Some Natural Phenomena MCQs Class 8
CBSE Class 8 Science – Some Natural Phenomena MCQs
Class: 8
Subject: Science
Section: Some Natural Phenomena
Topic: Some Natural Phenomena MCQs
Board: CBSE (Based on NCERT Syllabus)
Subject: Science
Section: Some Natural Phenomena
Topic: Some Natural Phenomena MCQs
Board: CBSE (Based on NCERT Syllabus)
1. What is lightning?
Answer: b) Electric discharge in atmosphere
Explanation: Lightning is a sudden electric discharge between clouds or between cloud and Earth. It occurs due to accumulation of electric charges in clouds.
Explanation: Lightning is a sudden electric discharge between clouds or between cloud and Earth. It occurs due to accumulation of electric charges in clouds.
2. Which device is used to detect electric charge?
Answer: a) Electroscope
Explanation: An electroscope is used to detect the presence and type of electric charge by the divergence of its metal leaves.
Explanation: An electroscope is used to detect the presence and type of electric charge by the divergence of its metal leaves.
3. Lightning conductor is made of:
Answer: c) Metal
Explanation: Metals are good conductors of electricity. Lightning conductors provide a safe path for electric discharge to the ground.
Explanation: Metals are good conductors of electricity. Lightning conductors provide a safe path for electric discharge to the ground.
4. Earthquakes are caused by:
Answer: a) Movement of tectonic plates
Explanation: Sudden movement of Earth’s crustal plates releases energy, producing seismic waves that cause earthquakes.
Explanation: Sudden movement of Earth’s crustal plates releases energy, producing seismic waves that cause earthquakes.
5. The instrument used to measure earthquakes is:
Answer: a) Seismograph
Explanation: A seismograph records seismic waves and helps determine the magnitude and intensity of earthquakes.
Explanation: A seismograph records seismic waves and helps determine the magnitude and intensity of earthquakes.
6. The scale used to measure earthquake magnitude is:
Answer: b) Richter scale
Explanation: The Richter scale measures the energy released during an earthquake.
Explanation: The Richter scale measures the energy released during an earthquake.
7. The point inside Earth where earthquake starts is called:
Answer: b) Focus
Explanation: The focus is the origin point of seismic waves inside the Earth. The epicentre lies directly above it on the surface.
Explanation: The focus is the origin point of seismic waves inside the Earth. The epicentre lies directly above it on the surface.
8. Which cloud is mainly associated with lightning?
Answer: a) Cumulonimbus
Explanation: These tall thunderclouds develop large charge differences leading to lightning.
Explanation: These tall thunderclouds develop large charge differences leading to lightning.
9. Thunder is produced due to:
Answer: b) Rapid heating of air
Explanation: Lightning superheats surrounding air, causing sudden expansion that produces thunder sound.
Explanation: Lightning superheats surrounding air, causing sudden expansion that produces thunder sound.
10. Safe place during lightning is:
Answer: c) Inside building
Explanation: Buildings with lightning conductors provide safety by directing charges to the ground.
Explanation: Buildings with lightning conductors provide safety by directing charges to the ground.
11. Charging by rubbing is called:
Answer: c) Friction
Explanation: Rubbing transfers electrons, creating static electricity.
Explanation: Rubbing transfers electrons, creating static electricity.
12. Like charges:
Answer: b) Repel
Explanation: Similar charges push each other due to electrostatic force.
Explanation: Similar charges push each other due to electrostatic force.
13. Unlike charges:
Answer: b) Attract
Explanation: Opposite charges pull each other.
Explanation: Opposite charges pull each other.
14. Tremors are:
Answer: b) Small earthquakes
Explanation: Mild shaking of Earth’s surface is called tremor.
Explanation: Mild shaking of Earth’s surface is called tremor.
15. Seismic waves travel through:
Answer: c) Earth layers
Explanation: Energy released travels through Earth as seismic waves.
Explanation: Energy released travels through Earth as seismic waves.
16. Zone with frequent earthquakes:
Answer: a) Seismic zone
Explanation: Regions prone to earthquakes are seismic zones.
Explanation: Regions prone to earthquakes are seismic zones.
17. First aid during earthquake:
Answer: c) Take cover under table
Explanation: Protects from falling objects.
Explanation: Protects from falling objects.
18. Lightning conductor is installed on:
Answer: b) Buildings
Explanation: Protects structures from lightning damage.
Explanation: Protects structures from lightning damage.
19. Transfer of charge without contact:
Answer: b) Induction
Explanation: Charges rearrange without touching.
Explanation: Charges rearrange without touching.
20. Device protecting electrical appliances:
Answer: a) Fuse
Explanation: Fuse melts during excess current, preventing damage.
Explanation: Fuse melts during excess current, preventing damage.
