CBSE Class 8 Science Electricity and Lightning Assignment Set A

I Fill in the blanks:-

1. A property of matter, called ---------------- gives rise to electricity.

2. Particles that carry negative charge is called ___________ .

II. Choose the correct options:-

1 A nonmetal which is not an insulator

a) Carbon b) Sulphur c) Oxygen d) None

2. Which property is used while testing for charge:-

a) Attraction

b) Repulsion

c) Attraction as well as repulsion

d) Neither attraction nor repulsion

III Name the following :-

1 The flow of charge through air or gas.

2 Charging objects by bringing them near a charged body .

3 Rubbing body against each other to acquire an equal and opposite charge.

IV Define the following:-

1 Earthing. 2. Conduction 3.Electrostatic Force

V. Draw neat and labelled diagram.

1. Lightning strike and conductor.

2. Charging by induction and charging by conduction.

VI Give Reasons

1. A piece of Styrofoam gets charged when it is rubbed with a piece of paper.

2. The leaves of gold leaf electroscope diverge when a charged body is brought in contact with its disc.

VII Answer in 20 words:-

1 What happens when someone rubs glass rod with a piece of silk and is brought near a negatively charged paper cylinder.

2 What would you expect when a plastic ruler is rubbed with a woollen cloth.

VIII Answer in 40 words:-

1 When a charged rod is moved towards an uncharged paper cylinder suspended by a string, the cylinder gets attracted to the rod initially and then moves away with a jerk .Explain why?

2 What are Lightning Conductors?

IX Answer in 100 words:-

1 How does lightning occur?

2 How would you use an electroscope to determine the nature of the charge (positive or negative) on a body?

X Label the following parts and answer the following questions:-

1 What is the use of Gold Leaf Electroscope?

2 Can any other metal be used in place of gold? If yes, Name any two metals.