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CNMS ICSE - 7 Std
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Answer in one line

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Chapter: 01. Physical Quantities And Measurement

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ANSWER IN ONE LINE

What is the standard unit of volume in the SI system?
Answer: The standard unit of volume in the SI system is the cubic metre (m³).
Name five types of apparatus used in laboratories to measure the volume of liquids.
Answer: The five apparatus used to measure liquid volume are graduated cylinders, graduated beakers, flasks, pipettes, and burettes.
How do you read the volume of water in a graduated cylinder correctly?
Answer: The volume of water is read by taking the measurement at the lowest level of its concave meniscus.
What is the formula used to calculate the volume of a sphere?
Answer: The volume of a sphere is calculated using the formula V = 4/3 πr³, where r is the radius of the sphere.
How is the volume of a large irregular solid measured if it cannot fit inside a standard measuring cylinder?
Answer: 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.
6". State the definition of the term “area”.
Answer: Area is defined as the amount of surface covered by an object" or a place.
How do you calculate the approximate area of an irregular leaf on a graph paper?
Answer: 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.
What is the formula to find the area of a circle?
Answer: The area of a circle is calculated using the formula A = πr², where r is the radius of the circle.
Why do equal volumes of water and kerosene have different masses?
Answer: Equal volumes of water and kerosene have different masses because the matter (molecules) in water is more closely packed than in kerosene.
State the mathematical formula used to find the density of an object.
Answer: The formula to find density is Density = Mass / Volume (D = M/V).
What is the SI unit of density?
Answer: The SI unit of density is kilogram per cubic metre (kg/m³ or kgm⁻³).
Why is it important for engineers and architects to know the densities of various building materials?
Answer: It is important because it helps them design bridges and flyovers, and calculate how strong the foundation and pillars should be.
How do chemists test the purity of a substance using physical quantities?
Answer: Chemists test the purity of a substance by measuring and verifying its density against standard values.
What is the formula to calculate the speed of an object?
Answer: The formula to calculate speed is Speed = Distance travelled / Time taken.
What is the standard unit of speed in SI units?
Answer: The standard unit of speed in the SI system is metre per second (m/s).
Why do objects with a density of less than 1 g/cm³ float in water?
Answer: 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.
What happens to the volume and density of a substance when it is cooled?
Answer: When a substance is cooled, its molecules slow down and get closer together, which decreases its volume and increases its density.
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