This is the correct option. Anemometer is an instrument used for measuring wind speed.

This is the correct option as this statement is false. At sea level, air exerts a pressure of 1.033 kg/cm³.

This is the correct option. Insecticide spray pumps work on this principle. When the pump is pumped, the air comes out of it at a very high speed. This, in turn, reduces the pressure over the small tube, which is dipped in the insecticide. This causes the liquid insecticide to rise up and is blown out in the form of fine spray.

This is the correct option. Cyclone - It is the spiralling winds formed in tropical seas due to the formation of low pressure region in the sea and moving at a speed of 120 km/h. Thunderstorm - It is the storm accompanied by rain and lightning and moving at a speed of 89-102 km/h. Tornado - It is the dark funnel shaped cloud formed on land such that it reaches from the sky to the ground.

This is the correct option. Earth is almost a round sphere inclined at an angle of 23.5 degrees to its path around the Sun.

This is the correct option. The rising up of smoke when someone burns a heap of dry leaves is an example to prove that hot air rises upwards and cold air sinks down.

This is the correct option. The air in the southern hemisphere blows in the North-West direction. This is due to the West to East rotation of Earth.

This is the correct option. In West Indies, the high-speed winds are called hurricanes; in China, the high-speed winds are called typhoons and in Australia, the high-speed winds are called willy-willies.

This is the correct option as this statement is false. Destructive capacity of a wind storm increases with the increase in wind speeds.

This is the correct option. Thunderstorm is caused by violent air currents inside the cumulus clouds. They are low-level clouds that are found at the height of less than 3300 ft.

This is the correct option. In India, in the months of May and June, the Sun shines equally on water and land mass.

This is the correct option as this is not an example to prove that moving air exerts pressure. While riding a bicycle, if the wind is blowing opposite to the direction of bicycle, it is difficult to drive. It is because the moving air from the opposite direction exerts a good amount of pressure.

This is the correct option as this statement is false. The rubbing of water and ice particles builds up a negative electric charge in the clouds.

This is the correct option as this is not a precaution to be taken during a thunderstorm. Shelter should not be taken under a big tree or a high rise buildings as they are likely to be struck by lightning.

This is the correct option. Hurricanes develop over the oceans in latitudes 8 degree to 15 degree North and South. It is an extremely large, powerful and destructive storm with very strong winds.