Aptitude Tests 4 Me

Mapping surface rocks is the first stage in modern oil exploration. By studying the rocks on the surface, geologists can guess at the structure of the rocks beneath the surface. Another method that helps them do this is to use an instrument called a gravimeter. This measures the slight differences in the gravitational force at different points on the surface of the Earth. The denser rocks have a greater gravitational attraction than the lighter rocks in the surface layers. By taking gravimeter readings at a number of places along the surface, it is possible to "map" the density of the rocks below, thus helping to find oil.

1173. According to the passage,

 (a) the rocks should be cracked first to drill oil (b) the rocks underneath the soil are spotted by the help of gravimeter (c) by examining the rocks, geologists find the coal (d) gravimeter is only used in the mountainous places to locate oil reservations

1174. Rocks

 (a) which have the denser gravitational force have more oil than the lighter ones (b) can be located by studying structure of the soil (c) can be found at different parts of the Earth (d) are first studied so as to locate the oil reservations

1175. It could be drawn out of the passage that

 (a) gravimeter readings are denser on the surface (b) oil exploration needs some steps to be taken before drilling (c) to be sure whether it's rocky, geologists use gravitational force (d) the bigger rocks absorb the gravitational force

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