GATE QUESTIONS

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GATE Half-Life PROBLRMS

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GATE 2013 Q.16 If a radioactive isotope has a decay constant of 1.55 × 10-10 year-1, its half-life (in years) would be (A) 4.57 × 109 (B) 4.47 × 109 (C) 4.57 × 1010 (D) 4.47 × 1010 GATE 2015 Q.20 The pair of curves that depicts the radioactive decay and growth of a parent-daughter pair in the following figure is (N – Number of nuclides, Time in multiples of half-life). (A) P, Q (C) P, S (B) P, R (D) S, Q GATE 2016 Q.10 Which one of the following parent-daughter systems has the longest half life? (A) 147Sm → 143Nd (B) 40K → 40Ar (C) 87Rb → 87Sr (D) 187Os → 187Re GATE 2016 Q.52 The fraction of a radioactive nuclide remaining after 10 half-lives is closest to (A) 0.1 (B) 0.01 (C) 0.001 (D) 0.0001 GATE 2013 Q.16 If a radioactive isotope has a decay constant of 1.55 × 10-10 year-1, its half-life (in years) would be (A) 4.57 × 109 (B) 4.47 × 109 (C) 4.57 × 1010 (D) 4.47 × 1010 GATE 2018 Q.80 The ratio of the number of daughter nuclides to the number of ...
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GATE- ALL GRAVITY RELATED QUESTIONS

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GATE 2019 Q.5 The acceleration due to gravity (g) begins to fall sharply towards the centre of the Earth from the ________ discontinuity. (A) Conrad (B) Mohorovicic (C) Gutenberg (D) Lehmann GATE 2019 Q.15 Which one of the following is only a correction and not a reduction in the computation of gravity anomalies with respect to a datum? (A) Free air (B) Bouguer (C) Terrain (D) Isostatic GATE 2019 Q.71 In gravity anomalies, the ‘Indirect effect’ mainly arises from ________. (A) the sources outside the area of investigation (B) improper instrument drift C) effect of mass lying between the geoid and ellipsoid (D) short-wavelength uncompensated masses in the subsurface GATE 2019 Q.74 If ΔJ and Δσ are the uniform magnetization and density contrasts respectively, of a point source, the relation between the vertical components of the gravity (gz) and magnetic (Tz) anomalies can be expressed (neglecting long-wavelength component) as _________. (G is Gravitational constant) ...
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GATE Resistivity sounding curve

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GATE 2011 Q.42 The apparent resistivity sounding curve representing the resistivity structure  ρ 1 >  ρ 2 <  ρ 3 <  ρ 4 is (A) HK type (C) KH type (B) HA type (D) KQ type GATE 2013 Q.33 In a 4-layer subsurface model, which combination of A-, H-, K- and Q- type electrical resistivity sounding curves is NOT possible? (A) HA (B) AK (C) KQ (D) HQ GATE 2016 Q.44 The five-layer Schlumberger resistivity sounding curve given below represents ________. (A) HAQ-type (B) HKQ-type (C) HKH-type (D) HAK-type 2009 Q.11 Over a three layered earth. comprising of top dry soil followed by saturated weathered layer and hard rock basement, a resistivity sounding experiment is performed. The obtained VES curve is_________ (A) K-typc (C) H-type (B) A-type (D) Q-type 2007 Q.13 The apparent resistivity type curve recorded over the following three layer section (top - dry soil; middle - saturated aquifer; bottom - bed rock) is Q.14 (A) A-Type (B) Em»...
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