ARMY PUBLIC SCHOOL,JAK RRC.JABALPUR

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1 ARMY PUBLIC SCHOOL,JAK RRC.JABALPUR Important Question for Class X Science( ) 1. List any two factors on which resistance of a conductor depends. 2. Mention one reason why tungsten is used for making filament of electric lamp. 3. A piece of wire is redrawn,without change in volume so that its radius is halved.compare the new resistance with the original resistance. 4.State the direction of magnetic field in the following case: Force on the conductor Current 5. Explain the function of an earth wire. Why is it necessary to earth metallic appliances? 6. Under what condition does a current carrying conductor kept in a magnetic magnetic field experience maximum force? On what other factors does the magnitude of this force depend? Name and state the rule used for determination of direction of this force. 7. An electric oven of 1.5 kw is operated in a domestic circuit (220 V) that has a current rating of 5A.What result do you expect in this case? Explain. 8. Explain the underlying principle and working of an electric generator with a suitable well labeled diagram. What is the function of brushes. 9. Draw a ray diagram to show the formation of image of an object placed between infinity and the optical centre of a concave lens. 10. A concave lens of focal length 15 cm forms an image 10 cm from the lens. Calculate : a) the distance of the object from the lens. b) the magnification for the image formed. c) the nature of the image formed. 11. An optical device has been given to a student and he determines its focal length by focusing the image of the sun on a screen placed 24 cm from the device on the same side of the sun. a) Name the optical device and b) Find its focal length. 12. Draw a neat diagram of the human eye and label it properly.mention the function of any three parts. 13. Refractive index of diamond with respect to glass is 1.6 and absolute refractive index of glass is 1.5.Find the absolute refractive index of diamond. 14..Biomass and hydropower plant are both renewable and conventional source of energy. State the advantages of generating energy from them. 15. One half of a convex lens of focal length 10 cm is covered with a black paper. Can such a lens produce an image of a complete object placed at a distance of 30 cmfrom the lens? Draw a ray diagram to justify your answer. 16. What is advance sunrise and delayed sunset. Explain it. 17. Explain the refraction through a glass prism with the help of a ray diagram. 18.Why do herbivores have longer small intestine than carnivores?

2 19. The pharynx leads to trachea as well as to the oesophagus. The two openings lie very close to each other. Yet the food we swallow does not normally go to trachea. Why? 20. Why are electrochemical signals not an efficient means of communication in plants? 21. Why Mimosa pudica leaves dropped down when touched? 22. Pancreas and gonads perform dual functions. Give reasons to justify the statement. 23. The first trophic level in a food chain is always a green plant. Why? 24.Give reason to justify the following: a) The existence of decomposers is essential in a biosphere. b) Flow of energy in food chain is unidirectional. 25. List two functions performed by testes in human beings. 26. What are those organisms called which bear both the sex organs in the same individual? Give one example of such organism. 27. Explain the importance of fossils in deciding evolutionary relationships. 28.What are the three key factors of the modern concept of evolution? 29.What is Archaeopteryx? What is its significance in evolution? 30. In a neuron: a) Where is information received? b) Wave of electrical disturbance that sweeps over the nerve cell? c) Through which part does the information travel? d) Where does the impulse get converted into a chemical signal for outward transmission? 31. What are stamen and carpel in a flower? What is the name of yellow powdery substance present in the anther of a flower? 32. Gene control traits. Explain this with an example. 33. Outline a project which aims to find the dominant coat colour in dogs. 34. The genotype of green-stemmed tomato plants is denoted by GG and that of purple stemmed tomato plants as gg. When these two plants are crossed: a) What colour of stem would you expect in their F 1 progeny? b) Give the % of purple stemmed plant if F 1 plants are self-pollinated? c) In what ratio would you find the green and purple colour in F 1 progeny? 35. Write the chemical equations to show what happens when 1. An ester react with a base? 2. methane is reacted with chlorine in the presence of sunlight? 3. ethanol reacts with ethoniac acid in the presence of H 2 SO How does the valency of elements vary 1.In going down a group and 2.In going fromfrom left to right in a period of the periodic table. 37..Given below are some elements of the modern periodic table. Atomic number of the element is given as A(4), B (9), C(14), D(19), E(20). 1.select the element that has one electron in the outermost shell.also write the electronic of this element configuration of this element. 2. Which two elements amongst these belongs to the same group? Give reason for your answer.

3 38. Which two elements amongst these belong to the same period? Which one of the two has bigger atomic radius? 39. Study the following table in which position of 6 elements A,B,C,D,E and F are shown as they are in the modern periodic table. Group/period A B C 3 D E F ON the basis of the above table,answer the following questions: 1. Name the elements which will form only covalent compound. 2. Which element is a metal with valency are. 3. Which element is a non-metal with valency two? 4. Out of D and E, which has a bigger atomic radius and why? 5. Write the formula of the compound formed when B combines with D. 40. Anelement is placed in 2 nd group and 3 rd period of the periodic table burns in the presence of oxygen to form a basic oxide. 1.Identify the element 2. Write the electronic configuration. 3. Write the balanced equation when it burns in the presence of air. 4. Write a balanced equation when this oxide is dissolved in water. 5. Draw the electron dot structure for the formation of this oxide. 41. On heating blue coloured powder of copper (II) nitrate in boiling tube, copper oxide (black),oxygen gas and a brown gas X is formed. 1. Write a balanced chemical equation of the reaction. 2. Identify the brown gas X evolved. 3. Identify the type of reaction. 4. What could be the ph range of aqueous solution of the gas X? 42..Identify the type of reaction from the following equation 1.CH 4 +2O CO 2 +2 H 2 O 2. Pb(NO 3 ) 2 +2KI PbI 2 + 2KNO 3 3. CuSO 4 +Zn ZnSO 4 +Cu sunlight 4. 2AgCl Ag +Cl Name the products formed in each case when 1. Hydrochloric acid reacts with caustic soda. 2. Granulated Zinc reacts with caustic soda. 3. Carbon dioxide is passed into lime water. 44.A dry pellet of a common base B,when kept in open absorbs moisture and turns sticky.the compound is also a by-product of chloro-alkali process.identify B what type of reaction occure when B is treated with an acidic oxide? Write a balanced chemical equation for one such solution Write the electron dot structure fo potassium and chlorine. 2. Show the formation of KCl by transfer of electron. 3. Name the ions present in this compound KCl An ore on treatment with dilute HCl brisk effewescense what step will be required to obtaian metal from the enriched Ore.

4 2.Copper coin is kept immererd in AgNO 3 soloution for same time. What change will take place in coin and colour of the soloution? write balanced chemical equator of the reaction involved. 47. Write IUPAC name of : 1.CH 3 - CH 2 - CH=CH 2 2.CH 3 CHO 3.CH 3 CO CH 2 CH 3 4.CH 3 CHOH CH 3 OH 5.HCOOH 48. What are isomers? Why can t we have isomers of first three members of alkene series? Draw the possible structure of isomers of butane (C 4 H 10 ). 49. A carboxylic acid C 2 H 4 O 2 reacts with an alcohol in the presence of H 2 SO 4 to form a compound X.The alcohol an oxidation with alkaline KMnO 4 followed by acidification give the same carboxylic acid. C 2 H 4 O 2. Write the name and structur of 1. Carboxylic acid 2. Alcohol 3. Compound X 50.What happens when : 1.Ethanol is burnt in air. 2. Ethanol is heated with excess conc H 2 SO 4 at 993 K.

5 IX physics 1. What is uniform motion? 1 2. Write the S.I unit of acceleration D T What does the above graph represents about motion of body. 4. The average speed of a person in driving to school is 30kmph. On the return trip along the same route, the average speed is 25kmph. What is the average speed for the round trip to the school Derive second equation of motion using velocity-time graph. 3 1

Sub- Science (Physics and Chemistry ) Important questions for board purpose

Class -10 Sub- Science (Physics and Chemistry ) Important questions for board purpose Note: Students are requested to solve these questions in separate notebook/a-4 sheets. 1. Burning of fossil fuels result