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CNMS ICSE - 7 Std
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Answer key

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Chapter: 01. Physical Quantities And Measurement

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It is important because it helps them design bridges and flyovers, and calculate how strong the foundation and pillars should be.
The volume of a sphere is calculated using the formula V = 4/3 πr³, where r is the radius of the sphere.
The standard unit of speed in the SI system is metre per second (m/s).
The approximate area of a leaf is calculated by adding the total number of complete squares to the total number of almost complete squares enclosed within the leaf’s outline.
The five apparatus used to measure liquid volume are graduated cylinders, graduated beakers, flasks, pipettes, and burettes.
Equal volumes of water and kerosene have different masses because the matter (molecules) in water is more closely packed than in kerosene.
Chemists test the purity of a substance by measuring and verifying its density against standard values.
The standard unit of volume in the SI system is the cubic metre (m³).
The SI unit of density is kilogram per cubic metre (kg/m³ or kgm⁻³).
Area is defined as the amount of surface covered by an object or a place.
When a substance is cooled, its molecules slow down and get closer together, which decreases its volume and increases its density.
The volume of water is read by taking the measurement at the lowest level of its concave meniscus.
The formula to calculate speed is Speed = Distance travelled / Time taken.
The area of a circle is calculated using the formula A = πr², where r is the radius of the circle.
The formula to find density is Density = Mass / Volume (D = M/V).
Objects with a density of less than 1 g/cm³ float because their density is less than the density of water, which is 1 g/cm³.
The volume of a large irregular solid is measured by immersing it in an overflow jar and measuring the volume of the displaced water that overflows into a cylinder.
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