Physics Paper 2 Kenya High Post Mock Exams 2020 - Questions and Answers

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INSTRUCTIONS

  • This paper consists of two sections A and B.
  • Answer all the questions in the spaces provided.
  • All working must be clearly shown.
  • Mathematical tables and electronic calculators may be used.

SECTION A (25 Marks)
Answer all the questions in this section in the spaces provided.

  1. Locate the position of the image of the object placed in front of a plane mirror shown below. (2 mks)
    KH Phys PP2 Q1 Pm 2020
  2. Show the magnetic field pattern of the current carrying conductors shown below. (2 mks)
    KH Phys PP2 Q2 Post Mock 2020
  3. State two factors that determine the strength of an electromagnet. (2 mks)
  4. State two advantages of using a convex mirror as a driving mirror. (2 mks)
  5. State two factors that affects the resistivity of an electrical conductor. (2 mks)
  6. The figure below shows a wave in progress.
    Kh Phys PP2 Ans 6 PM 2020
    Determine the
    1. Amplitude (1 mark)
    2. Frequency (2 marks)
  7. The figure below shows light travelling from less dense to more dense medium.
    KH Phys PP2 Q7 Pm 2020
    1. Show the direction of the refracted ray. (1 mark)
    2. If the refractive index of the more dense medium is 1.4, calculate the angle of refraction. (3 marks)
  8. A current ,I, flowing through a wire of resistance ,R, is increased by seven times. Determine the factor by which the rate of heat production was increased. (3 marks)
  9. The wavelength of a radio wave is 1km. Determine its frequency if the speed in 3 x 108ms-1 (2 marks
  10. State two uses of gold leaf electroscope. (2 marks)
  11. Give a reason why soft iron is used as a core of the coil of an electric bell. (1 mark)
  12. State two differences between pinhole camera and the human eye. (2 marks)
  13. State two types of waves. (2 marks)

SECTION B (55 MARKS)

  1.  
    1. Define the following terms.
      1. Capacitor (1 mark)
      2. Capacitance (1 mark)
    2. Three capacitors are connected to a 10v battery.
      Kh Phys PP2 Q14 b Pm 2020
      Calculate:
      1. the effective capacitance (3 marks)
      2. the total charge (3 marks)
    3. State three factors that determine the capacitance of a capacitor. (3 marks)
  2.  
    1. Define a resistor. (1 mark)
    2. The figure below shows three resistors connected to 12v supply of internal resistance of 0.2Ω.
      KH phs PP2 Q15b PM 2020
      Calculate
      1. the effective resistance. (3 marks)
      2. the total current in the circuit. (2 marks)
      3. the current through the 4Ω resistance. (3 marks)
    3. If the current flows for 2 minutes calculate the total energy dissiparted. (2 marks)
    4. State two applications of resistors in real life situation. (2 marks)
  3.  
    1. Explain briefly how a material acquires a positive charge. (3 marks)
    2. A steel pin is placed on the cap of a highly charge electroscope.
      KH Phys PP2 Q16b PM 2020
      State and explain the observation that will be made on the gold leaf. (2 marks)
    3. State a reason why a candle flame is blown away when a highly charged metal is brought close to it.  (2 marks)
    4. Explain briefly why it is not advisable to take shelter on a tree when it is raining. (2 marks)
    5. State two dangers of electrostatic charges. (2 marks)
  4.  
    1. State two methods of magnetisation. (2 marks)
    2. Why is repulsion the surest way of identifying a magnet. (2 marks)
    3. Complete the diagram below to show the magnetic field patterns. (2 marks)
      Kh Phys PP2 Q17 c Pm 2020
    4.  
      1. The figure below in a U-shaped iron core. Indicate the polarity at X and Y. (2 marks)
        Kh Phys PP2 Q17 d Pm 2020
      2. State two applications of such an electromagnet. (2 marks)
  5.  
    1. A pin is placed at the bottom of a beaker containing a transparent liquid. When viewed from the top the pin appears nearer the surface than it actually is. Explain the observation. (2 marks)
    2. The table below shows the results obtained from such an experiment.
       Apparent depth (cm)   2.21   3.68    5.15   6.62   8.09 
       Real depth cm  3.0   5.0    7.0     9.0    11.0 
      Plot a graph of real depth against apparent depth. (5 marks)


 MARKING SCHEME

  1.  
    Kh Phys PP2 Ans 1 PM 2020
  2.  
    Kh Phys PP2 Ans 2 PM 2020
  3.  
    1. No. of turns
    2. Amount of current Max 2
    3. slope of core
  4.  
    1. Wide view
    2. Gives upright image
  5.  
    1. Length
    2. Cross sectional area
  6.  
    1. 2/100 = 0.02m
    2. F = 1/T = 1/8HZ
  7.  
    1.  
      Kh Phys PP2 Ans 7a PM 2020
    2. Sin 30° = 1.4
       Sin r°
      r = 21.4°
  8. P = VI
    = I/R
    = 7 x 7 = 49 times
  9. V = FΩ
    300000000 = f x 1000
    f = 3 x 105HZ
  10.  
    • Compare charges
    • Detect charge
  11. Easily magnetised& demagnetized
  12.  
    • Camera does not have iris to control amount of light as in the eye.
    • Pinhole no lens while eye as a lens
  13.  
    • Progressive
    • Mechanical
  14.  
    1.  
      1. A device to store charge
      2. Ability of a capacitor to store charge.
    2.  
      1. Series 1/c = 1/4 + 1/5 = 5 + 4 = 9/20
                                              20
        Parallel c = 20/9 + 3 = 20 + 9 = 29/9μf
                                              9
        = 3.2 x 10-6F
      2. Q = cv
        = 29/9 x 10-6 x 10
        = 32.2 x 10-5C.
    3.  
      • Type of dielectric material
      • Overlapping cross sectional area
      • Distance between the plates
  15.  
    1. That which opposes the flow of electrical current.
    2.  
      1. Parallel ⇔1/R = 1/3 + 1/4
        = 4 +3 = 7/12
             12
        R = 12/7
        Series 12/7 + 2 = 12 + 14
                                       7
        = 3.86Ω
      2. V = 1R
        ⇔ 12 = I x 3.86
        I = 12/3.86A
      3. Through 4Ω resistor
        = 3/7 of total
        = 3/7 x V/R
        = 3/7 x 12 x 7 A
        = 1.38A
    3. E = Pt = VIt
      = 12 x 1.38 x 2 x 60J
      = 1987.2J
    4.  
      • Radio circuit
      • Heater coils
      • Bulb filament
  16.  
    1. After rubbing two different material, one losses electrons leaving it with majority protons which are positively charged thus acquires positive charge.
    2. Leaf collapses
      • Sharp regions are good charge dischargers leaving the electroscope with no charge.
    3. Burning candles makes the air near it charged thus repelled by the charge on the metal.
    4. When lightening strikes the tree acts like an arrestor and body near it is affected.
    5.  
      • Can cause fire
      • can kill if not arrested
  17.  
    1.  
      • Electrical
      • Induction
      • Storing
    2. Because magnetic material are attracted by magnets and even unlike poles of a magnet.
    3.  
      Kh Phys PP2 Ans 17c PM 2020
    4.  
      1. X - North
        Y - South
      2.  
        • Electric bell
        • Microphones / speaker
  18.  
    1. Light from dense liquid to less dense air is refracted away thus lifting the object.
    2.  
      Kh Phys PP2 Ans 18b PM 2020

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