UPSC civil service question paper 2010 subject wise SCIENCE

7 UPSC 2010 PHYSICS 88. What is the principle by which a cooling system (Radiator) in a motor car works? (a) Conduction only (b) Convection (c) Radiation only (d) Both conduction and radiation CHEMISTRY 6. 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? (a) When inhaled into the human body, CO is converted into CO2 (b) The inhaled CO has much higher affinity for Haemoglobin as compared to oxygen (c) The inhaled CO destroys the chemical structure of Haemoglobin (d) The inhaled CO adversely affects the respiratory centre in the brain. 96. Hydrogen fuel cell vehicles produce one of the following as “exhaust”? (a) NH3 (b) CH4 (c) H2O (d) H2O2 98. Consider the following: 1. Oxides of Hydrogen 2. Oxides of Nitrogen 3. Oxides of Sulphur Which of the above causes/cause acid rain? (a) 1 and 2 only (b) 3 only (c) 2 and 3 only (d) 1, 2 and 3 131. Chlorination is a process used for water purification. The disinfecting action of chlorine is mainly due to (a) The formation of hydrochloric acid when chlorine is added to water. (b) The formation of hypochlorous acid when chlorine is added to water. (c) The formation of nascent oxygen when chlorine is added to water. (d) The formation of hydrogen when chlorine is added to water. BOTANY 45. Consider the following statements: 1. The taxus tree naturally found in the Himalayas 2. The taxus tree is listed in the red data book. 3. A drug called “taxol” is obtained from taxus tree is effective against parkinson‟s disease. Which of the statements given above is/are correct (a) 1 only (b) 1 and 2 only (c) 2 and 3 only (d) 1, 2 and 3 65. Some species of plants are insectivorous why? (a) Their growth in shady and dark places does not allow them to undertake sufficient photosynthesis and thus they depend on insects for nutrition (b) They are adapted to grow in nitrogen deficient soils and thus depend on insects for sufficient nitrogenous nutrition (c) The cannot synthesize certain vitamins themselves and depend on the insects digested by them (d) They have remained in that particular stage of evolution as living fossils, a link between autograph and heterotrophs 120. Other than Jatropha curcas, why is pongamia pinnata also considered a good option for the production of bio-diesel in India? 1. Pongamia pinnata grows naturally in most of the arid regions of India. 2. The seeds of Pongamia pinnata are rich in lipid content of which nrarly half is oleic acid. Which of the statements given above is/are correct? (a) 1 only (b) 2 only \ (c) Both 1 and 2 (d) Neither 1 nor 2 122. If a potato is placed on a pure paper plate which is white and unprinted and put in a microwave oven, the potato heats up but the paper plate does not. This is because (a) Potato is mainly made up of starch whereas paper is mainly made up of cellulose. b) Potato transmits microwaves whereas paper reflects microwaves (c) Potato contains water whereas paper does not contain water (d) Potato is a fresh organic material whereas paper is a dead organic material. 128. Genetically modified “golden rice” has been engineered to meet human nutritional requirements. Which one of the following statements best qualifies golden rice? (a) The grains have been fortified with genes to provide three times higher grain yield per acre than other high yielding varieties. (b) Its grains contain pro-vitamin A which upon ingestion is converted to vitamin A in the human body. (c) Its modified genes cause the synthesis of all the nine essential amino acids. (d) Its modified genes cause the ZOOLOGY 3. Which one of the following processes in the bodies of living organisms is a digestive process? (a) Breakdown of proteins into amino acids (b) Breakdown of glucose into CO2 and H2O (c) Conversion of glucose into glycogen (d) Conversion of amino acids into proteins 4. From the point of view of evolution of living organisms, which one of the following is the correct sequence of evolution? (a) Otter-Tortoise-Shark (b) Shark-Tortoise-Otter (c) Tortoise-Shark-Otter (d) Shark-Otter-Tortoise 5. Consider the following statements: 1. Hepatitis B is several times more infectious than HIV/AIDS 2. Hepatitis B can cause liver cancer Which of the statements given above is/are correct? (a) 1 only (b) 2 only (c) Both 1 and 2 (d) neither 1 nor 2 7. 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 statement given above is/are correct ? (a) 1 and 2 only (b) 2 only (c) 2 and 3 only `(d) 1, 2 and 3 8. With regard to the transmission of the Human Immunodeficiency virus, which one of the following statements is not correct? (a) The chances of transmission from female to male are twice as likely as from male to female (b) The chances of transmission are more if a person suffers from other sexually transmitted infections (c) An infected mother can transmit the infection to her baby during pregnancy, at childbirth and by breast feeding (d) The risk of contracting infection from transfusion of infected blood is much higher than an exposure to contaminated needle. 43. King cobra is the only snake that makes its own nest. Why-does it make its nest? (a) It is a snake-eater and the nest helps attract other snakes (b) It is a viviparous snake and needs a nest to give birth to its offspring (c) It is an oviparous snake and lays its eggs in the nest and guards the nest until they are hatched (d) It is a large, cold blooded animal and needs a nest to hibernate in the cold season 90. With reference to the treatment of cancerous Tumours, a tool called Cyberknife has been making the news, in this context, which one of the following statements is not correct? (a) It is a robotic image guided system (b) It delivers an extremely precise dose of radiation (c) It has the capability of achieving sub-millimetre accuracy (d) It can map the spread of tumour in the body 117. Which bacterial strain, developed from natural isolates by genetic mainpualtions, can be used for treating oil spills? (a) Agrobacterium (b) Clostridium (c) Nitrosomonas (d) Pseudomonas 118. Which feature of some species of blue green algae helps promote them as bio-fertilizers? (a) They convert atmospheric methane into ammonia which the crop plants can absorb readily (b) They induce the crop plants to produce the enzymes which help convert atmospheric nitrogen to nitrates. (c) They have the mechanism to convert atmospheric nitrogen into a form that the crop plants can absorb readily (d) They induce the roots of the crop plants to absorb the soil nitrates in larger quantities. 141. Widespread resistance of malarial parasite to drugs like chloroquine has prompted attempts to develop malarial vaccine to combat malaria. Why is it difficult to develop an effective malaria vaccine? (a) Malaria is caused by several species of Plasmodium (b) Man does not develop immunity to malaria during natural infection (c) Vaccines can be developed only against bacteria. (d) Man is only an intermediate host and not the definitive host.