411. The Palaeozoic era starts at ____ million years ago and ends at ____ million years ago. A. 500, 100 B. 570, 225 C. 470, 150 D. 470, 225 ✅ The correct answer is option B.
412. The ozone layer at high altitude contains A. atomic oxygen (O) and ordinary oxygen (O2) B. only ozone (O3) C. mixture of atomic oxygen (O), ordinary oxygen (O2) and Ozone (O3) D. only ordinary oxygen (O2) ✅ The correct answer is option C.
413. The process of evaporation of water in nature is one of the basic components of the hydrological cycle. The other process that is considered to be essential for the completion of hydrological cycle is the A. flow tide and ebb tide in a river B. movement of water vapour in the atmosphere C. flow of water in the sea D. movement of water in the water table ✅ The correct answer is option B.
414. The main tributaries of Indus river system are A. the Jhelum, the Chenab , the Ravi B. the Beas, the Sutlej C. both (a) and (b) D. None of the above ✅ The correct answer is option C.
415. The soils whose parent material tend to be rich in sand are A. spodsols B. alfisols C. aridsols D. ultisols ✅ The correct answer is option A.
416. The modern theory of plate tectonics states A. the creation of oceanic crust and the drifting of continents B. the convention currents within the earth’s mantle cause the creation of new oceanic crust at the mid oceanic ridges C. that the oceanic crust is destroyed at areas where this crust type becomes subducted under the lighter continental crust D. All of the above ✅ The correct answer is option D.
417. The middle latitude extends between A. 23(1/2)? North to 32(1/2)? South B. 23(1/2)? and 66? in both the hemispheres C. 66? North to 66? South D. North pole and South pole ✅ The correct answer is option B.
418. The transverse, longitudinal and surface waves in an earthquake originate from A. the epicentre within the body of the earth B. the focus on the surface of the earth C. the focus within the body of the earth D. the epicentre on the body of the earth ✅ The correct answer is option C.
419. The process that creates the deep oceanic trenches is called A. plate tectonics B. sea floor spreading C. continental drift D. isostasy ✅ The correct answer is option A.
420. The term ‘regur’ refers to A. deltaic alluvial soils B. lateral soils C. black cotton soils D. red and yellow soils ✅ The correct answer is option C.