PHYSICS PAPER 1 - 2019 LANJET JOINT MOCK EXAMINATION

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SECTION A 25 MARKS
ANSWER ALL QUESTIONS IN THIS SECTION

  1. The figure below shows part of a vernier callipers when the jaws are closed without an object in between the jaws.
    phyc1 q1111
    1. State the zero error of the vernier callipers. (1mk)
    2. A student used the same vernier calipers to measure the diameter of a test tube of actual diameter 2.15cm. What was the reading shown by the vernier calipers(2mks)
  1. State two differences between boiling and evaporation.  (2mks)
  1. The figure below shows a u-tube containing the liquids X and Y. Given that the density of liquid X is 1.8g/cm3, calculate the density of liquid Y in g/cm3.            (3mks)
    phyc1 q333
  1. When the temperature of a gas in a closed container is raised, the pressure of the gas increases. Explain how the molecules of the gas cause the increase in pressure. (2mks)
  1. State one factor that affects the turning effect of a force on a body.                             (1mk)
  1. Draw a diagram showing the bimetallic strip after it is cooled below room temperature.    (2mks)
    phyc1 q666
  1. In a vacuum flask, the walls enclosing the vacuum are silvered on the inside. State the reason for this.                                                                                              (1mrk)
  1. A fixed mass of gas occupying 4 litres at 270c is compressed at constant temperature until the pressure is doubled. It is then cooled at constant pressure until the volume is 1litre.What is the final temperature of the gas? (3mks)
  1. Figure 4 below represents a part of a tape pulled through a ticker-timer of frequency 50Hz, calculate the acceleration of the trolley (3mks)
    phyc1 q999
  1. Jupiter’s gravitational field strength is 26N/kg what would be the weight of an object that weighs 30N on earth on Jupiter. (Take g=10N/Kg on earth) (3mks)
  1. Distinguish between speed and velocity. (1mk)
  1. When mercury in a glass thermometer is used to measure the temperature of hot water, it is observed that the mercury level first drops before beginning to rise. Explain.           (1mk)

SECTION B (55MARKS)
ANSWER ALL QUESTIONS IN THIS SECTION

  1.  
    1. State the law of conservation of linear momentum. (1mrk)
    2. The diagram below shows two stationary trolleys A and B separated by a compressed spring and held together by inextensible thread. The mass of trolley A is 2.0kg and the mass of trolley B is 0.1kg. When the thread is cut, the trolleys move rapidly apart.
      phyc111 q13bbb
      If trolley A moves off with a speed of 0.25ms-1. Calculate the speed with which trolley B moves off.                                                                                                      (4mks)
    3. A steel ball of mass 0.10kg was placed on top of a level ground. The spring was then compressed by 0.20m with an average force of 10N.
      phyc1 q13ccc
      Calculate the maximum height the ball attains (Take g=10Nkg-1)                  (4mks)
  1.  
    1. State the Archimedes principle. (1mk)
    2. A block of wood measuring 0.8m by 0.5m by 2m floats in water. 1.2m of the block is submerged.
      1. Determine the weight of the water displaced.                                   (2mks)
      2. Find the force required to just make the block fully submerged.       (3mks)
    3. A block of glass of mass 250g floats in mercury. What volume of the glass lies under the surface of mercury?     (3mks)
    4. A piece of sealing wax, weighs 3N in air and 0.22N when immersed in water, calculate the density of the wax.                                                                   (3mks)
    5. A balloon weighs 10N and has a gas capacity of 2m3. The gas in the balloon has a density of 0.1kg/m3. If density of air is 1.3kgm-3, calculate the resultant force of the balloon when it is floating in air.                 (3mks)
  1.  
    1. Explain why water is a good coolant liquid in a car’s engine cooling system.     (2mks)
    2. Water of mass 5kg initially at 180C is heated in an electric kettle rated 2.5kw. The water is heated until it boils at 980C. Taking specific heat capacity of water to be 4200Jkg-1 K-1, heat capacity of kettle = 438J/kg, specific latent heat of vaporization of water = 2.28MJ/kg .Calculate;  
      1. The heat absorbed by the water.                                                                (2mks)                                                
      2. Heat absorbed by the electric kettle.                                                         (2mks)
      3. The time taken for the water to boil.                                                        (2mks)
      4. How much longer it will take to boil away all the water into vapour.      (2mks)
  1. The figure below shows a hydraulic brake system. A force of 20 N is applied on the foot pedal connected to a piston of area 0.05m2. This causes a stopping force of 5000N on one wheel
    phyc1 q1666
    Calculate.
    1. Pressure in the master cylinder            (3mks)
    2. Area of the slave piston. (3mks)
    3. Velocity ratio of the system.            (3mks)
    4. Give two reasons why oil is used in the hydraulic brake system.            (2mks)
  1.  
    1. Define the term radian.                                                                                         (1mk)
    2. The figure below shows a car of mass (m) moving along a curved part of the road with a constant acceleration.
      phyc1 q17bbb
      1. Explain why the car is more likely to skid at B than at A.                          (1mk)
      2. If the radius of the path at B is 250m and the car has a mass of 6000kg, determine the maximum speed the car can be driven while at B without skidding. The coefficient of friction between the roadand the tyre is 0.3.                               (3mks)                                                                                 
    3. A string of length 70cm is used to whirl a stone of mass 0.5kg in a circle of vertical plane at 5 rev/s. Determine:
      1. The period.                                                 (2mks)                                                                     
      2. The angular velocity                                                 (3mks)                                                         
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