Showing posts with label Conceptual Questions. Show all posts
Showing posts with label Conceptual Questions. Show all posts

Jul 25, 2012

Heat and Thermodynamics

What is heat?
Heat is a form of energy which gives us sensation of warmth. In other words, we can define heat as the total sum of kinetic energy produced due to the vibration of molecules of the element. Its unit is Joule (J) in SI system and calorie in CGS system.

What is temperature?
The degree of hotness or coldness of body is called temperature. It is also defined as the property by virtue of which identify whether the body in thermal equilibrium or not. When two bodies are in thermal contact they posses a common property which is represented by a numerical value is called temperature. Temperature is measured by thermometer. Its unit is Kelvin.

Jul 22, 2012

Electrostatics

An atom is electrically neutral. Why?
Electrons moves round a positively charged nucleus. Nucleus contains as many positively charged protons as there are electrons. The charge carried by an electron and proton are equal in magnitude and opposite in sign. Hence atom as a whole is neutral.

Explain why the induced charges are not always equal to inducing charge in magnitude?
The charge induced on an insulator is always less than inducing charge in magnitude as the insulator has bound charges while charge induced on conductor equals to the inducing charge in magnitude.

Jun 7, 2012

Cell Biology, Conceptual Questions with Answers

1. What is cell?
Cell is the basic structural and functional unit of living organism. It is the smallest unit, that can carry all the process of life.

2. Who discovered the cell?
In 1665 Robert Hooke studied the cell in a thin slice of cork for the first time.

3. Who gave the cell theory?
Schleiden and Schwann gave a cell theory which proposes that the bodies of animals and plants are composed of cells and products of cells.

4. How cell arise?
According to cell theory all cells arise from pre-existing cells.

May 25, 2012

Introduction To Biology

1. Why water is important for our life?
Water is a major chemical of protoplasm which plays a major role in our life.

2. What do you mean by carbohydrate?
Carbohydrates are the organic compounds of carbon, hydrogen and oxygen, where the hydrogen and oxygen are present in the ration 2:1 as in water.

3. Give the name of different types of carbohydrates.
Carbohydrates are classified into monosaccharides, disaccharides and polysaccharides.

Jan 24, 2012

Introduction to Biology

Why calcium is an important life component?
Calcium forms exoskeleton of invertebrates, imparts strength and rigidity to bones and teeth and the middle lamella of plant cell wall consist of calcium pectate. For these function, calcium is considered as an important life component.

What are important life components?
The important life components are basically classified into two types:
1.    Inorganic compounds: Water and Minerals.
2.    Organic compounds: Carbohydrates, lipids, proteins and nucleic acids.