List of top Questions asked in GATE Geology and Geophysics

Consider two intersecting, north-easterly striking and south-easterly dipping dikes Y1 and Y2, which are exposed on an east-west trending vertical wall of a granite (X) quarry as shown below. 

The angle that the dikes make with the horizontal on the quarry wall is

Select the option that lists oxide minerals only.
A sample contains 7 wt% CaO and 5 wt% MgO. The molar ratio of CaO to MgO in the sample is ________(Round off to two decimal places)

A watershed has an area of 74 km\(^2\). The stream network within this watershed consists of three different stream orders. The stream lengths in each order are as follows: Ist order streams: 3 km, 2.5 km, 4 km, 3 km, 2 km, 5 km
IInd order streams: 10 km, 15 km, 7 km
IIIrd order streams: 30 km
The drainage density of the watershed is _________km/km\(^2\) (Round off to two decimal places)

Which of the following time boundaries correspond(s) to major mass extinction events?
The continuous series of Bowen’s reaction series is represented by
Which one of the following geophysical methods can provide information on deep Earth structures (of the order of 1000 km) with highest resolution?
A type of fold which is relatively sharp and angular at its synformal and antiformal hinges is known as:
A 3×3 image (Image A) has been linearly stretched to get the maximum contrast in an 8-bit display system. Digital Number (DN) values of the pixels in Image A are shown. The value of the pixel marked as '?' in the output Image B after linear stretching is ________
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On a normal fault plane dipping 60° towards east, the measured heave and throw are 5 m and 12 m, respectively. If the strike-slip component of the fault is 13 m, the magnitude of true displacement of the fault is ________m.
What is the value of the maximum shear stress in a rock, for which the state of stress is given by the following Mohr circle?
Which one of the following minerals has crystallographic axes \( a_1 = a_2 \neq c \) and all interaxial angles equal to 90°?
Choose the correct option where both organisms do NOT secrete any CaCO\(_3\) (calcite or aragonite).
Which one of the following expressions represents porosity of a rock?