Tag: fluids
Questions Related to fluids
Barometer which does not use any liquid is known as _________ barometer
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fortin's
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aneroid
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simple
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none
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.
Which of the following is not used in an aneroid barometer?
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Thin material sheet.
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Vacuum chamber
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Permanent magnet.
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Levers.
Aneroid barometer consists of:
Aneroid barometer
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uses liquid
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do not use any liquid
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both
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none
A barometer is an instrument used to measure atmospheric pressure. The two types are liquid and aneroid barometer. Aneroid barometer do not use any liquid.
Which of the following is not a disadvantage of mercury barometer?
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Mercury does not stick to glass.
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It has a long glass tube and cannot be easily carried from one place to another.
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It requires zero adjustment before taking the reading.
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The barometer tube needs to be kept vertical to get the correct reading.
Mercury barometer has the following disadvantages:
The pointer of aneroid barometer should be
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Light
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Frictionless
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Pointed
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All of the above
Light needle and system increases sensitivity of the barometer. Frictionless needle improves the efficiency of the system. Pointed needle improves accuracy and removes human errors.
Define altimeter.
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It is a device derived from an aneroid barometer used to measure height.
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It is a device derived from a simple barometer used to measure height.
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It is a device derived from spring balance used to measure weight.
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It is a device derived from a stopwatch used to measure time.
Altimeter is a device used to measure height at a point. It works on the principle of decrease in pressure with an increase in the altitude and actually measures pressure. Aneroid barometers are generally used as altimeter because it is easy to use and carry.
To scale used in fortin's barometers
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meter scale
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vernier scale
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both
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none
A vernier scale is provided at the top of glass west tube for accurate reading.
Aneroid barometer is preferred over simple barometer when
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carrying simple barometer is not easy.
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more accuracy is required.
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pressure in fluid is not uniform.
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it is never preferred.
Simple barometer is not easy to carry. However, it gives very precise readings. The few drawbacks of simple barometer are counterfeited in an aneroid barometer.
Mercury is the heaviest liquid.
What is the advantage of the given property in the working of a barometer?
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It gives stability to the apparatus.
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Its rises to a maximum height of 76 cm which is the smallest value for a fluid.
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Other impurities float over it.
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It is poisonous.
Since the density of mercury is highest in the liquids, it needs smallest column to measure the pressure reducing the size of the equipment and making it easier to use.
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Protecting the diaphragm from collapsing
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Reducing atmospheric pressure
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Increasing atmospheric pressure
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Magnifying the tiny movement of central lever
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 which is corrugated in form of a diaphragm. 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.