Physical Quantities and Measurement
ICSE · Class 7 · Physics
Flashcards for Physical Quantities and Measurement — ICSE Class 7 Physics. Quick Q&A cards covering key concepts, definitions, and formulas.
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State the meaning of measurement.
Answer
Measurement is a process of comparison of the given unknown quantity with a fixed known quantity of the same kind called the unit.
What is the S.I. unit of length, and how is length measured?
Answer
Length is the distance between two points. Its S.I. unit is metre (m). It is measured with a metre ruler or a measuring tape.
What is the S.I. unit of mass, and which instrument measures mass?
Answer
Mass is the quantity of matter contained in a body. Its S.I. unit is kilogram (kg). It is measured using a beam balance or an electronic balance.
What is the S.I. unit of time, and which instruments measure time?
Answer
Time is the interval of occurrence of an event. Its S.I. unit is second (s). It is measured with a pendulum clock, watch, stop-clock, or stop watch.
What is the S.I. unit of temperature, and which instrument measures it?
Answer
Temperature measures the hotness or coldness of a body. Its S.I. unit is kelvin (K). Other common units are degree Celsius and degree Fahrenheit. It is measured using a thermometer.
Find the volume of a cube with side 4 cm.
Answer
Given: side = 4 cm Formula: Volume of a cube = (one side)^3 Step 1: Volume = (4 cm)^3 Step 2: Volume = 4 cm × 4 cm × 4 cm Step 3: Volume = 64 cm^3 Answer: 64 cm^3…
Find the volume of a cuboid with length 10 cm, breadth 5 cm, and height 2 cm.
Answer
Given: length = 10 cm, breadth = 5 cm, height = 2 cm Formula: Volume of a cuboid = length × breadth × height Step 1: Volume = 10 cm × 5 cm × 2 cm Step 2: Volume = 100 cm^3 Answer: 100 cm^3…
Find the volume of a cylinder with radius 3 cm and height 10 cm. Use π = 3.14.
Answer
Given: radius = 3 cm, height = 10 cm, π = 3.14 Formula: Volume of a cylinder = π × (radius)^2 × height Step 1: Volume = 3.14 × (3 cm)^2 × 10 cm Step 2: Volume = 3.14 × 9 cm^2 × 10 cm Step 3: Volume = …
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