List of top Questions asked in IIT JAM GG

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).
A fault surface in an outcrop has slickenside lineation whose pitch is 30°. The horizontal slip on the fault is 1.25 m, as determined from displaced vein. The net slip on the fault is ........ meter (give answer in two decimal places).
In an outcrop, we find a Belemnite fossil broken into five rectangular pieces (boudins) of equal size. Long dimension of each boudin is 1.35 cm. Gap between adjacent boudins in all cases is 0.25 cm. Note that the long dimensions of boudins are perfectly aligned. The % elongation is ....... (give answer in one decimal place).
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 \( S60^\circ E \) front bearing from the observer. If the position is interchanged, the front bearing value in degrees from North (measured clockwise) is ...........
The mole% of forsterite component in olivine with chemical formula \( \text{Mg}_1.5\text{Fe}_0.5\text{SiO}_4 \) is .......
The Weiss symbol of a crystal face is 4a: 2b: c. The value of h in the corresponding Miller Index (hkl) is ...........
In a mineral with chemical formula AT\(_4\)O\(_8\), the ionic radii of A and O are 1.12 Å and 1.40 Å, respectively. The coordination number of cation A is .........
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?
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?
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
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.
A geological formation neither containing nor transmitting water is termed as
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
Which one of the following statements is correct for Class 1B (Parallel) folds?