IMPORTANT QUESTIONS TENTH CLASS (TELANGANA)

Transcription

1 TENTH CLASS (TELANGANA) 4 Marks Questions IMPORTANT QUESTIONS PHYSICAL SCIENCE 1. Write an experimental method in measure the distances of object and image using concave mirror and write the table for observations? 2. Explain where do we use the convex and concave mirrors in our daily life situations. 3. Write the rules for image training formed by a concave mirror with the help of ray diagrams? 4. Explain the nature of images formed with the help of ray diagrams, when an object is placed at different points before a concave mirror. 5. Which mirror should be used so as to get real as well as inverted images? Mention the differences between the images. 6. There is an object in front of convex mirror at a distance of 5 cm. If its focal length is 10 cm. Then a) What is the image distance? b) What is its magnification? 7. Balance the following chemical equations by mentioning their physical states. i) CO 2 + H 2 O C 6 H 12 O 6 +O 2 ii) Fe 2 O 3 + CO Fe + CO 2 iii) NaCl +H 2 O NaOH + Cl 2 + H 2 iv) Na + H 2 O NaOH + H 2 8. How many types of images forms due to lenses? What are those? Mention the differences between them. 9. Compare and contrast the convex lens and concave lens. 10. How do you verify experimentally that, the focal length of a convex lens in increased when it is kept in water? 11. Describe the image formation by a convex lens for various positions of the object. 12. List out the apparatus required to find the focal length of a convex lens and describe the procedure to find the focal length. 13. The radius of curvature of two faces of a double convex lens are 10 cm, 15 cm and its focal length is 12 cm. Then determine the refractive index of the lens. 14. List out the apparatus required to find the refractive index of a prism experimentally. Explain the procedure with the help of a rough diagram. 15. Write the common defects of vision and explain with diagrams? How can you correct these visual defects by using lens? 16. Suggest an experiment to produce a rainbow in your classroom and explain the procedure. 17. List out the materials used in an experiment to prove when acid reacts with metal evolves hydrogen gas. Describe the experimental process. ONLINE-18

2 18. Write down the process and materials used in the experiment of the reaction of carbonates and metal hydrogen carbonates with acids produces corresponding salt, carbon dioxide gas and water? 19. Describe an experimental procedure with the help of a diagram to show that ''every compound which has hydrogen is not an acid". 20. Acids produce ions only in aqueous solution. How can you justify your answer with an experiment? 21. Explain a test to know whether the acid (or base) is strong or weak. 22. Distinguish between acids and bases. 23. Write the postulates of Bohr's Atomic model and mention its limitations. 24. Explain how does the quantum numbers be useful to understand atomic structure. 25. Explain the principles used to explain the electronic configuration with one example each. 26. Draw the shapes of s and p orbitals? 27. What are salient features of modern periodic table? 28. How to atomic radius, Ionization energy, Electron affinity, Electro negativity, Metallic and Non Metallic properties vary in a period and in a group? 29. Mention and explain the factors of influencing ionization energy? 30. Explain the formation of oxygen and nitrogen molecules according to valency bond theory. 31. List out the apparatus required to verify that V I is constant for a conductor. Explain the experiment with the help of a diagram. 32. Why does the electrical appliances damages due to overload? How can we prevent the damages due to overload? 33. Explain the effects of electric shock on human body. 34. Which device converts mechanical energy into electrical energy? Draw the figure showing the device. Explain the working of the device. 35. Which device converts electrical energy into mechanical energy? Where do we use the device in our daily life? 36. What are the different stages of extraction of metal from an ore? Write a note on any one of the stages. 37. Draw the diagram showing i) Froth flotation ii) Magnetic separation. 38. Explain sp 2 hybridization with one example? 39. Explain some important reactions with examples that takes place in carbon compounds. 40. Instead of using just plain water to clean clothes, why do we use detergents. How does it remove dirt from clothes? Explain.

3 2 Marks Questions 1. What are the consequences occur when the spherical mirrors were not known to human beings? 2. Draw the ray diagram for the formation of a virtual image using a concave mirror. 3. P Complete the following ray diagram and identify the position of the image. 4. Can a convex mirror burn a paper? Why? 5. Why do we prefer a convex mirror as a rear view mirror in the vehicles? 6. Why the spherical mirrors are used in solar cookers and car head lights? 7. An object is placed at a distance of 20 cm from a convex mirror of focal length 30 cm, then find the position and nature of the image? 8. A concave mirror produces 4 times magnified real image of an object placed at 10 cm in front of it. Where is the image located? 9. Write the uses of a spherical mirrors in our daily life. 10. Balance the following equations. i) BaCl 2 + H 2 SO 4 BaSO 4 + HCl ii) Cu 2 S + O 2 Cu 2 O+ SO Complete and balance the following equations. i) C 3 H 8 + O ii) Na + H 2 O Give some examples to chemical changes occurring in our daily life. 13. Observe the following equations and answer the questions given below. a) Zn + HCl ZnCl 2 + H 2 b) AgNO 3 + NaCl AgCl + NaNO 3 i) Mention the products in equation 'a' ii) Which is the precipitate in equation 'b' 14. Balance the following chemical equations including the physical states. i) CaCO 3 + HCl CaCl 2 + H 2 O + CO 2 ii) Fe 2 O 3 + Al Fe + Al 2 O Write chemical formulae of the following salts. a) Potassium Sulphate F C Object b) Aluminium Sulphate

4 16. Identify the salts having same positive or negative radicals belonging to a family NaCl, NaSO 4, KCl, K 2 SO Give example for acidic, basic and neutral salts. 18. What are the uses of bleaching powder. 19. What are the uses of Baking soda. 20. What are the uses of (Na 2 CO 3 ) washing soda. 21. Write the uses of NaOH. 22. How do you test your soil? 23. How many water molecules are there in the salts containing crystallization of water given below? i) Gypsum ii) Washing soda iii) Copper sulphate iv) Epsom salt 24. Write an experiment to find the change of colour in the reaction of an acid with a base (Neutralization) reaction. 25. Draw a ray diagram shows a point sized image with convex lens. 26. Draw a ray diagram shows an virtual image of a convex lens. 27. F 2 F1 Complete the ray diagram to show the path of the ray after refraction through the lens shown in the figure. 28. Draw any two ray diagrams shows real images of convex lens. 29. Draw the figures illustrating the behaviour of rays passing parallel to the principal axis of a concave lens. 30. Draw a ray diagram to illustrate the behaviour of a parallel beam of rays incident on convex lens making some angle with principle axis. 31. If the focal length of a glass lens is 0.25 m. Then find its power? 32. Complete the following ray diagram and mark i 1, i 2 and d. A B 33. Write the differences between "Myopia" and "Hypermetropia" 34. Why the danger signals are in red colour? 35. Sea appears blue in colour. Guess the reason for it. 36. Doctor advised to use a 2D lens. Then what is the focal length of that lens?

5 37. An old man was unable to see both nearer as well as far off objects clearly. Then i) What was the defect of the old man? ii) Which lens can be used for clear vision of nearer and far off objects? 38. The power of lens is +1.5D, what kind of lens it is? and what is its focal length? 39. What are four quantum numbers for the differentiating electron of Aluminium? 40. Imagine why 4s orbital of calcium filled before 3d orbital 41. Explain paulis exclusion principle by constructing a table for lithium element. 42. Draw Bohr Sommerfeld model of an atom when n = Draw the figure showing the increasing values of (n + l). 44. Which rule is violated in the electronic configuration 1s 2 2s 2 2p 6 3s 2 3p 6 4s 0 3d 1 and how? 45. State Hund's rule and explain with one example. 46. Write down the characteristics of the elements having atomic number 12. a) Period number b) Group number c) Valency d) Element family 47. State whether the following elements belong to a Group (G), Period (P) or neither Group nor Period (N) Elements O, S, Cl Li, Na, K K, Ca, Sc B, Al, Ga G/P/N 48. What are the limitations of mendeleev's periodic table? 49. How the metallic and non metallic nature of elements vary in a group and a period? 50. Explain the screening (shielding) effects How does it influence ionisation energy? 51. Write the electron dot structures for the following molecules. i) F 2 ii) HCl 52. What type of bonds are present in water molecule? Draw the electron dot structure of water. 53. What type of bonds are present in the following molecules? Draw their electronic structure. i) O 2 ii) CH Draw the lewis dot structures of B, C, N and O atoms. 55. Draw the lewis dot structures of valence electrons in He, Ne, Ar, Kr atoms. 56. Draw the figures of BF 3, H 2 O molecules based on Hybridisation. 57. Draw the figure showing the formation of N 2 molecule based on valence bond theory. 58. Draw the picture which shows the connections of electrical appliances in your home. 59. In house hold circuits, why do we use fuses? 60. Why doesn't a bird get a shock when it stands on a high voltage wire? 61. Draw the symbols of the following i) Battery ii) Resistance iii) Ammeter iv) Key

6 62. Find the value of 'X' in the following figure. I 1 = 2A 63. Find the resultant potential difference from the given figure based on Loops law. R 3 I A D V 1 I 2 = 5A - + I 3 = 1.5A I 4 = XA I I - + B C R 1 V What is the total quantity of charge flows in 5 minutes when a current of 2 amperes exist in a conductor? 65. Calculate the equivalent resistance of two resistors of 1 Ω and 10 Ω connected in parallel. 66. Find the resultant resistance in the circuit between A and B from the below diagram. 3 Ω 67. Why the materials like nichrome, manganin are uses in iron box and toaster? 68. In our houses the electric appliances are connected in parallel but not in series give reasons. 69. What is the material used for manufacturing a filament in the bulb. Why that material is used? 70. Draw the diagram of magnetic filed lines. 71. Draw the magnetic filed due to solenoid. 72. Find the length of the conductor which is moving with a speed of 10 m/s in the direction perpendicular to the direction of magnetic filed of induction 0.5T, if it induces an emf of 5V between the ends of the conductor. 73. How the tape of a tape recorder reproduces voice? 74. Explain the working of induction stove. 75. Explain the auto (self) reduction of sulphide ores. 76. Suggest some methods to prevent corrosion of metals. 2 Ω A 6 Ω R 2 B

7 77. Which reaction is useful to join broken railings of railway tracks and cracked machine parts? Explain that reactions. 78. Classify the following compounds as alkanes, alkenes and alkynes C 2 H 2, C 2 H 4, C 2 H 6, C 3 H 6, C 3 H 4, C 3 H Draw the figure of methane molecule showing its hybrid orbitals. 80. Write the structural formulae for the following compounds. i) 3 chloro 2 methyl pentane ii) 1, 3 hexa dien 5 yne 81. Write the IUPAC names of the following compounds. CH 3 i) CH 3 C CH 2 CH 2 CH = CH 2 CH 3 ii) CH 2 = CH CH CH 2 Cl Cl 82. Write the uses of Ethyl alcohol 1 Mark Questions 1. To convert the watch glass as a convex mirror, on which side of it the silver coating is done? 2. What is minimum distance between the object and real image in a concave mirror? 3. If an object is placed at the focus of a concave mirror, where is the image formed? 4. What kind of mirror can have a focal length of 10 cm? 5. Name the spherical mirror which can produce a virtual and diminished image of an object. 6. Which image does not form on a screen? 7. If the focal length of a concave mirror is 20 cm, what is its radius of curvature? 8. If the radius of curvature of a spherical mirror is 12 cm, what is its focal length? 9. Where the normals drawn at different points for a convex mirror meet? 10. A mirror is broken when it fell down will there be any change in its focal length? 11. What would have happened if convex mirrors were not found? 12. What happens if we use concave mirror as a rear view mirror? 13. Write the list of apparatus required to find the focal length of a concave mirror? 14. Write the preventive measures to be taken while finding the focal length of a concave mirror? 15. C F What is the beside ray diagram represents?

8 16. R P F C O C F 18. Which mirror has a wider field of view? Draw the reflected ray for the given figure. Draw the reflected ray for the given figure. 19. Why do we prefer a convex mirror as a rear view mirror in the vehicles? 20. Write a chemical reaction, when dilute HCl is added to zinc granules? 21. Name the precipitate formed in the following reaction AgNO 3 + NaCl AgCl + NaNO Which sign can be used for evolution of gas in a chemical reaction. 23. Which law state that total mass of the products formed in a chemical reaction must be equal to total mass of the reactants consumed? 24. In an experiment mixing of sodium sulphate solution to barium chloride solution which precipitate is formed and write chemical equation for it. 25. Addition of dry CaO to the water, what type of thermo chemical reaction taken place. 26. How many molecules present in 1 mole of hydrogen at S.T.P 27. NH 3 + Cl 2 NH 4 Cl + N 2 Balance the equation. 28. Give two example for oil factory indicators. 29. Which colour can be shown by methyl orange in the presence of NH 4 OH Solution? 30. Write balanced chemical reaction between Zn and NaOH. 31. What are the products formed when carbonates react with acids? 32. What is the final product formed when excess of CO 2 gas is passed through lime water? 33. To obtain dry HCl in the laboratory which type of delivery tube is used? 34. What happens when strong acids mixed with water? 35. The concentration H + ions of a solution is 10 6, what is the ph of the solution. 36. The concentration of OH ions is a solution is Then what will be the concentration of H + ions. 37. ph of the solution is 13, then what will be its property? 38. At what ph tooth decay takes place? 39. What is the nature of tooth paste? R What is the weak base used in the Antacid.

9 41. Which substance is injected into our body when Honey bee bites? 42. Which substance can give relief from the pain caused by Honey bee bites? 43. Write chemical formulae for washing soda? 44. In Chloro alkali process, what are substances formed at cathode? 45. What are uses of Cl 2 gas? 46. What are the uses of HCl? 47. Where should be the object placed if we have to use the convex lens as a magnifying lens? 48. What happens to the ray that is incident on a curved surface when it travels from denser medium to rarer medium? 49. What is the symbol used to represent a biconvex lens? 50. Where does the image form when the object is at infinite distance from the convex lens? What are the characteristics of the image? 51. What do we call the image which we can see with our eye? 52. Which type of image is formed by microscope? 53. How does a convex lens behave when it is placed in a medium with greater refractive index than that of the lens? 54. Write the list of the apparatus required to find the focal length of a convex lens. 55. Imagine what would have happened if the lens were not found. 56. A C B Incident ray AB falls on a lens. The refracted ray BC is shown in figure. Name the lens. 57. Name the lens shown in the figure? 58. What is the principle on which human eye functions? 59. What is the least distance of distinct vision for child below 10 years? 60. What is the least distance of distinct vision for old aged people? 61. What is the angle of vision for a healthy human being? 62. Which part of eye control the light entering the eye? 63. What happens, if the human eye lens have maximum focal length lens that 2.5 cm? 64. What happens if the human eye lens have maximum focal length greater than 2.27 cm? 65. What type of eye defect is seen for the aged people? 66. How can you rectify presbyopia? 67. What are the precautions we have to take while performing experiment in finding the refractive index of prism?

10 68. In VIBGYOR which colour as low refractive index? 69. What are the various phenomenon involved in formation of rainbow with a water drops? 70. If the angle between the incoming and out going rays of the water droplet is 40, which colour is seen? 71. Due to the scattering of which molecules present in atmosphere are responsible for appear sky in blue colour? 72. What will be colour of the sky in the absence of atmosphere? 73. Which of the colour in visible light have higher frequency? 74. Which colour is exhibited by cupric chloride on flame test? 75. Which coloured light is produced by sodium vapours in street light? 76. An electron in an atom has the following set of four quantum numbers to which orbital is belong to? n l m l m s Which rule is violated in the following electronic configuration? 1s 2s 2p 78. Which rule is violated in the following electronic configuration? 1s 2s 2p 79. Write the four quantum numbers for 2s 1 electron? Y 80. Observe the figure. Which is the orbital given? X 81. Ca, Sr, Ba are Dobereiners triads, Atomic weights of Ca and Ba are 40.0 and 137.0, then what is the Atomic weight of strontium. 82. Write any two limitations of Dobereiner's theory? 83. Write any two limitations of Newlands octaves theory? 84. How many groups and periods present in Mendeleev's periodic table? 85. What are the new elements discovered in place of Eka Boran, Eka Aluminium and Eka Silicon? 86. On which statement modern periodic table is constructed? 87. Alkali earth metals belongs to which group? 88. VI A (16) group elements belongs to which of family? 89. Write valency shell electronic configuration of IA group elements. 90. Which of the element in periodic table has highest ionization energy? 91. Which group elements of periodic table has highest Electro negativity values?

11 92. The element having atomic number 21, belongs to which group and which period in a periodic table. Imagine? 93. Among Cl and Cl, which will have larger size? 94. Among Na +, Mg 2+ and Al 3+. Write increasing order of ionic radii. 95. For the formation of ionic bond, the elements should have how much Electro negativity difference? 96. Among BF 3, BaCl 2, CH 4 which one is electron deficient compound? 97. Among H 2 O, HCl, SO 2, MgCl 2 which one is ionic compound? 98. What type of Hybridization present in BF 3 molecule? 99. Which theory can explain shape of the molecules? 100. What is the bond angle in BeCl 2 molecule? 101. What is the shape of NH 3 molecule? 102. How many σ and π bonds are present in O 2 molecule? 103. Draw the figure of BeCl 2 Molecule which has linear structure and identify the bond angle? 104. Draw the figure of BF 3 molecule formed by Hybridisation? 105. Draw the structure of H 2 O molecule Draw the Lewis dot structure of Ne atom A total charge of 90 coulombs flow in a conductor during a time of 4 minutes. What is the strength of current in the conductor? 108. Assume that the resistance of your body is 5,00,000 Ω and if you touch a 240 V wire, then how much current flows through your body? 109. Draw the shape of V I graph for a conductor? 110. Draw the shape of V I graph for a semi conductor? 111. What are the limitations of ohms law? 112. What are the uses of semi conductors? 113. Which instrument is used to measures electric current? 114. What are the devices which works on the magnetic effects of electric current? 115. What are the devices which works on the electric effects of moving magnets? 116. Name the components used in oersted experiment What happens if we replace Iron wire instead of copper wire in the oersted experiment? 118. What is the instrument that converts electrical energy to mechanical energy? 119. Where electric motors are used? 120. Where the electro magnets are used? 121. What is the phenomenon used in working of Bullet trains? 122. What is the principle used in metal detector? 123. What is the principle used in working of ATM card? 124. Cinnabar are belongs to which of metal extraction? 125. Write descending order of their reactivity among the following elements. Zn, Pt, Al, Na, K

12 126. Which metals can react with cold water gives H 2 gas? 127. The extraction of Cu from Cu 2 s, which substance is used for Auto reduction of sulphide ore? 128. Which metal can displace Ag metal from dicyanoargentate solution? 129. Which purification method is used for Blister copper? 130. Which type of Hybridisation involved in CH 4? 131. How many σ and π bonds are present in between carbon atoms of Ethyne molecule? 132. Draw the structure of urea molecule Which allotropic from of carbon has layered structure? 134. Which of the following compounds can have a triple bond? C 3 H 6, C 3 H 8, C 3 H Which of the following compounds can have a double bond? C 2 H 6, C 3 H 4, C 5 H Which of the following hydrocarbons is unsaturated? C 5 H 12, C 3 H 8, C 4 H Write the structure of 5, 6 di chloro oct 6, 7 di en 1, 2 di ol 138. Name the following compound. 2 OH CH 3 6 CH 3 Cl Writer: K. Gagan Kumar