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Revision Test - Chapter 2 & 9
1. A simple cell:
A. Contains two different electrodes.
B. Contains an acidic or ionic electrolyte.
C. Has a container called a voltameter.
D. All of the above apply.
2. Problems with simple cells, which have NOT been improved in the simple dry cell are, that:
A. they are not durable (electrolyte can spill or evaporate.)
B. they are ineffective due to polarisation.
C. they are not portable.
D. they cannot be recharged.
3. Polarisation in the simple cell is:
A. a reduction in the electric current flow due to build up of gas bubbles at an electrode.
B. more of a problem with the alkaline batteries than with the common dry cell.
C. does not interfere with the operation of the cell.
4. Consider the following combinations of electrodes. Assuming the same electrolyte, which combination is likely to produce the greatest voltage?
A. copper/zinc B. copper/Lead
C. copper/magnesium D. Aluminium/magnesium
5. In all electrochemical cells the energy change is
A. electrical to chemical.
B. chemical to mechanical.
C. chemical to electrical.
D. electrical to mechanical.
6. The life of a dry cell depends on:
A. how often the cell is used.
B. the size of the cell.
C. how much current is drawn from the cell.
D. all of the above.
7. The dry cell which will last the longest is:
A. AAA B. AA
C. D D. C
8. In the common dry cell, the substance that acts as a depolariser is - (Not on exam ans = A)
A. manganese (IV) oxide
B. ammonium chloride
C. zinc chloride
D. carbon
9. Examples of primary cells do not include -
A. simple cells
B. nickel-cadmium cells.
C. alkaline cells.
D. common dry cells
10. An example of a secondary (rechargeable) cell/battery is a/an -
A. solar cell B. lead/acid battery
C. electric motor D. generator
11. The lead/acid battery consists of 6 cells of 2V each connected in series. During normal use (discharge) - (not on exam ans = B)
A. lead sulfate is changed to lead and lead (IV) oxide.
B. lead and lead (IV) oxide are converted to lead sulfate.
C. sulfuric acid is replenished.
D. the density of the electrolyte increases.
12. Car batteries are normally recharged -
A. during normal running of the car.
B. by removal from the car and connection to a recharger.
C. using a hydrometer
D. by adding distilled water.
13. It is important to add water to most lead/acid batteries because -
A. some water evaporates.
B. some water is decomposed to hydrogen and oxygen during recharge.
C. both of the above.
14. A hydrometer floats high in the acid from a battery. We can conclude that - (Not on exam Ans = B)
A. The electrolyte is dense and the battery is flat.
B. The electrolyte is dense and the battery is fully charged.
C. The electrolyte has low density and the battery is flat.
D. The electrolyte has low density and the battery is fully charged.
15. Michael Faraday discovered a link between electricity and magnetism. Experiments revealed -
A. an electric current causes a magnetic compass needle to move.
B. a wire moving in a magnetic field produces a current in the wire.
C. a wire carrying current through a magnetic field moves.
D. all of the above.
16. A generator converts -
A. chemical energy to electrical energy. B. kinetic energy to electrical energy.
C. kinetic energy to chemical energy. D. AC to DC
17. A number of improvements can be made to the simple generator to increase its electrical current. One alteration that would not be an improvement would be -
A. increasing the size of the magnetic field. B. rotating the coils more rapidly.
C. inserting a soft iron core. D. using fewer coils of wire.
18. A simple generator can be produced by pushing a magnet into a coil of wire. When a student pushes the south pole of a magnet into the coil, the meter’s needle deflects to the right. The needle will deflect to the right again if the student -
A. pulls the south pole of the magnet away from the coil.
B. pushes the north pole of the magnet into the coil.
C. holds the magnet steady and moves the coil towards the south pole of the magnet.
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