Nose bleeding occurs at high altitudes because :

1. the blood pressure becomes less than the atmospheric pressure
2. the blood pressure becomes equal to the atmospheric pressure
3. the blood pressure becomes more than the atmospheric pressure
4. not related with atmospheric pressure.

Simple barometer was first designed by :

1. Sir Issac Newton
2. Pascal
3. Torricelli
4. Thomas Alva Edison

At the summit of Mount Everest, the atmospheric pressure is :

1. only 40% of the atmospheric pressure at sea level
2. only 60% of the atmospheric pressure at sea level
3. only 30% of the atmospheric pressure at sea level
4. only 50% of the atmospheric pressure at sea level

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.