Measurements and Experimentation
ICSE · Class 9 · Physics
Flashcards for Measurements and Experimentation — ICSE Class 9 Physics. Quick Q&A cards covering key concepts, definitions, and formulas.
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See them allWhat is measurement?
Answer
Measurement is the process of comparison of a physical quantity with a known standard quantity of the same nature.
What is a unit?
Answer
A unit is a quantity of constant magnitude used to measure magnitudes of other quantities of the same nature.
State the expression for a physical quantity.
Answer
Physical quantity = numerical value × unit. The numerical value shows how many times the unit is contained in the quantity.
What are fundamental units and derived units?
Answer
Fundamental units are independent of other units. Derived units depend on fundamental units and can be expressed in terms of them. Examples of fundamental units are metre, kilogram, and second.
Name the seven fundamental SI units.
Answer
Length: metre, mass: kilogram, time: second, temperature: kelvin, luminous intensity: candela, electric current: ampere, amount of substance: mole.
Which quantities are complementary fundamental units in SI?
Answer
Angle and solid angle are complementary fundamental units. Their units are radian and steradian.
State the rules for writing unit symbols and full names.
Answer
Unit symbols named after scientists begin with capital letters, such as N and J. Other unit symbols are lowercase, such as m and s. Full unit names are always written with a lower initial letter, such…
Convert 2.5 GHz into hertz.
Answer
Given: 2.5 GHz. Since 1 GHz = 10^9 Hz, 2.5 GHz = 2.5 × 10^9 Hz. Answer: 2.5 × 10^9 Hz.
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