On blowing air into balloon, the size of the balloon increases because
air exerts pressure
warm air rises up
air is stronger than balloon
air pressure is more inside balloon
How does cyclone decrease the fertility of the soil in the coastal areas?
By flooding the land with saline water
By dissolving soil and rocks
By increasing the water table of the place
By decreasing the water table of the place.
Why wind currents are generated ?
Uneven heating between the equator and the poles
Uneven heating between Artic and Antartic continents
Due to thunder storm
Due to cyclone
Air exerts pressure
Downward direction only
Upward direction only
Sideways only
All directions
What is the function of a lightning conductor installed in a building ?
does not allow the lightning to fall on the building
repels the lightning
forces the lightning to fall in an area where there are no buildings
conducts electric charge directly to the ground when lightning strikes the building
The required property of fuse wire is
conductor with low melting point
conductor with high melting point
insulator with low melting point
insulator with high melting point
What will happen after high speed winds blow ?
Air pressure will increase
Air pressure will decrease
water vapour will be formed
static electricity will be generated
The weak zones around the boundaries of plates underneath earth which are prone to slide and causes earth quake are commonly known as
fault zone
eruption zone
explosive zone
sliding zone
Thunderstorm can be a beginning of
Lightning
Cyclone
Hurricane
Tornardo
Cyclone warning can be issued
6 hours in advance
12 hours in advance
24 hours in advance
48 hours
