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K.C.S.E Physics Q & A - MODEL 2018PP2QN12
State the purpose of manganese(IV) oxide in a dry cell
answer
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K.C.S.E Physics Q & A - MODEL 2017PP2QN04
State what is meant by polarisation in simple cells.
answer
K.C.S.E Physics Q & A - MODEL 2016PP2QN07
​Figure 5 shows the cross-section of a dry cell. Use the information on the figure to answer questions below
​(a) Name the parts labeled A and B.
(b) State the use of manganese (IV) oxide in the cell.
answers
​(a) A – Carbon rod or graphite rod
B – Mixture of Manganese (IV) oxide with carbon powder (b) Manganese (IV) oxide is a depolarizer or oxidizing agent. It is used to oxidize hydrogen to water
K.C.S.E Physics Q & A - MODEL 2015PP2QN03
State the reason for topping up a lead - acid accumulator with distilled water.
answer
K.C.S.E Physics Q & A - MODEL 2012PP2QN03
​Figure 3, shows four identical light bulbs connected to a 15 volts battery whose internal resistance is negligible.
​Determine the reading of the voltmeter V.
answer
K.C.S.E Physics Q & A - MODEL 2011PP2QN04&5
Figure 4. shows the cross-section of a dry cell. Use the information on the figure to answer questions 4 and 5.
​Name the parts labelled A and B.
State the use of the manganese (IV) oxide in the cell.
answers
​4. A = Carbon rod(+);
B = Manganese (VI) oxide 5. Manganese (IV) oxide is a depolarizer/oxidizing agent; Give a reason why it is necessary to leave the caps of the cells open charging an accumulator.17/7/2020
K.C.S.E Physics Q & A - MODEL 2009PP2QN04
Give a reason why it is necessary to leave the caps of the cells open charging an accumulator.
answer
K.C.S.E Physics Q & A - MODEL 2007PP2QN02
State one advantage of an alkaline cell over a lead – acid cell
answer
K.C.S.E Physics Q & A - MODEL 2006PP2QN04
State a reason why the caps of the cells of a lead- acid battery are opened when charging the battery.
ANSWER
K.C.S.E Physics Q & A - MODEL 2005PP1QN09&10
​Fig 7 shows the features of a dry cell(Luclache). Use the information in the figure to answer question 9 and 10
​State the polorites of the parts labeled A and B.
A B 10. Name the chemical substance in the parts labelled C and D C D
answers
K.C.S.E Physics Q & A - MODEL 2004PP1QN15&16
​Figure 10 show two circuits in which identical dry cells and identical bulbs are used. Use the information in the figure to answer questions 15 and 16
Explain why the bulb in Figure 10(10) will be brighter than each of the bulbs in Figure 10 (a)
Give the reason why the cells in figure 10(b) can be used for a longer period than the cells in Figure 10 (a)
answers
K.C.S.E Physics Q & A - MODEL 2004PP1QN09
State the purpose of Manganese dioxide in a dry cell
answer
State one advantage of a lead – acid accumulator over a nickel – iron (NiFe) accumulator.10/7/2020
K.C.S.E Physics Q & A - MODEL 2003PP1QN10
State one advantage of a lead – acid accumulator over a nickel – iron (NiFe) accumulator.
answer
K.C.S.E Physics Q & A - MODEL 2001PP1QN10
Explain how polarization reduces current in simple cell.
ANSWER
K.C.S.E Physics Q & A - MODEL 2000PP1QN10
State one advantage of an alkaline accumulator over a lead – acid accumulator.
ANSWER
K.C.S.E Physics Q & A - MODEL 1998PP1QN31
Fig 10 shows a fire alarm circuit
Explain how the alarm functions
ANSWER
K.C.S.E Physics Q & A - MODEL 1998PP1QN21
In the circuit in fig 5 when the switch S is closed, the voltmeter shows a reading.
When the cell terminals are reversed and the switch is closed, the voltmeter reading is zero. Explain these observations.
ANSWER
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