(a) State the basic law of magnetism.              (1 mk)

(b) The figure below shows how magnets are stored in pairs with keepers at the ends.

Explain how this method of storing helps in retaining magnetism longer.      (2 mks)

The figure below shows an object O placed infront of a plane mirror.

On the same diagram, draw rays to locate the position of the image I as seen from the eye E.  (2 mks)

The figure below shows a sharp pin fixed on a cap of leaf electroscope.  The electroscope is highly charged and then left for sometime.

Explain why the leaf collapses.                         (2 mks)

State the property of light suggested by the formation of shadows.             (1 mk)

a) The figure below shows a block of mass 25g and density 200kg/m³ submerged in a certain liquid and      suspended from a homogenous horizontal beam by means of a thread. A mass of 2kg is suspended from the beam as shown in the figure below.

(i) Determine the upthrust force acting on the block.         (3 mks)

(ii) Calculate the density of the liquid.             (3 mks)

       b) i) State the law of floatation.          (1 mk)

ii) The figure below shows a piece of aluminum suspended from a string and completely immersed in a container of water. The mass of the aluminium is 1kg and its density is 2.7 ×  103kg/m³

Calculate the tension in the string.          (3 mks)

A mass of 1kg is attached to a cord of length 50cm. It is whirled in a circle in a vertical plane at 10 revolutions per second as shown in the figure below.

(a) Find the tensions in the cord when the mass  is at:

 i) Highest point of the circle A.          (2 mks)

 ii) Lowest point of the circle B.          (2 mks)

(b) i) Describe an experiment to determine specific heat capacity of aluminium block with two holes drilled in it to accommodate a thermometer and an electric heater.      (5 mks)

ii) An immersion heater rated 90W is placed in a liquid of mass 2kg. When the heater is switched on      for 15minutes, the temperature of the liquid rises from 20⁰C to 30⁰C. Determine the specific heat capacity of the liquid.            (3 mks)

a) i) Distinguish between inelastic and elastic collisions.            (2 mks)

 ii) A particle A of mass M moving with an initial velocity, u, makes a head-on collision with                another particle B of mass 2M, B being initially at rest. In terms of u, calculate the final velocity of A if the collision is perfectly inelastic.              (3 mks)

b) The diagram in Figure 5 below shows a sphere moving in a viscous liquid in a tall measuring      cylinder.

i)     Show on the diagram the forces acting on the sphere.        (3 mks)

  ii) Sketch a graph showing the variation of velocity with time in figure 6 below. Show on the graph the terminal velocity, VT.              (2 mks)

a) i) What is Brownian motion?              (1 mk)

 ii) Describe with the aid of a diagram, the apparatus you could set up in order to demonstrate Brownian motion of smoke particles suspended in air.              (5 mks)

b) An oil drop has a volume of 0.01mm³ when it is placed on the surface of some water, it spreadsout to form a circular patch of area 500cm²

i) Calculate the thickness of the oil film.            (3 marks)

ii) What two assumptions have you made in the answer b(i) above.         (2 marks)

A student in Tipu Girls set up an experiment to study the acceleration of a trolley using ticker tape timer. The timer made 50 dots per second on the tape. Dots A to E measured 2.5cm apart and dots E

to I measured 4.5cm apart.

(a) Using a scale drawing show the dots A, B C, D, E, F, G and I as they appeared on the tape. (3 marks)

(b) Determine the velocity of the trolley from:

 i)A to E.                                             (2 mks)

 ii) E to I.                                        (2 mks)

(c) Calculate the acceleration of the trolley.                                    (2 mks)

(d) What end of the tape was fixed onto the trolley?              (1 mk)

(e) State two precautions that the student should take before she takes her final samples of the dots. (2 mks)

State the reason why a trailer carrying heavy loads has many wheels.      (1 mk)