Calculation of true thickness of the bed

CSIR-NET 2016 DECEMBER

TEST-4

  

time limit is 8 minutes

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1. A potential difference of 10 mV is measured in an electrical survey with Wenner configuration using an electrode spacing of 10 m and 1.0 amp current. What would be the potential difference if the measurements are made with a Schlumberger configuration employing current electrode spacing of AB =30 m, potential electrode spacing of MN = 4 m and the same current?
   1.   3.62 mV
   2.   27.6 mV
   3.   36.2 mV
   4.   2.76 mV
2. Which one of the given gases in the atmosphere is the most important for chemical weathering on the surface of the Earth?
   1.   NO2
   2.   CO2
   3.   Water vapour
   4.   SO2
3. The present day Martian(Mars) surface is not known to contain water either in liquid or solid form, however, ice has been reported from the polar regions of the planet. This ice is likely to be frozen
   1.   Carbon dioxide
   2.   Sulphur dioxide
   3.   Hydrogen
   4.   Oxygen
4. Self potential (SP) logs from two shaly sandstone reservoirs A and B record their pseudo-static self potential (PSP) and static self potential (SSP). The ratio of PSP to SSP in A and B are 0.4 and 0.7, respectively. For both A and B, the mud filtrate resistivity is more than the formation water resistivity (Rmf > Rw). This implies that the shale volume of A is
   1.   twice that in B
   2.   one-fourth of that in B
   3.   four times of that in B
   4.   half of that in B
5. Mid-latitude deserts are located
   1.   in interior of continents
   2.   on the eastern sides of continents
   3.   on the western sides of continents
   4.   in glaciated regions
6. Shear strain is measured by changes in
   
   1.   angle
   2.   volume
   3.   length
   4.   viscosity
7. The total observed runoff volume during a storm of 5-hr duration with a uniform intensity of 16 mm/hr is 20 *10^6 m3 . If the area of the basin is 400 km^2 , then the infiltration (mm) is
   
   1.   20
   2.   30
   3.   15
   4.   25
8. The correct order of decreasing stability of minerals during chemical weathering is
   
   1.   feldspar, olivine, amphibole, pyroxene
   2.   quartz, pyroxene, feldspar, olivine
   3.   quartz, pyroxene, olivine, feldspar
   4.   quartz, feldspar, pyroxene, olivine
9. Mid-oceanic ridges, areas of crustal extension, are usually associated with
   1.   normal and strike-slip faults
   2.   normal and transform faults
   3.   reverse and strike-slip faults
   4.   normal and reverse faults
10. A newly discovered planet has an atmosphere made of a gas whose specific heat cP is 1000 J Kg-1 K-1 .If the lapse rate is 20 K/km , what is its acceleration due to gravity?
    1.   5 m/s2
    2.   25 m/s2
    3.   20 m/s2
    4.   10 m/s2