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physics 13 electricity and magnetism
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Q.1. Which is the basic property associated with matter due to which it produces and experiences electrical and magnetic effects?
Q.2. Who named the two types of charges as positive and negative?
Q.3. Which type of charges repel each other?
Q.4. Which type of charges attract each other?
Q.5. What happens due to transfer of electrons from one body to other body?
Q.6. Write the SI unit of charge?
Q.7. Name those materials which allows electicity to pass through themselves?
Q.8. Metals like silver,iron,copper and Earth {especially the moist part} acts like?
Q.9. Which is the best conductor of electricity?
Q.10. Name those materials which do not allow electicity to pass through themselves?
Q.11. Wood, paper, mica, glass, ebonite are the examples of?
Q.12. Name the law according which, 'the force of attraction or repulsion between two point charges at rest is directly proportional to the product of the magnitudes of the charges and inversely proportional to the square of the distance between them'?
Q.13. What is the amount of charge per unit area on the surface of conductor called as?
Q.14. On what factors the surface density of charge at a point on the surface of conductor depends upon?
Q.15. The surface density of charge at any part of the conductor is inversely proportional to?
Q.16. Name the region in space around a charge or charged body where the charge has its electrical effect?
Q.17. Name the force experienced by a unit positive charge placed at a point in an electric field?
Q.18. What is the electric field intensity inside a charged hollow conductor?
Q.19. The charge given to a hollow conductor remains on the its surface only, thus it acts as an?
Q.20. Why it is safer to sit in a car or bus during lightning?
Q.21. What is the work done in bringing a unit positive positive charge from infinity to a point in an electric field?
Q.22. Write the SI unit of electric potential?
Q.23. What is the direction of electric potential?
Q.24. What is the work done in bringing a unit positive charge from one point to other point?
Q.25. Write the SI unit of potential difference?
Q.26. What is the direction of potential difference?
Q.27. Name the charge required to increase the potential of the conductor by unity?
Q.28. Write the SI unit of electric capacity of a conductor?
Q.29. Name the device which converts chemical energy into electrical energy?
Q.30. Name the cell in which electrical energy is obtained from the irreversible chemical reaction taking inside it and it become unserviceable after complete dischage?
Q.31. Voltaic cell, Leclanche cell, Daniel cell, Dry cell are all examples of?
Q.32. Name the cell which has to be charged at first from external electric source and it can be used to draw current and it can be recharged or reused?
Q.33. Who firstly discovered the production of electricity by chemical reaction?
Q.34. Name the cathode and anode in voltaic cell,which are placed in sulphuric acid kept in glass vessel?
Q.35. Name the cathode and anode in Leclanche cell, which are placed in ammonium chloride solution kept in glass vessel?
Q.36. Write the electomotive force{emf} of Leclanche cell?
Q.37. Electric bell is an example of?
Q.38. Name the cathode and anode in Dry cell,which are placed in solution of magnese oxide, ammonium chloride and carbon is kept in zinc vessel?
Q.39. Write the emf of dry cell?
Q.40. The rate of flow of charge or charge flowing per unit time interval is called as?
Q.41. What is the direction of electric current?
Q.42. Write the SI unit of electric current?
Q.43. How many electrons are entering from one end or leaving from other end of the conductor in one second?
Q.44. The opposition offered by a conductor to the flow of current through it is called as?
Q.45. What arrises due to collisions of drifting electrons with the core ions?
Q.46. Write the SI unit of resistance?
Q.47. Name the law which states that, 'if physical conditions like temperature, intensity of light etc. remains unchanged then electric current{I} flowing through a conductor is directly proportional to the potential difference{V} across its end'?
Q.48. The resistances of such conductors which obey ohm's law are known as?
Q.49. Give an example of Ohmic resistance?
Q.50. The resistances of such materials which do not obey ohm's law are known as?
Q.51. Give the examples of non ohmic resistance?
Q.52. The reciprocal of resistance of a conductor is called as?
Q.53. Write the SI unit of conductance?
Q.54. The reciprocal of resistivity of a conductor is called as?
Q.55. Write the SI unit of conductivity?
Q.56. Write the unit of specific resistance?
Q.57. What happens to the resistance and specific resistance on streching a wire?
Q.58. What happens to the resistance of metal on increasing its temerature?
Q.59. What happens to the resistance of semiconductor on increasing its temperature?
Q.60. What happens to the resistance of electrolytes on increasing its temperature?
Q.61. What is done to protect tall buildings from the destructive effect of the lightning?
Q.62. The heating effect of electric current is known as?
Q.63. Electric bulb, electric kettle, heater etc. devices work on the principle of?
Q.64. The rate at which the electric current is consumed in a circuit is known as?
Q.65. Write the SI unit of electric power?
Q.66. 1 Kilowatt hour is equal to
Q.67. One kilowatt hour is also known as?
Q.68. Which device is used to measure electric current in a circuit?
Q.69. In which combination is ammeter connected in the circuit?
Q.70. What is the resistance of an ideal ammeter?
Q.71. Which device is used to measure the potential difference between two points in a circuit?
Q.72. In which combination is voltmeter connected in a circuit?
Q.73. What is the resistance of an ideal voltmeter?
Q.74. A small conducting wire of alloy of copper,tin and lead which is used as a protective device connected in series with an electric appliance to save it from being damaged due to high current is named as?
Q.75. What is pure fuse made up of?
Q.76. Which device is used to detect and measure electric current {upto 10-6 A} in a circuit?
Q.77. Name the wire of very small resistance?
Q.78. What a galvanometer can be converted into, by connecting a shunt parallel to it?
Q.79. What a galvanometer can be converted into, by connecting a very high resistance in its series?
Q.80. Which device based on electromagnetic induction principle,converts low voltage A.C. into high voltage A.C. and high voltage A.C. into low voltage A.C.?
Q.81. Which device based on electromagnetic induction principle, converts mechanical energy into electrical energy?
Q.82. The current generated in the power stations are alternating current having how much voltage?
Q.83. How much voltage can be increased with the help of transformers in grid substations{GSS} to minimise loss of energy in long distance transmission?
Q.84. A piece of iron or other materials that can attract iron containing object and point towards North when suspended is known as?
Q.85. Name the pole of magnet which is always directed towards the North when it is freely suspended?
Q.86. Name the other pole of magnet which is always directed towards the South?
Q.87. When a magnet is freely suspended,it aligns itself in which geographical direction?
Q.88. Which magnetic substances are attracted by magnets?
Q.89. Which poles of magnets repel each other?
Q.90. Which poles of magnets attract each other?
Q.91. What happens on placing a magnetic substance near a magnet?
Q.92. Name the region in space around a magnet where it has its magnetic effect?
Q.93. Name the force experienced by a north pole of unit strength placed at a point in a magnetic field?
Q.94. Write the SI unit of magnetic flux density?
Q.95. Name the imaginary closed curves, directed north to south pole outside the magnet while inside the magnets they are from south to north pole, representing a magnetic field graphically?
Q.96. The tangent drawn at any point on the magnetic lines of force gives?
Q.97. What will be the magnetic field if the lines of force are crowed?
Q.98. What will be the magnetic field if lines of forces are parallel and equidistant?
Q.99. Name the substances which when placed in magnetic field, acquire feeble magnetism opposite to the direction of magnetic field?
Q.100. Write some examples of diamagnetic substances?


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