A barometer is used :

1. to measure atmospheric pressure
2. for weather forecasting
3. as an altimeter to measure heights
4. all of the above

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

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

Which of the following properties of water is incorrect regarding its non-usage as a barometric liquid?

1. It neither wets nor sticks to the glass tube
2. The vapour pressure of water is high
3. The surface of water cannot be easily seen while taking observations
4. The density of water is low.