At high altitudes, the atmospheric pressure is :

1. less
2. high
3. high due to strong winds
4. low due to the cloud floating above.

Mercury is preferred as a barometric liquid because :

1. its density is high
2. its vapour pressure is negligible
3. it neither wets nor sticks to the glass
4. all of the above

If the barometric height gradually falls, it indicates :

1. a possibility of a storm or cyclone
2. extremely dry weather
3. weather will remain the same.
4. a possibility of rain.

The atmospheric pressure …………… with rising altitudes as the density of air …………… .

1. increases, decreases
2. decreases, increases
3. decreases, decreases
4. increases, increases