Saturday, October 17, 2015

CBSE Class 8 - Science - CH 15 - Some Natural Phenomena (Worksheet)

Some Natural Phenomena

CBSE Class 8 - Science - CH 15 - Some Natural Phenomena (Worksheet)
Tsunami hits at San Jose: picture by Angela Riddock

Worksheet based on Class 8 NCERT Chapter 15


Fill in the blanks with appropriate words given below:

seismograph, Ritcher scale, static, earthquake, positive, earthing, thunder, Like charges, seismic waves, unlike charges, electroscope



1. _______ electricity consists of electric charges which do not flow.


2. A glass rod when rubbed with a piece of silk cloth gets charged with ________ charge.


3. Seismic waves are recorded by an instrument called ____________.


4. An explosive sound heard during lightning is termed as _________.


5. _____ _______ repel each other while ______ _______ attract each other.




6. The scale used to express the power of an earthquake is called __________.


7. The process of transfer of charges from a charged object to the earth ground is known as ________.


8. The waves produced by tremors on the surface of the earth. such waves are called __________.


9. A device that can be used to test whether an object is carrying charge or not, the device is called ___________.


10. An _______ is a sudden shaking or trembling of the earth.




Answer:
1. Static
2. positive
3. seismograph
4. thunder
5. Like charges, unlike charges
6. Ritcher scale
7. earthing
8. seismic waves
9. electroscope
10. earthquake

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