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Q1. c. m³Q2. c. MercuryQ3. c. 2700Q4. a. KeroseneQ5. d. Its molecules speed up and spread apart, increasing its volume.
Q1. capacityQ2. 1000Q3. speedQ4. overflow jarQ5. graph paper
Q1. False (Equal volumes of two different substances, like water and kerosene, can have different masses because of molecular packing).Q2. TrueQ3. False (A physical balance is used to measure mass, not volume).Q4. TrueQ5. False (1 kg of iron contains the same amount of matter as 1 kg of peas).
Q1. Unit Cube: A cube whose sides are 1 unit long.Q2. Meniscus: The curve formed on the surface of liquids when they are poured in a measuring cylinder.Q3. Density: The quantity of mass per unit volume of a substance.
Concave Meniscus: A downward-forming curve on the surface of liquids inside a cylinder. Example: Water or kerosene.Convex Meniscus: An upward-forming curve on the surface of liquids inside a cylinder. Example: Mercury.Volume: The three-dimensional space occupied by a substance (solid, liquid, or gas). Its SI unit is the cubic metre (
).Area: The amount of surface covered by an object or a place. Its SI unit is the square metre (
).
Q1. Concave meniscus.Q2. Water (or kerosene).Q3. 
(equivalent to 
).Q4. The reading at the lowest level of the concave meniscus should be taken as the volume.
Given: Mass of stone (
) = 
Initial volume (
) = 
Final volume (
) = 
Volume of stone (
) = 
.Given: Mass () = 
Density (
) = 
Convert density to SI units (
):
.
.Given: Speed of the train = 
Time taken = 
.Engineers and architects need to know the densities of various building materials to design bridges and flyovers, allowing them to calculate how strong the foundation and pillars should be.Chemists test the purity of substances by measuring their densities.
Procedure to estimate the area of a leaf:Place the leaf flat on a grid-lined graph paper and draw its exact outline with a pencil.Remove the leaf and count the total number of complete squares inside the drawn outline.Count the total number of almost complete squares inside the outline.Add the number of complete squares and almost complete squares together. This sum gives the approximate surface area in square centimetres (
).Does it give the exact area? No, through this graph paper activity we can only calculate the approximate surface area of a flat object and not its exact surface area.Definition: Speed is the distance travelled by an object per unit time.SI Unit: Metre per second (
).Other common units: Kilometre per hour (
) or centimetre per second (
).Calculation:Given: Distance = 
, Time = 
.
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Answer key
Prepared by: learnloophq@gmail.com
Chapter: 01. Physical Quantities And Measurement
SECTION A: MULTIPLE CHOICE QUESTIONS (MCQs)
SECTION B: FILL IN THE BLANKS
SECTION C: TRUE OR FALSE
SECTION D: EXPLAIN THE TERMS
SECTION E: DIFFERENTIATE BETWEEN CONCEPTS
Q1. Concave Meniscus vs. Convex Meniscus:
Q2. Volume vs. Area:
SECTION F: DIAGRAM-BASED QUESTIONS
SECTION G: SHORT ANSWER & NUMERICAL QUESTIONS
Q1. Solution:
Q2. Solution:
Q3. Solution:
Q4. Answer:
SECTION H: LONG ANSWER & EVERYDAY USE QUESTIONS
Q1. Answer:
Q2. Answer:
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