7. A glass rod is rubbed with a silk cloth. What type of charge is acquired by (a) silk cloth, (b) glass rod?
8. An inflated rubber balloon and a woollen cloth are rubbed together. What type of charge is acquired by
(a) woollen cloth, and (b) rubber balloon ?
9. Name the device to detect electric charge on a body.
10. When an object is touched with the metal top of an electroscope, its aluminium leaves diverge. What
conclusion do you get from this observation ?
11. What name is given to the flash of light which occurs in the sky during the rainy season?
12. Why should a person not stand under a tree during a thunderstorm?
13. Name the scientist who showed that lightning is electric in nature.
14. Name the device which is used to protect a tall building from lightning,
short time?
15. What name is given to the phenomenon in which the earth shakes suddenly for a very
16. Name one destructive natural phenomenon which cannot be predicted in advance.
17. List three states in India where earthquakes are more likely to occur.
18. Name the instrument used to measure and record an earthquake.
ashmir earthquakes on the Richter Scale ?
Answers
Explanation:
after see say thankful
Answer:
7) A glass rod becomes positively charged when rubbed with silk, while the silk becomes negatively charged.
8) (a) woollen cloth, and (b) rubber balloon? Answer: The rubber balloon becomes negatively charged when rubbed with a woolen cloth. The woolen cloth acquires a positive charge.
9) Electroscope is the device which is used to detect charge on a body. It is used for detecting, measuring and finding the nature of a charge.
10) When an object is touched with the metal top of an electroscope, its aluminium leaves diverge. What conclusion do you get from this observation? Answer : If the leaves of the electroscope diverge or open up when an object is touched, the body is charged.
11) What name is given to the flash of light which occurs in the sky during the rainy season? Solution: Lightening is the name given to the flashlight which occurs in the sky during the rainy season.
12) A person should not stand under a tree during thunderstorm because lightening first strikes high places and trees are usually high. So if lightening strikes a tree and you are under that tree, you are likely to get an electric shock.
13) On June 10, 1752, Benjamin Franklin flies a kite during a thunderstorm and collects ambient electrical charge in a Leyden jar, enabling him to demonstrate the connection between lightning and electricity.
14) A lightning rod (US, AUS) or lightning conductor (UK) is a metal rod mounted on a structure and intended to protect the structure from a lightning strike.
15) Earthquake is the phenomenon in which the earth shakes suddenly for a very short time.
16) Earthquake is the destructive natural phenomenon which cannot be predicted in advance. The earthquakes can cause floods, landslides and tsunamis.
17) According to that the most earthquake prone areas in India are Jammu and Kashmir, Gujarat and Assam. These are the three states where earthquakes are more likely to strike.
18) Seismograph/Seismometer
The difference in position between the shaking part of the seismograph and the motionless part is what is recorded.
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