cameroon gce A level 2024 engineering science 2
cameroon gce A level 2024 engineering science 2
ANSWER ALL QUESTIONS
In an experiment to determine the characteristics of a linear generator, a rheostat is used to vary the readings on
1. the ammeter and voltmeter. The characteristics U. => /(/) is shown in f igure e ow
Determine the emf and the internal resistance r of the generator. (3 marks)
In a game reserve, the converging lens of the camera used to observe a giraffe 36 m away, forms an inverted
image of height 2.5 cm at 30 cm behind the lens. Calculate the:
a) Magnification produced.
b) Height of the giraffe.
2.
(1 mark)
(1 mark)
Draw the structural formulas for the following hydrocarbons.
a) 2,4–dimethylpentane.
b) hex–2–ene.
3.
(1.5 marks)
( 1.5 marks)
Uranium–238 nucleus disintegrates according to the reaction. 2\\U –> 29Q77I –f * %X. >
(i) Determine a and b
(ii) Name X and state the type of decay •
4.
(2 marks)
(2 marks)
5. A solution was made by dissolving 12.87 g of washing soda,Na2CO3.10H2O in water.
Calculate the amount (in moles) of washing soda present in the solution.
(Relative Atomic Masses: Na = 23; C = 12, O = 16, H = 1)
A current of 8 A flows through a coil of 2000 turns per meter in 5 ms. Determine:
(i) The force per magnetic flux density through the coil.
(ii) If the coil has a flux of 0.25 Wb. Find the self–inductance of the coil.
(2 marks)
6.
(1.5 marks)
(1.5 marks)
7. A mass of 5kg is moving in a circle of radius I m. If the centripetal force acting on the mass is
| 20N , find the linear velocity and angular velocity. |
(3 marks |
SECTION B
ANSWER ANY THREE QUESTIONS
(If you attempt more than three questions in this section only the first three will be considered)
a) Iron is usually made into steel alloys.
(i) What do you understand by the term alloy?
(ii) Give two reasons why iron is converted into steel alloys.
(iii) State the major disadvantage of using alloys over pure metals.
(iv) Give two uses of steel.
8.
(1 mark)
(2 marks)
(1 mark)
(2 marks)
b) A double concave lens of index of refraction 1.45 has radii of magnitudes 30 cm and 25 cm. An object is
located 80 cm to the left of the lens.
(i) Determine the focal length of the lens.
(ii) Calculate the image distance
(iii) Calculate the magnification of the image.
(iii) Is the image real or virtual, upright or inverted?
c) (i) Define a unit cell.
(ii) Name two types of packing in a crystal
Glass is a typical ceramic material manufactured in Cameroon.
(iii) State the raw materials for glass production.
(iv) Which property of glass makes it suitable for manufacturing laboratory apparatus?
