Answer: Option D. -> higher than 7
:
D
A major earthquake occurredin India on 8th October 2005 in Uri and Tangdhar towns of North Kashmir and on 26th January 2001 in Bhuj district of Gujarat. Both were among the worst as they impacted thousands of lives. They had magnitudes higher than 7.5 on the Richter scale.

Answer: Option C. -> Earthquake
:
C
Earthquake is one natural phenomenon which we are not yet able to predict. It can cause damage to human life and property on a huge scale. Thunderstorm and lightning can be predicted by meteorological department andwe get time to take measures to protect ourselves from the damage.

Answer: Option C. -> Charge acquired by a glass rod is negative when it is rubbed with silk.
:
C
the glass rod aquires negative charge as it gains elctrons when rubbed with silk.

Answer: Option C. -> Benjamin Franklin
:
C
Lightning conductor is a metal rod usually placed atop high towers and buildings to prevent damage caused by the direct hit of a lightning. The metal rod collects charges and directs it to the earth. It was invented by Benjamin Franklin in 1749.

Answer: Option C. -> B = 100A
:
C
Richter scale is not a linear scale but a logarithmic scale.In the richter scale the magnitude of next value is 10 times the previous value, like 1, 10, 100, 1000. For example, on this scale the vibration of an earthquake with a magnitude of 2 is 10 times greater in amplitude than an earthquake with magnitude of 1. Similarly a difference in magnitude of '2' implies a multiplication factor of 100 for the amplitude and1000 times more destructive energy.

Answer: Option A. -> lightning
:
A
A thunderstorm can be accompanied with lightning and cyclone.

Answer: Option B. -> Electrostatic force
:
B
Electrostatic force or coloumb force are attractive or repulsive forces between particles due to the presence of electric charge in them.

Answer: Option A. -> Static
:
A
The electrical charges generated by rubbing two objects are static and they do not move by themselves.

Answer: Option A. -> to detect and test small electric charges.
:
A
An electroscope is a device that is used to detect the presence of an electric charge on a body. Itis made up of a metal detector knob on top which is connected to a pair of metal leaves hanging from the bottom of the connecting rod. When no charge is present the metals leaves hang loosely downward. In the presence of charge, the leaves repel each other.

Answer: Option D. -> does not let any current to pass through the building and directs the charges to the ground
:
D
Lightning conductor is a metal rod that is placed on a building and connected with the ground with a conducting wire. In case of lightning, the charges find the least resistive path along the lightning conductor and goes to the ground, without posing any danger of current flow through the building.