Physics Paper 2 Questions and Answers - Pavement Pre-Mock Exams 2021/2022

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INSTRUCTIONS TO CANDIDATES

  • This paper consists of 20 questions.
  • Answer ALL the questions in the spaces provided.
  • ALL working MUST be clearly shown.
  • ALL numerical answers MUST be expressed in decimal forms.
  1. A form one student was investigating the brightness of bulbs when set up in circuits. He used identical bulbs and cells.
    Phys PP2 Q1 PVPM 2122
    State and explain which set up had the brightest bulb (2 marks)
  2. Distinguish between hard and soft magnetic materials. (2 marks)
  3. The figure below shows two mirrors M1 and M2 arranged parallel to each other
    Phys PP2 Q3 PVPM 2122
    O is an object placed in between the mirrors. The eye observes infinite number of images in M1 explain the observation. (2 marks)
  4. The figure below shows a ray of light through a transparent material placed in air
    Phys PP2 Q4 PVPM 2122
    Calculate the refractive index of the transparent material. (2 marks)
  5. An electric heater is found to have a resistance of 950Ω when operating normally on a 240 V mains. Find the power rating of the heater. (2 marks)
  6. Peter and John are 12m and X metres respectively away from a wall as shown peter claps his hands once. John hears the echo 0.45s later. Calculate the distance between John and Peter Speed of (sound in air =330 m/s)
    (3 marks)
    Phys PP2 Q6 PVPM 2122
  7. Calculate the effective resistance of the network from X to Y (4 marks)
    Phys PP2 Q7 PVPM 2122
  8. A small electric motor takes a current of 5A from a 200V mains supply. Calculate the resistance offered by the motor and power consumed in watts. (3 marks)
  9. The figure below shows the direction of current in a conductor. Sketch on the diagram the magnetic field pattern due to the current. (2 marks)
    Phys PP2 Q9 PVPM 2122
  10.  
    1. In the set up below the vertical displacement of the coin as seen from the liquid surface is 4cm. Determine the refractive index of the liquid used. (3 marks)
      Phys PP2 Q10 PVPM 2122
    2. Determine the critical angle for a ray travelling from the liquid above to air (2 marks)
    3. Name the conditions necessary for total internal reflection to occur (2 marks)
  11. The circuit below was used to investigate how the current passing through Q varied with p.d applied across its ends.
    Phys PP2 Q11 PVPM 2122
    Indicate on the diagram the position of ammeter and voltmeter (2 marks)
  12. When a highly positively-charged rod is brought from high position towards a negatively charged electroscope, it is observed that the leaf divergence first decreases and then rises as the rod nears the cap. Explain. (2 marks
  13. A charge of 360 Coulombs pass in a circuit in 15 minutes. Calculate the size of current supplied during that period? (2 marks)
  14. Determine the speed of light in water given that the speed of light in air is 3.0 × 108 ms-1 and the refractive index of water is 1.33 (3 marks)
  15. An object is placed 50cm in-front of a concave mirror of focal length 20cm. Determine by calculation the position and nature of the image formed. (3 marks)
  16.  
    1. Name a device that would convert kinetic energy into electric energy    (1 mark)
    2. The filament of an electric lamp is made of tungsten. Why is tungsten the suitable material? (2 marks)
    3. A current of 2A flows in a resistor for 10 minutes, 1500j of electric energy is dissipated. Determine
      1. The voltage across the resistor (2 marks)
      2. The total resistance of the resistor in ohms (2 marks)
  17. A current I passing through a coil when the P.d across it is V as measured on a voltmeter for which allowance was not made when the reading was taken
     I(A)   0.05   0.20   0.35   0.50   0.65 
     P.d(v)   0.85    2.8    4.75    6.70    8.65 
    Plot a graph of V against I and use it to determine (4 marks)
    1. The resistance of the coil (2 marks)
    2. The Zero error of the voltmeter (1 marks)
    3. The correct value of the first P.d measured. (1 mark)
  18.  
    1. State Ohms’ law (1 mark)
    2. From the circuit diagram below
      Phys PP2 Q18b PVPM 2122
      Determine
      1. The current through the 30Ω resistor (2 marks)
      2. The total current in the circuit (2 marks)
      3. The total resistance in the circuit (2 marks)
      4. The total P.d in the circuit (2 mark)
  19. The figure below shows a coil of wire WXYZ situated between the poles of a permanent magnet. The coil is pivoted about the line PQ and carries a current I
    Phys PP2 Q19 PVPM 2122
    1. Which of the sides of the coil WX, WX, YZ and ZW experiences a force? (2 mark)
    2. Which way will the coil begin to rotate? (1 mark)
    3. Give four methods by which you would increase the size of the force on the coil. (4 marks)
    4. State the effect on the coil of interchanging the poles of the magnet. (1 mark)
  20.  
    1. Draw a diagram to show the formation of a solar eclipse (2 marks)
    2. Explain how a single observer may see both a partial and total eclipse of the sun while remaining at the same place on earth (2 marks)
    3. What change would be necessary for an observer to see an annular eclipse. (1 mark)


MARKING SCHEME

  1. B- more current was supplied by the batteries to a low resistance circuit.
  2. Hard magnetic materials are difficult to magnetize though they retain the magnetism for a longer period. Soft magnetic materials are easily magnetized but don’t keep it for a longer period.
  3. This is because of multiple reflection of the object and its image on each mirror
  4. n =    1    
          sin C
      =    1    
         sin 41
      = 1.524
  5. P =
           R
        = 240 × 240
               950
       = 60.63 W
  6. Distance = 12 × 2 + x
                   = (24 +x) m
                   = 330 × 0.45 = 24 + x
         148.5 = 24 – x
               x = 124.5 m
  7. 3.5 + 5×4 + 4 = 7.5 + 20
             5+4                    9
                         = 9.72Ω
  8. R = 200
             5
         = 40Ω
    P  = VI
        = 200 × 5
         = 1000W
  9.  
    Phys PP2 Ans9 PVPM 2122
  10.  
    1. ɳ =     Real depth    
            Apparent depth
      9  
         9-4
      = 1.8
    2. C = sin−1  (1)   
                       (1.8)
      = sin−1 (0.5556)
    3.  
      • the critical angle must be exceeded
      • the light ray must be coming from a denser medium to a rarer medium
  11.   
    Phys PP2 Ans11 PVPM 2122
  12.  the majority negative charges are first attracted to the cap leading to a decrease in divergence, then minority positive charges are repelled. This leads to increase in divergence
  13. I = Q/t  
      360  
       15×60
    = 0.4 A
  14. v = 3.0 ×108
             1.33
    = 2.26 ×108m/s
  15. 1/f = 1/u + 1/v 
    1/v = 1/201/50 = 0.03
    v = 33.33 cm
    The image is - real, diminished and inverted
  16.  
    1. generator
    2. has a high resistance and melting point
    3.  
      1. 1500 = V × 2 × 10 × 60
              V = 1.25V
      2. R = 1.25²
              1500
           = 0.00104 Ω
  17.  
    Phys PP2 Ans18 PVPM 2122
    1. Gradient = 0.85 − 0.2 = 1.3 Ω
                          0.5 − 0
    2. 0.2 V
    3. 0.65 V
  18.  
    1. the current flowing ia a circuir is direcly proportional to the potential difference across it provided temperature and other factors are kept constantt
    2.  
      1. 1/3 × 3=1 A
      2. 3 +1 = 4 A
      3. R = 28 +10 × 30 = 35.5Ω
                          40
      4. V = 4 × 35.5
           = 142 V
  19.  
    1. WZ and XY
    2. anticlockwise
    3.  
      • increase the current
      • use stronger magnet
      • increase the number of turns
      • making sure that the coils are perpendicular to the magnetic field lines
    4. the coil rotates in the opposite direction
  20.  
    1.  
      Phys PP2 Ans20 PVPM 2122
    2. it is possible since moon is rotating/moving. The shadow “moves”
    3. when the moon is far from the earth, the moons shadow is usually short and doesn’t reach he earth.
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