First Grade Draftsman/Overseer civil 2017 — Kerala PSC PYQ Practice with Answers

Correct answer (Option B):\nIn ancient times and classical texts, the Periyar river was widely referred to as 'Churni' or 'Choorni'. It is the longest river in Kerala and plays an invaluable role in the state's geography, culture, and economy. Option B is correct.\n\nWhy others are wrong:\nOption A (Bharathapuzha) is known anciently as the Nila. Option C (Chaliyar) is the fourth-longest river and is not referenced as Churni. Option D (Pampa) is the third-longest river, famously associated with Sabarimala.\n\nRemember:\nPeriyar is often called the lifeline of Kerala due to its massive drinking water and industrial utility.

Correct answer (Option C):\nInternational Day for the Preservation of the Ozone Layer is observed annually on 16th September. This day commemorates the signing of the Montreal Protocol in 1987, which aimed at phasing out substances that deplete the ozone layer. Option C is correct.\n\nWhy others are wrong:\nOption A (12th January) is National Youth Day in India. Option B (8th May) marks World Red Cross Day. Option D (16th October) is celebrated globally as World Food Day.\n\nRemember:\nThe Montreal Protocol is recognized as one of the most successful environmental international treaties in history.

Correct answer (Option A):\nFollowing the turbulent period around India's independence and an assassination attempt that led to the resignation of Sir C.P. Ramaswami Ayyar, P.G.N. Unnithan was appointed as the last Diwan of Travancore on 19 August 1947. Option A is correct.\n\nWhy others are wrong:\nOption B (Venkatta Rao), Option C (Narayana Pillai), and Option D (Sankara Menon) did not step into the role of Diwan immediately following Sir C.P.'s resignation.\n\nRemember:\nP.G.N. Unnithan chaired the administration during the transition until Travancore formally integrated into the Indian Union.

Correct answer (Option C):\nMagma is the extremely hot, molten, and semi-molten rock material located deep beneath the Earth's crust. Once this liquid rock breaks through the surface via volcanic vents, it is reclassified as lava. Option C is correct.\n\nWhy others are wrong:\nOption A (Sial) refers to the upper composition of the earth's continental crust (silicon and aluminium). Option B (Lava) is molten rock on the surface. Option D (Sima) represents the lower crust layer (silicon and magnesium).\n\nRemember:\nMagma cools down beneath the surface to form intrusive igneous rocks like granite.

Correct answer (Option A):\nThe exosphere is the topmost, outermost boundary layer of the Earth's atmosphere. It extends above the thermosphere and gradually fades into the vacuum of interplanetary outer space. Option A is correct.\n\nWhy others are wrong:\nOption B (Mesopause) is the temperature minimum boundary separating the mesosphere and thermosphere. Option C (Mesosphere) lies directly below the thermosphere. Option D (Ionosphere) is an overlapping ionized region located lower than the outer exosphere.\n\nRemember:\nSatellites in low Earth orbit are frequently situated within the upper thermosphere and exosphere layer.