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Dimensions Of Physical Quantities The dimensions of any physical quantity are those powers which are raised to the basic units to express the unit of that quantity. To write the dimensions of physical quantities in mechanical and thermodynamics, the basic units for length, time, mass, and temperature are represented by L, T, M, and θ … Read more

Physical quantities   All the quantities which are related to any physical phenomena and can be represented by a number and can be measured directly and indirectly are called physical quantities.   Example– Length, mass, temperature, speed, force, time etc.   There are two types of physical quantities   1. Basic quantities  Those physical quantities which … Read more

Significant figures     All the reliable and one doubtful figures included in a measurement are called significant figures.   Some rules for calculating significant figures 1. All non-zero numbers are significant. Example– 1,2,3,5,9 have 5 significant digits.   2. Zero between two non-zero numbers is significant. Example– 12567.09 has 7 significant figures.   3. A … Read more

Octopus blood     Let us talk today about why the color of octopus’s blood is blue and what is the reason for it. After all, what is there in his blood due to which the color of his blood is blue?   Apart from humans, there are many creatures whose blood is red in … Read more

Physical world The correct concept of force is given by Newton’s laws of motion. We experience many forces in the micro world as well as in the macro world. Gravitational force and electromagnetic force are experienced in the physical world. Because the range of both of them is infinite. Whereas in the microscopic world, nuclear … Read more

Huygen’s Principle When we throw a small stone in a calm water pond, waves propagate around the rebound point. Every point on the surface starts oscillating with time. The photograph of the page at any given moment will show the circular rings above which the disturbance is maximum. Apparently, all the points in this type … Read more

Function of simple microscope     A simple magnifier or simple microscope has a converging lens of short focal length. To use this type of lens as a microscope, the lens is placed near the object at one focal length or less than the focal length and on the other hand the eye is kept … Read more

Human Eye       The human eye is a very valuable and sensitive sense organ. It enable us to see the wonderful world and colors around us. The human eye is like a camera. A real, inverted and small image is formed on the retina located at the back of the eye.   Accommodation … Read more