Some Natural Phenomena Class 8 Worksheet Science Chapter 12

Multiple Choice Questions (MCQs)
Q1: Which of the following measures the power (magnitude) of an earthquake?
A. Kelvin scale
B. Celsius scale
C. Richter scale
D. Decibel scale

Q2: Which device protects buildings from lightning by providing a direct path for electric charge to flow into the ground?
A. Electroscope
B. Lightning Conductor
C. Transformer
D. Fuse

Q3: When a plastic scale is rubbed on dry hair and then it attracts tiny bits of paper, it demonstrates:
A. Magnetism
B. Static electricity
C. Gravitational force
D. Heat conduction

Q4: What is the primary cause of earthquakes according to modern science?
A. Strong winds
B. Tectonic plate movements
C. Lightning strikes
D. Climate change

Q5: Which of the following is the safest action if you are outdoors during an earthquake?
A. Run into a building quickly
B. Stand under a tall tree
C. Move to a clear, open area away from buildings and power lines
D. Lie flat on the ground immediately

Fill in the Blanks

Q1: The process of transferring excess charge from a charged object to the earth is known as___________.

Q2: The device used to detect the presence of electric charge is called an ___________. 

Q3: When two objects are rubbed together, they become electrically charged due to the transfer of ___________.

Q4: The Earth’s outer layer is divided into fragments called___________, which constantly move and can cause earthquakes.

Q5: When a balloon made of rubber is rubbed with animal fur, the balloon gains extra electrons and becomes ___________charged.

True/False 

Q1: Earthquakes can be accurately predicted by weather departments.

Q2: Objects with the same type of electric charge repel each other, while objects with different types of charges attract each other.

Q3: Lightning can never strike the same place more than once.

Q4: During a thunderstorm, it is safer to be inside a car with the windows rolled up than to be out in the open.

Q5: Rubber that has been rubbed with fur becomes negatively charged, and the fur becomes positively charged.

Very Short Answer Questions

Q1: What type of electric charge is acquired by a rubber balloon when rubbed with a woolen cloth?

Q2: Sometime, a crackling sound is heard while taking off sweater during winters. Explain.

Q3: Explain why a charged balloon is repelled by another charged balloon whereas an uncharged balloon is attracted by another charged balloon?

Q4: What causes lightning in the sky?

Q5: List three states in India where earthquakes are more likely to strike.

Q6: The weather department has predicted that a thunderstorm is likely to occur on a certain day. Suppose you have to go out on that day. Would you carry an umbrella? Explain.

Q7: What will you do to protect yourself from lightning if you are in an open field?

Q8: What precautions would you take to protect yourself during an earthquake if you are at home?

Q9: What are the two kinds of electric charges?

Q10: What happens when plates brush past one another, or a plate goes under another due to collision?

Q11: When a charged refill is touched with the metal top of an electroscope, its aluminium leaves diverge. Give reason.

Q12: What is lightning conductor? How does it work?

Q13: Name the scale on which the destructive energy of an earthquake is measured. An earthquake measures 3 on this scale. Would it be recorded by a seismograph? Is it likely to cause much damage?

Q14: How will you charge a glass rod by the method of friction?

Q15: Why is it not safe to stay under a tree during a thunderstorm?

You can access the solutions to this worksheet here.