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1. Why is it not advisable to use a fountain pen while travelling in an aeroplane? a. Air pressure fluctuations can cause leakage in fountain pens .
b. People are frequently advised not to travel by air with .
c. The pressure changes as the plane , affecting the pressure inside the pen.
2. Is there any possibility of making a special device to measure the magnitude of friction directly?
a. Is there any possibility of making a special device to measure the magnitude of friction directly .
b. A is a specific gadget that can directly measure the amount of friction.
c. Friction is .
3. Vidhya feels that mercury is costly. So, instead of mercury she wants to use water as a barometric liquid. Explain the difficulty of constructing a water barometer.
a. is widely used in barometers because its high density allows for a reasonable column height to gauge atmospheric pressure.
b. To achieve the same pressure differential, a water barometer would need to be times taller than a mercury barometer
c. Mercury is \(13.6\) times denser than .
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