Consider the following statements regarding earthquake measurement: 1. An earthquake is measured with a machine called a barometer. 2. The magnitude of the earthquake is measured on the Richter scale. 3. An earthquake of magnitude 5.0 is classified as a major earthquake. Which of the statements given above is/are correct?

Correct Option The correct option is (b). Explanation Earthquake measurement involves recording seismic waves to determine the event's location, magnitude, and intensity. Instruments record the ground motion, while specific scales are used to quantify the energy released (magnitude) and the severity of shaking at a specific location (intensity). Statement-wise Analysis - Statement 1 is Incorrect: An earthquake is measured with an instrument called a Seismograph (or Seismometer), which records seismic waves. A barometer is used to measure atmospheric pressure. - Statement 2 is Correct: The magnitude of an earthquake is measured on the Richter scale. This scale quantifies the energy released during the earthquake. It is a logarithmic scale, where an increase of one unit represents a tenfold increase in wave amplitude and approximately 32 times more energy. - Statement 3 is Incorrect: An earthquake of magnitude 5.0 is classified as moderate. It may cause slight damage to buildings and other structures. Earthquakes are generally classified as major when they reach a magnitude of 7.0 to 7.9 on the Richter scale. Key Takeaway Seismographs are the instruments used to record earthquakes. The Richter scale measures magnitude (energy released), whereas the Mercalli scale measures intensity (visible damage). A magnitude of 7.0 or higher is required for an earthquake to be termed "major."

Consider the following statements regarding earthquake… - NCERT Class 7 Geography MCQ

NCERT Class 7 Geography — Chapter 2: Our Changing Earth

mcqmedium

Consider the following statements regarding earthquake measurement:

An earthquake is measured with a machine called a barometer.
The magnitude of the earthquake is measured on the Richter scale.
An earthquake of magnitude 5.0 is classified as a major earthquake.

Which of the statements given above is/are correct?

NCERT textbook question

From NCERT The Earth Our Habitat · Page 14

Options

A1 only
B2 only
C1 and 3 only
D1, 2 and 3

Did you get this right?

Solution

Correct Option

The correct option is (b).

Explanation

Earthquake measurement involves recording seismic waves to determine the event's location, magnitude, and intensity. Instruments record the ground motion, while specific scales are used to quantify the energy released (magnitude) and the severity of shaking at a specific location (intensity).

Statement-wise Analysis

Statement 1 is Incorrect: An earthquake is measured with an instrument called a Seismograph (or Seismometer), which records seismic waves. A barometer is used to measure atmospheric pressure.
Statement 2 is Correct: The magnitude of an earthquake is measured on the Richter scale. This scale quantifies the energy released during the earthquake. It is a logarithmic scale, where an increase of one unit represents a tenfold increase in wave amplitude and approximately 32 times more energy.
Statement 3 is Incorrect: An earthquake of magnitude 5.0 is classified as moderate. It may cause slight damage to buildings and other structures. Earthquakes are generally classified as major when they reach a magnitude of 7.0 to 7.9 on the Richter scale.

Key Takeaway

Seismographs are the instruments used to record earthquakes. The Richter scale measures magnitude (energy released), whereas the Mercalli scale measures intensity (visible damage). A magnitude of 7.0 or higher is required for an earthquake to be termed "major."

Your note

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