Classification Of Objects

    Question 1 Define the term object? Question 2 Define the term material? Question 3 Name the main groups into which all the objects around us can be classified? Question 4  Name the groups into which all the living things are classified? Question 5 Name the groups into which all the non-living things are classified? Question 6…

    Making of Fabric

    Question 1 What is loom? Question 2 What is the difference between handloom and powerloom? Question 3 What is meant by weaving? Question 4 What is knitting? Question 5 Name three devices for making yarn from fibres? Question 6 Name 2 processes by which fabrics can be made from yarn? Question 7 What is meant…

    Types of Fibres

    Question 1 Name the animal from which wool is commonly obtained? Question 2 What are the two types of fibres?Give example of each type of fibre? Question 3 What is ginning?How is it done? Question 4 State the uses of cotton fibres? Question 5 Name few fibres obtained from plants? Question 6 Name few fibres…

    Fibres

    Question 1 Define the term fibre? Question 2 What is meant by term fabric? Question 3 Describe the process of making fabrics from fibre? Question 4 Give few examples of fibres? Question 5 Name 4 types of fabrics used by us? Question 6 What is yarn? Question 7 State the various uses of cotton fibres?…

    Deficiency diseases

    Question 1 Name the disease caused by deficiency of proteins as well as carbohydrate? what are the symptoms of this disease? Question 2 Name the disease caused by deficiency of proteins in the diet of children?Give the symptoms of this disease? Question 3 What are the causes and symptoms of disease beri-beri? Question 4 The…

    Balanced Diet

    Question 1 Define the term diet? Question 2 How does the balanced diet of a man doing hard work differ from another man doing normal work? Question 3 Why does a labourer need more carbohydrate in his diet than normal? Question 4 State pre-cooking practices which lead to the loss of nutrients in food materials?…

    Components of Food

    Question 1 Name the nutrients present in our food which give mainly energy to our body? Question 2 Name the nutrient which is needed for the growth and repair of our body? Question 3 Name the major nutrients in our food? Question 4 Name few foods each rich in fats, proteins, carbohydrates, vitamins, minerals? Question…

    Food Producers and Consumers

    Question 1 What are food producers?Give example? Question 2 What are food consumers?Give example? Question 3 All the animals can be divided into three main groups on the basis of their food habits?Name these three groups? Question 4 What are herbivores?Give example? Question 5 What are carnivores?Give example? Question 6 What are omnivores?Give example? Green…

    Animal Product as Food

    Question 1 Name any four food products prepared from milk? Question 2 Name five food material which come from animals? Question 3 Name the food item provided by honey bee? Question 4 How do honeybees make honey? Question 5 what is a hive? Animal products which are used as food are eggs, chicken, mutton, fish, honey, milk etc. …

    Plant Parts as Food

    Question 1 Name any five plant parts which are eaten as food? Question 2 Name 2 plants roots which are eaten as food? Question 3 Name 2 plants whose stems are used as food? Question 4 Name 2 plants whose leaves are eaten as food? Question 5 Name 2 plants whose flowers are eaten as food? Question 6…

    Food

    Question 1 What is food? Question 2 Give 5 examples of food? Question 3 Name the major ingredients of idli? Question 4 Why food is necessary for us? Question 5 Define the term dish? Question 6 Define the term ingredient? Question 7 Give few examples of vegetable oil? Anything which we eat to live is…

    Types of organic reactions

    All the organic reactions can be classified into the following eight types: Substitution reactions Addition reactions Elimination reaction Rearrangement reactions Condensation reaction Isomerisation reaction Pericyclic reactions Polymerization reactions Substitution reaction A substitution reaction is that which involves the direct replacement of an atom or a group of atoms in an organic molecule by another atom…

    Free Radicals

    A free radical may be defined as an atom or a group having an odd or unpaired electron.These are generally produced by homolytic cleavage of a covalent bond. Classification Free radicals are also classified as primary (1°) , secondary (2°) and tertiary (3°) according as the carbon carrying the unpaired electron is primary, secondary and…

    Carbanions

    Chemical species bearing a negative charge on carbon and possessing eight electrons in its valence shell are called carbanions. These are produced by heterolytic cleavage of covalent bonds in which the shared pair of electrons remains with the carbon atom. Classification of carbanion Carbanions are also classified as primary (1°), secondary (2°) and tertiary (3°)…

    Carbocations

    Most of the organic reactions occur through the involvement of certain chemical species.These are generally short lived and highly reactive and hence cannot be isolated.These short lived highly reactive chemical species through which the majority of the organic reactions occur are called reactive intermediates. Ex: Carbocation, carboanion, free radical, carbenes and nitrenes. Carbocation Chemical species…

    Hyperconjugation Effect

    The inductive effect of the alkyl group on a saturated carbon chain follows the order: (CH3)3C > (CH3)2CH- > CH3CH2-> CH3– When an alkyl group is attached to an unsaturated system such as double bond or a benzene ring, the order of inductive effect is actually reversed.This effect is called hyperconjugation effect or Baker-Nathan effect….

    Resonance or mesomerism

    The phenomenon of resonance is said to occur whenever for a molecule we can write two or more Lewis structure which differ in the position of electrons but not in the relative position of atoms. The various Lewis structure, none of which is capable of describing all the known properties of the compound are called…

    Inductive and Electromeric Effect

    Fission of a covalent bond Homolytic fission If a covalent bonds breaks in such a way that each atom takes away one electron of the shared pair, it is called homolytic or symmetrical fission. Homolytic fission is usually indicated by a fish arrow which denotes a one electron displacement. For Ex:  The neutral chemical species…