CBSE Class 8 Science Some Natural Phenomena Assignment Set B

CBSE Class 8 Science - Some Natural Phenomena (2)

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Q1. What type of electric charge is acquired by a rubber balloon when rubbed with a

woolen cloth?

Q2. A positively charged object repels another charged object kept close to it. What is

the nature of charge on the other object?

Q3. A glass rod is rubbed with a silk cloth & a rubber balloon is rubbed with a woolen

cloth.

a) Which two objects acquire negative charge?

b) Which two objects acquire positive charge?

Q4. Explain why, a glass rod can be charged by rubbing when held by hand but an

iron rod cannot be charged by rubbing, if held by hand?

Q5. Consider three charged bodies P, Q & R. If P & Q repel each other & P attracts R.

What is the nature of force between Q & R?

Q6. Name the device used to detect electric charge on a body. Draw its labeled

diagram.

Q7. What will you observe when the metal cap of an electroscope is touched with a

glass rod which has been rubbed with silk cloth? Give reason for your answer.

Q8. What are the uses of an electroscope? (3 points)

Q9. Why do the leaves of a gold leaf electroscope diverge when a charged body is

brought in contact with its disc?

Q10. Do the leaves of an electroscope always diverge to the same extent when a

charged body is brought in contact with its disc?

Q11. What will you observe when the metal cap of an electroscope is touched with:

a) A positively charged object?

b) A negatively charged object?

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