Give me Maharashtra Board 10th Science Objective Questions ?

47. The formula of sodium ethoxide is _____________. 48. The name of compound CH3COONa is ___________________________. 49. The molecules of soap are sodium or potassium salts of long chain ________________________. 50. __________ + Cl2 ___________ CH3Cl + HCl (________) (chlorine gas) (methyl alcohol) (hydrochloric acid) 51. The ethyl alcohol is commonly called as __________. 52. In 19th century, compounds directly or indirectly obtained from plants and animals were regarded as __________ compounds. 53. Methane is called as _________________. 54. Compounds containing covalent bonds are generally ______________in water. 55. Scientist Wohler synthesized the compound ________ from an inorganic compound Ammonium cyanate. 56. If two electron pairs are shared between two atoms, then a ___________________________bond. 57. Compounds obtained from __________ were termed as inorganic compounds. 58. __________________________ is also known as chemistry of carbon compounds. 59. All fundamental organic compounds containing hydrogen along with carbon are called as _______________compounds. 60. The electronic configuration of hydrogen is ____. 61. Carbon has four electrons in its outermost orbit and hence it is _________________. 62. The various structures of oxygen molecule are O: :O , O?O and __________. 63. The electronic configuration of nitrogen is (2,5) hence it will form ____molecule. 64. Hydrocarbons in which the carbon atoms are linked to each other only by single bonds are known as __________ hydrocarbons. 65. Hydrocarbons in which carbon atoms are linked to each other by ________or ___________bonds are known as unsaturated hydrocarbons. 66. The straight chains or closed chain structures of hydrocarbons may be having branches and cross links are known as closed chain or ________compounds. 67. The general formula of alkynes is ________________. 68. The graphite has _____________________colour with beautiful crystalline appearance. 69. In diamond, each carbon atom is linked to four other neighbouring carbon atoms held at the corners of regular _____________________ by covalent bonds to form a rigid 3-dimensional structure. 70. The compound C7H16 has name ___________. 71. Compounds with identical ___________________________ but different structure are called as isomers and the property is known as isomerism. 72. All organic compounds are considered as derivatives of ____________________. 73. The _______________ are formed by replacing one or more hydrogen atoms in a molecule by other atom or group of atoms. 74. After replacing some atom or group of atoms from hydrocarbons, a new set of compounds is formed which has functions ____________from parent hydrocarbon. 75. The atom or group of atoms present in the molecule which determines ______________________property of organic compounds is called as functional group. 76. Physical properties like melting point, boiling point, density, generally show gradual change with increase of _______________________ in homologous series. 77. The full form of IUPAC is _______________________________________________________________________. 78. To express the name of the basic carbon is modified by _________. 79. A root indicates the “nature of basic carbon ___________”. 80. ___________denotes the type of bonds or functional group present in the carbon chain. 81. CH3-CH-CH3 is the compound with IUPAC name _________________. I Br 82. Saturated hydrocarbons give a ________ oxidizing flame when they burn. 83. ___________indicates the presence of other functional groups and their position. 84. CH4(g) + 2O2(g) ? _________ + _______ + __________ 85. CH4 + O2 ? C + _________ (limited air) (carbon black) 86. Unsaturated carbon compounds give a reducing flame of _________ colour with lots of carbon. 87. Fuels such as coals for engine and petroleum for vehicle, on combustion, results in formation of oxides of ____________and ______________. 88. The reaction in which 2 molecules react to form a single ___________ is known as addition reaction. 89. 2CH3COOH + _______ ? ______________ + H2 90. __________quality of fats and oils used for raw material in toilet soap. 91. CH3CH2I + _______ ? __________ + KI (substitution reaction) 92. R - C – R’ is the general formula of ____________. II O read less

93. In diamond, there are no __________electrons in the system. 94. Graphite is a good conductor of _____________. 95. In case of graphite, each carbon atom is attached to three other carbon forming a ________________ planar structure. 96. At one end of soap molecule , there is ___________________________ which is hydrophilic. 97. Ethanoic acid is colourless liquid, with ____________ smell at ordinary temperature. 98. When ethyl alcohol reacts with PCl3 we get ethyl chloride with another compound having formula _________. 99. The long non polar end of soap molecule is made of ____________________chain. 100. The long non polar end of soap molecule is _______________ in oil. read less

1. The magnet in which magnetism is induced in the disc with help of electricity is called as _________________. 2. Electromagnet is used in loading and transporting scrap and loose ________________________ in a steel mill. 3. Antenna work on the principle of ________________________. 4. The path along which the unit north pole moves in a magnetic field is called as ____________________________. 5. The insulation of wire must be checked ________________________. 6. ___________________________should be switched off during lightning. 7. ____two magnetic lines of force can intersect each other. 8. The magnetic lines of forces is also called as ___________________________________. 9. In Fleming’s left hand rule, forefinger, the central finger and thumb of your left hand are _________________perpendicular to each other. 10. Electric cranes work on the device _____________. 11. A _____________________ is an instrument which is used to detect the presence of current in circuit. 12. In direct current, the magnitude and direction of current is ______________. 13. A generator which converts mechanical energy into ___________________ in the form of alternating current is called as AC generator. 14. The output in DC generator is showing by glowing bulb connected cross the ___________brushes. 15. An __________________ is a safety device used to save the electrical appliances. 16. If a live wire and a neutral wire come in direct contact or touch each other, ___________________takes place. 17. In Fleming’s right hand rule, the thumb, forefinger and middle finger are ___________________to each other. 18. In Fleming’s right hand rule, the induced current is found to be maximum when the _____________of motion of coil is at right angles to magnetic field. 19. In electric motor the battery supplies the current to the _______________________. 20. The ___________at any point on the magnetic lines of force gives the direction of the magnetic field at that point. 21. Magnetic lines of force are ______________where the magnetic field is strong and _________from each other where the field is weak. 22. If current is passed through a wire, ________________is produced near it. 23. Scientist ________________shoed that electricity and magnetism are related phenomena. 24. When a strong electric current is passes through a wire, then electric current produces ______________________. 25. A compass needle is a small _________________. 26. The end of the magnet which points towards north is called as __________________. 27. The end which points towards _____________is called as south seeking pole. 28. The variable resistance is called as ___________. 29. The magnitude of the field produced at a given point is _________ proportional to the magnitude of the current passing in the wire. 30. The magnetic field produced by a given current in the wire ___________as the distance from the wire increases. 31. In Right hand thumb rule, thumb points towards the direction of __________, then the curled fingers around the conductor will give the direction of ____________________________. 32. Thus if coil has ‘n’ turns, the field produced is __________ larger than that produced by a single turn. 33. A coil of many turns of insulated copper wire in the shape of __________ is called as solenoid. 34. The solenoid has all the properties of the field produced by a _________________. 35. With the help of solenoid we can ________________ a piece of rod of a given material. 36. _______________magnets are usually made up of carbon steel, chromium steel, cobalt and tungsten steel and some alloys. 37. Nipermag is an alloy of iron, _____________, ______________ and ________________. 38. Alnico is an ___________________________________alloy. 39. There is relationship between the direction of the current, the field and the __________of the conductor. 40. Scientist ________ suggested that the magnet must also exert an equal and opposite force on the current carrying conductor. read less

41. The ______________of rod is maximum when the direction of the current is at right angles to the direction of magnetic field. 42. _____________ is a flow of charge. 43. The moving charges in magnetic field would experience a force which is used to _____________ charged particles to very high energies. 44. Electric current produces ______________________, even if the current is very weak. 45. _____________________which travels along the nerve cells in our body provides magnetic fields. 46. _________and __________ are the 2 main organs where significant magnetic fields can be produced. 47. If we touch something, our nerves carry an electrical impulse to the __________we need to use. 48. The full form of MRI is ______________________________________________. 49. Analysis of images brain and heart using MRI technique help doctors to diagnose _______________of the brain. 50. A device which _______________________ into __________________________ is called an electric motor. 51. Electric motor works on the principle that a current carrying ______________placed in a magnetic field experiences a force. 52. ___________________________________ consists of two halves of a metallic ring. 53. _______________ reverses the direction of current in armature coil. 54. _____________________________trains do not run on rails but float above them. 55. The coil in the electric motor rotates with the help of _______________________. 56. If a conductor is moving inside a magnetic field or magnetic field is changing around a fixed conductor, ______________________is generated. 57. The process by which a changing magnetic field in a conductor induces a _________in another current is called as electromagnetic induction. 58. Electromagnetic induction was first studied by scientist ____________. 59. The frequency of direct current is ____________. 60. The frequency of AC current is _______in India. 61. An alternating current reverses its current ____________________. 62. The alternating current is used in electrical ____________appliances such as electric heater, refrigerator, iron, etc. 63. ________________________can be transmitted over long distances without loss of energy in alternating current. 64. Faraday in _________, found that electricity could rotary motion. 65. In _______, Faraday showed that relative movement between a magnet and a coil of wire could induce electricity in coil, an idea which gave birth to modern generators. 66. Electric generator works on the principle of __________________________________. 67. If the current in a circuit is zero, the galvanometer will show ______ deflection or no deflection. 68. If the induced current produced is of ______________nature then such a current is called as alternating nature. 69. ____________________means the flow of large amount of current in the circuit beyond the permissible value of current. 70. If many appliances of high power rating are switched on simultaneously, _____________occurs which causes fire. 71. __________________can be avoided by connecting few appliances at a time in the circuit. 72. Switching off the electrical circuits during lightning will save the electrical appliances from__________________. 73. If we touch the metallic body of the appliance which is in contact with live wire, we may receive _________ shock. 74. To avoid such accidents, metal castings of all electrical appliances must be ______________. 75. The system of connecting the metal casing of an electrical appliance with a __________ buried deep inside the earth is called as earthing. 76. During a short circuit, the ______________ of the circuit becomes very small and huge amount of current flows through it. 77. The state electricity board provides us electric power supply for houses and factories is supplied through ______________________ or overhead wires. 78. The phase wire is also called as ____________________________. 79. The potential difference between live wire and neutral wire is ___________. 80. The output electric power from the main switch is distributed to ____________________ electric circuit. read less

1. A mirror is a ____________________surface. 2. The object is always placed on the ______ of the mirror. 3. The unit of power of lens is _________________. 4. ____________________is used in spectacles to correct defect like hypermetropia. 5. Presbyopia is also called as __________________________________. 6. The imaginary straight line passing through the two centres of curvature of lens is called as ___________. 7. A __________ is a transparent material bound by two surfaces, out of which at least one surface is spherical. 8. A lens having both spherical surfaces, bulging outward, is ____________convex lens. 9. A ___________________lens is a converging lens. 10. _________________is light sensitive screen. 11. 1 cm = 1/ (______dioptre) 12. The ____________forms a transparent bulge on the surface of eyeball. 13. The transparent biconvex crystalline located just behind the pupil is called as __________. 14. The _____________________is used to correct near sightedness. 15. Large _________________________ are used to concentrate sunlight to produce heat in solar furnace. 16. ______________________________are used in different optical instruments like camera, spectrometer, etc. 17. The small opening of variable diameter at the centre of iris is called as ______________. 18. The focal length of concave lens is _____________. 19. The distance between principal focus and ______________________of the lens is focal length . 20. The height of the image is to be taken as positive for __________images. 21. If the object is placed at principal focus F of concave mirror then image is formed at ____________. 22. If the incident ray is passing through the _________then the reflected ray is parallel to principal axis. 23. The centre of the spherical mirror is ___________. 24. ______________________is a plane glass sheet having one side coated with a thin reflecting layer of silver and painted by red colour to protect the coating. 25. One surface of glass is coated with reflecting layer to make the other surface reflecting is a _______________. 26. _____________is a form of electromagnetic radiation that produces sensation of vision. 27. The real image can be obtained on a ___________. 28. The image made by a plane mirror is a ____________________. 29. When light rays from the same point source are spread away from each, it is __________________________. 30. A specialized pictorial representation used to trace the path of ray of light is called as ____________________. 31. Focal length of convex mirror is __________________. 32. The position of object is 2F1 then the image is formed at __________of same size. 33. The magnification produced by a lens is given by formula M = ____________ 34. The power of lens is the reciprocal of the the ___________________. 35. The tendency of pupil to adjust the opening for light is called as __________________. 36. The light enters the eye through ______________. 37. The ability of ________of adjusting focal length is known as power of accommodation. 38. The lens formula is given by f = vu/_______. 39. The colours of __________are different for different people. 40. The ________is useful to control and regulate the amount of light entering the eye. 41. Weak action of ___________________cause low converging power of eye lens. 42. ____________ is a form of electromagnetic radiation that produces the sensation of vision. 43. The mirror formula of spherical mirror is given as f = (u - ___)/vu. 44. The position of object is at centre of curvature C for a concave mirror then image is formed ____________________________________. 45. Distances measured perpendicular to and below the principal axis are taken as _______________. 46. When a ray of light passes through the optical centre of a lens, it passes without any ___________________. 47. In flood lights, the source is placed beyond the _________________________________ to get intense beam of light. 48. A magnification of ____ times is obtained by simple microscope. 49. The power of spectacles of hypermetropic eye is _____________. 50. If the inner side or concave side of the spherical surface is polished, it is ___________________________. 51. If the rays parallel to principle axis gets ___________________after reflection then it is called as diverging mirror. 52. The straight line passing through the pole and centre of curvature of mirror is its _____________________. read less

53. R = 2 x ___ 54. The distance between the centre of curvature and pole of the ___________ is radius of curvature. 55. The distance between pole and the focus is called as ___________________of mirror. 56. We are able to see any object when ________________ from that object enter our eyes. 57. In streetlights, ______________beam is used. 58. Images formed by a concave mirror can be studied with the help of ___________________. 59. The position of object is between focus F and centre of curvature C then the image is formed by concave mirror _________________________________. 60. The principal axis is taken as X-axis of ______________________. 61. The distance of the object from the pole is represented by ____. 62. The height of the object is represented by ____. 63. The nature of image is _________and ___________if the concave mirror is placed between the pole and principal focus. 64. A lens having both surfaces curved __________ is a concave lens or double concave lens. 65. Each lens has two _____________________________ C1 and C2 respectively. 66. The __________________ of lens on the principal axis is its optical centre. 67. The distance between the ________ and the lens is the focal length of the lens. 68. A ray of light passing through the optical centre passes through the optical centre ___________________. read less