Angel International School - Manipay
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1 c Grade 8 Angel International School - Manipay 1 st Term Examination November, 2016 Chemistry PART I Multiple Choice Questions. Duration: 02 Hours Index No:- (1) A common sedimentary rock which is formed from plant material is a) Coal b) Chalk c) Diamond d) Marble (2) Change in size of particles during process of metamorphism is classified as a) Folding b) Bending c) Recrystallization d) Bedding (3) Examples of rocks includes a) Granite b) Marble c) Sandstone d) All of them (4) A mixture containing equal volumes of two liquids that mix completely but do not react together is placed in the apparatus shown and heated until the thermometer first shows a steady reading. At which position will there be the highest proportion of the liquid with the higher boiling point? (5) A crystalline or glassy rock formed when magma or lava cools down and solidifies is called a) Sedimentary rocks b) Metamorphic rocks c) Igneous rocks d) Morphic rocks (6) Layers of sediment s. a) Graded bed b) Strata c) Bedding plane d) Bedding (7) Obsidian is rich in a) Silica b) Iron c) Cobalt d) Calcium (8) Limestone s are very rich in a) Calcium b) Carbonate c) Calcium carbonate d) Magnesium carbonate (9) A stone which is used to smooth skin is glassy volcanic rock formed from lava froth is a) Obsidian b) Pumice c) Basalt d) Granite (10) Shale refers to a rock formed from: a) Sand sized material b) Plant remains c) Clay minerals d) Carbonates (11) A feldspar-rich sandstone is called a) Arkoses b) Litharenite c) Quartz arenete d) Shale (12) Volcano that forms from column of magma is called a/an a) Underwater volcano b) Convergent volcano c) Divergent volcano d) Hot spot volcano 1
2 (13) Dust, ash and lumps of molten rock a) Phaneritic b) Aphanitic c) Porphyry d) Pyroclastic (14) Fossils are remains of ancient plants and animals a) True b) False (15) From which living organism is chalk formed a) Crinoids b) Snail c) Clamps d) Foraminifera (16) Which is not a rock made from shale? a) Phyllite b) Schist c) Gabbro d) Slate (17) When a volcano ejects acid lava, eruption is usually a) Light and less violent b) Soft and less violent (18) During eruption, volcanic material is a) Blown to some meters c) Loud but less violent d) Loud and more violent c) Blown to some inches d) Blown to some feet b) Blown to many kilometers (19) Water in freezing form may break rocks in to pieces by force of a) Reduction b) Evaporation c) Expansion d) Condensation (20) Weathering of rocks is affected by a) Rain b) Temperature c) Both' a' and 'b' d) Erosion (21) Which layer does not belong to evaporates? a) Gypsum b) Halite c) Fossil d) Anhydrite (22) Pieces of material are placed in turn between P and Q in the incomplete electrical circuit shown. Which material would not cause the bulb to light? a) aluminium b) diamond c) magnesium d) zinc (23) The diagram below represents geological processes that act continuously on Earth to different rock types. which table correctly classifies each rock type? 2
3 (24) Use the rock cycle diagram to answer the question. (25) Which pair of letters best represents the sequence of a sedimentary rock changing into a metamorphic rock? a. B, C b. B, D c. E, C d. E, D 3
4 Part - II I. Sediment describes large particles of an insoluble solid which settle out from the liquid. 1. With the help of the following pictures give below explain in detail about each stages in a course of a river. a) b) c) (06marks) 2. What happens when a river goes through a bend? (02 marks) 3. Give two differences between the Moon, Venus and Earth. Moon Venus Earth 4
5 (06 marks) 4. Fill in the blanks. The rock fragments produced by weathering are transported away by a process called. The fragments may be pulled down a mountain side by the _ and form a slope. (03 marks) II. The ways in which rocks form and are destroyed form a rock cycle. 1. Complete the rock cycle. (02 marks) 2. How much percentage of Silica is present in a) Granite b) Gabbro c) Andesite d) Basalt 3. Give one difference between intrusive and extrusive igneous rock. Intrusive Igneous Rock Extrusive Igneous Rock (04 marks) 5
6 (0 4 marks) III. A volcano is a mountain made from molten rock and ash. 1. Label the parts of an Andesitic Volcano. (0 4 marks) 2. Lava on cooling forms a rock. What is the name of the rock? (01 mark) 3. In what way is Basaltic Volcano is different for Andesitic Volcano? (01 mark) 4. Give one difference between intrusive and extrusive igneous rock. Regional Metamorphism Contact Metamorphism (0 4 marks) 5. What is meant by: a) Dyke b) Sill c) Batholiths d) Xenoliths e) Magma (10 marks) 6
7 IV. Surface of a rock exposed to air, the process of weathering begins. 1. What are the 2 types of weathering? (2 marks) 2. Identify which type of physical weathering? a) Minerals expand due to heat and contract due to cool b) Water enters to pores and turns to salt c) Pieces of rock rub against each other d) Water turns to solid due to cold weather e) Roots push on grounds (10 marks) 3. Complete the equation a) Carbon dioxide + water b) Carbonic acid + feldspar + V. Texture is the appearance of the surface of the rock. 1. The pictures given below are granite and sandstone respectively. Answer the following questions (06 marks) Granite a) Write any two points for each of the following. Sandstone Feldspar Quartz Mica (06 marks) b) Identify the type of sandstone. 1. Light brown in colour 2. Greenish in colour (2 marks) 6. Give one difference between porous rock and non-porous rock. Porous Rock Non-Porous Rock ***** (1x2 = 2 marks) 7
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