Answer & Solution
Answer: Option
B
Solution:
Let's understand this question about "Fundamental Quantities".
In Physics, we describe many things using physical quantities. These quantities are mainly divided into two types:
1. Fundamental Quantities
2. Derived Quantities
Think of Fundamental Quantities as the absolute basic building blocks of physics.
They are independent, meaning you cannot define them by using other physical quantities.
There are seven fundamental quantities in the International System of Units (SI system):
- Length
- Mass
- Time
- Electric Current
- Temperature
- Amount of Substance
- Luminous Intensity
Derived Quantities, on the other hand, are quantities that are created by combining (multiplying or dividing) one or more fundamental quantities.
Now let's look at our options to see which one is a fundamental quantity:
Option A: Volume
Volume is calculated as Length × Width × Height. Since Length, Width, and Height are all types of Length (which is a fundamental quantity), Volume is made up of length.
So, Volume is a Derived Quantity.
Option B: Time
Time is one of the seven basic building blocks we listed above. You cannot break it down into other simpler physical quantities.
So, Time is a Fundamental Quantity.
Option C: Velocity
Velocity is calculated as Distance / Time. Distance is a type of Length, and Time is a Fundamental Quantity.
Since Velocity is made from Length and Time, it is a Derived Quantity.
Option D: Force
Force is calculated using Mass × Acceleration. Acceleration itself is (Velocity / Time), and Velocity is (Distance / Time).
So, Force depends on Mass, Length (from Distance), and Time.
Therefore, Force is a Derived Quantity.
Based on our understanding, the only fundamental quantity among the choices is Time.
The correct answer is Option B: Time.
