Exercise, 8th Science  - 4. Current Electricity and Magnetism.

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1.  The cell is shown by the symbol ....... .
2. Hans Christian Oerstead made observation that ....... ...... is created when an electric current flows in a wire.
3. Write two commercial uses of  Lithium ion cells.
4. ....... in the wire flow due to the potential difference between the two ends of the dry cell.
5. The ..... cells are rechargeble.
6.  In .....  cell, the electrolyte of a wet pulp of Zinc chloride (ZnCl2) and Ammonium chloride (NH4Cl).
7.  ..... are used to produce strong magnetic field useful in scientific research.
8. The Ni-Cd cells deliver ..... V potential difference.
9.  Electrical charge flowing through a wire in .... second can be called unit current.
10. What will happen if a glass rod is rubbed on a silk cloth?
11. Write long form of UPS.
12. Draw diagram of dry cells.
13. Moving negatively charged particle are the ........ .
14. The system of coil and the screw is called an ....... .
15. We get current electricity when the ..... in an electrical conductor are made to flow.
16. Electric current is a scalar quantity. Write true or false.
17. Draw figure of Electric bell.
18. In  series connection, if each cell has a potential difference of 1.2 V the total potential difference of 3 cells will be .... V.
19. The electric level deciding the direction of flow of electric charges is called ......  .......  .
20. In a dry cell ..... metal layer is the negative terminal of the cell.
21.  The unit of potential difference in SI system is ...... .
22.  The SI unit of electric current is Coulomb per second or .......  .
23. In Lead-Acid Cell, the potential difference between two terminal is nearly ..... V.
24.  Which constituents are present in an atom ?
25.  Conventional current flows in the ..... direction.
26. There is a graphite rod at the centre of the dry cell. This is ...... terminal of the cell.
27. The difference between the potential of two points, is called .......   ......  .

         

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