IGCSE Physics
CIE IGCSE Physics Solved Past Paper May/June 2020 P43

CIE IGCSE Physics Solved Past Paper May/June 2020 P43

  b i) constant acceleration

   ii) increasing acceleration

   iii) deceleration

   iv) constant speed

2a) mass = density*volume

      Volume = 0.3*0.3*0.4=0.036m3

      Mass = 1020*0.036=37kg

b i) pressure due to depth = 500k-100k=400k Pa

                                Depth = pressure/density*gravity



ii) force = pressure*area

              = 500k*0.62                

              = 3.1*10^4N

3a) line of action of center of mass falls out of base of bus

  b) less stable as center of mass of bus falls out of base of bus

c i) mass of passengers = 73*65=4745

                     Total mass = 4745+1600=21000kg

  ii) force = mass*acceleration


               = 15000N

4a) more energetic molecules escape from the surface leaving behind less 

      energetic molecules.Average kinetic energy of liquid decreases and as a 

      result temperature of remaining liquid drops

  b) more wind, higher temperature of air

5 ai)  energy = power*time

                     = 50*2*60

                     = 6000J

ii)   specific heat caoacity = 6000/0.55*13

                                          = 840J/kg ?

iii) some heat from heater lost to surroundings so actual value might be 


b) water has higher specifi heat capacity and since same rate of energy 

    is supplied to both sand and sea,increase in temperature is not as much 

    that of the sand                 

6a) with normal perpendicular to surface, angle of incidence = angle of


c) 1500m/s

7a) angle of incidence = angle between normal and the incident ray

       So angle of incidence = 90-40=50

                Refractive index = sin i/sin r

                                  Sin r =sin i/n

                                        r = sin-1(0.32) = 18

b) when all the light travelling from an opticall denser medium to an 

    optically rarer medium is  reflected for which the angle of incidence is  

    greater than the critical angle

c) light reflected from surface one as angle of incidence is greater than 

    critical angle light from surface 2 bends away from normal as it is 

    Travelling from a denser to rarer medium

8 ai) electric field is the area where a charge experiences a force

   ii) it is the direction of chage on a positive charge

   b) the ball after moving first touches either of the plates in case it touches 

       the positive plate, it gains positive charge through the layer of 

        conducting metal on its surface. It is then repelled away from the

      positive plate and towards the negative plate.

  c) charge = current*time 

          time = charge/current 

                 = 15/0.29 = 52 seconds

9 ai) in this question fleming’s left hand rule is applied so by having the 

          pointer finger, middle finger and the thumb in perpendicular positions

          to each other, pointer indicates magnetic field with the middle finger 

          indicating the conventional current direction, the thumb represents 

          Direction of force, which is downward on left side of coil.

          This means the coil turns anti-clockwise

     ii) from negative to positive terminal

    iii) electrons repelled from the negative terminal of supply

   b i)  turns in opposite direction

     ii) turns faster

    iii)  turns faster

10 ai) beta particle

b i) background radiation of rocks

 ii) 11400/5700 = 2 half lives have passed so that means after subtracting    

      background radiation from 80 and 20, counts are 70 and 10.

     This means that if statement of question is right, after reducing 70 by

     half, twice(because two half lives) the amount should be around 10 but:

     70/2=35/2=17.5>10 as this amount is greater than that suggested by

     question, this means that age of sample is more than 11400 years as it   

     needs more than just 2 half lives to decrease from 70 to 10.

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