cameroon gce intermediate level 2024 engineering science 2

cameroon gce intermediate level 2024 engineering science 2

cameroon gce intermediate level 2024 engineering science 2

Copy the table below and complete the spaces
‘ S.I UNIT
1. ~ MEASURINGINSTRUMENT ~

PHYSICAL QUANTITY	Stop watch
Metre rule	Time
Scale balance	Distance	Kilogram
Newton	1	(4 marks) (1 mark)	Force

Calculate the mass of the block. (4 marks)
Define Density.
Figure 1 shows a rectangular block of density 2 g/cm
3 cm
(ii)
(iii)
4
2 cm
2 cm
Figure 1
State two conditions necessary for an object to be in equilibrium.
A builder of mass 70 kg supports himself on a scaffold as shown in figure 2.
(2 marks)
(b) (i)
(n)
o AQ
PA 0.8 m
2m
His weight causes reactTmat the supports P and Q. Determine thereaction X forces at P and(4Qmarks . )
\
(2 marks)

Define electric current and state its S.I units. A charge of 80 C past a point in a circuit in 20 s. Calculate the current that flows

(2 marks)

Fuses and earth wires perform protective role in electronic appliances. State what each of them
protects.
(2 marks)
An electric iron is rated 500 W, 110 V. Determine whether or not a fuse of value 3.2 A will be
suitable for use in the iron.
(2 marks

Figure 3
Consider the circuit in figure 3 above.
Name the meters X and Y.
Determine the total resistance.
Calculate the reading of meter X

Classify the metals given in the fallowing list as ferrous metals and non-ferrous metals: cast iron,
copper, silver and cobalt.
A spring of length 2.1 m obeys Hooke’s law when a force of 60 N is applied on it. Suppose the
extension of the spring is 0.1 m,
State Hooke’s law.
Calculate the extension when a force of 100 N is now applied.
(iii) Determine the new length.
(iv) Sketch a force–extension graph for the spring, indicating the elastic limit.
(2 marks)
(b)

(0 GO	(2 marks) (2 marks) (2 marks) (3 marks)
Pure metals and semi–conductors are important classes of engineering materials for ages. Differentiate
between these two classes of materials by copying and completing the table below.	(4 marks)

(c)

PROPERTIES	PURE METALS	SEMI-CONDUCTORS
Effect of temperature on

conductivity
Charge carriers
The two main types of changes encountered in chemistry are physical and chemical changes.

Magnesium burns in oxygen to form magnesium oxide; say whether this reaction is a physical	(i)
or a chemical change and give a reason for your answer. Write a well–balanced equation to show the reaction in (ii) above.	(2 marks) (2 marks)	(ii)

4. (a)
(b) Consider the compounds C2H4 and C2H6

State the names of the two compounds. To which homologous series does each of the compounds belong? Calculate the molecular mass of each of the compounds (Relative atomic masses: C = 12, H = 1).

(0 (ii) (iii)

Figure 4 shows a magnet, two compasses and two nails.
compass
(2 marks)
(2 marks)
(2 marks)
(c)
compass nails
8 N
magnet
Figure 4

Draw an arrow in each compass to show the direction of the magnetic field at the two positions. When the magnet is removed, the nails are still magnetised. List three ways by which the nails (2 marks)	(0 (ii)
can be demagnetised.	(3 marks)