Introduction to gpsurya blog

$Dear$ $Friends,$ In this blog you will find around 320 solved Geophysics GATE and CSIR-NET and other competitive exams solutions with a better explanation. Please follow and share if you like it. $Thanks,$ $gpsurya$ and $group$

A Brief on myself


Hi There,

This is Surya.

I am working in Geo Physics. I stay in Gandhinagar and working in reputed Company on Seismology. I love write.

This blog is to share my knowledge related to Geo Physics. You can find solutions on GATE , CSIR NET and AP-SET. You can contact by leaving comments on this blog so that I can help you specific to your problem directly. I like to help you.
Whoever want to prepare seriously CSIR-NET and GATE , I think this the best blog for you. GATE and CSIR-NET exams they will follow the some pattern.

If you take GATE exam now a days it is full of problems compared to old GATE papers but same model problems we can find in different GATE papers. In this blog I'm presenting model wise and most important problems with best solutions and neat explanations.

If you take CSIR-NET exam, it will always maintain standard and you will find  repeated problems are very less compared to GATE exam. Before going to write CSIR-NET we have atleast minimum knowledge on subjects whether it is Geology or Geophysics coming under Earth science.


So... Keep reading and leave comments.

Thank you,
Surya

62 comments

  1. Unknown23 November 2018 at 11:28

    Hi Surya! your blog has been a great help to me. can you solve gravity anamaly problems based on different shapes. it would help me a lot. thankyou in advance.

    ReplyDelete
    Replies
    1. GPSURYA24 November 2018 at 02:21

      Hi, already i posted some gravity related problems. some links i'm sending regrading gravity anomalies with different shapes. please see this and if you have any question please forward me.

      https://gpsurya.blogspot.com/2016/07/gate-2015.html

      https://gpsurya.blogspot.com/2016/08/gate-2016.html

      if you like my blog please follow me....

      Delete
  2. Sonai30 November 2018 at 05:50

    Can you please help me to solve the following problems on Gravity Anamoly
    91. The gravity anomaly at a point P distant 1.0 km from the position of the maximum anomaly, along a profile across a horizontal circular cylinder, is twice the anomaly at a point 1.0 km farther away from P. The depth of the cylinder is


    1. 1.0 km 2. km 3. 2 km 4. km
    92. The positions of the maximum anomaly and the minimum anomaly of 183 gamma and13 gamma respectively are located at the distance coordinates 673m and 1073m respectively along a magnetic profile across a two- dimensional sheet-like body. The anomaly of value 170gamma occurs at the distance coordinate 700m. The depth of the sheet is
    1. 400 m 2. 283 m 3. 141 m 4. 100 m

    ReplyDelete
  3. Sonai30 November 2018 at 05:50

    93. A spherical body of 1.0 km radius buried at a depth of 2.0 km produces gravity and magnetic anomalies and , respectively at a horizontal distance of 2.0 km from the position of the centre of the sphere. Another spherical body of identical physical properties and of radius 1.0 mile and depth 2.0 miles produces gravity and magnetic anomalies and , respectively at a horizontal distance of 2.0 miles from the position of its centre. Then the depth of the cylinder is

    94. Two sedimentary layers of infinite horizontal
    extension sit one over the other. The layer
    parameters are
    Layer 1: depth to top = 2000 m; thickness =
    1000 m; density contrast = 0.4gm/cc
    Layer 2: depth to top = 3000m; thickness = 1000m; density contrast = 0.4gm/cc.
    The total gravity anomaly produced by these two layers on the surface is

    1. 84 mGal 2. 42 mGal
    3. 0 mGal 4. 21 mGal

    ReplyDelete
    Replies
    1. GPSURYA30 November 2018 at 09:56

      http://gpsurya.blogspot.com/2016/09/csir-net-2015-dec.html?m=1

      Delete
    2. GPSURYA2 December 2018 at 19:42

      http://gpsurya.blogspot.com/2018/12/csir-net-2015-december-91.html?m=1

      Delete
  4. Anonymous18 January 2019 at 00:16

    Hi dear,
    You are doing a fantastic job.
    Can you solve question no 99 from earthscience csir net june 2012 question paper?

    ReplyDelete
  5. GPSURYA18 January 2019 at 06:07

    Please send me question

    ReplyDelete
  6. Anonymous23 January 2019 at 08:19

    K. thanku very much. I tried nd solved the question.

    ReplyDelete
  7. Anonymous23 January 2019 at 08:25

    I have another question
    in case of isostatic compensation what will be crustal thickness as compared to normal crust.
    which book i should prefer for General aptitude, Oceanography, Meteorology, Geology and Geophysics for csir-ugc net ?

    ReplyDelete
  8. GPSURYA23 January 2019 at 10:47

    Isostatic compensation is depends on mountain thickness.

    ReplyDelete
  9. Sonai24 April 2019 at 05:17

    Can you please help me solve this problem and one more thing can you suggest a book to solve these kind of geophysics problem, please.

    CSIR NET JUNE 201/8 SET B


    If in low pressure centre of the northern hemisphere, winds are from the north at 10 m.s^-1 at a distance 250 km from the low pressure centre, the centrifugal force pr unit mass of air is
    1. -4*10^-5 m.s^-2
    2. -4*10^-4 m.s^-2
    3. -4*10^-3 m.s^-2
    4. -4*10^-6 m.s^-2

    ReplyDelete
    Replies
    1. Anonymous16 July 2024 at 20:49

      It is option 2. It can be done by matching the units: Force/unit mass= (m*a)/m= a.
      So, here t= Distance/velocity
      = (25*10^4)/10
      = 25*10^3 seconds.
      a= velocity/time
      = 10/(25*10^3)
      = 4*10^-4 m.s^-2

      Delete
  10. GPSURYA28 April 2019 at 23:17

    Hi Sonai, this question (whatever you posted) is not related to geophysics, it is Meteorology question.

    ReplyDelete
  11. GPSURYA29 April 2019 at 00:09

    Sonai, i posted solution for your question(CSIR-NET June 2018 ) please check it in my blog.

    ReplyDelete
  12. Sonai30 April 2019 at 08:47

    NET JUNE , 30.SET - A
    For a mineral M, the peak for the (110) plane appears at 2ɵ = X in its XRD pattern, when Cu target is used. If Fe target is used the same peak appears at 2ɵ = Y. If ᨂFe > ᨂCu
    1. X ≥Y 2.X> Y 3.X≤Y 4. X< Y

    ReplyDelete
  13. Sonai30 April 2019 at 08:49

    2015 CSIR NET JUNE, SET - A,132

    ReplyDelete
  14. Sonai7 May 2019 at 04:15

    CSIR NET-DECEMBER - 2017- 79

    The δ18O value of modern seawater is 0 ‰while the average value of that of the polar ice cap is (- 45 ‰). The ice cap holds 2 wt% of thetotal water on the Earth. What is the δ18O of an ice-free ocean? (Other water reservoirscan be ignored)
    1. 0 ‰ 2. 22.5 ‰ 3. 9 ‰ 4.0.9 ‰

    ReplyDelete
  15. Sonai7 May 2019 at 04:23

    CSIR NET-JUNE - 2015
    132. The Brunt Vaisala frequency is 100 S-I of an air parcel that oscillates about a reference level in a stable atmosphere. For a vertical displacement of I In in such an atmosphere, the variation of logarithm of potential temperature is:

    1. 10-3 2. 10-5 3.10-2 4.10-4

    ReplyDelete
  16. GPSURYA7 May 2019 at 10:41

    Sorry i don't know the solutions for these questions..but i will try to solve.

    ReplyDelete
  17. Sonai9 May 2019 at 03:37

    CSIR NET December 2017 - 106 (Set -A)

    Gravity anomalies of value 0.1 mgal and 0.2
    mgal are located at points separated by 300 m
    and 200 m respectively along a profile across
    an anomalous body resembling a horizontal
    circular cylinder. The depth (in m) to the centre
    of the cylinder is
    1. 50 2. 71
    3. 82 4. 100

    ReplyDelete
    Replies
    1. Anonymous16 July 2024 at 20:55

      delta g= {2Gmz/(x^2+z^2)}

      Delete
  18. Sonai9 May 2019 at 04:10

    CSIR NET December 2017 - (Set -A)

    118. An isotropic, homogeneous sample is subjected
    to uniaxial stress along the x-axis. The absolute
    value of the axial strain is found to be thrice the
    normal strain. The ratio (V p /V s ) of the P wave
    and S wave velocity is
    1. 1.5 2. 1.75
    3. 2.0 4. 2.25

    ReplyDelete
    Replies
    1. GPSURYA24 April 2020 at 02:20

      http://gpsurya.blogspot.com/2019/05/csir-net-2017-dec-118.html?m=1

      Delete
  19. Sonai9 May 2019 at 05:33

    CSIR NET December 2017 - (Set -A)

    116. An earthquake occurring at every 100 years,
    leads to a displacement of 2 m over a 40 km
    long fault. The corresponding shear strain
    accumulation rate is

    ReplyDelete
  20. Sonai9 May 2019 at 05:34

    CSIR NET December 2017 - (Set -A)

    113. The positions of the maximum and minimum
    anomaly values are observed at distance
    coordinates 35 m and 135 m respectively along
    a total field anomaly magnetic profile across a
    body resembling a single pole at the magnetic
    equator. Which of the following statements is
    true?
    1. The pole is located at a depth of 50 m below
    the point of maximum anomaly. The profile
    shows an even symmetry about the maximum
    anomaly point.
    2. The pole is located at a depth of 70 m below
    the point of distance coordinate 85 m. The
    profile shows odd symmetry.
    3. The pole is located at a depth of 70 m below
    the point of maximum anomaly. The profile
    does not show any symmetry.
    4. The pole is located at a depth of 50 m below
    the distance coordinate 85 m. The profile
    does not show any symmetry.

    ReplyDelete
  21. Sonai9 May 2019 at 05:35

    CSIR NET December 2017 - (Set -A)

    111. The Bouguer anomaly (in mgal) associated
    with an isostatically compensated 2.0 km thick
    landmass of density 2.7 g/cc (assume that G=
    21 mgal/km/g/cc, if you do not agree with
    option 1)……
    1. cannot be calculated with meagre data.
    2. is zero.
    3. is – 113.
    4. is – 227.

    ReplyDelete
  22. Sonai9 May 2019 at 05:51

    CSIR NET December 2017 - (Set -A)

    114. A and B are the directions of NRM in two deep
    sea sediment samples of ages 0.60 Ma and 1.20
    Ma, respectively, collected from the same
    location. If N is the direction of the present day
    magnetic field, then
    1. both A and B are parallel to N
    2. A is parallel to N, but B is antiparallel
    3. B is parallel to N, but A is antiparallel
    4. both A and B are antiparallel to N

    ReplyDelete
  23. Sonai21 May 2019 at 06:42

    December 2016 CSIR NET


    119. The Rossby radius of deformation for tropical
    atmosphere is
    1. 6300 km 2. 1000 km
    3. 30 km 4. 105
    km

    ReplyDelete
  24. Sonai21 May 2019 at 06:43

    December 2016 CSIR NET

    136. Seawater at 15 C and 35 PSU salinity would
    have the same density as seawater
    1. at 21C and salinity 37 PSU
    2. at 14C and salinity 37 PSU
    3. at 21C and salinity 34 PSU
    4. at 15C and salinity 37 PSU

    ReplyDelete
  25. GPSURYA25 June 2019 at 22:07

    Thank you so much Sci Tech Study....definitely i will post new solutions.

    ReplyDelete
  26. Rahul26 March 2021 at 13:10

    Sir, can you pls tell which book is best for EMT and geophysical inversion for gate? And in which book i can find seismic AVO, seismic attribute, migration method, 3D seismic data acquisition?

    ReplyDelete
    Replies
    1. GPSURYA27 March 2021 at 22:14

      Hi Rahul, Below books are best for GATE and CSIR-NET preparation and other exams also (only for Geophysics) as per my knowledge.

      1. Fundamental of Geophysics by William Lowrie.
      2. An Introduction to Geophysical exploration by Philip Kearey et al.
      3. The Solid Earth: An Introduction to Global Geophysics by C.M.R. Fowler.
      4.Applied Geophysics by W.M. Telford et al. (Best book for all methods in Geophysics especially Electro Magnetics)
      5. Whole Earth Geophysics : An Introductory Textbook for Geologists and Geophysicists by Robert J. Lillie (Best book for easily understanding the concepts in Geophysics).
      6. An Introduction to Applied and Environmental Geophysics by John M. Reynolds

      I have less knowledge on Inversion technique. If, I get any book i will forward you.

      All the best.

      Delete
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    Bhai kch UPSC- GSI related solutions h ?

    ReplyDelete
    Replies
    1. GPSURYA25 May 2022 at 02:24

      Presently I'm solving the UPSC Assistant Geophysicist solutions. If you have any doubt, send me that particular problem I will try to solve.

      Delete
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    Hi Surya :) Happy New Year!

    I am Jayendra, a master's student in Remote Sensing at TU Munich.
    I am currently working on bridge monitoring using Sentinel 1 data before its collapse using PSI. I have checked your comments snap forum regading this topic and I am super confident that you can help me in just clarifying some doubts.

    Let me know what is the best mode to communicate with you.
    Thank you :)

    ReplyDelete
    Replies
    1. GPSURYA15 January 2023 at 08:30

      Oh good. you can contact through mail (suribabu.9396@gmail.com)

      Delete
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