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CBSE 10 Chapter Wise Important Question PDF All Subject All the CBSE 10th board students can get benefit from Important Questions for Class 10 Science as it can save a lot of precious time of all the CBSE 10th board students in terms of using the time in a best possible way. Because if, as a CBSE 10th student, you want to make the best use of your time then CBSE 10th Important Questions of Science are the way to go, as, they can save a. Nov 29, �� NCERT Exemplar Class 10 Science is very important resource for students preparing for X Board myboat264 boatplans we have provided NCERT Exemplar Problems Solutions along with NCERT Exemplar Problems Class Question from very important topics are covered by NCERT Exemplar Class You also get idea about the type of questions and method to answer in your Class 10th . CBSE Class 10th NCERT Most Important Questions Weightage in Board Exams CBSE Class 10th Board marks are still a single important attribute which is considered and helps students in choosing their stream (Science/ Commerce/ Arts) in the 11th standard which will decide that what a student is going to pursue for the rest of their life.
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The position of the Important Questions For 10th Ncert Science image formed by a lens can be found by a lens can be found by considering any two of the following rays: i A ray incident parallel to the principal axis, after refraction, passes through the principal focus on other side of lens in a convex lens or appear to diverge from the principal focus located on the same side of a concave lens.

In dealing with lenses we use the same Cartesian Sign Convention as followed for mirror expect that now all the distances are measured from the optical center of the lens. Lens formula is a relation correlating u, v and f for a lens. For an object situated at infinity the point sized image is formed at the principal focus F1. In all other cases the diminished image is formed on the same side of the lens, as the object, between optical center O and principal focus F1.

However, appropriate sign convention must be followed for u, v and f. Convex mirrors are used in vehicles near the driver seat to have a view of traffic coming from behind. As convex mirrors form erect and diminished image only they enable the driver to view much larger area than would be possible with a plane mirror.

The principal focus of a lens is the point on its principal axis where a beam of light incident parallel to its principal axis actually converges to in case of a convex lens or appear to diverge from in case of a convex lens after refraction from the lens.

A lens has two principal foci F1 and F2 one on each side of the lens. The distance of the principal focus from the optical center of a lens is called its focal length f.

There are very short, short and long answers type questions with suitable answers and explanation. Visit to discussion forum to ask more questions related to all subject of standard 10 or high school. What is meant by the light?

What are the properties of light? What is mean by ray of light and beam of light? What is known as the image of the first point? What image formed when the reflected or refracted rays meets at a point? What are the two basic laws of refraction of light? Curved Mirror If the reflecting surface of a mirror is curved one, it is called a curved mirror. What kind of image of an extend object formed by a plane mirror?

What is meant by the spherical mirror? What is meant by the pole and the center of curvature? What is meant by the principle axis and focal length of the mirror? What is formula of focal length? Focal length of spherical mirror is half of its radius of curvature.

Position of the object Position and Narure of the image Size of the image 1. What are the positions of the images formed by the spherical mirror? What is the nature and the position of the image when an object is placed at infinity in case convex mirror? What is meant by the New Cartesian Sign Convention for reflection 10th Science Ncert Question Answer Video by spherical mirror? What is the relation between mirror formula?

Lens A lens is a part of transparent material either bound by two spherical surfaces or bound by one plane and the other spherical surface. What is meant by the refracted index? What is meant by the absolute refractive index? What is known as optically rarer and denser medium?

What is meant by the principle axis? Uses of Concave Mirror Concave mirror are used in torch, search light and head light of the vehicle to obtain a powerful parallel light beam. This will cover all the important concepts that are asked very frequently in the exam. This will make the students feel that this is the one they will need before exams. This will give the exact idea of how to prepare for the exam to score well in the examination. This will help the student make a mind map of the subject and present it well in the examination.

It will give a clear picture of the concepts because all the concepts are in great detail and easily understandable. This will be very useful in the last-minute revision for the exam as it will help you with all the important points and questions. Esters are obtained when an alcoholic is warmed with a carboxylic acid in the presence of conc. Ethyl alcohol is a part of drinking beverages.

It is also used widely as a solvent in industries. To make it unsuitable for drinking certain poisonous substance like pyridine methyl alcohol and copper sulphate are added to it. This is called denatured alcohol. Methylated spirit is ethyl alcohol to Ncert Notes For Class 10th Science Questions which some methyl alcohol is has been added to make it undrinkable. The reaction of an esters to react with an acid or base to give back the alcohol and carboxylic acid is called Saponification.

This is so called because this reaction is used in the preparation of soap. Soap or detergent consist of two part with distinct properties.

One part or end consist of a large hydrocarbon tail which is hydrophobic. When a soap is added to the water it does not form a true solution but is dispersed in a way that the ionic end is in water and the hydrophobic part produce out of water.

Inside water this given rise to the formation of clusters or molecules in which the hydrophobic tails are in the interior of the cluster and the ionic ends are on the surface of the cluster. This formation with a hundred or soap molecules is called a micelle. Soap in the form of micelles is able to clean oil and dirt since it will be collected in the center of the micelle.

When water is agitated the micelle with the oily dirt tend to lift off from the dirty surface and splits into fragments. This give opportunity to other tail to stick to oil if left.

Thus dirt suspended in micelles is easily rinsed away. The structure of synthetic detergent is similar to that of soaps. They have a long hydrocarbon chain which is water repelling and a short ionic part which is water attracting. Thus chemically these they are not different.

Difference lies only in the hydrocarbon part. Synthetic detergent made from long chain hydrocarbon obtained from petroleum whereas hydrocarbon part of soap or vegetable oils. Detergent is being preferred to soap because these form lather even with hard water and have better cleaning action.

Detergents are the sodium salt of a long chain benzene sulphonic acids or a longer chain alkyl hydrogen sulphate. For example, sodium n-dodecyl benzene sulphonate and sodium n-dodecyl sulphate or sodium lauryl sulphate. Synthetic detergents form lather even with hard water and wash clothes well.

Soap 1. It is completely oxidised by bacteria Important Question Of Cbse 10th Class Science Pdf present in sewage and so it does not create any pollution problem in river. Detergents 1. It forms good lather with hard water and thus can be safely used even with hard water. Its excess creates pollution problem in river since it is not fully biodegradable. Advantages of synthetic detergents: i Uses of vegetable oils is minimized.

Dirt is generally absorbed in the clothes as an oily material. It cannot be removed with water because it does not mix well with water. But when a cloth with dirt is soaked in soap solution the dirt and grease attach themselves to the hydrogen component example, C15H31 of the soap molecules.

The �COONa part of the soap which is attached to the water molecules pulls the hydrocarbon part along with dirt away from the surface of cloth thus washing it clean.

These questions provide the complete revision of Chapter 4 Class 10 Science. We have tried to include all the possible questions from the textbooks. Class: 10 Science Chapter 4: Important Questions for What are the product which based on the Versatile of Carbon compound? Explain the formation of Covalent compound: i Chlorine molecules ii Carbon tetra chloride iii Ammonia.

What is meant by double bond or double covalent bond? Give examples. What is triple bond or triple covalent bond? Explain the formation of triple bond giving two examples. Covalent Compound The covalent compound is said to be formed when two atoms achieve stability by the sharing of electron pair, each contributing one electron to the electron pair.

What are the physical properties of carbon compound or covalent compounds? Why are covalent compound generally low melting point? Why are covalent compounds poor conductor of electricity? Why are some elements in molecular form while other are in atomic form? Allotropy in Nature When an element possesses two or more different crystalline forms in the same state they are called allotropes and the phenomenon is known as allotropy. Why do carbon form largest numbers of compounds? Give two reasons.

Differentiate between saturated and unsaturated hydrocarbon giving one example each. Why does only carbon exhibit property of catenation and form large number of compounds with other elements? Write the name of the saturated hydrocarbon having two carbon atom.

Also write its chemical formula. Saturated hydrocarbon having to carbon atom is ethane. Its chemical formula is C2H6. Catenation Property of Carbon The unique property of carbon to form bonds with other carbon atom giving rise to large molecules is called catenation.

Give one example. Write two example each. How are hydrocarbons classified? Name any other elements which like carbon can form compounds which have chains upto seven or eight atoms. How do these compound differ from carbon compound? Write the name of saturated hydrocarbon having 3, 4, 5 and 6 carbon joined in a straight chain? Alkyl Radical The group formed by removal of the hydrogen atom from an alkane molecule is called an alkyl radical or alkyl group.

Write the molecular formula for an i alkene and ii alkyne with four carbon atom. Which of the following compounds can have a triple bond? What are the groups, other than hydrogen part, present in carbon compound called? Functional group. What is meant by the functional group? Give example. Homologous Series A homologous series in a group or family of compounds which contain the same functional group but have different chains lengths thus these have the same chemical properties but different physical properties but different physical properties that vary in a regular manner.

Write the general formula for alkenes and alkynes? What is the difference in the molecular formula of any two adjacent homologous? What is Isomerism? Isomers The compound that contain the same molecular formula but different structures are called structural isomers.

Discuss about the nomenclature of hydrocarbon. What is its common name? Why is the concept of functional group important in inorganic chemistry? Characteristic of Isomers i They have the same molecular formula. How are carboxylic acids named?

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