Natural Forces Q & A

NATURAL FORCES

L- 16

Q.1. Name the following:

1. Other name of indirect charging method.

2. The process of transferring of charge from a charged body to the earth.

3. SI unit of electric charge.

4. The mutual push between the two bodies (not in contact with one another) away from one another.

5. The branch of science which deals with the study of earthquakes.

6. A body which does not have electric charge.

7. The device which works on transfer of charges.

8. A metallic conductor fixed on tall buildings, such that it conducts the atmospheric electricity into the earth.

9. The place and intensity of earthquake where recently it had occurred (2015).

10. Ordering or placing of different materials having affinity for electrons in a series.

Q.2 .Fill in the blanks: 

1.  An ebonite rod acquires a ………………charge when rubbed with a cat’s skin.

2. Opposite charges …………… each other.

3………………..measures and records the intensity of seismic waves.

4. The point on surface of earth where a seismic wave originates is called……..

5. Lightning …………..protects high buildings from the damage caused by lightning.

6. ……………………….is the innermost layer of earth.

7. ……………is the device used in detecting electric charges.

8. Lightning helps in ………..cycle occurring in nature.

9. Glass rod acquires……………charge when rubbed with silk cloth.

10. ………………is the method in which charging is done with touching the charged body to the object that has to be charged.

Q.3. Give reasons:

1. One should not take shelter under a tall tree during lightning.

2. Why lightning conductors are used?

3. Why lightning is often accompanied by thunder?

4. Why do we often feel electric shock on opening the door of our car / house or when we take off our sweaters at night.

5. Why is it dangerous to carry an umbrella during a thunderstorm?

6. Why tall buildings are mostly struck upon by lightning?