Page 3 - Competency Based Worksheet-Some Natural Phenomena

ACTIVITY-BASED QUESTIONS
12. Rub a balloon on your hair and bring it near small paper bits.
a) What happens to the bits? Why?
b) What type of charge likely forms on the balloon?

13. Two balloons are rubbed with wool and suspended.
a) What happens when they are brought close?
b) What type of force is acting?
c) What does it show about similar charges?

DATA-BASED QUESTIONS
14. Table 1: Earthquake Causes and Effects

Richter Epicenter Mercalli
Year Country Reason
Scale (km) Scale
Collision between tectonic
1923 Japan 7.9 205 X
plates
Collision of Indian & Eurasian
1920 China 7.3 67 X
plates
West Collision between tectonic
1976 4.4 587 V
Bengal plates
Collision between tectonic
1984 Odisha 2.8 167 II
plates
Volcanic eruption (magma
1985 Nepal 5.4 342 VI
movement)

a) Mostly earthquakes happen due to _______________.
b) If the intensity is 7.5 on the Richter scale, estimate Mercalli scale value:
c) What was the cause of the 1985 Nepal earthquake?
d) Differentiate between Richter and Mercalli scales:
15. Table 2: Global Earthquakes

Depth
Earthquake Location Magnitude Casualties Year Notes
(km)
Triggered tsunami, nuclear
A Japan 9.0 29 15,894 2011
crisis
B Nepal 7.8 15 8,964 2015 Destruction in Kathmandu
C Indonesia 6.1 10 273 2021 Moderate damage
Turkey- Widespread structural
D 7.8 17.9 50,000+ 2023
Syria collapse
One of the deadliest in
E Haiti 7.0 13 230,000 2010
history
a) Which location experienced the strongest earthquake?
b) Why did Nepal and Turkey-Syria differ in casualties despite same magnitude?
c) What disaster did Japan’s earthquake trigger besides ground shaking?
d) What conclusion can be drawn about magnitude vs. casualties?