Composition Anglais · 2ème Trimestre 2ème Année Secondaire Sujet N°: 5

by a slight pressure of your hands. You could not do this so easily if you tried to raise yourself from the living-room floor because air is less buoyant than water. In the third cenutry BC, Archimedes discovered the principle of buoyancy. It states that a body wholly or partly immersed in a fluid is buoyed upward with a force equal to the weight of volume of liquid it displaces. Let us imagine that in a full pail of water we place an iron ball that weighs ten pounds when weighed in air. We discover, however that under water this ball weighs only eight pounds- a loss of two pounds. The volume of water that spilled over when the ball was placed in the full pail weighs two pounds, which just equals the ball’s loss of weight. The ball is actually buoyed up by a force equal to the weight of the water it displaces. A/ Comprehension and Interpretation: 1- Write the letter which corresponds to the right answer: A/ The text is about: a- The property of buoyancy b- Famous discoveries c- Scientific experiments B/ The weight of some objects under water and in the air is: a- The same b- different c- unknown C/ The experiments conducted through the text fit in : a- Biology b- physics c- chemistry 2- Answer the following questions according to the text: a- Do all objects sink in water? b- How is buoyancy defined in the text? c- Why is Archimedes so famous today? 3- In which paragraph is the explanation for the experiment given? 4- What or who do the underlined words refer to in the text? a- One (1§) b- this (§2) c- that (§3) B/ Text Exploration : 1- Find in the text words that are synonyms to the following: a- Own=(§1) b- entire= (§2) 2- Find in the text words that are opposite in meaning to the following: a- more(§2)≠ b- empty (§3)≠ 3- complete the chart as shown in the example: Verb Noun Adjective To invent Invention Inventive experiment To believe successful 4- Give the correct form of verbs in of the brackets: If you ( to rub) an object with silk, it ( to acquire) a positive charge. But when two balloons ( to be rub) against a woollen sleeve, they ( not attract) to each other because the charge they acquire (to be) the same, either positive or negative . 5- Classify the following words according to the number of their syllables: experiment- science- float – hypothesis One syllable Two syllables Four syllables 6- Fill in the gap with the words from the list : moves- happens – energy – flow Electricity is a type of ...1… that can build up in one place or ...2… from one place to another. When electricity gathers in one place it is known as static electricity. But when it...3… it is called current electricity. Static electricity often ...4… when you rub things together.

Part Two: Written Expression

Choose one of the following topics: Topic 1: Use the information to write a description of an experiment *You/ to fill two bowls / with warm tap water *You / to add salt / to one of the bowls