TECHNOLOGY GRADE 9
MID YEAR EXAMINATION
DATE 24/05/24
TOTAL MARKS: 70
EXAMINER: MR TERRY
MODERATOR: MR PRINCE
Instructions
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Read the questions carefully before answering
Allocate your time wisely. Each question may have a suggested time limit.
Answer all questions. Marks may be awarded for attempted answers.
Write legibly and clearly. Illegible handwriting may result in loss of marks.
Write your answers in blue ink only.
Show all your workings for mathematical problems. Marks may be awarded for the process
even if the final answer is incorrect
Materials
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Scientific Calculator
Blue Pen
QUESTION 1
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(Total 6)
QUESTION 2
2.1 Underline the correct word in the brackets. (5)
2.1.1 When gas is compressed in a closed container, this system is called (hydraulic/ pneumatic) system.
2.1.2 Liquid is (compressible / incompressible).
2.1.3. Air is (compressible / incompressible).
2.1.4. The force transfer in a hydraulic system is (greater than / less than) the force transfer in a
pneumatic system.
2.1.5. According to Pascal’s principle “when pressure is applied to a fluid, the force is transmitted
(equally / unequally) in all directions”.
2.2 Fill in the missing words. (5)
2.2.1 In a hydraulic system with two equal syringes, we get __________________ distance and
___________________ force between the two syringes.
2.2.2 In a hydraulic system where movement is from a small syringe to a larger syringe, the output
distance is _________________ and the output force is bigger.
2.2.3 When the output force is increased by the force transfer from the input force, we call this
_____________________________.
2.2.4 Newton is the unit in which _______________ is measured
2.3 Match COLUMN A with COLUMN B. Write only the letter of the alphabet (A – E) in the ANSWER
column. (5)
COLUMN A
ANSWER
COLUMN B
2.3.1 Cylinder
A. It takes into account
the area over which
the force is acting
B. Stop air from flowing
out.
C. Tubes to suck in the
air or liquid.
D. Is a pull or a push
and changes the
velocity of an object.
E. Is found inside the
tube to compress the
air or push
2.3.2 Piston
2.3.3 Force
2.3.4 Valves
2.3.5 Pressure
2.4 Match COLUMN A with COLUMN B. Write only the letter of the alphabet (A – F) in the ANSWER
column (6)
COLUMN A
2.4.1 Pneumatic system
2.4.2 Hydraulic system
2.4.3 Driver cylinder.
2.4.4 Driven cylinder
2.4.5 Compressible
2.4.6 Incompressible
ANSWER
COLUMN B
A. It can be compressed to take
up less space.
B. It can also be called master
cylinder or input
C. It cannot be pressed to take
less space
D. It is a tube and syringe filled
with a liquid (water or oil).
E. The output cylinder or the
slave cylinder
F. It is a tube and syringes filled
with air
(Total 21)
QUESTION 3
3.1 Study the hydraulic system below and answer the questions that follow.
3.1.1 Use the picture above to explain how forces within a hydraulic system are transferred. (4)
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3.1.2 Calculate the output force, if the input force is 50N, the input piston’s area is 100mm² and the
output piston’s area is 800mm². (3)
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3.1.3 Draw a systems diagram for the above hydraulic Jack. (4)
(TOTAL 11)
QUESTION 4
Study the diagram of the hydraulic jack below and answer the questions that follow.
4.1.1 Identify the interacting systems in the hydraulic jack. (4)
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4.1.2 What is the purpose of the larger piston in the system? (2)
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4.1.3 What is the function of the one-way valve in the system? (1)
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4.1.4 What is the purpose of the release screw in the system? (3)
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4.1.5 Describe the mechanical advantage of the system. (2)
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(Total 12)
QUESTION 5
5.1 Complete the table below for each of the mechanical systems illustrated. (12)
5.2 The mechanism below is an important control device used in many systems.
5.2.1 Name the parts labelled A, B and C.
A. _______________________
B. _______________________
C. _______________________ (3)
5.2.2 What is the purpose of part C in the above mechanism? (2)
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5.2.3 Give ONE example of a device that uses this locking system (1)
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5.3 Most bicycles use rim brakes, where a braking force is applied to the rim of the wheel. Give any
THREE advantages of using rim brakes in bicycles. (3)
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(Total 20)