Exam Details
| Subject | geophysics | |
| Paper | paper 3 | |
| Exam / Course | combined geo-scientist and geologist | |
| Department | ||
| Organization | union public service commission | |
| Position | geologist | |
| Exam Date | 2017 | |
| City, State | central government, |
Question Paper
Ql. Define the American Petroleum Institute (APO unit of gamma radiation,by considering the master calibration of gamma ray tool
Given the bed resolution to be 1fl. and time constant to be 2 estimate the logging speed of a radiation/radioactivity logging tool.
State the reason for not applying elevation correction usually to total magnetic intensity(TMI) data.
State the basic premise of radiocarbon dating method.
(c)state the basic heat flow equation with appropriate units for its entities.
Name any three non-explosive offshore seismic sources and two seismic receivers.
Can we digitize all signals properly State your answer with brief justification.
We have a signal with frequencies ranging between 18 kHz and 24 kHz. If we sample this signal such that there would be two replicas of the signal (between -18 kHz and +18 what should be the sampling
frequency(ies)
What do you understand by scale of a map Out of two maps of the same area having scales 1 2,50,000, and 1 26,000, which one will be useful for your detailed mapping? Justify your answer.
what is meant by the term FCC in remote sensing.why does vegetation always appear red in FCC
Q2. Briefly discuss the airborne phase component electromagnetic system with the help of a schematic block diagram.
State the Fourier differentiation theorem.
Prove the Fourier differentiation theorem.
Give the physical consequence and application of this theorem.
What do you understand by 'Atmospheric Window'.
What is meant by BAND in Remote Sensing Discuss briefly the different types of BANDs used by the sensors of Indian and United States' RemoteSensing satellites.
Q3. Briefly discuss the physical principles of an air gun and the need for air gun arrays in offshore seismic investigations.
Explain the geological field condition or situation, where directional noise is required to be reduced by aerial geophone array.
Also draw and label two standard geophone aerial arrays used for reducing such directional noises.
Suppose you need to have a signal-to-noise ratio factor of then for reducing random noise, how many geophones are required in a group.
Define Geographic information system (GIS).Name the different components of GIS
What is 'GeostationarySatellite'? Mention three important uses of geostationary satellites. Give an example of an Indian Geostationary Satellite.
Q4. Provide the mathematical expressions of 2-D analytic signal supported by physical significance in the following cases:
Magnetic anomaly interpretation
Seismic data analysis
State the reason(s) for applying IGRF correction to offshore total magnetic intensity data.
Suppose a time sequence is defined as
1 0 k 10
fk
0 10 k 100
Determine its Amplitude spectrum.
What are the different types of remote sensing sensors Discuss briefly, the different types of sensors used by Indian Remote Sensing satellites. Also give their resolutions.
What is a Multi spectral Scanner used in Remote Sensing? Describe in brief the operational procedure of a multi spectral scanner.
Q5. In which environment are radioactive elements formed
Write a short note on position location methods for offshore geophysical surveys.
Enumerate the procedure of Auto Regressive modelling for any random process with a supporting seismic example.
Provide the formula for shale fraction estimation on the basis of a GR log reading against, a formation by using the entire OR log
Discuss brieOy the Electromagnetic energy and its interactions with terrain features.
Q6. What is Meissner effect Show that the perfect diamagnetism and zero resistivity are the two independent properties of the superconducting state.
Show that for a normal optical source with temperature about 10^3 K and wavelength 6000 A., the emission is predominantly due to spontaneous transitions.
What do you understand by Q-switch.in.g the laser cavity How is it achieved using an acousto-optical device?
Explain how voltage amplification is obtained in a transistor common base amplifier although the current gain is less than unity.
Give the logic symbols, Boolean expressions and the truth tables of a two-input NOR and a two-input NANO gate.
What do you mean by radar cross-section of targets Explain the various parameters affecting the radar cross-section of a target.
Two copper conducting wires are separated by an insulating oxide layer (CuO). Modelling the oxide layer as a square barrier of height 10 eV, estimate the transmission coefficient for penetration by 7 eV electrons, if the layer thickness is 1 nm.
prove that
Lz,p^2
where Lz is the operator corresponding to z-component of the angular momentum, and p is the operator corresponding to the linear momentum.
Q7. What is Bragg's law of diffraction? Why can it not be used in the case of visible light? In a powder diffraction experiment using CuK,. radiation of wavelength
1·54 the first five lines are observed from a monoatomic cubic crystal when the angle 20 is 38·0, 44·2, 64·4, 77·2 and 81·4 degrees. Determine the crystal structure and the lattice parameter.
What is the position of the Fermi level in an intrinsic semiconductor How docs its position change when donors, and acceptors are added to the semiconductor Row does the Fermi level vary, if the
temperature is raised?
Describe the construction and working of a ruby laser, and show how population inversion is achieved here.
Q8. Define the acceptance angle and the numerical aperture of an optical fibre. How are they related to the refractive indices of the core and the cladding.Explain how light is guided by an optical fibre.
Explain the principle of operation of the Light Emitting Diode (LED). Why is silicon not used as an LED material
Obtain the eigen function with the help of Schrodinger's wave equation, for a particle of mass m enclosed in a box of length L,and represent the first three eigen functions graphically.Also prove that the energy eigen values of the particle are discrete.
Q9. Explain the static characteristics of an n-channel Junction Field Effect Transistor(JFET).What are saturation voltage and saturation current, and how do they vary when the reverse gate-bias increases Why is a
forward bias not applied to the gate of a JFET?
When a voltage V1 40 µV is applied to the non-inverting input terminal and a voltage V2 40 µV is applied to the inverting terminal of an operational amplifier, an output voltage V0 100 mV is obtained. But when V1 V 40 µV, one obtains Vo 0·4 mV. Calculate the voltage gains for the difference and the common-mode signals, and the common-mode rejection ratio.
A transistor is operating in the common emitter mode, shown in the figure. Calculate VCE if current gain, 125, assuming VBE 0·6V.
src='./qimages/7981-9c.jpg'>
Explain Kepler's laws of planetary motion. illustrate their relevance to an artificial satellite orbiting the Earth. What do you understand by
geosynchronous and geostationary orbit?
Q10. Distinguish between the characteristic features of diamagnetism, paramagnetism and ferromagnetism. Give an example of each type of material. Comment on the temperature variation of susceptibility for each type of material.
Determine the interplanar spacing between two parallel planes with Miller indices k in a cubic crystal of side
Which is the most densely packed structure amongst the various cubic structures? Determine the packing fraction of this structure.
Establish both, the time-independent and time-dependent Schrodinger wave equations for a non-ralativistic particle.
Given the bed resolution to be 1fl. and time constant to be 2 estimate the logging speed of a radiation/radioactivity logging tool.
State the reason for not applying elevation correction usually to total magnetic intensity(TMI) data.
State the basic premise of radiocarbon dating method.
(c)state the basic heat flow equation with appropriate units for its entities.
Name any three non-explosive offshore seismic sources and two seismic receivers.
Can we digitize all signals properly State your answer with brief justification.
We have a signal with frequencies ranging between 18 kHz and 24 kHz. If we sample this signal such that there would be two replicas of the signal (between -18 kHz and +18 what should be the sampling
frequency(ies)
What do you understand by scale of a map Out of two maps of the same area having scales 1 2,50,000, and 1 26,000, which one will be useful for your detailed mapping? Justify your answer.
what is meant by the term FCC in remote sensing.why does vegetation always appear red in FCC
Q2. Briefly discuss the airborne phase component electromagnetic system with the help of a schematic block diagram.
State the Fourier differentiation theorem.
Prove the Fourier differentiation theorem.
Give the physical consequence and application of this theorem.
What do you understand by 'Atmospheric Window'.
What is meant by BAND in Remote Sensing Discuss briefly the different types of BANDs used by the sensors of Indian and United States' RemoteSensing satellites.
Q3. Briefly discuss the physical principles of an air gun and the need for air gun arrays in offshore seismic investigations.
Explain the geological field condition or situation, where directional noise is required to be reduced by aerial geophone array.
Also draw and label two standard geophone aerial arrays used for reducing such directional noises.
Suppose you need to have a signal-to-noise ratio factor of then for reducing random noise, how many geophones are required in a group.
Define Geographic information system (GIS).Name the different components of GIS
What is 'GeostationarySatellite'? Mention three important uses of geostationary satellites. Give an example of an Indian Geostationary Satellite.
Q4. Provide the mathematical expressions of 2-D analytic signal supported by physical significance in the following cases:
Magnetic anomaly interpretation
Seismic data analysis
State the reason(s) for applying IGRF correction to offshore total magnetic intensity data.
Suppose a time sequence is defined as
1 0 k 10
fk
0 10 k 100
Determine its Amplitude spectrum.
What are the different types of remote sensing sensors Discuss briefly, the different types of sensors used by Indian Remote Sensing satellites. Also give their resolutions.
What is a Multi spectral Scanner used in Remote Sensing? Describe in brief the operational procedure of a multi spectral scanner.
Q5. In which environment are radioactive elements formed
Write a short note on position location methods for offshore geophysical surveys.
Enumerate the procedure of Auto Regressive modelling for any random process with a supporting seismic example.
Provide the formula for shale fraction estimation on the basis of a GR log reading against, a formation by using the entire OR log
Discuss brieOy the Electromagnetic energy and its interactions with terrain features.
Q6. What is Meissner effect Show that the perfect diamagnetism and zero resistivity are the two independent properties of the superconducting state.
Show that for a normal optical source with temperature about 10^3 K and wavelength 6000 A., the emission is predominantly due to spontaneous transitions.
What do you understand by Q-switch.in.g the laser cavity How is it achieved using an acousto-optical device?
Explain how voltage amplification is obtained in a transistor common base amplifier although the current gain is less than unity.
Give the logic symbols, Boolean expressions and the truth tables of a two-input NOR and a two-input NANO gate.
What do you mean by radar cross-section of targets Explain the various parameters affecting the radar cross-section of a target.
Two copper conducting wires are separated by an insulating oxide layer (CuO). Modelling the oxide layer as a square barrier of height 10 eV, estimate the transmission coefficient for penetration by 7 eV electrons, if the layer thickness is 1 nm.
prove that
Lz,p^2
where Lz is the operator corresponding to z-component of the angular momentum, and p is the operator corresponding to the linear momentum.
Q7. What is Bragg's law of diffraction? Why can it not be used in the case of visible light? In a powder diffraction experiment using CuK,. radiation of wavelength
1·54 the first five lines are observed from a monoatomic cubic crystal when the angle 20 is 38·0, 44·2, 64·4, 77·2 and 81·4 degrees. Determine the crystal structure and the lattice parameter.
What is the position of the Fermi level in an intrinsic semiconductor How docs its position change when donors, and acceptors are added to the semiconductor Row does the Fermi level vary, if the
temperature is raised?
Describe the construction and working of a ruby laser, and show how population inversion is achieved here.
Q8. Define the acceptance angle and the numerical aperture of an optical fibre. How are they related to the refractive indices of the core and the cladding.Explain how light is guided by an optical fibre.
Explain the principle of operation of the Light Emitting Diode (LED). Why is silicon not used as an LED material
Obtain the eigen function with the help of Schrodinger's wave equation, for a particle of mass m enclosed in a box of length L,and represent the first three eigen functions graphically.Also prove that the energy eigen values of the particle are discrete.
Q9. Explain the static characteristics of an n-channel Junction Field Effect Transistor(JFET).What are saturation voltage and saturation current, and how do they vary when the reverse gate-bias increases Why is a
forward bias not applied to the gate of a JFET?
When a voltage V1 40 µV is applied to the non-inverting input terminal and a voltage V2 40 µV is applied to the inverting terminal of an operational amplifier, an output voltage V0 100 mV is obtained. But when V1 V 40 µV, one obtains Vo 0·4 mV. Calculate the voltage gains for the difference and the common-mode signals, and the common-mode rejection ratio.
A transistor is operating in the common emitter mode, shown in the figure. Calculate VCE if current gain, 125, assuming VBE 0·6V.
src='./qimages/7981-9c.jpg'>
Explain Kepler's laws of planetary motion. illustrate their relevance to an artificial satellite orbiting the Earth. What do you understand by
geosynchronous and geostationary orbit?
Q10. Distinguish between the characteristic features of diamagnetism, paramagnetism and ferromagnetism. Give an example of each type of material. Comment on the temperature variation of susceptibility for each type of material.
Determine the interplanar spacing between two parallel planes with Miller indices k in a cubic crystal of side
Which is the most densely packed structure amongst the various cubic structures? Determine the packing fraction of this structure.
Establish both, the time-independent and time-dependent Schrodinger wave equations for a non-ralativistic particle.