List of top Geology Questions

A block of rock with a mass of 72 kg slides on a surface inclined at an angle of 30° as shown in the figure. Assuming no cohesion and friction, the force \( F \) is ........... Newton (answer in one decimal place; acceleration due to gravity = 9.8 m/s²). 

 

A diamondiferous lamproite is ultrapotassic and has a molar \( \text{K}_2\text{O}/\text{Na}_2\text{O} \) ratio of 11. If the \( \text{Na}_2\text{O} \) content of the rock is 0.62 wt%, the \( \text{K}_2\text{O} \) content is .......... wt% (answer in one decimal place; molecular weight of \( \text{Na}_2\text{O} = 61.98 \), and \( \text{K}_2\text{O} = 94.20 \)).
The mass of a fully dried rock sample of volume 100 cm³ is 300 g. The mass of the sample, when fully saturated with water of density 1.00 g/cm³, is 325 g. Assuming no volume change, the computed porosity of the rock is ........ % (answer in one decimal place).
A confined sandstone aquifer with a uniform cross-sectional area of 7 m² and a hydraulic conductivity of 2 m/s, transmits water across a hydraulic gradient of 3.2. Assuming steady state Darcian flow, the volumetric flow rate through the aquifer is .......... m³/s (answer in one decimal place).
600 tons of low grade iron ore (40% Fe) are blended with 400 tons of high grade iron ore (65% Fe). The grade of the blended ore is ........ % Fe (answer in one decimal place).
A continuous 10 m thick sequence of shale was deposited in 10,000 years at uniform rate of sedimentation. The number of samples that must be collected at equal stratigraphic intervals to sample the succession every 500 years is .............. .
The number of alpha (\(\alpha\)) particles emitted to produce a daughter isotope of \(^{206}\text{Pb}\) from a parent isotope of \(^{238}\text{U}\) by radioactive decay is ........
The dip slip on a fault \( 000^\circ, 30^\circ E \) is 10 m. Assuming slip equals separation here, the throw on the fault is .............. m (answer in one decimal place).
The valency of iron in hematite is ............
When plotted on a map of 1:50000 scale, a 2 km long dyke exposed on a horizontal surface has a length of ........... cm (answer in one decimal place).
A crustal rock is at a lithostatic pressure of 3 kbar and a temperature of 275°C. If the lithostatic pressure increases at a uniform rate of 0.3 kbar/km, and the surface temperature is 25°C, the geothermal gradient (in °C/km) is ....... (answer in one decimal place).
Major mass extinction events occurred in the
Which one of the following processes is responsible for the formation of syngenetic Ni-Cu sulphide ore in gabbro-norite rocks?
Which one of the following is produced by a closed-system metamorphic reaction between muscovite and quartz?
The assemblage staurolite + garnet + biotite + muscovite + quartz in pelites is stable in
Conglomerates are commonly deposited in
Which one of the following sedimentary structures is NOT used for determining top and bottom of beds?
Wilson orogenic cycle in continents is initiated by
The correct order of marine benthic habitats with increasing water depths is
Identify the pair from the following list that is NOT correctly matched.
Which one of the following invertebrates has the most primitive visual system?
Fissility is best shown by
Petroleum is NOT commercially produced from
Isostasy involves ................. continental mountain belts.
The texture characterized by exsolved lamellae of albite in K-feldspar is known as