Question

ASSIGNMENT
L-11 : ELECTRIC CHARGES AT REST
Q1. Name the English Physicist who discovered that diamond and sapphire can also be charged.
Q2. What is the Greek name of amber?
Q3. What happens when a glass rod is rubbed against silk?
Q4. ________ suggested the idea of lightning conductor.
Q5. ________ objects are insulators and can be charged.
Q6. When is an object said to be electrically charged?
Q7. Putting a charged object in contact with earth is called-
a) Bonding b) Earthing c) Freezing d) Connecting
Q8 A simple device, to detect charge on a body is called-
a) Endoscope b) Periscope c) Electroscope d) Gyroscope
Q9. Read the following options clearly and tick the correct option for the questions that follow-
Both A and R are True but R is the correct explanation of A.
Both A and R True but R is not the correct explanation of A.
A is True but R is False.
A is False but R is True.
Both A and R are False.


Assertion (A) : A lightning conductor is a device that converts nitrogen into its oxide.
Reason (R) : Lighting conductor was discovered by Sir Isaac Newton.
II) Assertion (A) : Conductors are materials that allow an electric charge to flow through them.
Reason (R) : All metallic materials are conductors.

Q10. Distinguish between conductors and insulators. Give one example for each.
Q11. Give reason as to what happens when-
a) a dry plastic comb is rubbed through dry hair.
b) a dry metal comb is rubbed through dry hair.
c) a charged ebonite rod is brought close to suspended glass rod.
Q12. a) What do you mean by ‘Earthing’?
b) Write any 2 useful practical applications of earthing in our daily life.
Q13.. a) Define electrical induction.
b) Charges are always produced in pairs. Explain in brief.
Q14. a) What is lightning?
b) List any 2 advantages of lightning.
Q15. Explain the phenomena of electric discharge.


Q16. What is a lightning conductor? Draw a diagram to explain the working of a lightning conductor.
Q17. List any 3 precautions that should be taken to protect oneself from lightning in the open.
Q18. a) The force exerted by a charged object on another charged object is a force of __________ and __________.
b) Explain the following methods of charging by-
i) Rubbing/Friction ii) Conduction
Q19. State the sign of the charge acquired by an object when it is charged, by a negatively charged rod through
Conduction b) Induction
Give reason to support your answer.

Q20. a) Explain how does lightning and thundering phenomenon occur in the nature.
Write any 2 advantages of lightning.
Q21. Write down various steps involved in charging a sphere negatively by the process of induction along with diagram.
Q22. a) Which method of charging object is depicted in the given picture?

Explain this method of charging.
Enlist the other two methods of charging.
Q23. Describe one activity each to show that-
A non-metallic object gets electrically charged when rubbed properly.
A metallic object does not get electrically charged when rubbed vigorously.
Q24. a) Draw diagram to show the structure of a lightning conductor.
b) Explain the two ways in which a lightning conductor helps to protect any structure.
c) Lightning is useful to plants. Give reason.
WORKSHEET

Q1. When is an object said to be electrically charged?
______________________________________________________
Q2. “Conductors do not allow an electric charge to flow through them whereas insulators allow charges to flow through them. What is the net result when conductors and insulators are rubbed against another material?”
Q3. List the 2 types of forces exerted by a charged object on another charged object.
Q4. Define Earthing. Give one useful application of Earthing in our daily life.
Q5. How do objects get charged by following methods-
Friction- ____________________________________________
Conduction- _________________________________________
Q6. Define electrical induction.
______________________________________________________
Q7. What is a lightning conductor?
______________________________________________________
Q8. Enlist any 3 safety precautions to be taken during lightning when a person is present indoors.
______________________________________________________
Q9. List 2 advantages of lightning.
______________________________________________________
Q10. Write the steps of charging by induction.
______________________________________________________​

Answer 1

Answer:

Bonding b) Earthing

Explanation:

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