The Islamic University of Gaza s1
Faculty of Engineering
Civil Engineering Department
Instructor: Raed M. Khaldi / Engineering Geology ECIV 2204
Mid term Exam – 2006
Date : 12/4/2006
Time allowed: 1.00 hour
Student Name:______Student No.______
Answer sheet
Please, put the correct answers on the answer sheet
Question (1)
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Question (2)
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Question (3)
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Question (1) State whether the following statements are True or False.
2- / ( ) / Granite headstones typically weather more rapidly than limestone headstones.
3- / ( ) / It is preferable for an engineer to depend on geotechnical report more than geological report.
4- / ( ) / Rhyolite has high viscosity with comparison to basalt.
5- / ( ) / In slow cooling, nucleation rate of the magma is greater than growth rate.
6- / ( ) / A sill is a discordant body of the intrusive magma.
7- / ( ) / Metamorphic rocks are formed by the melting and crystallization of magma far beneath the surface.
8- / ( ) / A rock may be subjected to either mechanical or chemical weathering at the same time.
9- / ( ) / Sedimentary rocks may consist of particles of pre-existing sedimentary rocks.
10- / ( ) / All minerals are compounds.
11- / ( ) / The continental crust is always thicker than the oceanic crust.
12- / ( ) / Fluvial is the sediment that deposited by a stream.
13- / ( ) / Arkose contains quartz and more than 25% feldspar
14- / ( ) / Fossiliferous Limestone can be classified as a chemical sedimentary rock.
15- / ( ) / Petroleum is formed from the remains of micro-plants and animals those live in the sea.
16- / ( ) / Geodes considers a Secondary structures of sedimentary rocks.
17- / ( ) / Gypsum is belong to sulphate group.
18- / ( ) / Deep marine deposits are overlain by shallower marine deposits indicate sea regressions.
19- / ( ) / Pyrite is composed of iron and sulfer.
20- / ( ) / Metamorphism represents the set of processes by which rocks undergo liquid-state changes.
21- / ( ) / Organic soils can be dealt with as a good material for construction.
22- / ( ) / The cobble gravel size is smaller than the pebble size
23- / ( ) / Rocks is the building blocks of the earth crust.
24- / ( ) / Intrusive and volcanic are a synominus can be used interchangeably igneous rocks
25- / ( ) / Gabbro is the rock of low silica content and aphanitic texture.
Question (2) Answer each of the following questions and placing the letter of the BEST ANSWER on your answer sheet.
1-Measurement of radioactive elements in rocks:
A- provides the relative age of the rockB- is no longer feasible because of contamination due to nuclear testing
C- provides the absolute age of the rock
D- never works because rocks contain only trace quantities of radioactivity
2-Which of the following is a part of the definition of a mineral:
A- a liquid that may become solid / B- man-madeC- definite chemical composition / D- unorganized structure
3-The colour of a powdered mineral is:
A- the same as the colour of the mineral specimen / B- its streakC- is not a reliable physical property / D- none of these
4- Which of the following minerals are arranged in order of increasing hardness:
A- topaz, quartz, fluorite, corundum / B- quartz, topaz, diamond, fluoriteC- talc, quartz, calcite, diamond / D- talc, apatite, corundum, diamond
5-Rocks of the continents are enriched in the elements:
A- silicon and iron / B- iron and magnesiumC- silicon and aluminum / D- magnesium and silicon
6-Geologic processes that resulted in the formation of continents and ocean basins
A were only active during Earth’s early history / B- are still active todayC- have occurred on the other terrestrial planets / D- all of these
7- The lithosphere is composed of :
A- the crust and upper mantle / B- the mantle onlyC- the sima / D- the sial
8-The Continuous Series of Bowen’s Reaction Series is composed of minerals:
A- with different chemical compositions and different mineral structuresB- with similar chemical compositions and different mineral structures
C- with different chemical compositions but the same mineral structures
D- with similar chemical compositions and similar mineral structures
9-The two important criteria used for igneous rock classification are:
A- temperature and texture / B- mineral composition and temperatureC- mineral composition and texture / D- Bowen’s Reaction Series and texture
10-An igneous rock with minerals that can be seen with the unaided eye exhibits:
A- porphyritic texture / B- aphanitic texture / C- phaneritic texture / D- pyroclastic texture11-Which of the following is a form of mechanical weathering:
A- dissolution / B- chemical weathering / C- hydrolysis / D- none of these12-Caves form as a result of a) mechanical weathering of limestone:
A- mechanical weathering of limestone / B- oxidation of limestoneC- dissolution of limestone / D- hydrolysis of limestone
13-Chemical weathering is most effective in which combination of conditions
A- cold and arid / B- warm and humid / C- warm and arid / D- cold and humid14-A well-sorted sediment might consist of:
A- grains of a variety of sizes (diameters)B- grains of moderate but different dimensions (diameters)
C- predominantly round grains
D- large grains all of approximately the same size (diameter)
15-Which of the following is not a factor influencing the rate of chemical weathering:
A- climate / B- particle size / C- gravity / D humidity16-The process whereby rocks are changed to sediment is called:
A- lithification / B- deposition / C- weathering / D- compaction17-A sedimentary rock composed of rounded particles of gravel is:
A- breccia / B- sandstone / C- gravelstone / D- conglomerate18-A layer in which the grain size becomes smaller vertically through the layer is called:
A- foliated / B- graded bedding / C- cross-bedded / D- none of these19-Which of the following lists is arranged in order from lowest to highest grade of metamorphic rock:
A- gneiss, slate, schist, phyllite / B- gneiss, schist, phyllite, slateC- slate, gneiss, phyllite, schist / D- slate, phyllite, schist, gneiss
20-Examples of typical high-grade metamorphic rocks would include all of thE following except:
A- slate / B- migmatite / C- eclogite / D- gneiss21-Cross-bedding observed in river sand can be used:
A- to determine the direction the water was flowingB- to determine the speed of the river
C- determine the height of the waves in the river
D- to determine the temperature at the time the ripples formed
22-The silica tetrahedron is composed of:
A- 1 silicon and 4 aluminium atoms / B- 1 silicon and 4 oxygen atomsC- silicon chips / D- silicon, iron and aluminium atoms
23-Limestone composed mainly of:
A- carbonate minerals / B- clay minerals / C- calcite minerals / D- dolomite minerals24-A sedimentary rock composed of clay-sized particles is called:
A- siltstone / B- shale / C- breccia / D- none of these25-Any fine-grained rock produced by contact metamorphism called:
A- mylonites / B- amphibolite / C- hornfels / D- none of theseQuestion (3) Fill-In-The-Blank
Sediment becomes sedimentary rock by the process known as (1) ______, which involves the compaction of grains, loss of water, and (2) ______whereby material is precipitated in pore spaces and binds grains together.
(3)A______occurs when the sea advances landward.
When a magma cools rapidly, nucleation (4) ______, and the rate of crystal growth (5) ______, and the resulting rock is fine-grained.
A(6)______are assemblages of minerals reflecting different metamorphic environments.
A(7) ______is a discordant magma body with exposed surface area of more than 100 km2.
A(8) ______involves the physical disintegration of rock.
A(9) ______represents a zone of accumulation where some material from the A horizon is deposited.
A(10) ______states that laws or processes operate today have operated throughout geologic time.
Wish you a good luck