K.C.S.E Physics Q & A - MODEL 2001PP2QN02
​ a) Fig 1 (a) shows the circuit of a simple telephone receiver. When the telephone is lifted, a steady current flows through the solenoids. When a person speaks into the microphone on the other side, a varying current flows. These two currents are shown in fig. 1(b).
​i) State the reason why solenoids are wounds in opposite directions around the soft-iron core pieces as shown.
ii) Explain how the speech current from the microphone is converted into sound in the receiver. iii) State and explain the effect of replacing the soft iron core pieces with steel core pieces. ​b) A step down transformer has 400 turns in the primary coil and 20 turns in the secondary coil A 50 ohms resister is connected to the secondary output. If the r.m.s (root-mean-square) value of the primary voltage is 240; determine the peak value of the current in the in the secondary circuit.
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K.C.S.E Physics Q & A - MODEL 2001PP2QN01
A block of ice of mass 40g at 0C is placed in a calorimeter containing 400g of water at 20C .Ignoring the heat absorbed by the calorimeter, determine the final temperature of the mixture after all the ices has melted. (Specific latent heat capacity of fusion of ice= 340,00J/kg, specific heat capacity of water = 4,200j/kg).​
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K.C.S.E Physics Q & A - MODEL 2001PP1QN34
​The following reaction is part of a radioactive series:
​Identify the radiation r and determine the values of b and c.
answer
State the factor that determines the hardness of the X – rays produced in an X – ray tube.9/7/2020
K.C.S.E Physics Q & A - MODEL 2001PP1QN33
State the factor that determines the hardness of the X – rays produced in an X – ray tube.
answers
K.C.S.E Physics Q & A - MODEL 2001PP1QN32
A 60W bulb is used continuously for 36 hours. Determine the energy consumed. Give your answer in kilowatt hour (kWh).
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