Important Questions
Question 1. A volcanic eruption is most likely to be violent when _____
Answer: The lava is viscous.
Question 2. If the lava is of ‘acidic’ in nature, the eruption will be of _____
Answer: Explosive type.
Question 3. The ‘Hawaiian type volcano are characterised by _____
Answer: Silent effusion of lava without any explosive activity.
Question 4. The most violent type of all the eruptions is _____
Answer: Pelean type
Question 5. The most important constituent of volcanic gases, which contributes nearly 90% of the total content of volcanic gases, is _____
Answer: Steam
Question 6. The ‘Light House of the Mediterranean’ is _____
Answer: Stromboli volcano.
Question 7. Visuvious is an example of _____
Answer: Dormant volcano.
Question 8. ‘The Valley of Ten Thousand Smokes’ is _____
Answer: Katmai valley.
Question 9. Who propounded The Elastic Rebound Hypothesis of Earthquake?
Answer: H.F. Reid.
Question 10. At the time of earthquake, the shaking is the strongest near the _____
Answer: epicentre.
Question 11. The place of origin of an earthquake inside the earth is called, its _____
Answer: focus.
Question 12. ‘Isodiastrophic’ is _____
Answer: line of equal damage.
Question 13. Observations have shown that most of the earthquakes originate at a depth _____
Answer: from 50 to 100 km.
Question 14. Several interconnected mountains constitute a _____
Answer: range.
Question 15. A well will always contain water if _____
Answer: the bottom of the well is far below the water table.
Question 16. The formation of a river delta involves the processes of _____
Answer: deposition, corrosion and transport.
Question 17. The erosive power of a river depends most upon its _____
Answer: speed and volume.
Question 18. Deposition by a river increases when _____
Answer: the volume of water in the river increases.
Question 19. The load of river comes mainly from _____
Answer: the bluffs which are undercut by the river in its upper course.
Question 20. Most rivers flow slowly near the sea level and in consequence their main action is depositional. A river in this stage would not show signs of _____
Answer: deposits of large boulders.
Question 21. A drainage system which is no way related to the structure of the region where it occurs is called _____
Answer: superimposed drainage pattern.
Question 22. The features, which may suggest that a drainage system has been rejuvenated, are _____
Answer: knick points, paired river terraces and incised meanders.
Question 23. “The wearing away of the sides and bottom of a river’s channel by the load carried by a river” is called _____
Answer: corrosion.
Question 24. Chemical weathering takes place most effectively when it is _____
Answer: hot and wet.
Question 25. The ‘Geanticlines’ mean _____
Answer: the warped up sedimentary area during crustal bending.
Question 26. When compression takes place on the crust due to endogenetic forces a part of the crust is raised up and is known as _____
Answer: folds.
Question 27. In the folds, when one limb lines over the other in a horizontal position it is known as _____
Answer: recumbent fold.
Question 28. A ‘Fanfold’ is _____
Answer: a great anticline which has many small anticlines and synclines.
Question 29. A broken and separated limb of a recumbent fold when found away from its place is known as _____
Answer: Nappe.
Question 30. ‘Gouge’ is _____
Answer: a kind of rock-waste, produced by the movement of blocks.
Question 31. In a fault, the block that moves up is called _____
Answer: Hanging wall.
Question 32. Which pair is wrong?
(i) Hanging wall—the block that moves up (upthrust side).
(ii) Food wall—the block that moves down (down-throw side)
(iii) Escarpment—when a block slips down along the fault plane.
Answer: None.
Question 33. The land form produced by faults are _____
Answer: Grabben, Horst, Drag.
Question 34. Example of exogenetic forces are _____
Answer: Rivers, Animals, under -ground water.
Question 35. Rift valleys are caused by _____
Answer: endogenetic forces.
Question 36. The forces which start to destroy the uneveness on the law surface are known as _____
Answer: exogenetic forces.
Question 37. ‘Step fault’ is a situation in which _____
Answer: the crust is broken into several parallel faults and looks like a flight to stairs.
Question 38. ‘Traction’ is a process in which _____
Answer: transportation of debris by river through creeping and rolling takes place.
Question 39. Physical weathering becomes important in _____
Answer: arid climates.
Question 40. ‘Freeze-thaw’ is an example of _____
Answer: physical weathering.
Question 41. ‘Tor’ is _____
Answer: weathered blocks of rocks in round-edged shape.
Question 42. Which rocks are formed under high pressure and high temperature?
Answer: metamorphic.
Question 43. ‘Geographical cycle’ means _____
Answer: the evolution of landscape in a cycle in which the various stages of development pass through in a definite order.
Question 44. “Any landform is a function of its structure, process and time”, propounded by _____
Answer: Penck.
Question 45. Who divided the evolution of landforms in three stages viz. youth, maturity and old stage?
Answer: Davis.
Question 46. What makes the water flow from higher to lower levels?
Answer: gravity.
Question 47. ‘Valley deepening’ does not depend on _____
Answer: solution action.
Question 48. ‘Rock Benches’ are associated with _____
Answer: cross profile of a river.
Question 49. ‘Beheaded stream’ is a special case of _____
Answer: obsequent valleys.
Question 50. A valley which is neither determined by the structure of the land nor the nature of the slope, is called _____
Answer: insequent valley.