Sunday 18 October 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.

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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