Match the correct answer. a. Richter scale i. centre point of earthquake inside the earth b. epicentre waves ii. detection of seismic waves c. focus point iii. vibrations d. tremors earthquake iv. magnitude of earthquake e. seismography. v. centre point of earthquake on earth

a. Richter scale - iv. magnitude of earthquake Richter scale is used to measure the magnitude of the earthquake. The magnitude of the earthquake on the scale is calculated from the amplitude of the largest seismic wave during the earthquake. Richter scale is a logarithmic scale. b. epicentre waves - v. centre point of earthquake on earth The epicentre is a point from which earthquake waves generate to its surroundings. It is the point on the surface of earth vertically above the focus point of seismic waves. c. focus point - i. centre point of earthquake inside the earth Focus point of the seismic waves is the identification point of the origin of an earthquake. It is located deep inside the earth. It is the point on the surface of earth vertically above the focus point of seismic waves. d. tremors earthquake - iii. vibrations Tremors are the vibrations produced during an earthquake. It is an involuntary movement of the earth's surface due to stress in underground rocks. e. seismography - ii. detection of seismic waves Detection of seismic waves can be done using a sensitive instrument called seismograph. It detects any kind of movement on the surface of the earth. It has a pendulum with a metallic string hanging from a base attached to the surface of earth. a. Richter scale iv. magnitude of earthquake b. epicentre waves v. centre point of earthquake on earth c. focus point i. centre point of earthquake inside the earth d. tremors earthquake iii. vibrations e. seismography. ii. detection of seismic waves

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The device which is used to measure strength of an earthquake having magnitude greater than $7$ .

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Important Questions on Some Natural Phenomena

EASY

Science>Physics>Some Natural Phenomena>Earthquakes

The point under the ground where the earthquake begins is called the epicentre.

MEDIUM

Science>Physics>Some Natural Phenomena>Earthquakes

An earthquake measures

2

on the Richter scale. Will it be noticeable?

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Science>Physics>Some Natural Phenomena>Earthquakes

Earthquake is measured on this scale.

EASY

Science>Physics>Some Natural Phenomena>Earthquakes

Replace the underlined word to form the correct statement.

The reading of the Richter scale shows 7, it is regarded as a moderate earthquake.

EASY

Science>Physics>Some Natural Phenomena>Earthquakes

Write the quadrants in which the following points lie:

$(- 4, 7)$

HARD

Science>Physics>Some Natural Phenomena>Earthquakes

What is a seismograph? Explain its construction and working principle.

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Science>Physics>Some Natural Phenomena>Earthquakes

The Richter scale has ten levels.

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Science>Physics>Some Natural Phenomena>Earthquakes

An earthquake of magnitude

2

on Richter scale is:

HARD

Science>Physics>Some Natural Phenomena>Earthquakes

Richter scale is not a linear scale. Explain the statement.

MEDIUM

Science>Physics>Some Natural Phenomena>Earthquakes

Which earthquake will cause more damage: an earthquake of magnitude

5

7

? Why?

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Science>Physics>Some Natural Phenomena>Earthquakes

When the earthquake is more destructive?

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Science>Physics>Some Natural Phenomena>Earthquakes

How is the intensity of an earthquake decided on a Richter scale ?

MEDIUM

Science>Physics>Some Natural Phenomena>Earthquakes

What is a Richter scale? How do we classify earthquakes based on magnitude on this scale?

EASY

Science>Physics>Some Natural Phenomena>Earthquakes

Replace the underlined word to form the correct statement.

The magnitude of an earthquake depends on the size of the rocks.

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Science>Physics>Some Natural Phenomena>Earthquakes

How is the intensity of an earthquake measured?

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Science>Physics>Some Natural Phenomena>Earthquakes

An earthquake measures

3

on the Richter scale. Will it cause excessive damage?

MEDIUM

Science>Physics>Some Natural Phenomena>Earthquakes

Earthquakes that measure _____ (3/6) on the Richter Scale are so violent that they cause extensive damage.

MEDIUM

Science>Physics>Some Natural Phenomena>Earthquakes

What is a Richter Scale?

MEDIUM

Science>Physics>Some Natural Phenomena>Earthquakes

Match the correct answer.

a. Richter scale	i. centre point of earthquake inside the earth
b. epicentre waves	ii. detection of seismic waves
c. focus point	iii. vibrations
d. tremors earthquake	iv. magnitude of earthquake
e. seismography.	v. centre point of earthquake on earth

EASY

Science>Physics>Some Natural Phenomena>Earthquakes

How can we measure the intensity of an earthquake?

The device which is used to measure strength of an earthquake having magnitude greater than 7.

Important Questions on Some Natural Phenomena

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The device which is used to measure strength of an earthquake having magnitude greater than $7$ .