BGYCT-133 · December 2023 · English
IGNOU BGYCT-133 December 2023 Previous Year Question Paper
CRYSTALLOGRAPHY, MINERALOGY AND ECONOMIC GEOLOGY
Structured previous year question paper for BGYCT-133, December 2023 session.
Max marks: 50 · Questions: 4
Verified: 10 Aug 2026
B. SC. (GENERAL)
(BSCG)
Term-End Examination
December, 2023
BGYCT–133 : CRYSTALLOGRAPHY,
MINERALOGY AND ECONOMIC GEOLOGY
Time : 2 Hours Maximum Marks : 50
Note :
(i) All questions are compulsory.
(ii) Marks allotted for each question are
indicated against it.
(iii) Draw well labelled diagrams, wherever
necessary.
Q1.Briefly answer any five of the following questions : 5×2=10
(a) What is Steno’s law of constant angles ?
(b) Define centre of symmetry.
(c) What is space lattice ? [ 2 ] BGYCT–133
(d) What are Placer Deposits ?
(e) Define Pleochroism.
(f) What are anisotropic substances ?
(g) What is Gossan ?
(h) What are industrial minerals ?
Q2.Write short notes on any four of the following :
(a) Solid angle
(b) Symmetry elements of baryte
(c) Physical properties of kayanite
(d) Streak of mineral
(e) Ores and uses of copper
(f) Ranks of coal
(g) Optical properties of biotite
Q3.Answer any one of the following : 1×10=10
(a) Discuss the common rock -forming silicate mineral groups. [ 3 ] BGYCT–133
(b) Describe the optical properties studied under plane polarised light with the help of neat and well labelled diagrams.
Q4.(a) Answer any one of the following :
(i) Explain the law of constancy of Interfacial angle.
(ii) Discuss the diaphaneity in minerals.
(b)
(i) Explain Twinning in minerals.
(ii) Describe the nature and morphology of concordant ore bodies. 2×5=10 [ 4 ] BGYCT–133 2023 –133
(iii) [ 5 ] BGYCT–133 5×2=10 (Gossan) (Kyanite) [ 6 ] BGYCT–133 1×10=10