Origin and Evolution of Earth - Practice Test 4

Attempt the quiz above first, then review every question with its correct answer and a short explanation below.

1. Q1.The 'Shadow Zone' of an earthquake refers to:

   • A.Area of maximum damage
   • B.Area where no seismic waves are recorded✓ Correct Answer
   • C.Area near the epicenter
   • D.Area of tsunami

   Explanation: The Shadow Zone is where seismographs do not detect P or S waves due to refraction/blocking by the core.

2. Q2.The radius of the core is approximately:

   • A.3500 km✓ Correct Answer
   • B.6371 km
   • C.1000 km
   • D.5000 km

   Explanation: The core has a radius of about 3,500 km.

3. Q3.The density of the core is approximately:

   • A.2.7 g/cm³
   • B.5 g/cm³
   • C.13 g/cm³✓ Correct Answer
   • D.1 g/cm³

   Explanation: The core density is very high, ranging from 9 to 13 g/cm³.

4. Q4.Which era witnessed the 'Ice Ages'?

   • A.Cenozoic (Pleistocene)✓ Correct Answer
   • B.Mesozoic
   • C.Paleozoic
   • D.Precambrian

   Explanation: The Pleistocene epoch of the Cenozoic era is famous for its Ice Ages.

5. Q5.The Gondwanaland separated from Laurasia in which period?

   • A.Triassic-Jurassic✓ Correct Answer
   • B.Cambrian
   • C.Permian
   • D.Quaternary

   Explanation: The breakup occurred during the Mesozoic era (Triassic/Jurassic).

6. Q6.The solid, outermost layer of the Earth is called:

   • A.Crust✓ Correct Answer
   • B.Asthenosphere
   • C.Outer Core
   • D.Mesosphere

   Explanation: The Crust is the thin outer shell.

7. Q7.The thickness of the oceanic crust is ___ compared to continental crust.

   • A.More
   • B.Less✓ Correct Answer
   • C.Equal
   • D.Variable

   Explanation: Oceanic crust (5-10 km) is thinner than Continental crust (30-50 km).

8. Q8.The term 'Pangaea' implies:

   • A.All Earth✓ Correct Answer
   • B.All Water
   • C.All Fire
   • D.All Air

   Explanation: Pangaea means 'All Earth' in Greek.

9. Q9.Which force suggested by Wegener for Continental Drift was proven wrong/insufficient?

   • A.Tidal Force and Pole Fleeing Force✓ Correct Answer
   • B.Convection currents
   • C.Slab pull
   • D.Ridge push

   Explanation: Wegener suggested Tidal force and Pole Fleeing force, which physicists calculated were too weak.

10. Q10.The theory of Plate Tectonics explains:

    • A.Mountain building
    • B.Earthquakes
    • C.Volcanism
    • D.All of the above✓ Correct Answer

    Explanation: Plate Tectonics explains major geological features and events.

11. Q11.Transform boundaries are characterized by:

    • A.Creation of crust
    • B.Destruction of crust
    • C.Sliding past each other✓ Correct Answer
    • D.Volcanic eruptions

    Explanation: At transform boundaries, plates slide horizontally past each other (e.g., San Andreas Fault).

12. Q12.The Himalayas are rising due to the collision of:

    • A.Indian Plate and Eurasian Plate✓ Correct Answer
    • B.Nazca and South American
    • C.Pacific and Asian
    • D.African and European

    Explanation: The continued collision of the Indian and Eurasian plates raises the Himalayas.

13. Q13.The Deccan Traps in India were formed by:

    • A.Volcanic eruption (flood basalt)✓ Correct Answer
    • B.Sedimentation
    • C.Metamorphism
    • D.Glaciation

    Explanation: Massive volcanic eruptions (flood basalts) around 66 million years ago formed the Deccan Traps.

14. Q14.The layer of the atmosphere that protects Earth from UV rays formed from:

    • A.Ozone (Oxygen)✓ Correct Answer
    • B.Nitrogen
    • C.Hydrogen
    • D.Helium

    Explanation: Ozone (O3) is formed from Oxygen, which accumulated due to photosynthesis.

15. Q15.The 'Goldilocks Zone' condition of Earth means:

    • A.Too hot
    • B.Too cold
    • C.Just right for liquid water✓ Correct Answer
    • D.Gas giant status

    Explanation: It refers to the habitable zone where temperature allows liquid water.

16. Q16.Which gas was rare in the primordial atmosphere but abundant now?

    • A.Oxygen✓ Correct Answer
    • B.Methane
    • C.Ammonia
    • D.Hydrogen

    Explanation: Free Oxygen was rare until life evolved.

17. Q17.Aravalli Range is an example of:

    • A.Old Fold Mountains✓ Correct Answer
    • B.Young Fold Mountains
    • C.Block Mountains
    • D.Volcanic Mountains

    Explanation: Aravallis are one of the oldest fold mountains in the world (Precambrian).

18. Q18.The superocean surrounding Pangaea was called:

    • A.Panthalassa✓ Correct Answer
    • B.Tethys
    • C.Iapetus
    • D.Atlantis

    Explanation: Panthalassa was the global ocean surrounding the supercontinent Pangaea.

19. Q19.Which evidence supports Continental Drift?

    • A.Jig-saw fit of continents
    • B.Fossil correlation across oceans
    • C.Paleoclimatic evidence
    • D.All of the above✓ Correct Answer

    Explanation: Wegener used all these evidences to support his theory.

20. Q20.Magnetic striping on the ocean floor is evidence of:

    • A.Sea Floor Spreading✓ Correct Answer
    • B.Continental Drift only
    • C.Earth's rotation
    • D.Polar wandering

    Explanation: Paleomagnetism (magnetic striping) provided strong proof for Sea Floor Spreading.