Q. With reference to “Earthquakes” consider the following statements:
1.An earthquake is caused by tremors due to the movement of the tectonic plates of the earth.
2.An earthquake originates from focus.
3.The point on the Earth’s surface directly above the focus is the hypocentre.
4.When energy is released at the focus, seismic waves travel outward from that point in all directions. 
Which of the statements given above are correct?

[A] 1, 2 and 3 only

[B] 1, 2 and 4 only

[C] 2, 3 and 4 only

[D] 1 and 4 only

Answer: B
Notes:

Statement 1, 2 and 4 are correct. An earthquake is caused by tremors due to the movement of the tectonic plates of the earth. An earthquake originates from focus. When energy is released at the focus, seismic waves travel outward from that point in all directions.

Statement 3 is incorrect. The point on the Earth’s surface directly above the focus is the epicentre.

Source: DNA