Sunday, 15 April 2018

Some Important Four Marks Questions For 10Th Class Students in Physical Science


1. Write the balanced chemical equation for the following reactions.
i) Calcium hydroxide + Carbondioxide Calcium carbonate + Water
ii) Zinc + Sodium Hydroxide Sodium Zincate + Hydrogen
iii) Magnesium + Hydrochloric acid Magnesium chloride + Hydrogen
iv) Sodium hydroxide + Sulphuric acid Sodium sulphate + Water
2. Mention and explain the factors of influencing Ionization energy.
3. 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?
4. State Junction law, Loop law and explain each law with one suitable example.
5. How do you verify experimentally that, the focal length of a convex lens is increased when it is kept in water?
6. Write down the process and materials used in the experiment of the reaction of carbonates and metal hydrogen carbonates with acids produces corresponding salts, carbon dioxide, gas and water
7.  Describe the image formation by a convex lens for various positions of the object.
8. There resistors 2 , 4 , 8 are connected in (a) series, (b) parallel. Find the resultant resistance in the circuit.
9. Explain how the quantum numbers is useful to understand atomic structure.
10. Explain metallic corrosion? Mention the measures methods to be taken to prevent metallic corrosion.
11. Which experiment do you suggest to understand faraday's law? Which instruments are required? What suggestions do you give to get good results of the experiment? Mention the precautions also.
12. Describe an experimental procedure with the help of a diagram to show that "every compound which has hydrogen is not an acid".
13. List the materials required for conducting an experiment to find the focal length of a Concave mirror. Explain the experimental process also.
14. How can you verify with experiment ''The magnetic field lines are closed loops''?
15. Define the terms with respect to a prism.
a) Angle of incidence
b) Angle of emergence
c) Angle of deviation
Draw a ray diagram to show the angle of deviation when a ray of light passes through a glass prism.
16. A transparent sphere of radius R and refractive index n is kept in air. At what distance from the surface of the sphere should a point object be placed on the principal axis so as to form a real image at the same distance from the second surface of the sphere.
17. Write short notes on the following
a) Distillation b) Poling c) Liquation d) Electrolysis
18. Balance the following Chemical equations
i) Zn (s) + AgNO3 (aq) Zn (NO3)2 (aq) + Ag (s)
ii) Fe2O3(s) + C (s) Fe(s) + CO2
iii) Ag (s) + H2S (g) Ag2S(s) + H2O (l)
iv) Cu (s) + O2 (g) CuO (s)
19. Why do we call alkanes as Paraffins? Explain the substitution reaction of alkanes.
20. Write any 4 Characteristic features of homologous series of organic compounds.
21. Two elements x and y belong to Groups 1 and 2 respectively in the same period of the Periodic table.
Compare these elements with respect to
i) Number of electrons in their outer most orbit.
ii) Their atomic size and their valences.
iii) Their ionization energy and metallic character.
iv) Formula of their chlorides and sulphates.
22. Alkanes are considered as paraffins, so they undergo Substitution reactions but not addition reactions. Explain with Suitable example.
23. Write on activity to know whether an acid is strong or weak.
24. Explain the formation of double bond and triple bond according to Lewis theory.
25. Sudheer wants to verify the laws of reflection. What apparatus he requires to prove them? State the laws of reflection and write the experimentation Process he follows.
26. How do you appreciate the working of ciliary muscles in the eye?
27. i) We can save the house hold wiring and devices by using fuses. Write any four points by appreciating the role of fuse.
ii) A Wire of length 1m and radius O.1 mm has a resistance of 100 . Find the resistivity of the material.
28. Explain Bohr -Somerfield model of an atom.
29. Draw Moeller's chart showing the increasing order of energy levels of various orbitals.
30. Write at least 8 various applications of Faraday's law of electromagnetic induction in daily life.
31. What is presbyopia? How is it corrected?
32. Distinguish between esterfication and saponification reactions of organic compounds.
33. Explain the formation of Sodium chloride and Calcium oxide on the basis of the concept of electron transfer from one atom to another atom.
34. State the methods used for the purification of crude metals. Explain in which context these methods are used.
35. What are the factors affecting the resistance of an electric conductor? Explain any two factors.
36. a) What are the various possible structural formulae of a compound having molecular formula C3H6O?
b) Give the IUPAC names of the above possible compounds and represent them in structures.
c) What is the similarity in these compounds?
37. Without knowing the electronic configurations of the atoms of elements Mendeleev still could arrange the elements nearly close to the arrangement in the Modern Periodic Table. How can you appreciate this?
38. How do you appreciate the role of spherical mirrors in our daily life?
39. What factors influence the evaporation process? Explain with the help of an experiment.
40. What are the materials required for doing Oersted experiment of electromagnetism. Write the procedure of the experiment. What do you understand from this experiment?
41. In an atom the number of electrons in N -shell is equal to the number of electrons in K, L, M shells.
Answer the following questions.
a) Which is the outermost shell?
b) How many electrons are there in its outermost shell?
c) What is the atomic number?
d) Write the electronic configuration of the element?
42. An object is placed at a distance of 24 cm from a convex mirror of focal length 30 cm then finds the position and nature of the image?
43. How many types of images form due to lenses? What are those? Mention the differences between them.
44.  Write the main points of Valence Shell Electron Pair Repulsion Theory (VSEPRT)?
45. Write the postulates of Bohr's atomic model and mention its limitations.
46. List out the apparatus required to find the refractive index of a prism experimentally. Explain the procedure with the help of a rough diagram.
47. Acids produce ions only in aqueous solution. How can you justify your answer with an experiment?
48. Mention the sign convention for the parameters related to the mirror equation.
49. Explain some important reaction with examples that takes place in Carbon compounds.
50. 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.
51. Explain the effects of electric shock on human body.
52. 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
53. Mention the unique properties of Carbon.
54. Mention the factors affecting the formation of Cations an Anions.
55. Write the list of apparatus required to verify experimentally that the resistance of a conductor is inversely proportional to cross section area. Write the procedure of the experiment with the help of a diagram.
56. Describe the image formation by a convex lens for various positions of the object.
57. Sky appears sometimes white and sometimes blue in colour, and Sun appears red in colour during Sunrise and Sunset. State the reasons.
58. Explain the formation of Ionic Compounds NaCl, MgCl2 through Lewis electron dot symbol.
59. What are the different stages of extraction of metal from an ore? Write a note on any one of the stages.
60. List out the apparatus required to verify that V/ I is constant for a conductor. Explain the experiment with help of a diagram.
61. Write an experimental method in measure the distances of object and image using concave mirror and write the table for observations.
62. Explain the nature of images formed with the help of ray diagrams, when an object is placed at different points before a concave mirror
63. In Doshagna's house there are four tube lights, two fans and one television. A tube light consumes 40 W, a fan 80 W, a TV 100 W. If each tube light is used for 5 hours, two fans for 12 hours and TV for 6 hours in a day. Find the cost of electric energy used 30 days at the rate of Rs.2 per unit.
64. Write an activity about how you conduct an experiment to show that more reactive metals replace less reactive metals from their compounds.
65. Explain the formation of Nitrogen Molecule.
66. You are given two acids. How can you test them to know which is strong acid and which is weak acid?
67. What are the materials required to prove that the local length of the lens depend upon surrounding medium? Write the procedure.

68. How do you appreciate the role of iris, lens, retina and ciliary muscles in visualizing the colorful world to us?
69. An object is placed at (i) 5 cm; (ii) 10 cm in front of a concave mirror of radius of curvature 15 cm. Find the position, nature and magnification of the image in each case.
70. Write the common defects of vision and explain with diagrams. How can you correct these visual defects by using lens?
71. Explain the principles used to explain the electronic configuration with one example each.
72. Write the formation of double bond and triple bond according to valence bond theory.
73. List out the materials used in an experiment to prove when acid reacts with metal evolves Hydrogen gas. Describe the experimental process
74. How do you extract metals of high reactivity? Explain that process with an example.
75. Draw Moller's chart showing the increasing order of energy levels of various orbitals.
76. A person is suffering from certain eye defect. When he contacted the doctor, then doctor told him to wear concave lens. Then what is the defect from which the person is suffering and draws the ray diagram to correct that defect by using concave lens.
77. How do you explain the process of artificial ripening of fruits by ethylene?
78. What is Hybridization? Explain the formation of BeF2 molecule using hybridization.
79. Explain the formation of a virtual image by a concave mirror.
80. Ravi wears a spectacle. From that his eyes observed to be bigger in size.
i) What lens is used by him?
ii) What is the eye defect he is suffering from? Draw the ray diagram of the defect and explain.
81. Draw-ray diagrams for image formation by a convex lens when
I) object is placed between the centre of curvature and focal point,
II) When the object is placed between focal point and optic centre,
Also mention the nature of the image formed in each case
82. What is meant by 'Water of Crystallization' of a substance? Describe an activity to show the water of Crystallization
83. What are the various physical methods used for enrichment of the ore. Draw the diagram of the method which is mainly useful for Sulphide ores which have no wetting property whereas impurities get wetted
84. Name the four chemicals that are obtained from common salt and write their molecular formulae.
85. Why should we balance a chemical equation? Take any one chemical equation and explain the procedure of balancing it.
86. Equal lengths of Magnesium ribbons are taken in two test tubes X and Y. Hydrochloric acid is added to test tube X and Acetic acid is added to test tube Y. In which test tube, the reaction will be more vigorous? Why?
87. Describe the process of preparation of Bleaching Powder? Write its uses.
88. How do you appreciate the working of ciliary muscles in the eye?
89. What is a furnace? Mention the main difference between blast furnace and reverberatory furnace. Draw a neat diagram of reverberatory furnace.
90. Calculate the magnification values for concave mirror when the object is placed
A) At the principal focus
B) Between the pole and the principal focus. Give reasons.
91. The Electronic Configuration of X, Y, Z are given below.
X: 2,
Y: 2, 6;
Z: 2, 8, 2
Answer the following questions.
a) Which element belongs to 2ndperiod?
b) Which element belongs to 18thgroup?
c) Which element belongs to 2ndgroup?
d) What is the valency of element B?
92. What are the rules to be followed while filling electrons in atoms which contain more than one electron? How do you fill the electrons in degenerate orbitals? Explain.
93. What is thermite process? Mention its applications in daily life.

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