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A vernier calliper is a measuring device that is used for very accurate linear measurement.
- It is designed by Pierre Vernier of France in 1631.
- It is also used for the measurement of the diameters of round objects with the help of the measuring jaws.
The density of a substance is defined as the mass per unit volume of the substance. The formula of density is given by
Density, ρ = mass (m) / Volume (V)
The SI unit of density is Kg/m3
Ques. What is the apparatus required for this experiment?
Ans. The apparatus required for this experiment are
- a vernier callipers
- a small rectangular metallic block or glass slab of known mass
- A magnifying lens.
Ques. Explain the theory behind the experiment “To measure the dimensions of a given regular body of known mass using a Vernier Callipers and hence find its density”?
Ans. The measurement of the rectangular block is taken with the help of vernier callipers and the volume of the block is calculated.
The volume of a rectangular block = Length x Breadth x Thickness
The density of the block is further calculated by using the formula,
Density = Mass/Volume
Ques. What is Vernier Calliper?
Ans. A vernier calliper is a measuring device that is used for the very accurate measurement of linear dimensions. It is also used for the measurement of the diameters of round objects with the help of the measuring jaws.
Ques. What do you mean by Vernier constant?
Ans. The vernier constant is defined as the difference between the values of one main scale division and one vernier scale division.
Vernier constant is also known as the least count of vernier calliper i.e. the minimum length that can be measured accurately using this instrument.
Ques. Why is a slide calliper called Vernier Callipers?
Ans. A slide calliper is first designed by Pierre Vernier that’s why it is called Vernier Callipers.
Ques. Define the density of a substance.
Ans. The density of a substance is defined as the mass per unit volume of the substance. It is also known as the volumetric mass density or specific mass. It is denoted by a symbol ⍴ or D.
Ques. What is the difference between mass and weight?
Ans. Mass is a fundamental quantity that is defined as the amount of matter contained in a body. Its SI unit is kilogram (kg).
Weight is defined as the force of gravity acting on a body. The formula of weight is
W = mg
Where
- m is the mass of the body
- g is the acceleration due to gravity
Ques. What is meant by a measuring tool?
Ans. Measuring tools are the devices that are used to take a count of quantitative data of a body, such as length, temperature, height, width, etc.
Ques. What are the main examples of measuring tools?
Ans. The main examples of measuring tools are
- Vernier callipers
- Screw gauge
- Dial gauge
- Rope gauge
- Sheave gauge
- Rulers
Ques. What is meant by least count (L.C.)?
Ans. Leat count is defined as the smallest value that can be measured by using a measuring instrument.
Ques. What is the SI unit of density?
Ans. The SI unit of density is kilogram per cubic meter (kg m-3).
Ques. What is meant by volume?
Ans. Volume is a mathematical quantity that shows the amount of three-dimensional space occupied by a closed surface or by an object.
Ques. What is the SI unit of volume?
Ans. The SI unit of volume is a cubic meter (m3).
Ques. What is the use of sliding jaws of vernier callipers?
Ans. The use of sliding jaws of vernier callipers is to measure the diameter of a sphere.
Ques. Which is more accurate a vernier calliper or a screw gauge?
Ans. A screw gauge is a more accurate measuring device than a vernier calliper because the least count of an vernier calliper is 0.1 mm and that of the screw gauge is 0.01 mm.
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