List of top Questions asked in IIT JAM GG

Which of the following is a fluorite deposit?

According to Dunham’s classification, which one of the following limestones is grain-supported and contains mud?

Which one of the following vertebrate fauna is a Proboscidea?

Which one of the following is an undifferentiated meteorite?

Which one of the following is the CORRECT sequence of igneous rocks with increasing SiO2 content?

Which one of the following is NOT an ultramafic rock?

The longitude of the person’s position at a place 3 hours ahead of UTC (Prime Meridian) is

Which one of the following does NOT have a polymorph?

Which one of the following CORRECTLY describes the footwall block relative to the hanging wall of a planar normal fault?

The density contrast across which one of the following transitions in the Earth is maximum?

The name of an igneous rock having a modal composition of 55% olivine, 40% orthopyroxene and 5% plagioclase, as per the IUGS classification scheme, is

Match the morphological features in Group I with the corresponding taxa in Group II.

Group I	Group II
P. Dissepiment	1. Echinodermata
Q. Delthyrium	2. Trilobita
R. Pygidium	3. Brachiopoda
S. Ambulacrum	4. Anthozoa

Neutron-rich unstable nuclides undergo

The dips of the normal and overturned limbs of a horizontal-overturned antiform are 30⁰ and 70⁰, respectively. The interlimb angle of this fold is _______ degrees. (In integer)

Match the minerals in Group I with their highest order of interference color in Group II (for 0.03 mm mineral thickness).

Group I	Group II
P. Sillimanite	1. First order
Q. Quartz	2. Second order
R. Muscovite	3. Greater than third order
S. Calcite	4. Third order variegated

In the given isobaric binary temperature-composition (T-X) phase diagram involving solids A and B, the fraction of melt remaining at point Q for a magma having initial composition P will be _______. (Round off to one decimal place)

An orebody contains pyrite and chalcopyrite in the same molar proportions. The percentage concentration of Cu in the ore will be ________. (Round off to the nearest integer) (Use atomic weight, in g/mol, of Cu = 63.55, Fe = 55.85, S = 32.06)

For an anisotropic crystal of thickness 0.04 mm and refractive indices of 1.636 and 1.486 along the slow and fast directions, respectively, the retardation produced is ______ nm. (In integer)

A rock element during deformation, experienced a pressure change of $5×10^4 N/m^2$, due to which its volume changed from 4 cm3 to 3.9 cm3. The bulk modulus of the rock is ________ ×$10^6 N/m^2$. (In integer)

A partially saturated soil sample has a volume of 1200 cc. The volume of water present in the sample is 300 cc. The mass of solid in the sample is 1908 g and the particle density is 2.65 g/cc. The porosity (n) of the soil sample is _______ %. (In integer)

The mole fraction of forsterite in olivine with MgO = 29.17 weight %, FeO = 34.65 weight % and $SiO_2$ = 36.18 weight % is _______ . (Round off to two decimal places) (Use molecular weight, in g/mol, of MgO = 40.31, FeO = 71.85 and $SiO_2$ = 60.00)

The thickness of a dipping coal bed measured along a vertical drill hole is 15 m. If the dip of the coal bed is 30⁰, the orthogonal thickness of the coal bed is ___________ m. (Round off to the nearest integer)

The fraction of $^{24}𝑁𝑎_{11}$ atoms remaining after a decay interval of 5.0 hours will be ______ . (Round off to three decimal places) (Use $t_{1/2}$ = 15.0 hours)

The lithostatic pressure at a depth of 36.5 km in the continental crust having an average density of 2800 $kg/m^3$, is _____ GPa. (Round off to the nearest integer) (Use g = 9.8 $m/s^2$)

Clinopyroxene crystallizing from a basaltic magma has Sm concentration of 24 ppm. If the clinopyroxene-melt partition coefficient for Sm is 1.2, the concentration of Sm in the basaltic magma will be ______ ppm. (In integer)