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Multiple choice physics structure of earth seismic waves and tsunami causes of earthquakes origin of earth and its internal energy transfer of charge lightning safety

Earthquake at two places A and B were measured by a seismograph which recorded the magnitude as 2 and 4. The magnitude of tremors and its destructive energy at A and B can be compared as under:

  1. Tremor at B is 2 times to that at place A

  2. Tremor at B is 4 times to that at place A

  3. Tremor at B is 100 times to that at place A

  4. Tremor at B is 1000 times to that at place A
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

Richter scale is not a linear scale. It is a logarithmic scale. A difference in magnitude of $2$ implies a multiplication factor of $10^2 = 100$.

Multiple choice physics structure of earth seismic waves and tsunami causes of earthquakes origin of earth and its internal energy transfer of charge lightning safety

Earthquake at two places A and B were measured by a seismograph which recorded the magnitude as 2 and 4. The magnitude of tremors and its destructive energy at A and B can be compared as under

  1. tremor at B are two times that at place 'A'

  2. tremor at B are four times that at place 'A'

  3. tremor at B are 100 times that at place 'A'

  4. tremor at B are 1000 times that at place 'A'
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

The Richter scale is logarithmic, meaning each whole number increase represents a 10-fold increase in measured amplitude. A difference of 2 units (4 - 2 = 2) corresponds to an increase in amplitude by 10^2 = 100 times.

Multiple choice physics structure of earth seismic waves and tsunami causes of earthquakes origin of earth and its internal energy transfer of charge lightning safety

State whether the given statement is True or False :

The plates of the outermost layer of the Earth are always in continuous motion. 

  1. True

  2. False
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

The outermost layer of the Earth is called as crust. It is not in one piece but fragmented. Each fragment is called as a plate. Such 7-8 major plates are present. Also, there are many minor plates. These plates are in continuous motion. When these plates brush past one another or a plate goes under another, it causes collision. This causes earthquake on the surface of the Earth. Earthquakes occur all the time around the world. But they are too small to be noticed. Major earthquakes are less frequent. Hence, given statement is true.

Multiple choice physics some natural phenomena seismic waves and tsunami causes of earthquakes origin of earth and its internal energy transfer of charge lightning safety

Storms, cyclones, earthquake, lightning etc. are ................ natural phenomena:

  1. constructive

  2. destructive

  3. simple

  4. complex
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Storms, cyclones, earthquakes and lightning are termed as natural calamities. These causes lot of damages to the properties and enviroments. Hence, they are destructive in nature.