Seismic Waves

Q.

The waves generated by the earthquake tremors are called:

(a) ultrasonic waves (b) rhythmic waves (c) systemic waves (d) seismic waves

Q. What are seismic waves caused by?

1. Volcanoes
2. Traffic
3. Earthquakes
4. Thunder

Q.

Statement 1: An earthquake is caused by a disturbance ​in the inner core of the earth. ​

Statement 2: Tremors on the surface of earth produce ​seismic waves which are recorded by seismograph.​

Q.

An earthquake-prone area is known as:

1. Picturesque zone

2. Seismic hazard zone

3. Tectonic zone

4. Nuclear Hazard Zone

Q.

Earthquakes can cause a tsunami.

1. True
2. False

Q.

Choose the correct option:

Statement 1: Some animals start showing abnormal behavior before earthquake comes. However, human beings do not feel anything before the main shock.
Statement 2: Earthquake produces infrasonic waves, with a frequency less than 20 Hz, before the main shock. Some animals are able to perceive the infrasonic waves so they start showing abnormal behavior. However, human beings are not able to perceive these infrasonic waves. So, they don't show any reaction.

1. Statement 1 is correct but statement 2 is wrong

2. Both Statements are correct but statement 2 is not the correct explanation for statement 1

3. Both statements are wrong

4. Both Statements are correct and statement 2 is the correct explanation for statement 1

Q. The point where seismic waves originate is called the _______ of the earthquake

1. epicenter
2. centre
3. focus
4. origin

Q. what us the phase difference between the displacement wave and pressure wav

Q. Seismic zones are also called_______

Q.

Which is a horseshoe-shaped zone found along the Pacific rim, where around 90% of the world?

Q. How do you appreciate the efforts of scientists to develop an instrument to assess the intensity and source of earthquake? [4 marks]

Q. The epicenter is the point inside the earth where the earthquake originates

1. True
2. False
3. Ambiguous
4. Data insufficient

Q. What are seismic waves caused by?

1. Aerial explosion
2. Traffic
3. Earthquakes
4. Heavy rain

Q. Choose the correct statement:

1. Seismic waves travel faster through more dense material.
2. Seismic waves travel at one speed regardless of the density of the material.
3. It is not possible to record the speed of seismic waves.
4. Seismic waves travel faster through less dense material.

Q. What are seismic waves caused by?

1. Traffic
2. Earthquakes
3. Volcanoes
4. Thunder

Q. The point inside earth's surface where an earthquake begins is known as:

1. None of these
2. Fault point
3. Crack point
4. Focus point

Q. Earthquake waves are of which type?

1. Intrasonic
2. Supersonic
3. Ultrasonic
4. Infrasonic

Q. Waves produced due to the earthquake are known as

1. seismic waves
2. shock waves
3. infrasonic waves
4. Tectonic waves

Q. What do we use to record seismic waves?

1. Seismometer
2. Seisomograph
3. Seismonomer
4. Seismoscope