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Multiple choice various types of barometer fluids physics
Mark the correct statement about Aneroid barometer.

  1. It is portable

  2. It is heavy in weight

  3. It cannot be fixed in any plane

  4. All the above
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Aneroid barometers are those barometers that do not use liquid to tell the atmospheric pressure. They are popular because of the portability due to their small weight and size.The Aneroid barometer uses a small, flexible metal box called an aneroid cell (capsule). The evacuated capsule (or usually several capsules, stacked to add up their movements) is prevented from collapsing by a strong spring. Small changes in external air pressure cause the cell to expand or contract. This expansion and contraction drives mechanical levers such that the tiny movements of the capsule are amplified and displayed on the face of the aneroid barometer. 

Multiple choice various types of barometer fluids physics


Barometer which is calibrated directly to read the atmospheric pressure is

  1. Aneroid barometer

  2. Fortin's barometer

  3. Simple barometer

  4. None
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

The Aneroid barometer uses a small, flexible metal box called an aneroid cell (capsule). The evacuated capsule (or usually several capsules, stacked to add up their movements) is prevented from collapsing by a strong spring. Since the instrument calibrated directly to read the atmospheric pressure, small changes in external air pressure cause the cell to expand or contract. This expansion and contraction drives mechanical levers such that the tiny movements of the capsule are amplified and displayed on the face of the aneroid barometer. 

Multiple choice various types of barometer fluids physics
Barometer which do not require any prior adjustment for reading atmospheric pressure is

  1. Aneroid barometer

  2. Fortin barometer

  3. Simple barometer

  4. All the above
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Aneroid barometers are popular for their light weight and size which increases its portability. The Aneroid barometer uses a small, flexible metal box called an aneroid cell (capsule). The evacuated capsule (or usually several capsules, stacked to add up their movements) is prevented from collapsing by a strong spring. Small changes in external air pressure cause the cell to expand or contract. This expansion and contraction drives mechanical levers such that the tiny movements of the capsule are amplified and displayed on the face of the aneroid barometer.  


Since it is calibrated directly for the atmospheric pressure, no prior adjustments are required to be made before its usage.

Multiple choice various types of barometer fluids physics

Mark the correct statement about Aneroid barometer.

  1. It does not need any prior adjustment for reading atmospheric pressure.

  2. It is light in weight

  3. It is portable in nature

  4. All the above
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation
Aneroid barometers are popular for their light weight and size which increases its portability. The Aneroid barometer uses a small, flexible metal box called an aneroid cell (capsule). The evacuated capsule (or usually several capsules, stacked to add up their movements) is prevented from collapsing by a strong spring. Small changes in external air pressure cause the cell to expand or contract. This expansion and contraction drives mechanical levers such that the tiny movements of the capsule are amplified and displayed on the face of the aneroid barometer.  Since it is calibrated directly for the atmospheric pressure, no prior adjustments are required to be made before its usage.
Multiple choice various types of barometer fluids physics

The measurement of altitude is known as

  1. Altimetry

  2. Altimeter

  3. barometry

  4. None
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

The instrument used to measure the altitude is known as altimeter whereas altimetry is defined as the measurement of altitude.

Multiple choice various types of barometer fluids physics
What is the advantage of negligible vapour pressure of mercury.

  1. It does not affect the barometric height

  2. It gives the correct reading

  3. It is easily seen while taking the reading

  4. All the above
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

The surface of mercury is shiny and opaque. Therefore it is easily seen while taking the observation. The vapor pressure of mercury is negligible. Hence the barometric height is not affected. The mercury neither sticks nor wets the glass tube.


Multiple choice various types of barometer fluids physics

If two identical mercury drops are combined to form a single drop,then its temperature will

  1. decrease

  2. increase

  3. remains the same

  4. none of these
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

There will be a very small increase in temperature$.$ The surface area of the combined drop will be smaller than the original combined surface area of the two drops$.$ There is a small amount of work done by the surface tension as it pulls in the excess surface$.$ 

Since the system is adiabatic by your definition$.$ then the energy has to remain within the mercury$.$ At first$,$ the drop will jiggle around$.$ but eventually$,$ that motion will damp out to the viscosity in the mercury$.$ That will raise the temperature a very  tiny amount$.$
Hence$,$ option $(B)$ is correct$.$ 

Multiple choice various types of barometer fluids physics
Which of the following is not an advantage of using mercury as a barometric liquid.

  1. It does not affect the barometric height

  2. It gives correct reading

  3. It is easily seen due to its shiny appearance

  4. All the above
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

The surface of mercury is shiny and opaque. Therefore it is easily seen while taking the observation. The vapor pressure of mercury is negligible. Hence the barometric height is not affected. The mercury neither sticks nor wets the glass tube.

Multiple choice various types of barometer fluids physics
Mercury .......... under vacuum conditions.

  1. Evaporates

  2. Does not evaporate

  3. No relation of evaporation with mercury

  4. All the above
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Mercury does not evaporate under vacuum conditions, whereas water does. Hence water is not used in barometers due to this effect whereas mercury is highly preferred.

Multiple choice various types of barometer fluids physics
Mercury is the densest liquid known. What is the advantage of this property?

  1. It can record the true pressure.

  2. It can be easily seen while taking observation.

  3. It does not affect the barometric height.

  4. Short column of it can counter balance the atmospheric pressure.
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

The atmospheric pressure measured by mercury barometer is the pressure equal to that at the bottom of the mercury column given by $h\rho g$.

Due to high value of $\rho$ the same pressure can be measured for smaller value of $h$.