Physics Paper 1 Questions and Answers - Bungoma Diocese Mock Exams 2021/2022

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INSTRUCTIONS TO STUDENTS

  • Attempt ALL questions in sections A and B.
  • All your answers must be written in the spaces provided in this question paper.
  • All working must be clearly shown
  • Non programmable silent electronic calculators and KNEC mathematics table may be used except where stated otherwise

SECTION A (25 MARKS)
Answer all the questions in this section

  1. Figure 1 below shows a scale of vernier calipers when measuring the width of a meter rule.
    Phys BDM PP1 Q1 2122
    What is the actual width of the meter rule if the calipers has a zero error of + 0.6mm.? (2mks)
  2. A clinical thermometer has a constriction in the bore just above the bulb. State the use of the constriction. (1mk)
  3. Figure 2 below shows air trapped by a column of t6he mercury in a U-tube . The atmospheric pressure is 76 cm Hg.
    Phys BDM PP1 Q3 2122
    At what pressure in mmHg is the enclosed air? (3mks)
  4. A girl of mass 50 Kg runs up a flight of height 4m in 4 seconds . Calculate the power she developed in this time (2mks)
  5. Name the transducer in the following energy conversions.
    1. Kinetic to electrical (1mk)
    2. Solar to heat (1mk)
  6. Figure 3 below shows dots produced on a tape pulled through a ticker timer by a moving body.
    Phys BDM PP1 Q6 2122
    The frequency of the ticker –timer is 50 Hz. Calculate the acceleration of the body. (3mks)
  7. Figure 4 below shows an ammeter used to measure current through the conductor .The student used the lower scale.
    Phys BDM PP1 Q7 2122
    State the reading from the meter (1mk)
  8. Figure 5 below shows a uniform rode AE which is 40 cm long. It has a mass of 2Kg and pivoted at D. If 2N is acting at point E , and 30N force is passed through a frictionless pulley.
    Phys BDM PP1 Q8 2122
    Find the force X acting at end A. (3Mks)
  9. Convert -200°C into Kelvins (1mk)
  10. Figure 6 below shows two identical springs constant 3N/cm supporting a load of 30N.
    Phys BDM PP1 Q10 2122
    Determine the extension of each spring (3mks)
  11. Explain why a bus should not carry standing passengers. (1mk)
  12. State TWO reasons mercury is preferred as a barometric liquid and not water . (2mks)

SECTION B (55MARKS)
Answer all questions in this section
 

  1.  
    1. Define the term efficiency as used in machines . (1mk)
    2. Figure 7 below shows the cross –section of a wheel and axle of radius 6.5 cm and 1.5 cm respectively used to lift a load. Use it to answer the question that follow.
      Phys BDM PP13 Q1 2122
      Determine the
      1. Mechanical advantages (M.A) of the system (2mks)
      2. Velocity ratio (V.R) of the system (2mks)
      3. Efficiency of the machine (2mks)
      4. Give one reason why the above machine is not 100% efficient (1mk)
    3. State the law of conservation of energy (1mk)
  2.  
    1. In inelastic collision , kinetic Energy is lost .Explain . (1mk)
    2. A Trailer of mass 30 tonnes travelling at a velocity of Km/ her rams onto a stationery bus of mass 10 tonnes . The two move together after impact. Determine the common velocity at which they move after impact. (3 Mks)
    3. A stone is thrown vertically upward with an initial velocity of 30 M/s
      1. Determine the maximum height reached. (2mks)
      2. Time taken to come back to the point of projection (2mks)
    4. The figure 6 below shows a body being pulled by a constant force of 10N for 4m over wooden surface . The co- efficient of friction is 0.03.
      Phys BDM PP1 Q14 2122
      Find the acceleration of the body (3mks)
  3.  
    1. State Hooke’s law (1mk)
    2. A graph of force (y-axis) against (x-axis) is provided. Use it to answer questions below.
      Phys PP1 Q15 BDM 2122
      From the graph determine;
      1. Work done in stretching the spring by 3cm. (3mks)
      2. Spring constant .Give your answer in SI Units. (3mks)
      3. State two factors that affect the spring constant. (2mks)
  4.  
    1. Give reason why ink is likely to ooze a pen when one is up in an airplane. (1mk)
    2. The figure below is a simple hydraulic machine used to raise heavy loads.
      Phys BDM PP1 Q16 2122
      Calculate;
      1. The pressure exerted on the oil by the force applied at A (2mks)
      2. The load raised at B (2mks)
      3. Give two properties which make the oil suitable for use in this machine . (2mks)
    3. The barometer reading at the base of the mountain is 60cm/ Hg while at the top is 50 cm/Hg. If the densities of air and mercury are 1.25kgm-3 and 13,600kgm-3 respectively. Calculate the height of the mountain. (3mks)
  5.  
    1. Distinguish between streamline and turbulent flow. (2mks)
    2. Figure below shows two light sheets of paper arranged as shown
      Phys BDM PP1 Q17 2122
      Explain the observation made when air is blown at the same time at point A and B. (2mks)
    3. Figure 12 below shows an incompressible fluid moving through a tube of varied cross-section area. If the area of the small tube is 0.05m2, Calculate the area of large tube in cm2. (3mks)
      Phys BDM PP1 Q17c 2122
    4. State the Bernoulli’s principle (1mks)
    5. State any TWO assumptions made when deriving the equation of continuity (2mks)
  6.  
    1. State the principal of moments (1mk)
    2. A uniform metal strip is 3.0cm wide, 0.5 cm thick and 100 cm long. The density of the metal is 2.7 g/cm3. Determine
      1. The weight of the Metal strip. (2mks)
      2. The strip is placed on a pivot and kept in equilibrium by forces in the figure below.
        Phys BDM PP1 Q18b 2122
      3. Determine the value of F . (3mks)


MARKING SCHEME

SECTION A

  1. MSR = 6.90cm
    VSR = 0.04cm
    = (6.90+ 0.04) cm
    Actual width = 6.94cm-0.06
    = 6.58cm                               2 marks
  2. It prevents the return of the mercury to the bulb when the thermometer is removed from the body to the surrounding
    1mark
  3. Pressure = Press. Due to atm. + press. due to liquid column
    = (76+50) cmHg
    = 126cmHg OR 1260mmHg                 3 marks
  4. Power = work done = mgh
                      Time          Time
    Power = 50 x 10 x 4
                           4
    Power = 500W                2 marks
  5.  
    1. Dynamo       1 mark
    2. Solar panel          1 mark
  6. V =   5    = 250 cm/s
          0.02
    U =   2    = 100m/s
           0.02
    a= v−u
            t
    a = 250 −100
              0.06
    a = 2500cm/s² or 25cm/s²                 3 marks
  7. Reading =1.35 A           1mark
  8. 30 x 20 + 10 x 2 = 30 x +10W
    600 + 20 =30X +200
    620 = 30X +200
    X = 14N                 3MKS
  9. −200 + 273=73K Working must not be shown     1 marks
  10. e = F
    e =  30 
          2×3
    e =5cm     3marks
  11. Standing passengers raise the center of gravity making the bus unstable
  12.  
    • Mercury has a higher density than water
    • Mercury does not stick on walls of the glass       2mks

SECTION B

  1.  
    1. Efficiency is the ratio of work done on the load(work output) to the work done by the effort(work input) expressed as a percentage   1mk
    2.  
      1. MA = L
                 E
        MA= 150
                  50
              = 3                 2mks
      2. VR = 2πR
                  2πr
        VR = 2π x 6.5
                  2 π 1.5
        = 4.333    2mks
      3. efficiency = MA X100
                           VR
        efficiency =    3    x 100
                           4.333
                        = 69.23%                           2mks
      4. the friction between the moving parts               1mk
    3. The sum of kinetic energy and potential energy of a system is constant
      Or
      Energy can neither be created nor destroyed but can only be changed from one form to another   1mk
      9 marks
  2.  
    1. The bodies undergo deformation
      OR
      Some of the energy is transformed to heat, sound or light    1mk
    2. M1v1 + m2v2 = v(m1 + m2)
      30000 x 20 + 10000 x 0 = v(30000 + 10000)
      600000 = v(40000)
      V = 15m/s      3mks
    3.  
      1. hmax =
                    g
        hmax = 30²
                     10
                 = 90m                    2mks
      2. T = 2u
               g
        T = 2 x 30
                10
            = 6s      2mks
    4. Fr = µR
      Fr = 0.03 x 5x 10
          =1.5N
      Resultant force = 10 − 1.5
          = 8.5N
      F = ma
      8.5 = 5a
      α = 1.7m/s²       3mks
      11mks
  3.  
    1. For a helical spring or any other elastic material, extension is directly proportional to the stretching force provided the elastic limit is not exceeded   1mk
    2.  
      1. work done = area under the graph
        Work done = ½ Fe
        Work done = ½ x 6 x 0.06
                          = 0.18j               3mks
      2. spring constant = gradient of the graph
                                 =     Δ  force     
                                     Δ Extension
                                 =    6 − 0   
                                    0.06 − 0
                                 = 100N/m                  3mks
      3.  
        • Nature of the material of the spring
        • Thickness of the wire of the spring
        • The diameter of the spring
        • The number of turns per unit length    2mks
  4.  
    1. There is low atmospheric pressure hence the ink pressure in the pen is higher, forcing the ink out   1mk
    2.  
      1. p = force
               Area
        p =  120  
              0.006
        p = 20000 pa     2mks
      2. 20000 =
                     0.5
        Load = 10000N      2mks
      3.  
        • Oil is incompressible
        • The oil does not corrode the parts the machine
        • Have a high boiling point and a low freezing point    2mks
    3. Pressure due to air column = Pressure difference
      haęag = hmęmg
      ha = hₘęₘ
               ęa
      ha = 0.1x13600
                   1.25
           = 1088m    3mks
        10mks
  5.  
    1. Streamline flow is a flow in which all particles of the fluid at a point in a tube of flow are travelling at the same velocity and same direction while turbulent flow is a flow in which particles at a point move with different speeds and in different direction.   2 mks
    2. The papers move away from each other, the fast moving area reduces the pressure; the atmospheric pressure in between the papers pushes them apart     2 mks
    3. A1v1 = A2 V2
      A1  = 0.056 X 2.5
                      0.6
            = 0.233cm²    3mks
    4. Provided the fluid is non - viscous, incompressible and flowing steadily, an increase in speed of the fluid produces a corresponding decrease in pressure.    1 mks
    5.  
      1. the fluid in incompressible
      2. the fluid is non - viscous
      3. the flow is streamlined   Any 2 x 1 = 2mks
        10 marks
  6.  
    1. For a system in equilibrium, the sum of clockwise moments must be equal to the sum of ant - clockwise moments at a point of support.
    2.  
      1. w = 0.03 x 0.005 x 2700 x 10
        W = 4.05N     2mk
      2. Sum of clockwise moments - sum of the anticlockwise moments
        20 x F = 15 x 4.05
        F = 3.0375 N      3mks
        06 marks

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