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Physical quantity is considered one of the most asked concept.
23 Questions around this concept.
Which of the following is NOT a fundamental physical quantity?
The ratio of intensities of consecutive maxima in the diffraction pattern due to a single slit is
A quantity which can be measured and expressed in the form of laws is called a Physical quantity.
A physical quantity is expressed completely by its magnitude and unit
One physical quantity can be represented in terms of one or more units.
For a physical quantity
nu =constant
So
So
So Larger the unit smaller will be the magnitude.
Types of the physical quantity
1) Scalar Quantity
The quantities having magnitude only are known as scalar quantity.
It does not specify the direction.
Scalar quantity can be added or subtracted by the laws of addition or subtraction
Examples-Distance, time, work, energy, etc......
2) Vector Quantity
The quantities having both directions as well as magnitude are known as vector quantities.
It has a specific direction.
Vector quantity can be added and subtracted according to vector laws of addition.
Examples - Displacement , force ,velocity, acceleration, momentum ....etc.
3) Tensor Quantity
Scalar and vector are special cases of a tensor.
Tensors are represented in the multi-dimensional array, i.e, in different directions, tensor will have different magnitudes.
If a tensor has only magnitude and no direction, it is called scalar
If a tensor has magnitude and one direction, it is called vector.
Examples- Stress, The moment of inertia, coefficient of viscosity
4) Ratio Quantity
When a physical quantity is the ratio of two similar quantities.
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