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Year 10 ENTRY EXAMS FOR YEAR 9. SCIENCE CHECKPOINT EXAM

SECTION A CHEMISTRY

  1. The atomic structure of an element is shown below.
Image result for atomic structure of carbon
  1. Write down the name and the symbol of the element.

i.Name…………………………………………………………………………….

ii.Symbol………………………………………………………………………….

  • Write down the electron arrangement of the element…………………………………………
  • Which Group and Period does the element belong?

i.Group……………………………………………………………………………..

                         ii.Period……………………………………………………………………………..

  • I am an element in found in group five and period three. Which element am I?

……………………………………………………………………………………………………..

  • Define the following terms.
  1. Atom ………………………………………………………………………………………………………………………………………………………
  • Element …………………………………………………………………………
  • Write down the elements with the following symbols    
  • P

………………………………………………………………………

  • Ca …………………………………………………………………………
  • Write down the electron arrangement of each element.
  1. Aluminum……………………………………………………………..
  • Argon…………………………………………………………………..
  • An atom is the smallest particle of an element which cannot be split further by any chemical means. Write down the three kinds of particles that make up an atom

           i.    ………………………………………………………………………………………

            ii.  ………………………………………………………………………………………

            iii. …………………………………………………………………………………… [3]

  • The symbol K shown represent Potassium element

Write down                                                              

         a. its mass number?      ……………………………………..  [1]                                            

           b. its atomic number? ……………………………………… [1]

  • Draw a diagram to show the electron distribution in the shells of a chlorine atom. Use dots or crosses (3)
  • Complete the following reactions  equations          [8]
  1. Sodium carbonate  + sulfuric acid
  • Potassium  +  hydrochloric acid
  • Calcium hydroxide  +  nitric acid
  • Lithium  + water
  • Apart from temperature, write down other three factors that affect the rate of a chemical reaction.                                       

i. ………………………………………………………………………………………………………………..

ii.   ………………………………………………………………………………………………………………..

iii.  ……………………………………………………………………………………………………………[3]

  1. Using the particle theory, briefly explain how change in temperature affect the rate of a chemical reaction

…………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………[2]

  1. An experiment was done in two different temperatures to see how the change in temperature affects the rate of a reaction.

                    Experiment A was done in a temperature of 300c

                    Experiment B was done in a temperature of 500c

The graph below shows the results for the two reactions.

On the graph label A and B to indicate the two reactions                                            [2]

Vol of

gas

produced

                        Time (sec)

  1. Complete the following displacement reactions where possible. If impossible, write ”No reaction”[5]
  •     
  •  

SECTION B  BIOLOGY

  1. Define the following terms:                                                                                                       4marks.
  2. Photosynthesis.

……………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………

  • Ecology.

……………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………

  • Food web.

……………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………

  • Decomposers

……………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………

  • Explain why photosynthesis only takes place inside chloroplasts.                                  1marks.

……………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………

  • a ) Give 2 examples of mineral salts that are needed by plants.                                     2marks

……………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………

b) Explain why a plant that does not have enough magnesium will not grow well.              2marks

……………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………

        4.        Explain 4 roles of water to plant    8marks

……………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………

5. Explain why plants need help to get their male gametes to their female gametes. 1marks.

…………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………

        6.        a) Explain what is meant by seed dispersal. 1 mark.

………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………

       7.  Explain 3 factors affecting the size of animal population.      6marks.

………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………

       8.         State and explain the effects of  adding fertilizers to water sources.   5 marks.                                    

………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………

SECTION C PHYSICS


1.   State the Principle of Moments ?  1mark
………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………


2. For a see-saw to balance, the moments on each side must be the same.

   For each of these, write “balanced” or “unbalanced” :

          (i)                                                                                   (ii)

       => ___________________________________         => _______________________________

          (iii)                                                                                  (iv)

  

    => _______________________________ 
               =>_______________________________

  3.  The  see-saws  shown below is balanced. Work out the missing number for each one.
          (i)

     

 2 marks

……………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………


5.   A seesaw is 4.0m long with the pivot at its midpoint. A boy who weighs 400N sits at   

      a distance of 1.5m from the pivot. His sister weights 300N
    (a) Draw a diagram to show the beam, the Pivot and the forces and their distance from

          the pivot.                                                                                                                             [2]

……………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………



     (b) Calculate the distance at which the girl must sit if the beam is to be balanced.        [2]

……………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………

6.  (a) What is meant by the term ‘density’?[2]
………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………

  (c)  A fish tank measures 80 cm x 20 cm x 25 cm. It is to be filled with water , density 1.0 g/cm3. Calculate the mass of water in the tank when it is full .                                              [3]


……………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………


7       A student measures the volume of a cork.

He puts some water into a measuring cylinder and then one glass ball. He puts the cork and then a second, identical glass ball into the water as shown.

cm3 cm3 cm3  
100 100 100  
80 80 80 glass ball
     
60 60 60  
40 40 40 cork
     
20 20 20  
  glass ball   glass ball
    diagram 1     diagram 2   diagram 3  

            Diagram 1 shows the first water level.

     Diagram 2 shows the water level after one glass ball is added.

           Diagram 3 shows the water level after the cork and the second glass ball are added.
          
What is the volume of the cork?                                                                                    [3]
………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………


8.  The fig below shows Jung Yae Ji standing on soft sand. She does not sink into the soft sand.  
     She has a mass of 50 kg.

        (a)  Calculate the force of her body acting on the sand.

……………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………

                                                                                            Force = ………………….  [ 2]
                                                                                                  

  • The total area of both her shoes in contact with the sand is 0.02 m2.

Calculate the pressure the she exerts on the sand, when standing as shown in the figure                                                                                                                   [3]

………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………… 

                                                                                              Pressure = …………………………….. N / m2
                                                                                                                                                             

           (c)   Fig. 8.2 shows a block of wood.

5.0 CM

5.0 CM

10.0 CM

Fig. 8.2 (not to scale)

                 
                The block of wood shown in Fig. 8.2 has a mass of 200 Kg. 
             Calculate the MAXIMUM Pressure it can exert on its surface                        

………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………  [3]         

9 . (a) Use the words from here (torch, battery, connecting wire, variable resistor, switch and bulb)
          to label the diagram below.

A is ___________________                    B is ___________________



C is ___________________                    D is ___________________

                                                                                                                                                      [4]

(b) Is the globe working and lit up?   Explain your answer.
    

                                                                                                                                         1 mark