WAPDA Exam Prep Hub

Why earthquakes happen?

Most earthquakes happen where tectonic plates meet. Earth's outer shell is broken into ~15 major plates that slowly drift, driven by heat from the mantle below.

1. Convergent boundaries
Plates collide. One dives under the other (subduction). This creates the deepest, most powerful quakes — e.g. Japan, Chile, Cascadia.

2. Transform boundaries
Plates grind sideways past each other. Classic example: the San Andreas Fault in California.

3.Divergent boundaries
Plates pull apart, forming rift zones. Earthquakes here are shallower and less destructive — e.g. the Mid-Atlantic Ridge.

Mule is to Pack as Ox is to ________.

1. Horn
2. Hoof
3. Yoke
4. Neck

If you could drill a perfectly straight tunnel from your current location in Islamabad, Pakistan, and go straight through the center of the Earth, which ocean would you most likely emerge into?

​A) The Atlantic Ocean
​B) The Pacific Ocean
​C) The Southern Ocean
​D) The Arctic Ocean

The Diamer-Bhasha Dam is classified as:

A. Earthfill dam
B. Arch dam
C. Roller Compacted Concrete (RCC) dam
D. Buttress dam