All Free General Knowledge MCQs with Answers

• A. The East Pacific Rise
• B. The Mid-Atlantic Ridge
• C. The Carlsberg Ridge
• D. The Juan de Fuca Ridge

Explanation: The Mid-Atlantic Ridge is the divergent boundary running the length of the Atlantic.

• A. Twelve
• B. Fifteen
• C. Seven (some counts say eight)
• D. Five

Explanation: Geologists usually count seven major plates, sometimes splitting one to make eight.

• A. The Eurasian Plate
• B. The North American Plate
• C. The African Plate
• D. The Pacific Plate

Explanation: The Pacific Plate, mostly ocean floor, is the largest tectonic plate.

• A. The Indian Plate (Indo-Australian Plate)
• B. The Arabian Plate
• C. The African Plate
• D. The Eurasian Plate

Explanation: India rides on the Indian (Indo-Australian) Plate, colliding with Eurasia.

• A. The Eurasian Plate only
• B. The Indian Plate and the Eurasian Plate, with the Arabian Plate near the Makran coast
• C. The Indian Plate only
• D. The African Plate and the Arabian Plate

Explanation: Pakistan straddles the Indian–Eurasian plate boundary, with the Arabian Plate offshore at Makran.

• A. The South American Plate
• B. The Arabian Plate
• C. The Somali Plate
• D. The African Plate

Explanation: Most of Africa sits on the African Plate.

• A. The Antarctic Plate
• B. The Pacific Plate
• C. The Scotia Plate
• D. The Australian Plate

Explanation: Antarctica is carried almost entirely on the Antarctic Plate.

• A. A boundary where two plates move apart
• B. A boundary where one plate melts
• C. A boundary where two plates move together
• D. A boundary where plates slide past each other

Explanation: At divergent boundaries, plates pull apart and new crust forms between them.

• A. A boundary inside a single plate
• B. A boundary where two plates move towards each other
• C. A boundary where two plates move apart
• D. A boundary where plates slide sideways

Explanation: At convergent boundaries plates collide, building mountains or subducting.

• A. A boundary where plates move apart
• B. A boundary where one plate dives under another
• C. A boundary where two plates slide past each other
• D. A boundary where new crust is created

Explanation: Transform boundaries, like the San Andreas Fault, involve plates grinding sideways past each other.

• A. A volcanic island arc
• B. A deep trench
• C. A fold mountain
• D. A rift valley

Explanation: Pulling-apart plates on land create rift valleys.

• A. The East African Rift
• B. The Jordan Rift
• C. The Baikal Rift
• D. The Rhine Graben

Explanation: The East African Rift shows a continent slowly splitting apart.

• A. Mid-ocean ridges
• B. Rift valleys
• C. Fold mountains
• D. Guyots

Explanation: Colliding continental plates crumple into fold mountain ranges.

• A. The Andes
• B. The Alps
• C. The Zagros
• D. The Himalayas

Explanation: India's collision with Eurasia raised the Himalayas, still rising today.

• A. The sinking of one plate beneath another
• B. The sliding of plates past each other
• C. The melting of the crust
• D. The splitting of a plate in two

Explanation: In subduction, a denser plate dives beneath a lighter one into the mantle.

• A. A lighter continental plate
• B. A denser oceanic plate
• C. A younger island arc
• D. A thicker craton

Explanation: Denser oceanic lithosphere sinks beneath buoyant continental plates.

• A. Abyssal plains
• B. Rift valleys
• C. Ocean trenches
• D. Mid-ocean ridges

Explanation: Subduction zones create the ocean's deepest trenches.

• A. The Puerto Rico Trench
• B. The Java Trench
• C. The Tonga Trench
• D. The Mariana Trench

Explanation: The Mariana Trench in the western Pacific is the deepest known ocean trench.

• A. The Pacific Ocean
• B. The Indian Ocean
• C. The Atlantic Ocean
• D. The Southern Ocean

Explanation: The Mariana Trench lies in the western Pacific near Guam.

• A. The Milwaukee Deep
• B. The Diamantina Deep
• C. The Challenger Deep
• D. The Tonga Deep

Explanation: The Challenger Deep is the Mariana Trench's deepest surveyed point.