Class 8 Science Some Natural Phenomena Worksheet -1

Class 8 Science Some Natural Phenomena Worksheet -1

 

Section A: Fill in the Blanks

1. ________ is caused by the accumulation of charges in clouds. 
2. During a thunderstorm, it is safe to take shelter in a ________. 
3. ________ is the process of electrical discharge between clouds or between clouds and the earth. 
4. Earthquakes can cause secondary disasters such as ________ and tsunamis. 
5. The ________ is the point inside the earth where an earthquake originates. 
6. When two charged balloons are brought close, they ________ each other. 
7. The process of separating positive and negative charges in clouds leads to ________. 
8. During earthquakes, ________ shelves to the walls to prevent them from falling. 
9. A sudden movement of earth’s plates is responsible for ________. 
10. ________ is the layer beneath the earth’s crust.

 

Section B: Multiple Choice Questions

 

1. What causes earthquakes?

    (a)  Disturbances deep inside the earth’s crust

    (b)  The shifting of the earth on a bull’s horn

    (c)  Changes in weather patterns

    (d)  Underwater volcanic activity only

 

2. What are the fragments of the earth’s outermost layer called?

    (a)  Continents

    (b)  Plates

    (c)  Faults

    (d)  Seismic zones

 

3. What scale measures the destructive energy of an earthquake?

    (a)  Celsius scale

    (b)  Richter scale

    (c)  Fahrenheit scale

    (d)  Kelvin scale

 

4. Can earthquakes be accurately predicted?

    (a)  Yes

    (b)  No

    (c)  Sometimes

    (d)  Only by experienced seismologists

 

5. What is a seismograph used for?

    (a)  Measuring temperature

    (b)  Recording seismic waves

    (c)  Predicting earthquakes

    (d)  Creating artificial earthquakes

 

6. What is a safe place to be during a thunderstorm?

    (a)  Under a tall tree

    (b)  In an open field

    (c)  Inside a house or car

    (d)  On a hilltop

 

7. What should you avoid touching during a thunderstorm?

    (a)  Wooden objects

    (b)  Plastic objects

    (c)  Metal objects and water

    (d)  Glass objects

 

8. What is the recommended position to adopt if caught in an open field during a lightning storm?

    (a)  Lying flat on the ground

    (b)  Standing tall

    (c)  Squatting low with head between knees

    (d)  Running for shelter

 

9. Which material is better for construction in highly seismic areas?

    (a)  Heavy concrete

    (b)  Steel

    (c)  Mud or timber

    (d)  Glass

 

10. What should you do if you are indoors when an earthquake strikes?

    (a)  Run outside immediately

    (b)  Take shelter under a sturdy table

    (c)  Stand near a window

    (d)  Climb a tall object

 

Section C: True or False

 

1. An electroscope detects whether a body is charged. 
2. Tsunamis are caused by hurricanes. 
3. The outer core of the earth is solid. 
4. Richter scale measures wind speed. 
5. The process of charging by rubbing generates static electricity. 

 

Section D: Short Answer Questions

 

1. What is the Richter scale used for? 
2. Name three seismic zones in India. 
3. Explain why an electroscope is used. 
4. What happens during electric discharge in clouds? 
5. Mention two causes of earthquakes.

 

Section E: Long Answer Questions

 

1. What are the effects of earthquakes on human life and property? 
2. How is a seismograph used to measure earthquakes? 
3. Discuss the causes and effects of tsunamis. 
4. Write a detailed note on the transfer of charge by rubbing. 
5. What precautions should be taken while constructing buildings in seismic zones?