JAM Mock Test-3

This section contains a total of 20 Numerical Answer Type (NAT) questions. For these NAT type questions, the answer is a real number which needs to be entered using the virtual keyboard on the monitor. No choices will be shown for these types of questions. Questions Q.41 – Q.60 belong to this section and carry a total of 30 marks. Q.41 – Q.50 carry 1 mark each and Questions Q.51 – Q.60 carry 2 marks each. There is no negative marking in this section.

Q41. Calculate the lithostatic pressure (in Pascal) at the base of the average continental      crust(35km)?(Given density of crust – 2.8gm/cc, g-10m/s2)

Q42. In an area aquifer having 30% porosity and 10% specific retention lies at 11 m depth. Then, the specific yield of the aquifer is _________.

Q43. In Oligoclase, the anorthite content is not more than ___________

Q44. If the distance between two points on a 1:20000 map is 5 cm then the real distance between these two points on the field will be ________ Km.

Q 45. In a Gypsum crystal, the angle between the crystallographic axes ‘a’ and ‘c’ is ________ degrees.                        

Q 46. If we get 22 kg of Zn from 1.5 tonnes of ore, then the grade of Zn will be _________ (in %)

Q47. In Hypersthene, the ratio Si:O is 1: ____________.

Q48. The age of Eparchian unconformity is __________ Ga.

Q49. A mafic rock has 30 % Diopside and 70% Anorthite. On partial melting, the ratio of Diopside and Anorthite in the first melt is __________ (up to 2 decimal)

Q50. If a basalt dyke outcrops as a straight line on a terrain with irregular topography, then the dip of the dyke is __________ degree.

Q51. Determine magnesium number of a rock whose chemical composition is as follows SiO2 = 30 wt.%, MgO= 29 wt.%, FeO = 24 wt.%, Al2O3 = 11 wt.% and MnO= 6 wt.%.  Magnesium number (Mg#) _____ (up to two decimal places). Given molecular weight of MgO and FeO is 40.3 and 71.8

Q52. The composition of a felsic rock is plotted in the following triangular diagram. Find out the modal percentage of Quartz mineral present in the rock.

Q53. 8 Ma old sedimentary bed has a thickness of 2 km. The rate of sedimentation is __________ (in m/year up to 4 decimal places)

Q54. The half-life of 232Th is 14 Ga. Then, the decay constant (λ) is __________.

Q55. Calculate the no of moles of Si in 100 gm of Quartz. (Given, Atomic weight of Si = 28 amu, O= 16 amu).

Q56. Find out the univariant curves in a one component (SiO2) system with 7 possible phases.

Q57. A coal bed dips 30 degree towards N45E. The apparent dip of same bed towards N will be_________ degrees

Q58. An earthquake with magnitude of 7 in Richter scale was recorded in the seismic station. Epicentre is located 50km away. If focus of earthquake is making 45 angles with the seismograph, the depth of the centre is ____________ meters.

Q59. In the following schematic diagram, the degree of freedom at the demarcated position is _________.                   

Q60. In the given geological map, the throw on the fault (F-F) is _______ meters.