List of practice Questions

In a mineral with chemical formula ATₓOₙ, the ionic radii of A and O are 1.12 Å and 1.40 Å, respectively. The co-ordination number of cation A is
Aluminium (Al) can occur in both tetrahedral and octahedral co-ordinations in silicates. The amount of octahedral Al in a pyroxene crystal of composition Mg₁.₄Fe₀.₄Al₀.₈Si₂O₆ is (give answer in one decimal place).
The birefringence of a mineral of thickness 30 μm and retardation 0.27 μm is (give answer in three decimal places).
Two limbs of a vertical chevron fold strike S70°E and N55°E. The value of the interlimb angle of the fold is (degree).
The core-rim compositions of a normally zoned plagioclase crystal are as follows:
Core: Ca₀.₆Na₀.₄Al₁.₆Si₂.₄O₈
Rim: Ca₀.₄Na₀.₆Al₁.₄Si₂.₆O₈
The amount of increase of Na atom from core to rim per formula unit of plagioclase is (give answer in one decimal place).
In an outcrop we find that the bedding planes are vertical and cleavage surfaces are horizontal. Which of the following fold types is/are inferred from this observation?
Which of the following stratigraphic unit(s) is/are coal/lignite bearing?
The Toposheet No(s). immediately adjacent to Toposheet No. 55J/8 is/are
Which of the following is/are NOT true for texturally immature sandstone?
P and S waves originate at earthquake focus and travel through the earth. Which of the following statements for these waves is/are correct?
An object is spotted at 60°E front bearing from the observer. If the position is interchanged, the front bearing value in degree from North (measured clockwise) is
Pressure (1GPa = 10 kbar) and temperature at the centre of the Earth are estimated to be
Choose the landform(s) resulting from glacial erosion.
Choose the correct combination(s) of type of dentition of Bivalvia and the corresponding representative genus.
Choose the correct combination(s) of textural features of magmatic rocks with corresponding petrological processes from the following.
Which of the following statements is/are NOT correct?
The tube feet in echinoids emerge through
A mineral with a point group symmetry 2/m
The progressive metamorphic isograd sequence that explains Barrovian metamorphism in pelite is
In metabasitic rocks, plagioclase is not stable in
A sandstone has<5% matrix. The recalculated modal compositions of feldspar, quartz, and rock fragments are 45%, 35%, 20%, respectively. The sandstone is classified as
Which one of the following lithostratigraphic units is of Phanerozoic Eon?
Check dams are constructed in association with main dam in the
A geological formation neither containing nor transmitting water is termed as
The characteristic rock of contact metamorphism is