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Q91. Out of the following symmetry elements, which one is present in all classes of the cubic system?
The defining characteristic of the Cubic system is the presence of four 3-fold rotation axes along the body diagonals of the cube.
Q92. On a fault surface with strike and dip 320° and 55° NE, respectively, four sets of slickenlines were measured by a geologist. Given that the fault surface was measured correctly, the plunge and plunge direction of the lineation on the fault surface is
The dip direction of the fault is 320 + 90 = 050 (NE). A lineation with plunge 55 -> 050 represents a dip-slip lineation plunging directly down the dip of the fault plane.
Q93. Which one of the following river systems forms the largest fluvio-deltaic system in the world?
The Ganges-Brahmaputra Delta (Sunderbans) is the largest river delta in the world, covering over 100,000 square kilometers.
Q94. The Hoek-Brown failure envelope is typically the segment of which one of the following?
The Hoek-Brown failure criterion is non-linear and is empirically defined as a parabolic curve in principal stress space.
Q95. Which one of the following statements is CORRECT?
The Krishna-Godavari Basin is known for sandstone reservoirs. Salt domes are not typical of Upper Assam. Mumbai Offshore is extensional/inversion, not fold/thrust belt dominated like the Himalayas.
Q96. Which one of the following layers of the Earth has the largest volume?
The Lower Mantle represents the largest percentage of Earth's volume (~55%), significantly more than the core or upper mantle.
Q97. The age range of reservoir rock in Cambay oil field is:
The main reservoir rocks in Cambay are of Eocene age (approx 56 to 34 million years ago).
Q98. The P-wave velocity of the earth's mantle at the Mohorovicic discontinuity is approximately:
The Mohorovicic discontinuity (Moho) represents the crust-mantle boundary where P-wave velocity jumps sharply to about 8.0-8.1 km/s.
Q99. The number of hydrous minerals in the Moh's scale of hardness is:
The Mohs scale contains two hydrous minerals: Gypsum (CaSO4·2H2O) and Talc (Mg3Si4O10(OH)2).
Q100. The rock-type used to build the walls of the Red Fort in Delhi is
The Red Fort is famous for being built with red sandstone.