1. Who proposed the Plate Tectonic Theory?
a) Alfred Wegener
b) Arthur Holmes
c) McKenzie & Parker
d) Harry Hess
Answer: (c) McKenzie & Parker
Modern Plate Tectonic Theory was formally proposed by Dan McKenzie and Robert Parker in 1967.
2. The lithosphere is divided into approximately how many major plates?
a) 5
b) 7
c) 10
d) 15
Answer: b) 7
NCERT recognizes 7 major plates and numerous minor plates.
Seven major plates are the Pacific Plate, North American Plate, South American Plate, Eurasian Plate, African Plate, Indo-Australian Plate, and Antarctic Plate.
3. Tectonic plates float on which layer of the Earth?
a) Sima
b) Mantle
c) Asthenosphere
d) Sial
Answer: (c) Asthenosphere
Tectonic plates float and move over the partially molten asthenosphere.
4. Which plate boundary is responsible for the formation of the Himalayas?
a) Divergent boundary
b) Transform boundary
c) Convergent boundary
d) Constructive boundary
Answer: (c) Convergent boundary
Nearly all fold mountains like the Himalayas, Andes, Rockies, Alps, etc are formed at the convergent boundary. Himalayas formed due to the collision of the Indian Plate and Eurasian Plate.
5. The Mid-Atlantic Ridge is an example of:
a) Convergent boundary
b) Divergent boundary
c) Transform boundary
d) Subduction zone
Answer: (b) Divergent boundary
New oceanic crust is created as plates move apart.
A divergent boundary is also known as a constructive boundary.
6. Which theory provided the mechanism for continental drift?
a) Geosynclinal Theory
b) Convection Current Theory
c) Nebular Hypothesis
d) Tidal Theory
Answer: (b) Convection Current Theory
Arthur Holmes (1929) proposed mantle convection currents as the driving force.
7. The San Andreas Fault of California is an example of:
a) Divergent boundary
b) Transform boundary
c) Convergent boundary
d) Rift valley
Answer: (b) Transform boundary
Pacific Plate and North American Plate slide past each other.
8. The Ring of Fire is associated with:
a) Atlantic Ocean
b) Arctic Ocean
c) Pacific Ocean
d) Indian Ocean
Answer: (c) Pacific Ocean
About 75% of the world's active volcanoes occur around the Pacific Ring of Fire.
9. Which plate carries the Indian subcontinent?
a) Eurasian Plate
b) Indo-Australian Plate
c) Indian Plate
d) African Plate
Answer: (b) Indo-Australian Plate
10. Ocean trenches are generally formed at:
a) Divergent margins
b) Transform margins
c) Convergent margins
d) Rift valleys
Answer: (c) Convergent margins
One plate subducts beneath another, creating deep trenches.
Mariana Trench is the deepest ocean trench in the world; it is in the Pacific Ocean.
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