MCQ 11 Mark
$.........$ helps us announce a cyclone alert.
- ✓Satellite.
- BStars.
- CSun.
- DMoon.
Answer
View full question & answer→Correct option: A.
Satellite.
Satellite.
50 questions · timed · auto-graded
During, the daytime when the air above the land gets heated up, the air molecules absorbs the heat and the intermolecular forces between the air molecules become weak and its kinetic energy increases. The air molecules move apart and become less dense and they become lighter and rises up. This creates a low-pressure zone on land and thus cold air from the sea rushes from sea to land and thus creates sea breeze.
Hot air inside baloon is lighter than colder air outside. The reason for this is when air gets heated up it expands and becomes less dense than the air surrounding it ,also the distance between the molecules increases. So hot air occupies more volume and density decreases because less mass is present in same volume.
The advanced technologies, satellites and radars help us by giving a Cyclone alert, $48$ hrs in advance of any expected storm and a Cyclone warning is issued $24$ hrs in advance. The message is broadcasted every hour or every half an hour when a cyclone is nearer the coast.
Hot air rises up and colder air settles down in a room. If $AC$ is placed high on the wall, the cold air blown by $AC$ will settle on the floor and relatively hotter air will rise up. This motion of air current cools the room faster.
Wind currents are produced due to the non-uniform heating of the Earth. That means uneven heating at the equator and the poles. This warm air rises and the making up of cooler air from the regions with the $0-30$ degrees latitude belt on either side of the equator moves in. This is how wind currents are being generated.
Smoke is hotter and lighter than air. The India Meteorological department forecasts cyclones with the help of $INSAT$ satellite. The heated air that rises up gets cooled and sinks which cause the convection currents.
Air pressure is dependent on the temperature of air. More is the temperature, more is the air pressure and vice-versa. In cold air, the temperature is low and so the molecules of air have less kinetic energy. Due to this, the molecules are more closely packed together than in warmer air and so cold air is more dense than warm air. This also suggests that lesser is the temperature of air, more is the density of air and less is the air pressure. Hence, air pressure also depends on the density of the air.
On October $29, 1999$, a super cyclone with a wind speed of $300$ mph had struck Odisha, making it probably the greatest cyclonic disaster ever recorded in the last century.
This is done with the help of the $INSAT$ satellite and chain of Cyclone Detection Radars ($CDRS$) installed along the coastal belt of India. These radars can locate and track an approaching cyclone within a range of $400 \ km.$