Tag: physics

Questions Related to physics

Fluid used in Aneroid barometer is
various types of barometer fluids physics

  1. Mercury

  2. Glycerine

  3. Kerosene

  4. None

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Correct Option: D
Explanation:

The word 'aneroid' means dry. They are called dry because they do not use any fluid in them. They work on the bulging and compression of diaphragm.

Most commonly known barometric fluid is

various types of barometer fluids physics

  1. Mercury

  2. Liquid oxygen

  3. Nitrogen

  4. Ammonia

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Correct Option: A
Explanation:

The first reason to use mercury is its high density. 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 $h$.
Also the vapor pressure of mercury is negligible, due to which the barometric height is not affected.

Aneroid word in Aneroid barometer means
various types of barometer fluids physics

  1. Wet

  2. Moist

  3. Dry

  4. Overflowing

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Correct Option: C
Explanation:

'Aneroid' means dry. Aneroid barometers are those barometers that do no require any fluid to work and measure atmospheric pressure. Hence they are called dry barometers due to this absence of any fluid(specially liquid).

If we use water, instead of mercury, as a barometric liquid,

various types of barometer fluids physics

  1. the glass tube needs to be much longer

  2. the glass tube needs to be of same length

  3. the glass tube needs to be much shorter

  4. the glass tube needs to be narrower

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Correct Option: A
Explanation:

Mercury is the heaviest liquid. Therefore, it rises only to a height of $76cm$ to balance the atmospheric pressure. Water, being $13.6$ times lighter than mercury, will rise to a $13.6$ times larger height. So, the glass tube needs to be much longer.

 ______ is used as barometric liquid as it does not vaporise under vacuum condition.

various types of barometer fluids physics

  1. water

  2. air

  3. Mercury

  4. petrol

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Correct Option: C
Explanation:

True. Mercury is used as barometric liquid because it does not vaporise under vacuum condition.

Mark the correct advantage of fortin's barometer.

various types of barometer fluids physics

  1. It is portable

  2. It a makes move accurate reading than simple barometer

  3. Both

  4. None

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Correct Option: C
Explanation:

Fortin's barometer is widely used in laboratories and in meteorological departments. Main advantage of Fortin's barometer is it is portable and it allows the mercury level in the cistern to be set to zero. this makes the reading move accurate.

Barometer which does not use any liquid is known as _________ barometer

various types of barometer fluids physics

  1. fortin's

  2. aneroid

  3. simple

  4. none

Show answer
Correct Option: B
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. 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?

various types of barometer fluids physics

  1. Thin material sheet.

  2. Vacuum chamber

  3. Permanent magnet.

  4. Levers.

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Correct Option: C
Explanation:

Aneroid barometer consists of:

1. A thin material sheet used as a top.
2. Vacuum chamber.
3. Levers.
4. Pointer.
5. Calibration scale.

Aneroid barometer

various types of barometer fluids physics

  1. uses liquid

  2. do not use any liquid

  3. both

  4. none

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Correct Option: B
Explanation:

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?

various types of barometer fluids physics

  1. Mercury does not stick to glass.

  2. It has a long glass tube and cannot be easily carried from one place to another.

  3. It requires zero adjustment before taking the reading.

  4. The barometer tube needs to be kept vertical to get the correct reading.

Show answer
Correct Option: A
Explanation:

Mercury barometer has the following disadvantages:

1. It has a long glass tube with no protection to it. So, it cannot be easily carried from one place to another.
2. It requires zero adjustment before taking the reading.
3. The barometer must be kept vertical to get the correct reading.
4. The container in which the glass tube is inverted is open from the top. So, the impurities may fall into it making the mercury impure.