GG : GEOLOGY AND GEOPHYSICS
Q. 1 – Q. 25 carry one mark each.
Q.1 The increase in the length of a day on the earth at a rate of 2.4 milliseconds/100 years is due to
(A) prolate tidal bulge
(B) tidal friction
(C) spring tide
(D) bodily earth tide
Q.2 Which of the following rocks contributes the highest amount of radioactive heat in the earth’s crust?
(A) basalt
(B) gabbro
(C) dunite
(D) granite
Q.3 The P-wave velocity of the earth’s mantle at the Mohoroviĉić discontinuity is
(A) 5.5 km/s
(B) 6.0 km/s
(C) 7.0 km/s
(D) 8.0 km/s
Q.4 Variation of the geomagnetic field observed over the last 500 years indicates that the dipole moment of earth’s magnetic field has been
(A) decreasing
(B) increasing
(C) constant
(D) fluctuating randomly
Q.5 Which of the following statements is TRUE for the temperature variation with altitude in the earth’s atmosphere?
(A) Temperature increases in both stratosphere and mesosphere
(B) Temperature decreases in stratosphere and increases in mesosphere
(C) Temperature increases in stratosphere and decreases in mesosphere
(D) Temperature decreases in both stratosphere and mesosphere
Q.6 The deflection of ocean currents in the northern and southern hemispheres is due to
(A) thermohaline circulation
(B) Coriolis effect
(C) El Nino effect
(D) monsoon effect
Q.7 Tsunamis are
(A) gravity waves
(B) acoustic waves
(C) capillary waves
(D) internal waves
Q.8 The planet which contributes maximum to the angular momentum of the solar system is
(A) Earth
(B) Mars
(C) Jupiter
(D) Saturn
Q.9 The depositional feature that forms where a stream emerges from a mountainous region onto a plain is called
(A) alluvial fan
(B) natural levee
(C) delta
(D) point bar
Q.10 Hanging valleys are formed by the geological action of
(A) river
(B) glacier
(C) ocean
(D) wind
Q.11 The surface of discontinuity between older folded sedimentary strata and younger horizontal strata is known as
(A) disconformity
(B) parallel unconformity
(C) angular unconformity
(D) nonconformity
Q.12 The hardest oxide mineral in the Mohs’ scale of hardness is
(A) corundum
(B) topaz
(C) quartz
(D) diamond
Q.13 The dominant constituent of ultramafic rocks in the earth’s mantle is
(A) orthoclase
(B) olivine
(C) plagioclase
(D) biotite
Q.14 A highly vesicular rock formed by solidification of viscous lava is
(A) tuff
(B) obsidian
(C) volcanic breccia
(D) pumice
Q.15 The most suitable radioactive method for dating Holocene events is
(A) U-Pb
(B) Sm-Nd
(C) Rb-Sr
(D) C-14
Q.16 Which of the following stratigraphic units is NOT of Proterozoic age?
(A) Tipam Group
(B) Bhima Group
(C) Nallamalai Group
(D) Semri Group
Q.17 RampuraAgucha in Rajasthan is known for the ore deposit of
(A) gold
(B) tungsten
(C) zinc
(D) iron
Q.18 The geological age of the major hydrocarbon reservoir in the Bombay High oil field is
(A) Cretaceous
(B) Holocene
(C) Oligocene
(D) Miocene
Q.19 The geophysical method for the exploration of disseminated sulfide deposits is
(A) induced polarization
(B) self- potential
(C) gravity
(D) magnetic
Q.20 In a borehole, high pressure gas zone is identified by
(A) sonic logging
(B) resistivity logging
(C) temperature logging
(D) density logging
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