Answer: Option B. -> leakage of electric current
:
B

Earthing is the process of creating an alternative path for the flow of fault/excessive currents safely into the ground. Earthing is provided in buildings to protect us from electrical shocks due to any leakage of electric current in any appliance.

Answer: Option B. -> Earthquake
:
B
Among cyclone, thunderstorm, earthquake and floods, we cannot predict the occurrence of earthquakes beforehand.
Cyclones have a point of origin and they take time to reach the location where they cause destruction. Formation of cyclones and thunderstorms can be predicted with the weather conditions in a region.
Floods are the consequence of incessant rains or rising water levels in the water bodies in the region. Hence, they can be predicted.

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 and we get time to take measures to protect ourselves from the damage.

Answer: Option C. -> Tsunami
:
A, B, and C

Earthquake is caused by a disturbance deep inside the Earth's crust. They can cause immense damage to buildings, bridges, dams and people. In addition, they can also cause floods, landslides and tsunamis. Rainfall is an indepenent phenomenon that occurs primarily due to winds and saturation of humidity.

Answer: Option B. -> False
:
B
Lightning can strike telephone cords, electrical wires and metal pipes during a thunderstorm, so contact with these should be avoided. It is safer to use mobile phones and cordless phones. However, it is wise not to call up a person who is receiving your phone through a wired phone. 

Answer: Option D. -> higher than 7
:
D
A major earthquake occurred in 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 A. -> Crust
:
A
Earthquakes are caused by tremors due to the shaking of ground. These tremors are caused by disturbances caused in the tectonic plates. These plates are deep down inside the uppermost layer of the earth called the crust.

Answer: Option B. -> fault zones
:
B and D
Earthquakes are caused by the movement of tectonic plates, the boundaries of the plates are the weak zones where earthquakes are more likely to occur. The weak zones are also known as seismic or fault zones.