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Science & Technology

923 questions asked in UPSC Prelims.

2010 · Q108Science & TechnologyPhysicsmoderate

Indiscriminate disposal of used fluorescent electric lamps causes mercury pollution in the environment. Why is mercury used in the manufacture of these lamps?

  1. (a)A mercury coating on the inside of the lamp makes the light bright white
  2. (b)When the lamp is switched on, the mercury in the lamp causes the emission of ultra-violet radiations
  3. (c)When the lamp is switched on, it is the mercury which converts the ultra-violet energy into visible light
  4. (d)None of the statement given above is correct about the use of mercury in the manufacture of fluorescent lamps
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Official answer(b) When the lamp is switched on, the mercury in the lamp causes the emission of ultra-violet radiations

2010 · Q126Science & TechnologyHealth & Diseaseseasy

Excessive release of the pollutant carbon monoxide (CO) into the air may produce a condition in which oxygen supply in the human body decreases. What causes this condition ?

  1. (a)When inhaled into the human body, CO is converted into CO₂
  2. (b)The inhaled CO has much higher affinity for haemoglobin as compared to oxygen
  3. (c)The inhaled CO destroys the chemical structure of haemoglobin
  4. (d)The inhaled CO adversely affects the respiratory centre in the brain
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Official answer(b) The inhaled CO has much higher affinity for haemoglobin as compared to oxygen

2010 · Q127Science & TechnologyHealth & Diseasesmoderate

Consider the following statements: 1. Every individual in the population is equally susceptible host for Swine Flu. 2. Antibiotics have no role in the primary treatment of Swine Flu. 3. To prevent the future spread of Swine Flu in the epidemic area, the swine (pigs) must all be culled. Which of the statements given above is/are correct ?

  1. (a)1 and 2 only
  2. (b)2 only
  3. (c)2 and 3 only
  4. (d)1, 2 and 3
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Official answer(a) 1 and 2 only

2010 · Q128Science & TechnologyHealth & Diseasesmoderate

With regard to the transmission of the Human Immunodeficiency Virus, which one of the following statements is not correct ?

  1. (a)The chances of transmission from female to male are twice as likely as from male to female
  2. (b)The chances of transmission are more if a person suffers from other sexually transmitted infections
  3. (c)An infected mother can transmit the infection to her baby during pregnancy, at childbirth and by breast feeding
  4. (d)The risk of contracting infection from transfusion of infected blood is much higher than an exposure to contaminated needle
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Official answer(a) The chances of transmission from female to male are twice as likely as from male to female

2009 · Q69Science & TechnologyBiotechnology & Geneticsmoderate

In the context of genetic disorders, consider the following: A woman suffers from colour blindness while her husband does not suffer from it. They have a son and a daughter. In this context, which one of the following statements is most probably correct ?

  1. (a)Both children suffer from colour blindness
  2. (b)Daughter suffers from colour blindness while son does not suffer from it
  3. (c)Both children do not suffer from colour blindness
  4. (d)Son suffers from colour blindness while daughter does not suffer from it
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Official answer(d) Son suffers from colour blindness while daughter does not suffer from it