COVID-19 end of Form two revision paper

SECTION A ( 25 marks) 

1. State the reading in seconds indicated on the digital stopwatch shown in the figure below .

(1 mark)

2. Mechanics is one of the branches of physics. State what it deals with. (1 mark)

3. State principle of transmission of fluids (1 mark)

4. The figure below shows a manometer connected to a gas supply.

The atmospheric pressure is 76cmhg. Calculate the pressure of the gas in mmhg.(2 marks) 

5. The figure blow shows a patient standing in front of a mirror.

Find the distance between her and the image of the chart.

6. Explain why soft iron cannot be used to make permanent magnets. (1mark)

7. A coil of insulated wire is wound around a soft iron core XY and connected to a battery as shown in the figure below.

State the polarities of ends X and Y.

X………………………………………….Y …………………………………(1mark)


8. Define the Centre of gravity of a body. ( 1mark)

9. The figure below shows a tractor used in a rough road

   State with a reason the point among ABCD at which the COG will be safest. (2marks) 

10. State two practical applications of stability. (2 marks)

11. Define Principal focus of a concave mirror. ( 1mark)

12. A uniform one metre rod is balanced on a knife edge by a force of 50N placed 10cm from one end shown in the figure below.

Determine the weight of the rod. (3 marks)

13. A concave mirror of focal length 15cm has an object on its axis 20cm away from the mirror. If the object is 1cm high, detrmine by scale drawing;

(a) The image distance from the mirror (3marks)
(b) The size of the object (2marks)

14. The diagram below shows sound waves passing through air. Study it and answer the questions that follow.  

Label the following on the diagram: (3 marks) 

i. Compression
ii. Rarefaction

iii Wavelength 

   

SECTION B 

15. (i) State Hooke’s law ( 1 mark)

(ii) The graph below represents relationship between extension (cm) and weight (N) suspended on a spring

(b) State with a reason which point shows the elastic limit of the spring . (2 marks) 

( c) Determine the spring constant of the spring (3 marks)

(d) State two factors that affect the spring constant of a spring. (2 marks)
(e) State and explain the observation made on the extension of the spring when a weight of 5N is suspended on the spring and then removed. (2 marks)

(f) A single spring extends by 4.8 cm when supporting a load of 144 N. Find the extension of the arrangement below if the springs are identical and of negligible weight. (3 marks)

16. A small electromagnet, used for lifting and then releasing a small ball, is made in the laboratory as shown in the figure below.

(a) Explain why an iron nail is better material than steel to use for the core. ( 1 mark)

(b) In order to lift a slightly larger ball, it is necessary to make a stronger electromagnet.  State two ways in which the electromagnet could be made powerful. ( 2marks)

(c) Figure below shows a simple electric device

(i) Identify the device (1 mark)

(ii) Name the parts labeled (2 marks)

 A...........................   B................................

(iii) When the switch is closed, the hammer hits the gong repeatedly.

Explain why.

I. The hammer hits the gong ( 2 mark)

II. The hammer hits the gong repeatedly ( 2 mark)

17. (a) State one difference between the way sound waves and electromagnetic waves are transmitted. ( 1 mark

(b) Figure below shows a transverse wave travelling along x-axis.

    

(b) Figure below shows a transverse wave travelling along x-axis.
(i) Determine the:

      I. Wavelength of the wave (1 1mark)

      I. Amplitude of the wave ( 1 mark)

(ii) If the time taken by the wave to move from O to A is 0.02 seconds, determine the:
     I. Frequency of the wave (3 marks)

     II. Speed of the wave (3 marks)

(iii) A girl standing 600 m away from a cliff bangs two pieces of wood together and hears an echo 3.5 seconds later. Determine the speed of sound in air at that place. (3 marks)

18. The figure 8 below shows an experimental set up for estimating the diameter of an oil molecule.

a) Describe how the oil patch is formed (3 Marks)

i)In this experiment the diameter ‘d’ of the oil patch was measured to be 21cm for an oil drop of radius 0.28mm. Determine the diameter of the oil molecule. (3 marks)

ii) State any two assumptions made in calculating the diameter of the oil molecule. (2 Marks)

b) Identify powder A and states its role in the experiment. (2 Marks)

19 . (a) State and explain two types of fluid flow (2 marks)

(b ) State two assumptions made in deriving the equation of the continuity (2 marks)

(c) The figure below shows a tube of varying cross- section area. represent the speed of water as it flows steadily through the sections of the tube

        

Arrange the speeds in decreasing order starting with the highest. (1 mark)

(d) A pipe of radius 6mm is connected to another pipe of radius 9mm. If water flows in the wider pipe at the speed of 2ms-1, Calculate is the speed in the narrower pipe. ( 3 marks)

COVID-19 Form three physics assignment (Linear motion)

1. The diagram below shows part of the motion of a tennis ball, which is projected vertically upwards from the ground and allowed to bounce on the ground. Use this information to answer questions that follow.

i) Describe the motion of the ball relating it to different positions of the ball along the following AB, BC, CDE.

ii) From the graph, calculate the acceleration due to gravity.

iii) How high does the ball rise initially?

iv) Explain why E is not at the same level as A.

2. Sketch a velocity- time graph showing the motion of a ball vertically upwards with an initial velocity of u.

3. Calculate the acceleration shown by the tickers-tape that was made using a ticker timer vibrating at 50HZ.

4. What is the difference between speed and velocity?

5.An object is projected vertically upwards at a speed of 15m/s. How long will it take to return to the same level of projection?

6.A block slides off a horizontal table 4 meters high with a velocity of 12-m/s. Find:

a) The horizontal distance from the table at which the block hits the floor.

b) The horizontal and vertical components of the velocity when it reaches the floor.

7.A particle initially at A moves along an arc AB of a horizontal circle of radius 4m and centre O.A is south of O and angle AOB is 600. Determine the displacement AB.

8.The figure represents dots made by a ticker-timer. The dots were made at a frequency of 50 dots per second. (Diagram not drawn to scale)

   

a) What is time interval between two consecutive dots?
b) The arrow on the tape indicates the dots made at time t = 0. Copy the diagram and indicate in a similar way the dots made at t= 0.1s, 0.2s, 0.3s. 

c) Determine the average velocities of the tape over time intervals -0.02s to 0.02s, 0.08s to 0.12s, 0.18s to 0.22s and 0.28s to 0.32s

d) Draw a suitable graph and from it determine the acceleration of the tape.

9.A mass is projected horizontally from height of 5m above the ground with a velocity of 30m/s. Calculate:

a) The time taken to reach the ground

b) The horizontal distance traveled before hitting the ground

c) The vertical velocity with which the mass hits the ground

10. The data in the table below represents the motion over a period of 7 seconds

a) Plot on graph paper a graph of displacement (y-axis) against time.

b) Describe the motion of the vehicle for the first 4 seconds.

c) Determine the velocities at 4.5s and 6.5 s. Hence or otherwise determine the average acceleration of the vehicle over this time interval.

11. a) A body accelerates uniformly from initial velocity, U to the final velocity V, in time t, the distance traveled during this time interval is S. If the acceleration is shown by the letter a, show that;

i) V= U + at                ii) s= ut + ½ at²           iii) V² =U² + 2as

b) A body initially moving at 50m/s decelerates uniformly at 2m/s until it come to rest. What distance does it cover from the time it started to decelerate?

12. An object dropped from a height h attains a velocity of 6m/s just before hitting the ground, find the value of h.

13.: a) A stone is thrown vertically upwards from the edge of a platform eventually the stone lands without bouncing on the ground below the platform. Taking the upward velocity to be positive, sketch the velocity-time graph of the motion of the stone.

b) A car can be brought to rest from a speed of 200m/s in a time of 2s.

i) Calculate the average deceleration

ii) If the driver reaction time is 0.2s, Determine the shortest stopping distance.


14.: The figure shows a speed-time graph for part of the journey of a motorcar.

Determine the distance the car travels in the first 40 seconds

15. Draw axes and sketch a graph of velocity (v versus time (t) for uniformly  accelerated motion given that when t = 0, v is greater than zero.

16. a) The figure below shows the displacement time graph of the motion of a particle.

State the nature of the motion of the particle between:

i) A and B

ii) B and C

iii) C and D

b) A ball is thrown horizontally from the top of a vertical tower and strikes the ground at a point 50m from the bottom of the tower. Given that the height of the tower is 45m, determine the;-

i) Time taken by the ball to hit the ground

ii) Initial horizontal velocity of the ball.

iii) Vertical velocity of the ball, just before striking the ground. (Take acceleration due to gravity g as 10ms-2)

16. The graph bellows shows how the velocity varies with time for a body thrown vertically upwards.

Determine the total distance moved by the body. (3mks)

17. A bullet is fired horizontally from a platform 15m high. If the initial speed is 300ms-1, determine the maximum horizontal distance covered by the bullet. (3mks)

18. Fig 14 shows the velocity-time graph for a small metal sphere falling through a viscous fluid.

On the axes provided sketch the graph of momentum against time for the same mass (1mk)

Given that the reading of the spring balance is 0.6N, determine the weight of the bar. (3mks)

The graph in figure 6 shows the velocity of a car in the first 8 seconds as it accelerates from rest along a straight line. Use the graph to answer question 19 and 20

Determine the distance traveled 3.0 seconds after the start. (3mks)

Determine the acceleration of the car at 4.0 seconds. (2mks)



21. A bomber flying horizontally at 100m/s releases a bomb from a height of 300m. Calculate:

a) Time taken for the bomb to hit the ground.

The horizontal distance traveled when hitting the ground.

c) The magnitude and direction of the velocity when hitting the ground?

22 An airplane is flying horizontally over a camp at 250m/s and drops a pack. How far from the camp will the pack land if the plane was flying 300m above the ground?

23. An object is projected horizontally at a velocity of 40m/s from a cliff 20m high. Calculate:

a) The time taken to hit the ground

b) The distance from the foot of the cliff when the object hits the ground.

24. A ball-bearing X is dropped vertically downwards, from the edge of a table and it takes 0.5s to hit the floor below. Another bearing Y leaves the edge of the table horizontally with a velocity of 5m/s. find:

a) The time taken for bearing Y to reach the floor.

b) The horizontal distance traveled by Y before hitting the floor.

c) The height of the table-top above the floor level.

25. A helicopter, which was ascending vertically at a steady velocity of 20m/s, released a parcel that took 20 second to reach the ground.

i) State the direction in which the parcel moved immediately it was released.

ii) Calculate the time taken by the parcel to reach the ground from the maximum height.

iii) Calculate the velocity of the parcel when it strikes the ground.

iv) Calculate the maximum height above the ground the parcel reached.

v) What was the height of the helicopter at the instant the parcel was dropped.

26. A stone is thrown horizontally from a building that is 50 m high above a horizontal ground. The stone hits the ground at a point, which is 65m from the foot of the building. Calculate the initial of the stone.

Nyamira county Science and Engineering fair 2020

The curtains for the fair came down on the evening of Wednesday, the 11th day of March. The closing ceremony was graced by Mr. Makaa, the Nyamira KUPPET chairman. It should also be noted that KUPPET sponsored the function by donating three trophies.

The regional science and engineering fair will be held at Isabania boys in Migori county as from 18th of March to 21 of March this year. The following schools qualified to represent Nyamira county in various categories.

As the editor of this blog, I take this earliest opportune time to congratulate the participants and wish them all the best in the regional competitions.


Mathematics
1. Geke secondary
2. Gekano boys
3. Geke secondary
4. Menyenya High 

Biology and biological science
1. Ntana secondary
2. Nyakemicha secondary
3. Ikonge PAG
4. Nyamira boys 

Physics
1. Rangenyo girls
2. Gekano mixed
3. Mochenwa secondary
4. Nyakongo boys 

Agriculture
1. Nyamiranga secondary
2. Mochenwa secondary
3. Menyenya high
4. Nyambaria school 

Applied technology
1. Riamoni secondary
2. Rangenyo girls
3. Don Bosco
4. Nyakemicha secondary 

Computer science/ ICT
1. Riamoni secondary
2. Nyambaria school
3. Gekano boys
4. Kebirigo high 

Behavioral science
1. Mochenwa secondary
2. Ikonge PAG
3. Nyakemicha secondary
4. Ikonge PAG 

Robotics
1. Tombe girls
2. Tombe girls
3. Sironga girls
4. Sironga girls 

Food science and Home economics
1. Tombe girls
2. Nyambaria school
3. Nyambaria school
4. Riamoni secondary


Environmental science
1. Nyambaria school
2. Matutu secondary
3. Mochenwa secondary
4. Mochenwa secondary 

Energy and transport
1. Mochenwa secondary
2. Nyamiranga secondary
3. Riamoni secondary
4. Tombe mixed 

Chemistry
1. Mochenwa secondary
2. Nyambaria school
3. Tombe mixed
4. Kiabiraa secondary 

Engineering
1. Tombe mixed
2. Nyambaria school
3. Nyaisa
4. Mochenwa secondary 

Best five schools
1. Mochenwa secondary
2. Nyambaria school
3. Nyamiranga secondary
4. Ikonge Girls
5. Nyakemicha secondary 

Sub-county ranking
1. Masaba north
2. Manga
3. Nyamira south
4. Nyamira north
5. Borabu

This summary has been compiled by; Erwin Mogusu; A science teacher in Nyamira county.