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Duration: 2 ½ hours
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Class: 10
SCIENCE
Max. Marks: 75
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Note : (i) Answer all the questions. (ii) Choose the correct answer from the four alternatives given in the brackets. 15X1=15 1. The correct statement about Neanderthal man is a) the first human like hominid b)started agriculture c) ate meat and walked erectly d)buried the dead 2. A child eats food rich in carbohydrates and avoids protein in its diet. Which type of nutritional deficiency will affect that child? a) Kwashiorkar b)Nyctalopia c)Diabetes d) Down syndrome 3. In which sub-division of prophase-I undergo crossing over. a) leptotene b) pachytene c) zygotene d) diplotene 4. The endocrine gland related to the immune system is a) Thyroid b) thymus c) adrenal d) pineal 5. Which blood cells of mammals are concerned with immunity? a) young Erythrocyte b) Leucocyte c) Thrombocyte d) Matured Erythrocyte 6. ___________ of green plants are called factories of food production. a) Mitochondria b) Chloroplasts c) Endoplasmic reticulum d)Nucleus 7. ---------------- is a first National Park in India. a) Bandhipur National Park c) Corbett National Park b) Sunderbans National Park d) Kanha National Park 8. An example of water bone disease is a) scabies b) dracunculiasis c) trachoma d) typhoid 9. Soil cannot store more nitrogen than it can hold. Hence soil is said to be in a state of a) saturation b) unsaturation c) super saturation d) under saturation H 10. The p of a solution containing hydrogen ion concentration of 0.001M solution is a) 3 b) 14 c) 7 d) 11 11. An element which is an essential constituent of all organic compounds belongs to the a) 15th group b) 13th group c) 14th group d) 6th group 12. A good conductor among the allotropes of carbon is a) coal b) graphite c) diamond d) lignite 13. Assertion (A): Massive objects offer lesser inertia. Reason (R): Inertia of an object is measured by its weight. a) Both (A) and (R) are correct and (R) explains (A) b) Both (A) and (R) are correct yet (R) does not explain (A) c) (A) is correct but (R) is not. d) Both (A) and (R) are incorrect. 14. Statement 1: It is a vector quantity Statement 2: It is a scalar quantity Statement 3: It has both magnitude and direction http://doozystudy.blogspot.in/
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Which of the above statements is true with respect to momentum? a) 2 and 3 only b) 1 only c) 1 and 3 only d) 3 only 15. During dispersion, red light bends the ______ and violet light bends the _____. (least/ most)
List II (Symptoms) i) Chills and high fever recurring for 3 to 4 days ii) Patches on skin and nails with itching sensation iii) Abdominal pain with blood and mucus in stools. iv) Persistant cough and loss of body weight.
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List I (Disease) A) Amoebiasis B) Tuberculosis C) Ringworm D) Malaria
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SECTION –II Note: Answer any twenty questions. 20X2=20 16. The excessive use of pesticides has only resulted in the occurrence of more resistant varieties of pests rather than their complete eradication. How can you link this with Darwin’s theory of Natural Selection and Evolution? 17. Match the scientists (A) with their work (B) (A) Scientists (B) Work 1. Gregor Johann Mendel Organic evolution 2. Charles Darwin Vaccine 3. Jean Baptiste Lamarck Father of genetics 4. Edward Jenner Evolution 18. Match:
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19. Malarial fever is not caused in a person immediately after introducing the sporozoites by an infected anopheles mosquito. Why? 20. Signify meiosis with two supporting points. 21. What is vegetative propagation? Mention the vegetative propagates in: i) Bryophyllum ii)Spirogyra 22. Observe the following flow-chart depicting blood-circulation in mammals. Body parts
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A
P
D D
A
D R Heart
B
C
Q
S Lungs
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Pick out the correct blood vessels A,B,C,D from the following : i)Pulmonary veins ii) Venacava iii) Pulmonary artery iv) Aorta Among the P,Q,R and S samples, identify the correct match from the following a) P&Q = Oxygenated and R&S = Deoxygenated c) All are Oxygenated b) P&Q =Deoxygenated and R&S =Oxygenated d) All are Deoxygenated 23. Name the protein and the blood cells responsible for the clotting of blood. 24. It is an illustration of excretory system. O
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i) What is O, P and Q. ii) Write the function of Q. 25. (i) In a healthy adult, The initial filtrate in the kidneys is ________. (ii) For engulfing food, amoeba: pseudopodia, then paramoecium: ________. 26. Assertion: (A) The roots of very huge trees grow towards the availability of water source. Reason : (B) The roots of coconut tree are not seen far away from the plant in want of water. a) A is right B is wrong b) A is wrong B is right c) B explains A d) B does not explains A 27. A fish taken out of water cannot survive for a long time. Why? 28. Observe the following food web: J
I
H E A
B
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C
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Find out the wrong statement: a) ‘A’ is a producer b) ‘F’ is a herbivore c) ‘H’ is an omnivore d) ‘I’ is a climax carnivore ii) Find out how many food chains are present in the above food web. 29. Give two examples for each of the following , i) Water washed Diseases ii) Water related Diseases 30. Hydrogen has the highest mass energy content – justify. 31. Read the sentences and correct them. i) A natural resources is a non-renewable resource, if it cannot be generated again. ii) Hydrogen, Wind and Hydro electricity are non-renewable resources.
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i)
F
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32. Give the dispersed phase and the dispersion medium in each of the following a. cheese b. soda water c. smoke 33. In the below case, Sekar observed that the water turned sweeter after sometime. Explain the reason for the same. Porous pot
Water Glass beaker
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Sugar solution
Steel Wrought iron Pig iron 38. Fill in:
Percentage of carbon 2– 4.5% 0.25% < 0.25%
Uses
Making man – hole covers and drain pipes Construction of buildings and machinery Making electromagnets
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Type of Iron
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34. Calculate the number of water molecules present in one drop of water which weighs 0.18g. 35. Sodium hydroxide and Hydrochloric acid react as shown in this equation. NaOH + HCl NaCl + H2O (aq) (aq) (aq) (I) i) What type of chemical reaction is this? ii) What happens to the temperature of the solution as the chemicals react? 36. What is redox reaction? Write a chemical equation. 37. Match the following:
Zone Combustion Zone
Temperature
Chemical Process CaCO3 CaO + CO2 CaO + SiO2 CaSiO3
4000C
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39. Write down the possible isomers and give their IUPAC names using the formula C 4H10. 40. An object of mass 1k.g is dropped from a height of 20 m. It hits the ground and rebounds with the same speed. Find the change in momentum. (Take g=10 m/s2) 41. If the density of the earth is doubled to that of its original value. The radius remaining the same, what will be the change in acceleration due to gravity? 42. Draw the schematic diagram of an electric circuit consisting of a battery of two cells of 1.5V each, three resistance of 5 ohm, 10 ohm and 15 ohm respectively and a plug key all connected in series. 43. What are the limitations in harnessing wind energy? 44. Which form of energy leads to the least amount of environmental pollution in the process of harnessing and utilization? Justify your answer.
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45. A concave lens has focal length of 15 cm. At what distance should the object from the lens be placed so that it forms an image 10 cm from the lens? 46. Light which is incident on a flat surface makes an angle of 150 with the surface.
SECTION-III
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i) What is the angle of incidence? ii) What is the angle of reflection? iii) Find the angle of deviation? 47. Light travels at 1.90 X 108 m/s in a crystal, what is the crystal’s index of refraction?
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Note: i) Answer any four questions by choosing one question from each part. ii) Each question carries five marks. iii) Draw diagrams wherever necessary. 4x5 = 20 Part - I 48. List out various diseases caused due to nutritional deficiency. Add notes on their symptoms. 49. Observe and copy the diagram of the human brain and identify & label the areas mentioned:
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i) The area responsible for consciousness, intelligence, memory, imagination and reading. ii) The area responsible for regulation and co-ordination of group movements of voluntary muscles. iii) The area responsible for sleeping and respiration. iv)The area responsible for reflexes involved in the regulation of heart beat, blood vessel contraction, breathing etc. v) The right and left cerebral hemispheres united at this nervous tissue. Part-II
50. Describe the structure of a dicot seed. 51. List out the harmful effects of coal burning.
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Part-III
Mr. Barani Dharan, MSc, BEd, PGDM, PGDCA,
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8/15, Nainampatty, Attayampatty post, Salem 637501 Mobile: 9894596978
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Please send your answer scripts to this address:
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52. Find how many moles of atoms are there in : i) 2 g of N ii) 46 g of Na iii) 20 g of Ca iv) 1.4 g of Li v) 64 g of S 53. Write a balanced equation using the correct symbols for these chemical reactions. i) Action of hydrogen on ethene in the pressure of Ni catalyst. ii)Combustion of methane. iii) Dehydrogenation of ethanol. iv) Decarboxylation of sodium salt of ethanoic acid. Part- IV 54. Write short notes on space station. Explain its uses and limitations. 55. An object of 5cm tall is placed at a distance of 10cm from a concave mirror of radius of curvature 30cm. i) Find the nature, position and size of the image. ii) Draw the ray diagram to represent the above case.
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