Name

SECTION A (25MKS)1. Figure 1 shows a micrometer with a negative error of 0.02 mm, used to measure the diameter of a ball bearing.

Record the diameter of the ball

(2mks) *Kyo*2. Explain the washing effects of detergents of soap and why detergents in warm water washes greasy clothes even better

(2mks) *Kyo*3. State the reasons why concrete beam reinforced with steel does not crack when subjected to changes in temperature

(1mk) *Kyo*4. Figure 2 shows a uniform bar 2m long in equilibrium, acted by forces as shown.

Determine the weight of the bar

(3mks) *Kyo*5. The diagram below shows two bulbs P and Q painted white and black

Explain what happens when the heater is turned on?

(2mks) *Kyo*6. The figure below shows the path taken by a fluid flowing from region A to C

Explain the looping at B

(1mk) *Kyo*7. A car of mass 1000kg traveling at 36km/h is brought to rest over a distance of 20m. Find

(i)The acceleration

(2mks) *Kyo*(ii)The breaking force in Newtons

(1mk) *Kyo*8. A carbon dioxide cylinder contains 300cm3 of gas at a pressure of 2.40(107 pa. Atmosphere pressure is 1.01(105 pa. Calculate the volume of the gas at atmospheric pressure

(2mks) *Kyo*9. Figure 4 below shows a cambered wheels

1mk*Kyo*

What is the advantage of these?

10. The diagram below shows a water tank of height h?

What is the relationship between the velocity V of the water jet and the height h (2mks) *Kyo*11. A cylindrical container has a base area of 150cm2 and is filled with water to a depth of 25cm. Find the pressure due to water on the base

(2mks) *Kyo*12. Figure 6 shows the motion of steel ball released at A in a cylinder containing glue

Sketch distance time graph for the velocity from B to C

(2mks) *Kyo*13. Figure 7 shows two plastic bottles jointed base-to-base using glue.

State and explain the observation when air is pumped in?

(2mks) *Kyo*14. Why are wire shelves used rather than solid shelves in the centre of a refrigerator? (1mk) *Kyo*SECTION B (55 MARKS)

Answer all questions in this section

15. (a)An object is released to fall vertically form height of 100m. At the same time another object is

projected vertically upward with velocity of 40m/s.

(i) Calculate the time taken before the objects meet

(3mks) *Kyo*(ii) At what height do the objects meet?

(2mks) *Kyo*(b)A stone is projected horizontally at a speed of 40m/s from a cliff 60m high. After how long will it strike the ground?

(2mks) *Kyo*(c)A string of negligible mass has a bucket tied at the end. The string is 60cm long and the bucket has a mass of 45g. The bucket is swung horizontally making 6 revolutions per second. Calculate

(i)The angular velocity

(1mk) *Kyo*

(ii)The angular acceleration

(2mks) *Kyo*

(iii)The tension on the string

(2mks) *Kyo*

(iv)The linear velocity

(1mk) *Kyo*16. (a)A block metal weighted 60N in air and 50N when completely submerged in water of density

1.0g/cm3

(i)Calculate the density of the metal block

(2mks) *Kyo*(ii)Calculate the upthrust on the metal and the apparent weight of the metal when completely submerged in slat solution of density 1.2g/cm3

(3mks) *Kyo*(b)A machine with a wheel of diameter 1.2m and an axle of diameter 0.4m lifts a lot of mass 9kg with an effort of 100N. Given that the acceleration due to gravity is 10m/s2 calculate.

(i)The velocity ratios of the machine

(1mk) *Kyo*

(ii)The mechanical advantage of the machine

(1mk) *Kyo*(iii)The efficiency

(2mks) *Kyo*(c)Draw a well labeled diagram of a pulley system with a velocity ration of 3 showing application of load and effort

(2mks) *Kyo*17. (a)Define the terms

(i)Inelastic collisions

(1mk) *Kyo*(ii)Momentum

(1mk) *Kyo*(b)A bullet of mass 20g moving with a velocity of 1000m/s hits stationery antelope of mass 12kg. The bullet imbeds and the two move in one direction. Calculate its final velocity(2mks) *Kyo* (c)Block of mass 200g rests on a rough horizontal table. A force of 0.6N pulls the block so that it moves with a constant acceleration of 1m/s2 calculate

(i)The time it takes to travel a distance of 200m

(2mks) *Kyo*

(ii)The frictional force between the block and the table

(2mks) *Kyo*

(iii)The coefficient of kinetic friction between the two forces

(2mks) *Kyo*

(iv)A part from the normal reaction and frictional force, name any other force(1mk) *Kyo*18. (a)(i) State a reason why clinical thermometer is a special thermometer (1mk) *Kyo*(ii) Complete the clinical thermometer shown, giving its temperature range (2mks) *Kyo*

(iii) State three difference between boiling and evaporation

(3mks) *Kyo*(b)(i) Define specific latent heat of fusion

(1mk) *Kyo*(ii) A copper calorimeter of mass 25g contains water of mass 150g at 60oC. Then ice of mass

30g at 60oC is added to water, melted and well stirred until the temperature of 38 oC is attained. Calculate the specific latent heat of fusion of ice.

(4mks) *Kyo*19. (a) (i) State Boyles Law

(1mk) *Kyo*(ii) Draw a well labeled diagram of the apparatus you would use to verify Boyles Law

(2mks) *Kyo*(iii) Describe how you would use the apparatus to verify Boyles Law. (4mks) *Kyo*(b)A gas occupies a volume of 4.0 liters when its temperature is 20 oC and its pressure is 76cm of mercury. It the temperature of the gas is raised to 80 oC and its pressure is increased to 180cm of mercury. Calculate the new volume occupied by the gas.

(3mks) *Kyo*P White

heater

Q Black

Y

X

Friction

Push

To pump

Air chamber

A

B

C

D

Fig 2

PAGE 1 The Keiyo District Examination Committee 2006 232/1 Physics Turn over