Some Natural Phenomena Part 3: MCQs (Q51–Q75)
🌩️ Some Natural Phenomena – MCQs for Class 8 Science
Part 3: Q51–Q75
Q51. The release of energy during an earthquake occurs in the form of:
A) Light waves
B) Seismic waves
C) Water waves
D) Sound waves only
✅ Correct Answer: B) Seismic waves
Explanation:
- B) ✔ Seismic waves carry energy through the Earth’s layers.
Q52. Which type of charges are produced when a rubber balloon is rubbed with hair?
A) Positive
B) Negative
C) Both
D) None
✅ Correct Answer: B) Negative
Explanation:
- B) ✔ Balloon gains electrons from hair → negatively charged.
Q53. Which of the following is an artificial cause of earthquake?
A) Landslide
B) Volcanic eruption
C) Nuclear explosion
D) Movement of tectonic plates
✅ Correct Answer: C) Nuclear explosion
Explanation:
- C) ✔ Man-made explosions can trigger earthquakes.
Q54. Which of the following materials is used in a lightning conductor?
A) Rubber
B) Plastic
C) Copper
D) Wood
✅ Correct Answer: C) Copper
Explanation:
- C) ✔ Copper is a good conductor, used to direct charges safely into the ground.
Q55. The time and place of an earthquake cannot be predicted because:
A) Movements are sudden and random
B) They depend on weather
C) They are caused by lightning
D) They are caused by rainfall
✅ Correct Answer: A) Movements are sudden and random
Explanation:
- A) ✔ Sudden plate movement makes prediction impossible.
Q56. The energy stored in rocks before an earthquake is:
A) Mechanical energy
B) Elastic energy
C) Magnetic energy
D) Solar energy
✅ Correct Answer: B) Elastic energy
Explanation:
- B) ✔ Stress builds up in rocks, released as seismic waves.
Q57. Which is the safest place to take shelter during lightning in an open field?
A) Under a tall tree
B) Inside a car with metal roof
C) Near an electric pole
D) In water
✅ Correct Answer: B) Inside a car with metal roof
Explanation:
- B) ✔ Cars act as Faraday cages, keeping charges outside.
Q58. Earthquakes often occur at:
A) Plate boundaries
B) Ocean centres only
C) Polar regions only
D) Deserts
✅ Correct Answer: A) Plate boundaries
Explanation:
- A) ✔ Most earthquakes happen where plates collide or slide past.
Q59. The movement of plates that cause earthquakes occurs in which layer of the Earth?
A) Core
B) Mantle
C) Crust
D) Lithosphere
✅ Correct Answer: C) Crust
Explanation:
- C) ✔ Plate movement occurs in the Earth’s crust.
Q60. The Richter scale measures earthquake:
A) Depth
B) Magnitude
C) Duration
D) Speed
✅ Correct Answer: B) Magnitude
Explanation:
- B) ✔ Magnitude = amount of energy released.
Q61. Which of these is a result of lightning striking?
A) Fires in forests
B) Damage to electrical equipment
C) Human injuries or deaths
D) All of these
✅ Correct Answer: D) All of these
Explanation:
- D) ✔ Lightning can cause all these hazards.
Q62. The place where two plates meet is called a:
A) Epicentre
B) Fault
C) Seismogram
D) Focus
✅ Correct Answer: B) Fault
Explanation:
- B) ✔ Faults are cracks in Earth’s crust where movement occurs.
Q63. Which is a precaution to take during an earthquake inside a building?
A) Use lift to escape
B) Take shelter under a strong table
C) Stand near windows
D) Run to staircase
✅ Correct Answer: B) Take shelter under a strong table
Explanation:
- B) ✔ Strong furniture protects from falling objects.
Q64. The ground shaking during an earthquake is caused by:
A) Volcanic gases
B) Seismic waves
C) Heavy rains
D) Winds
✅ Correct Answer: B) Seismic waves
Explanation:
- B) ✔ Seismic waves make ground vibrate.
Q65. The lightning conductor is connected to the:
A) Ceiling of building
B) Water tank
C) Ground (Earth)
D) Switchboard
✅ Correct Answer: C) Ground (Earth)
Explanation:
- C) ✔ Lightning conductor provides a safe path to Earth.
Q66. Which of the following is a result of tectonic plate movement?
A) Earthquakes
B) Volcanoes
C) Mountain formation
D) All of these
✅ Correct Answer: D) All of these
Explanation:
- D) ✔ All occur due to plate movements.
Q67. What is the magnitude of a mild earthquake on the Richter scale?
A) Less than 4
B) 4–5
C) 5–6
D) More than 7
✅ Correct Answer: A) Less than 4
Explanation:
- A) ✔ Mild quakes are below 4 magnitude.
Q68. When does a tsunami occur?
A) Due to volcanic eruption
B) Due to landslides under sea
C) Due to earthquake under sea
D) All of these
✅ Correct Answer: D) All of these
Explanation:
- D) ✔ Tsunamis can result from any disturbance in sea floor.
Q69. Which property of charges explains lightning?
A) Charges cannot move
B) Like charges attract
C) Unlike charges attract
D) Charges are massless
✅ Correct Answer: C) Unlike charges attract
Explanation:
- C) ✔ Opposite charges in clouds and Earth attract → discharge.
Q70. Which of these is NOT a safety measure during lightning?
A) Stay indoors
B) Avoid open fields
C) Use umbrella with metal rod
D) Avoid touching electrical appliances
✅ Correct Answer: C) Use umbrella with metal rod
Explanation:
- C) ✔ Metal rod attracts lightning → unsafe.
Q71. Earthquake-prone zones are marked on maps as:
A) Seismographs
B) Seismic zones
C) Epicentres
D) Hotspots
✅ Correct Answer: B) Seismic zones
Explanation:
- B) ✔ Earthquake risk areas are marked as seismic zones.
Q72. The largest recorded earthquake occurred in:
A) India
B) Chile
C) Japan
D) USA
✅ Correct Answer: B) Chile
Explanation:
- B) ✔ 1960 Chile earthquake (magnitude 9.5) is the largest recorded.
Q73. Lightning produces:
A) Heat only
B) Light only
C) Heat and light both
D) Sound only
✅ Correct Answer: C) Heat and light both
Explanation:
- C) ✔ Lightning releases heat, light, and sound.
Q74. The strength of earthquake vibrations is measured by:
A) Thermometer
B) Richter scale
C) Barometer
D) Ammeter
✅ Correct Answer: B) Richter scale
Explanation:
- B) ✔ Richter scale records magnitude of vibrations.
Q75. Which safety rule is correct during an earthquake?
A) Stand near tall buildings
B) Take shelter under heavy furniture
C) Use elevators to escape
D) Stand on rooftop
✅ Correct Answer: B) Take shelter under heavy furniture
Explanation:
- B) ✔ Heavy furniture or strong tables protect from falling debris.
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