to over 2,50,000 civil rights supporters from the steps of the Lincoln Memorial in Washington, D.C., the speech was a defining moment of the civil rights movement. Beginning with a reference to the Emancipation Proclamation, which freed millions of slaves in 1863, King observes that: “one hundred years later, the Negro still is not free”. Towards the end of the speech, King departed from his prepared text for a partly improvised peroration on the theme “I have a dream”, prompted by Mahalia Jackson’s cry: “Tell them about the dream, Martin!” In this part of the speech, which most excited the listeners and has now become its most famous, King described his dreams of freedom and equality arising from a land of slavery and hatred. Jon Meacham writes that, “With a single phrase, Martin Luther King Jr. joined Jefferson and Lincoln in the ranks of men who’ve shaped modern America”. The speech was ranked the top American speech of the 20th century in a 1999 poll of scholars of public address.

Read the following passage and write in the brackets the letter of correct answer of the questions from the givén alternatives :
The average life span of humanity throughout all history was twenty seven years. In the 19th century, however, science and improved technology treble life expectancy. As technological capabilities improved and life expectancy increased, the number of babies per family went down, demonstrating the fact that nature keeps on balancing the population figure. After major wars, when large number of young and healthy men are Killed, baby-making increases. The birth-rate continues to rise for five years or so after wars end, until the score is rectified. All this happens without conscious cooperation or even the knowledge of the humans concerned. When the probabilities of human survival are poor, nature makes many babies. When the chances of mans survival improve, nature reduces the number of new babies.

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