The Ripple Symmetry Index (RSI) for the given hypothetical asymmetric ripple is_____. (Round off to one decimal place)
Correct Answer: 2.5
Solution and Explanation
The Ripple Symmetry Index (RSI) is defined as the ratio of the stoss side length to the lee side length of a ripple. In the given figure, the stoss side length is 10 cm and the lee side length is 4 cm.
RSI is calculated as follows:
RSI = stoss side length / lee side length
Plugging in the given values, we have:
RSI = 10 / 4 = 2.5
The calculated RSI value is 2.5
Top Questions on Applied Geology
Two boreholes A and B, both inclined towards 270°, penetrate a dipping coal bed at the same point and pass through it entirely in the sub-surface as shown in the figure below. The bed dips towards 270°. The thickness of the coal bed, measured along the borehole A is 10 m and along borehole B is 8 m. The angle between the two boreholes is 20°. The orthogonal thickness \( x \) of the coal bed is ........ m. (Round off to one decimal place)
- IIT JAM GG - 2025
- Geology
- Applied Geology
The data tabulated below are for flooding events in the last 400 years.
The probability of a large flood accompanied by a glacial lake outburst flood (GLOF) in 2025 is ........... \(\times 10^{-3}\). (Round off to one decimal place)
Year Flood Size Magnitude rank 1625 Large 2 1658 Large + GLOF 1 1692 Small 4 1704 Large 2 1767 Large 2 1806 Small 4 1872 Large + GLOF 1 1909 Large 2 1932 Large 2 1966 Medium 3 2023 Large + GLOF 1 - IIT JAM GG - 2025
- Geology
- Applied Geology
A satellite launching vehicle is carrying a lander for Moon mapping.
As shown in the figure below, P is the position where the gravitational forces exerted by Earth and Moon on the vehicle balance out.
The distance \( P \) from the center of the Earth is ........... \(\times 10^5\) km. (Round off to two decimal places)
- IIT JAM GG - 2025
- Geology
- Applied Geology
The isobaric temperature-composition (T–X) phase diagram given below shows the phase relation between components M and N. The equilibrium melting undergone by the rock R to generate the liquid of composition L is .............. % (In integer )
- IIT JAM GG - 2025
- Geology
- Applied Geology
Which of the following stereographic projections represent(s) an upright plunging fold?
- IIT JAM GG - 2025
- Geology
- Applied Geology
Questions Asked in IIT JAM GG exam
A magma having density of 2900 kg m\(^-3\) just reaches the surface through a two-layered crust as shown in the figure below. Assuming isostatic equilibrium, its depth of melting is .......... km. (Round off to one decimal place)
- IIT JAM GG - 2025
- Geophysics
A well-developed succession of laminated shale is bound by two volcanic ash beds that were precisely dated as shown in the schematic diagram given below. Assuming a constant sedimentation rate, the age of the fossiliferous limestone bed 65 m above the basal volcanic ash bed is ............ Ma. (Round off to nearest integer)
- IIT JAM GG - 2025
- Stratigraphy
The shaded region (P) in the given ACF diagram represents the compositional range of mafic rocks that have undergone granulite facies metamorphism. Which of the following equilibrium mineral assemblages is/are identified in these mafic rocks?
- IIT JAM GG - 2025
- Metamorphic Petrology
Match the stratigraphic units in Group I with their corresponding basins in Group II.
Group I Group II P. Kajrahat Limestone 1. Cuddapah Q. Shahabad Limestone 2. Pranhita-Godavari R. Chanda Limestone 3. Vindhyan S. Narji Limestone 4. Bhima - IIT JAM GG - 2025
- Stratigraphy
The schematic diagram given below shows textual relationship among garnet, muscovite, biotite and kyanite in a metapelite. Biotite defines S1 foliation and muscovite defines S2 and S3 foliations. S1, S2, and S3 fabrics were developed during distinct deformation events D1, D2, and D3, respectively. Which one of the following represents the pre-D3 mineral assemblage?
- IIT JAM GG - 2025
- Metamorphic Petrology