How does heat transfer take place?

How does heat t0 transfer take 

place?

Heat is a form of that can be transferred from one body to another. Heat transfer from one body to another take place when a temperature difference exists between the two objects. Temperature is the degree of hotness or coldness of body. Heat transfer can take place in three  different ways: convention, conduction and radiation. Conduction  of  heat   take place when the two objects are in contact with each other. Heat transfer,  within the body,  also  take place due to this method. In convention,  the  actual  transfer of the heat  take place when the heated molecules of the substances move actually from one place to another. No actual contact between the bodies is required for heat transfer by this process. Radiation is the transfer of heat through electromagnetic waves. No medium or contact is necessary for heat transfer of take place through radiation. The best example for this is the heat energy that we receive from the sun.

Very important Why circulation necessary in our body

Very  important Why circulation  necessary  in our body

The circulatory system regulates the flow of blood throughout the body. It consists of the heart, blood vessels and blood. The circulatory system transport oxygen and nutrients to the tissue and cells of the body. It also collect the waste products from the cells. The continuous circulation of the blood maintains the temperature balance of the body. The blood also has substance that protects  the body from infection and diseases. The circulatory system is divided into three parts of ---pulmonary, coronary and systemic. The pulmonary circulation is the movement of blood from heart to lungs and from back  to  heart. Coronary circulation supplies blood to the heart itself. Systemic circulation is supply of heart itself. The heart to the various parts of  the  body, except lungs, and back.  

                                   

Why we are celebrating Raksha Bandhan festival.

Why we are celebrating Raksha Bandhan festival.

This  festival gained popularity after Rani Karnavati, the widowed queen of Chittor, sent a Rakhi to

Mughal emperor Humayun when she was in need of his help. It is also believed that Draupadi tied Rakhi to Lord Krishna. For    relation to brother and sister Lord krishna to help Draupadi  .

A festival that celebrates the bond between brothers and sisters, it

has the sisters tying a thread around their brother's wrist as a symbol of their love and in turn the brother pledges to protect his sister. Raksha Bandhan in Sanskrit literally means "the tie or knot of protection". It is an ancient Hindu festival that ritually celebrates the love and duty between brothers and their sisters.

Why do star “fall”

Why do star “fall”

The stars do not fall from the sky. In the olden days, the meteoroids were called ‘falling stars’. Meteoroids are small piece of metallic debris. Some of them are very small but large meteoroid  have  also been found. Some of these meteoroids, which enter the Earth atmosphere, burn up. This is due to the friction that they encounter with the Earth’s atmosphere  are  known  as meteors. Those meteors that do not burn up fall to the Earth as rocks and dust. These are known as meteorites. Meteoroids appear as bright streaks of light with a glowing trail and are known as ‘shooting stars’ or ‘falling star’. Meteorites are mostly made up of iron and nikel.

 

 

Why is blood red in colour?

Why is blood red in colour?

           

Blood that flows through our body carries oxygen and nutrients to all parts of our body. It also carries carbon dioxide and waste from the cell. Blood fights infection and helps in maintaining the body temperature. Blood is made of plasma, red blood corpuscles (RBC), white blood corpuscles (WBC) and platelets. The plasma is a clear watery liquid that contain dissolved salts, nutrients, gases, albumin, fibrogen, wastes and hormone. Platelets are  small colourless blood cells that help in clotting the blood . WBCs helps the body to fight infection and disease. The blood gets its colour from the RBCs, the main component of blood. There are almost 20-30 trillion RBCs in the blood. The RBC contains the protein haemoglobin that transport oxygen from the lungs to all parts of the body. The haemoglobin also are carries carbon dioxide from the cells to the lungs.  

Why do animals sometime attack us?

Why do animals sometime attack us?  

tiger

Animal never attack people,  until they feel they are in some kind of danger. It is a natural instinct of survival that prompts it to attack when it fears to be harmed. Mostly an animal would attack you, if you try to harm it .

Some important Full Form

Some important Full Form

ASP- Assistant superintendent of police

ASI – Assistant Sub Inspector

ADG – Additional Director General

ACP –Assistant Commissioner of Police

DG –Distributed Generation

DIG -  Deputy Inspector General

DCP – Deputy Commisssinor of Police

DSP – Deputy Superintendent of Police

IAS – Indian Administrative Service

IPS – Indian Police Service

IFS – Indian Foreign Service

ICG – Indian Coast Guard

IG – Inspector General

SP – Superintendent  of Police

SSP – Senior Superintendent of Police

NDA – National Defence Academy

BSF – Border Security Force

NSG – National Security Guard

UPSC – Union Public Service Commission

NIA – National  Intellegence  Agency

NDRF -  National Disaster Response Force

SDRF - State Disaster Response Fund

 PSC - Public Service Commission

SSC - stands for Staff Selection Commission

Why do spider spin their web

 Why do spider spin their web

                 

Spider spin web to catch their pray ( small insects like fly, mosquitoes etc,. ) so that they can feel on them. To spin the web spider produce a sticky liquid substance from their belly in the form of a fine thread, which turns solids as soon as it comes in contact with the air. Insects that land on the sticky web get caught in it and slowly die. They are then eaten up by the spider.