Science Form 4 Chapter 6,7 & 8

SCIENCE FORM 4 Assessment Test Paper 2 (50%) Section A (20%) 1. Figure 1 show the set-up of apparatus for an experiment to determine the focal length for a convex lens.

Figure 1 a. State the purpose for the experiment above. [1 mark]

___________________________________________________________________________________ _ b. State the following variables: [2 marks] i. Responding variable: __________________________________________________________________ ii. Constant variable: ____________________________________________________________________ c. State one characteristic of the image on white screen. [1 mark]

___________________________________________________________________________________ _ 2. Figure 2 show a pinhole camera for an experiment.

Figure 2 a. State two characteristics of image formed in the pinhole camera. [2 marks]

_____________________________________________________________________________________ b. What will be if the pinhole is become bigger? [2 marks]

_____________________________________________________________________________________ c. How the image become sharper and bright but without any changes to the apparatus? [2 marks]

_____________________________________________________________________________________ d. Make a conclusion. [2 marks]

_____________________________________________________________________________________

3. Figure 3 show a red light is beam to a white screen with red filter in a dark room.

Figure 3 a. What will show on white screen? [1 mark]

_____________________________________________________________________________________ b. If the red filter changes to green filter, what will happen? [1 mark]

_____________________________________________________________________________________ c. If red light is change to white light, what will change? [1 mark]

_____________________________________________________________________________________ d. Explain your answer in 3 (c). [2 marks]

_____________________________________________________________________________________ e. Explain what pigments are. [3 marks]

_____________________________________________________________________________________ _____________________________________________________________________________________ Section B (30%) 4. Figure 4 show a process of nuclear energy.

Y

X R

Z Figure 4

a. Name the process above. [1 mark]

____________________________________________________________________________________ b. Explain your answer in (a). [3 marks]

____________________________________________________________________________________ ____________________________________________________________________________________ c. Give an example for X, Y, Z and R. [2 marks]

X: _________________________________

R: _________________________________

State two advantages of nuclear energy. [2 marks] i. __________________________________________________________________________________ ___________________________________________________________________________________ ii. _________________________________________________________________________________ ___________________________________________________________________________________ d. State a method that how to handling a radioactive substance. [1 mark]

____________________________________________________________________________________ 5. Figure 5 show three colours of light.

Z

Figure 5 a. What colour is Z? [1 mark]

_____________________________________________________________________________________ b. Give a reason for your answer in 5 (a). [1 mark]

_____________________________________________________________________________________ c. State the primary colours of pigments. [3 marks]

_____________________________________________________________________________________ 6. Figure 6.1 and Figure 6.2 show two different particles of two objects.

Figure 6.1

Figure 6.2

a. Name the figures: [2 marks] i. 6.1: _______________________________

ii. 6.2: _______________________________

b. State the difference between your answer in 6 (a i) and 6 (a ii). [3 marks] _____________________________________________________________________________________ _____________________________________________________________________________________ c. State the composition of: [4 marks] i. Steel: _____________________________

ii. Brass: _____________________________

d. State two special properties of steel. [2 marks] _____________________________________________________________________________________ 7. Figure 7 show a molecule of ammonia. Hydrogen W

Figure 7 a. State one use of ammonia. [1 mark] _____________________________________________________________________________________ b. Name the W. [1 mark] _____________________________________________________________________________________ c. Explain what Haber process is. [2 marks] _____________________________________________________________________________________ _____________________________________________________________________________________ d. Give one method of controlling industrial waste to disposal avoid pollution. [1 mark] _____________________________________________________________________________________ Good Luck Marks: Section A (20%) 1.

2. 4

3. 8

8

Section B (30%) 4.

5. 9

6. 5

Total: 100

7. 11

5