SEBA Class 8 Science Important Chapter 15 Some Natural Phenomena

SEBA Class 8 Science Important Chapter 15 Some Natural Phenomena Solutions English Medium As Per SEBA New Syllabus to each chapter is provided in the list so that you can easily browse through different chapters SEBA Class 8 General Science Additional Solutions and select need one. SCERT Important Solutions For Class 8 General Science Download PDF. Important Notes for Class 8 Science SCERT.

SEBA Class 8 Science Important Chapter 15 Some Natural Phenomena

Also, you can read the NCERT book online in these sections Solutions by Expert Teachers as per Central Board of Secondary Education (CBSE) Book guidelines. Assam SEBA Board Class 8 Science Additional Question Answer are part of All Subject Solutions. Here we have given SCERT Class 8 General Science Important Notes for All Chapters, You can practice these here.

Some Natural Phenomena

Chapter: 15

PART – II

IMPORTANT QUESTION ANSWER

A. Very Short Type Question & Answer:

1. What is lightning?

Ans. Lightning is a natural electric spark caused by the accumulation and discharge of electric charges in clouds.

2. Who proved that lightning and electric sparks are similar?

Ans. Benjamin Franklin proved in 1752 that lightning and electric sparks are the same phenomenon.

3. What are charged objects?

Ans. Objects that acquire electric charge by rubbing are called charged objects.

4. What happens when like charges come close to each other?

Ans. Like charges repel each other.

5. What happens when unlike charges come close?

Ans. Unlike charges attract each other.

6. What is an electroscope?

Ans. An electroscope is a device used to detect whether an object is electrically charged or not.

7. What is earthing?

Ans. Earthing is the process of transferring electric charge from an object to the earth.

8. What is the Richter scale used for?

Ans. The Richter scale is used to measure the magnitude of an earthquake.

9. What is a seismograph?

Ans. A seismograph is an instrument used to detect and record seismic waves during an earthquake.

10. What materials are safer for building houses in earthquake-prone areas?

Ans. Mud and timber are safer than heavy materials in earthquake-prone areas.

B. Fill in the Blanks:

1. Lightning is a natural electric __________.

Ans. Discharge.

2. The transfer of charge from an object to the earth is called __________.

Ans. Earthing.

3. Earthquakes are measured on the __________ scale.

Ans. Richter.

4. A device used to detect seismic waves is called a __________.

Ans. Seismograph.

5. The outermost layer of the Earth is called the __________.

Ans. Crust.

C. True or False:

1. Earthquakes are caused due to the movement of tectonic plates.

Ans. True.

2. Lightning always strikes tall buildings only.

Ans. False.

3. Earthing is the process of transferring charge to the ground.

Ans. True.

4. Lightning rods can prevent earthquakes.

Ans. False.

5. Seismograph is used to measure the strength of an earthquake.

Ans. True.