PUNJAB PUBLIC SERVICE COMMISSION
COMBINED COMPETITIVE EXAMINATION
FOR RECRUITMENT TO THE POSTS OF PROVINCIAL MANAGEMENT SERVICE-2025
SUBJECT: GEOLOGY (PAPER-I)
TIME ALLOWED: THREE HOURS MAXIMUM MARKS: 100
NOTE:I. All the parts (if any) of each Question must be attempted at one place instead of at different places
II. Write Q. No. in the Answer Book in accordance with Q. No. in the Q. Paper.
III. No Page/Space be left blank between the answers. All the blank pages of Answer Book must be crossed.
IV. Extra attempt of any question or any part of the question will not be considered.
Attempt FIVE Questions in all. Attempt in Urdu or English where necessary, use neat sketches to elaborate the answers
Q No. 1: Briefly discuss the internal structure of the Earth and its composition. How was the thickness of the different internal layers of the earth was estimated?
Q No. 2: How does the theory of Plate Tectonics explain the formation and deformation of the Earth’s crust? Discuss with examples where crust is being created, destroyed, or remains unchanged.
Q No. 3: Discuss the ecological structure of ancient biological communities and the theories of community structures.
Q No. 4: Discuss the Precambrian and Cambrian rocks of Salt Range, Pakistan.
Q No. 5: How does an igneous rock get a porphyritic texture? What characteristic of the silicate minerals in a gabbro makes it so much darker in colour than a granite?
Q No. 7: What is Bowen’s Reaction Series (BRS)? How does BRS help predict the order of mineral crystallization and melting, formation of silicate structures (polymerization), evolution of plagioclase composition, and mineral stability at surficial temperatures and pressures?
Q No. 8: Describe the following:
(i) Magmatic ore deposits (ii) Polymorphism and crystal habit
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