The diagram shows the focus of an earthquake. Focus is the point inside the Earth’s crust where the earthquake originates. 1, 2, 3 and 4 are four locations on the Earth’s surface.
In which location will the effect of the earthquake be maximum?
Important Questions on Some Natural Phenomena
| Richter scale measurement of the earthquake | Example of damages due to the earthquake |
| 3.0 - 3.9 | No damages but some vibrations felt |
| 4.0 - 4.9 | Cracks in windows, some unstable objects fall |
| 5.0 - 5.9 | Building walls may collapse, movement of furniture |
| 6.0 - 6.9 | Building roofs may collapse, loss of few lives |
| 7.0 - 7.9 | Cracks on ground, underground pipes broken, loss of many lives |
The damages from an earthquake are listed below.
- 2 people died
- 5 building roofs collapsed
- 12 building walls collapsed
What could be the likely reading on the Richter scale for the earthquake?
In the following diagram, amber and fur are rubbed together resulting in a negatively charged amber and positively charged fur.
During the process of charging the fur,
The figure shows a person holding a polythene strip after it has been rubbed with a duster cloth. The strip acquires a negative charge. Yet, after a few seconds, the duster cloth does not show any charge. Which of the following could be the reason for this?
