1. Which of the following landforms is primarily shaped by erosional work of wind in a desert region?
a) Bajada
b) Alluvial Fan
c) Inselberg
d) Barchan
Answer: d) Barchan
Explanation: A Barchan is a crescent-shaped sand dune formed by the wind's erosional and depositional action. An inselberg (c) is a steep-sided residual hill, but it's formed more by deep weathering and erosion of surrounding rock, not specifically by wind. A bajada (a) and an alluvial fan (b) are depositional landforms created by water in arid environments.
2. The theory of 'Plate Tectonics' explains the formation of which of the following?
a) Ozone Hole
b) Ocean Currents
c) Fold Mountains
d) River Deltas
Answer: c) Fold Mountains
Explanation: The Plate Tectonics theory states that the Earth's lithosphere is divided into plates that are in constant motion. The collision of continental plates causes the crust to crumple and fold, leading to the formation of major fold mountain ranges like the Himalayas and the Alps. The other options are influenced by different processes (atmospheric chemistry, wind and density, fluvial deposition).
3. A 'V'-shaped valley is a characteristic feature of a river's:
a) Lower Course
b) Middle Course
c) Upper Course
d) Deltaic Course
Answer: c) Upper Course
Explanation: In the upper course of a river, vertical erosion (downcutting) is the dominant process. This deepens the river channel rapidly, resulting in a characteristic 'V'-shaped cross-profile. In the middle and lower courses, lateral erosion and deposition become more dominant, forming floodplains and meanders.
4. Which process is responsible for the formation of a 'stack' along a coastline?
a) Salt Crystallization
b) Wave Refraction
c) Longshore Drift
d) Glacial Plucking
Answer: b) Wave Refraction
Explanation: Stacks are formed through coastal erosion. Wave refraction concentrates energy on headlands, eroding them to form caves, then arches. When the arch collapses, it leaves an isolated pillar of rock known as a stack. Longshore drift (c) is a transport process, not an erosional one that creates stacks.
5. Karst topography is a landscape formed primarily by the:
a) Deposition of glacial till
b) Chemical weathering of limestone
c) Wind erosion in deserts
d) Volcanic activity
Answer: b) Chemical weathering of limestone
Explanation: Karst topography is characterized by features like sinkholes, caves, and disappearing streams. It develops in regions with soluble bedrock, most commonly limestone, which is dissolved by slightly acidic water in a process called chemical weathering or carbonation.
Climatology
6. The Coriolis effect is caused by:
a) The gravitational pull of the moon and sun.
b) The revolution of the Earth around the sun.
c) The rotation of the Earth on its axis.
d) The tilt of the Earth's axis.
Answer: c) The rotation of the Earth on its axis.
Explanation: The Coriolis effect is an apparent force that deflects moving objects (like winds and ocean currents) to the right in the Northern Hemisphere and to the left in the Southern Hemisphere. This deflection occurs because different points on the Earth's surface rotate at different speeds; it is a direct consequence of the Earth's rotation.
7. Which climate type is characterized by high temperatures year-round and a distinct wet and dry season?
a) Tropical Rainforest (Af)
b) Tundra (ET)
c) Tropical Monsoon (Am)
d) Tropical Savanna (Aw)
Answer: d) Tropical Savanna (Aw)
Explanation: The Tropical Savanna climate (Aw) has consistently high temperatures but experiences a very pronounced dry season in the low-sun period and a wet season in the high-sun period. The Tropical Rainforest (Af) has precipitation year-round, and the Tropical Monsoon (Am) has a short or no dry season.
8. The term 'albedo' refers to:
a) The heat capacity of a surface.
b) The reflectivity of a surface.
c) The humidity in the atmosphere.
d) The pressure gradient force.
Answer: b) The reflectivity of a surface.
Explanation: Albedo is a measure of how much incoming solar radiation (shortwave energy) is reflected by a surface back into space. Surfaces with high albedo, like ice and snow, reflect most of the energy, while surfaces with low albedo, like the ocean or forests, absorb it.
9. What is the primary source of energy for a hurricane?
a) Geothermal energy from the ocean floor
b) The Coriolis force
c) Latent heat released from condensing water vapor
d) Strong pressure gradients over land
Answer: c) Latent heat released from condensing water vapor
Explanation: Hurricanes are heat engines. Their primary fuel is the latent heat that is released when warm, moist air over the ocean surface rises and the water vapor condenses into clouds and rain. This release of heat warms the surrounding air, causing it to rise further and powering the storm's intense circulation.
10. A temperature inversion often leads to:
a) Clear skies and excellent visibility.
b) Intense thunderstorm development.
c) Trapping of pollutants near the surface.
d) Strong vertical mixing of the atmosphere.
Answer: c) Trapping of pollutants near the surface.
Explanation: A temperature inversion occurs when a layer of warm air sits on top of cooler air near the surface. Since the cool, dense air cannot rise through the warm, light cap, vertical mixing is suppressed. This traps pollutants, dust, and smog close to the ground, leading to poor air quality.
Oceanography
11. The daily rise and fall of ocean water level is called:
a) Ocean Current
b) Tide
c) Wave
d) Tsunami
Answer: b) Tide
Explanation: Tides are the periodic, predictable rise and fall of sea level caused primarily by the gravitational pull of the moon and the sun. Waves are generated by wind, and ocean currents are the continuous, directed movement of seawater.
12. The deep, slow-moving global circulation of ocean water driven by differences in temperature and salinity is known as the:
a) Longshore Current
b) Coriolis Effect
c) Gyre
d) Thermohaline Circulation
Answer: d) Thermohaline Circulation
Explanation: Thermohaline circulation, often called the "global conveyor belt," is a deep-ocean circulation driven by density differences due to temperature (thermo-) and salinity (-haline). It is a crucial component of the Earth's climate system, transporting heat and nutrients around the globe.
13. The 'El Niño-Southern Oscillation (ENSO)' is primarily associated with abnormal sea surface temperatures in which ocean?
a) Atlantic Ocean
b) Indian Ocean
c) Pacific Ocean
d) Arctic Ocean
Answer: c) Pacific Ocean
Explanation: El Niño is characterized by the warming of sea surface temperatures in the central and eastern tropical Pacific Ocean. La Niña is its cold phase. Together, they form the ENSO cycle, which has major impacts on global weather patterns.