CBSE Class 10 Science Chapter Wise Important Questions 2023

Today you will get the collection of CBSE class 10 science chapter wise important questions 2023 in detail. 

As you know that science is the subject, which is an important channel of knowledge. 

Today, every country's infrastructure is based on the innovation of science. 

This subject is playing a specific role for the benefit of our society as well as the upliftment of human lifestyle. 

Science is the only subject, which is creating new knowledge and improving education. 

This subject is very much responsible for societal needs and global challenges. 

So, focus on this subject and try to grab more and more scientific knowledge. 

Now come to the point. 

These questions are based on the pattern of CBSE class 10 science previous year question papers.

You will see that several questions are asked again and again in the examination. That means they are repeating. 

This set is the collection of that questions. You should not be totally dependent on these questions for preparation for upcoming examinations. 

These are the CBSE class 10 science sample paper for practice. As you know that practice makes a man perfect. 

Before starting to write the answer to these questions, read the related chapters in the CBSE class 10 science textbook.

Now try to write the answer in your own words, if your concept is clear. 

You see that a decent CBSE class 10 science notes have been ready for revision and practice. 

CBSE Class 10 Chapter Wise Questions Science

CBSE Class 10 Science Chemical Substances-Nature And Behaviour Questions

  • What happens when dilute hydrochloric acid is added to iron filling?
  • Why do diamond and graphite, the two allotropic forms of carbon, evolve different amounts of heat on combustion?
  • Explain, what is the role of oxidizing agent in a reaction?
  • Discuss, what happens chemically when quick lime is added to water?
  • Why is a combustion reaction an oxidation reaction?
  • Explain, why are food particles preferably packed in aluminum foil?
  • Which reactions are used in black-and-white photography?
  • Write short notes on the following:- (a) Combination Reaction (b) Decomposition Reaction (c) Displacement reaction (d) Oxidation reaction
  • Why is respiration considered an exothermic process?
  • On what basis is a chemical equation balanced?
  • Distinguish between an exothermic and an endothermic reaction.
  • Distinguish between a displacement and a double displacement reaction.

CBSE Class 10 Science Acids Bases And Salts Important Questions

  • Arrange these in increasing order of their pH values- NaOH, blood, lemon juice.
  • Name the acid present in the ant sting.
  • What happens when eggshell is added to nitric acid?
  • What is the pH of gastric juices released during digestion?
  • Why does tooth decay start when the pH of the mouth is lower than 5.5?
  • Give Arrhenius a definition of an acid and a base. 
  • Write the chemical formula of washing soda and baking soda. Which one of these two is an ingredient of antacids? How does it provide relief for a stomachache?
  • Which solution is used to dissolve gold?
  • Why does bleaching powder smell strongly of chlorine and does not dissolve completely in water?
  • What is Plaster of Paris? How is it obtained from gypsum?
  • How are bases different from alkalis? Are all bases alkalis?

CBSE Class 10 Science Metals And Non Metals Important Questions

  • A substance X which is an oxide of metal is used intensively in the cement industry. This element is present in bones also. On treatment with water, it forms a solution that turns red and litmus blue. Identify X and also write the chemical reactions involved. 
  • What do you see when magnesium ribbon is burnt? Is magnesium oxidized or reduced in this reaction. 
  • What are amphoteric oxides? Give two examples of amphoteric oxides with balanced chemical equations. 
  • Show the formation of Na2O by the transfer of electrons between the combining atoms. 
  • Why are ionic compounds usually hard?
  • How is it that ionic compounds in the solid state do not conduct electricity and they do so, when in the molten state?
  • What are amphoteric oxides? 
  • Why is it nonmetals do not displace hydrogen from dilute acids?
  • What is conductivity?
  • Name a non-metal which is lustrous and a metal that is liquid at room temperature. 
  • Write one example of each of the following:- (a) A metal and non-metal which are liquid at room temperature. (b) A metal that is very soft and a non-metal which is very hard. (c) A metal that has a very low melting point and a non-metal which has a very high melting point.
  • Describe how sodium and chlorine form sodium chloride? Name the type of bonding shown in the structure. 
  • Explain why the surface of some metals acquires a dull appearance when exposed to air for a long time?
  • Why is sulfide ore converted to its oxide before reduction?
  • Name the anode and cathode used in electrolytic refining of impure copper metal.
  • Why are ionic compounds usually hard? How is it that ionic compounds in the solid state do not conduct electricity but they do so when in the molten state?
  • Why do cesium and gallium melt in our palms?
  • What are ionic compounds?
  • What is the difference between a mineral and an ore?
  • Differentiate between roasting and calcination processes in metallurgy. 
  • What is an alloy? 
  • Explain any two ways to prevent rusting of iron.

CBSE Class 10 Science Carbon And Its Compounds Important Questions

  • List two characteristic features of carbon that when put together give rise to a number of carbon compounds.
  • Write the name and molecular formula of an alkyne having four carbon atoms. 
  • Carbon tetrachloride is not a good conductor of electricity. Give a reason to justify this statement. 
  • Apart from organic beings, where else do, we find carbon. Mention the form in which it is available there and also its percentage. 
  • Write the number of covalent bonds in the molecule of ethane. 
  • Write the name and structure of an alcohol with three carbon atoms in its molecule. 
  • What is the difference in the molecular formula of any two consecutive members of a homologous series of organic compounds?
  • Which type of compounds can be formed by carbon?
  • What is homologous series? Which two of the following organic compounds belong to the same homologous series? CH3, C2H6, C2H6O, C2H6O2, CH4O.
  • Covalent compounds are generally poor conductors of electricity. Explain Why?
  • Name a cyclic unsaturated carbon compound.
  • Catenation is the ability of an atom to form bonds with other atoms of the same element. It is exhibited by both carbon and silicon. Compare the ability of the catenation of the two elements. Give reasons. 
  • What are structural isomers? Why are isomers of the first three members of the alkane series not possible. Write the all possible structure of isomers of the fourth number of this series.

CBSE Class 10 Science Periodic Classification Of Elements Imp Questions

  • What were the limitations of Dobereiner's classification?
  • What were the limitations of Newland's Law of Octaves?
  • What were the criteria used by Mendeleev in creating his periodic table?
  • What is a Halogen?
  • What is Electronegativity?
  • Which of the following gives the correct increasing order of the atomic radii of O, F, and N?
  • The size of a sodium atom is bigger than that of a hydrogen atom. Why?
  • Name the elements which have twice as many electrons in their second shell as in their first shell. Write its electronic configuration also.

CBSE Class 10 Science Life Processes Important Questions

  • Which is the universal source of energy in all cells?
  • What is peristalsis?
  • What is the role of cartilaginous rings on the trachea?
  • What is Lymph? How is it different from blood?
  • Differentiate between saprophytic nutrition and parasitic nutrition based on the type of food and manner of obtaining it.
  • Define transpiration. How does transpiration help in the upward movement of water from roots to leaves?
  • Name the respiratory pigment in human beings? What is its role?
  • What is the sequence of steps in photosynthesis? How is it different in desert plants and in temperate regions?
  • What is the composition of urine? Are glucose and proteins normally present in urine? Why? How is the volume of urine regulated?
  • What is excretion? Name some parts of our body involved in this life process?
  • How are water and minerals absorbed and transported in the plants? 
  • What are the differences between Aerobic and Anaerobic respiration? Name some organisms which use the anaerobic mode of respiration.
  • Explain the importance of the following:- (a) salivary amylase (b) villi (c) pepsin
  • Explain how oxygenated blood from this chamber is sent to all parts of the body.

CBSE Class 10 Science Control And Coordination Important Questions

  • Name two specialized tissues that provide control and coordination in multicellular organisms.
  • What is meant by hydrotropism? Give an example.
  • State how the concentration of auxins stimulates the cells to grow longer on the side of the shoot which is away from the light?
  • Name the hormone which is secreted by the adrenal gland. How does this hormone helps to deal with scary situations?
  • How does chemical coordination occur in plants? Explain with the help of three examples.
  • Write short notes on the following:- Pituitary gland, Pancreas, Adrenal gland, Testes, Oestrogen, and Thyroxine.
  • Which hormone is secreted during emergency situations like anger or excitement? How does it help the human body to handle such situations?
  • Draw a labeled diagram of the human brain. Discuss functions of the cerebrum, cerebellum, and medulla.
  • What is phototropism and geotropism? Labeled diagrams describe an activity to show that light and gravity change the direction in which a plant part grows.
  • Mention the role of each of the following plant hormones: (i) Auxin and (ii) Abscisic acid.

CBSE Class 10 Science How Do Organisms Reproduce Important Questions

  • Name the method by which Spirogyra reproduces under favorable conditions. Is this method sexual or asexual?
  • State the changes that take place in the uterus when - (a) implantation of the embryo has occurred (b) the female gamete/egg is not fertilized.
  • Explain how organisms create an exact copy of themselves.
  • “Variations” are seen in the organisms. State the two main causes of variation.
  • What is the main difference between the sperm and eggs of humans? Write the importance of this difference?
  • “The consistency of DNA copying during reproduction is important for the maintenance of body design features.” Support this statement with two arguments.
  • Define variation in relation to a species. Why is variation beneficial to the species?
  • State one function each performed by the following organs in human beings:- (a) Testes (b) Prostate gland.
  • Write the short notes on the following: - (a) Four modes of asexual reproduction, (b) Fission (c) Budding (d) Spore Formation (e) Fragmentation.
  • What is vegetative propagation? List two advantages and two disadvantages of vegetative propagation.
  • State the basic requirement for sexual reproduction. Write the importance of such reproduction in nature.
  • Write one main difference between the asexual and sexual modes of reproduction. Which species is likely to have comparatively better chances of survival- the one reproducing sexually or the one reproducing asexually? Justify your answer.
  • What are chromosomes? Explain how in sexually reproducing organisms, the number of chromosomes in the progeny is maintained?
  • Explain the structure of the female reproductive system of humans.
  • What is the effect of DNA copying, which is not perfectly accurate, on the reproduction process? How does the amount of DNA remain constant though each new generation is a combination of DNA copies of two individuals? 
  • Differentiate between the following:- (a) Placenta and uterus (b) Unisexual and bisexual flowers (c) Fertilization and germination.

CBSE Class 10 Science Heredity And Evolution Important Questions

  • A Mendelian experiment consisted of breeding pea plants bearing violet flowers with pea plants bearing white flowers. What will be the result in Fj progeny?
  • What are fossils? What is their significance in the study of evolution? 
  • What is the genetic constitution of human sperm? Mention the chromosomes pair present in the zygote determining the sex of a male child.
  • Where are the genes located? What is the chemical nature of genes?
  • What are sex chromosomes? Which sex chromosomes are found in male and female human beings? State the chromosome responsible for the development of the male child in human beings?
  • What is the importance of DNA copying in reproduction? Why is variation beneficial to the species but not necessary for the individual? Explain.
  • Discuss the role of variations in evolution. What are natural selection and genetic drift?
  • Explain the following:- (a) Speciation (b) Natural Selection
  • “Two areas of study namely evolution and classification are interlinked”. Justify this statement.
  • Explain with an example for each, how the following provides evidence in favor of evolution in organisms:- (a) Homologous organs (b) Analogous organs (c) Fossils 
  • Variation is useful for the user over a long time. But the variants have unequal chances of survival. Explain this statement.
  • How green beetles had the color advantage over red beetles? Explain.

CBSE Class 10 Science Light Reflection And Refraction Important Questions

  • Write short notes on the following:- Concave mirror, convex mirror, concave lens, convex lens
  • An object of size 7.0 cm is placed at 27 cm in front of a concave mirror of a focal length of 18 cm. At what distance from the mirror should a screen be placed so that a sharply focused image can be obtained?
  • When sun rays are focussed with a convex lens, a sharp, bright spot is observed at its focus. What does this spot indicate?
  • The image formed by a concave mirror is observed to be virtual, erect, and larger than the object. Where should be the position of the object?
  • What is the frequency of the red color of wavelength 8000 Ac?
  • A concave mirror produces three times magnified (enlarged) real image of an object placed 10 cm in front of it. Where is the image located?

CBSE Class 10 Science Human Eye And Colourful World Important Questions

  • When white light passes through the achromatic combination of prisms, then what is observed?
  • How will you use two identical prisms so that a narrow beam of white light incident on one prism emerges out of the second prism as white light? 
  • Define the term power of accommodation. Write the modification in the curvature of the eye lens which enables us to see the nearby objects clearly?
  • What is myopia (near-sightedness)? Draw a ray diagram to show how it can be corrected using a lens. 
  • What is hypermetropia (far-sightedness)? Draw a ray diagram to show how this defect can be corrected using a lens.
  • Define the term dispersion of white light. State the color which bends (i) the least and (ii) the most while passing through a glass prism.
  • What is meant by the spectrum of white light? How can we recombine the components of white light after a prism has separated them? Draw a diagram to illustrate it.
  • Write short notes on the following:- (a) Dispersion of light (b) Scattering of light (c) Total internal reflection of light (d) Reflection of light from the earth
  • Explain why do the planets not twinkle but the stars twinkle?
  • What is meant by the least distance of distinct vision? How does this vary between very young and old people?
  • What is a spectrum? Why do different colored rays deviate differently on passing through a glass prism? 
  • What is meant by the power of accommodation of an eye?
  • What is meant by the scattering of light?
  • Explain the following terms used in relation to defects in vision and correction provided by them:- (i) Myopia (ii) Astigmatism (iii) Bifocal lenses (iv) Farsightedness.

CBSE Class 10 Science Electricity Important Questions

  • What happens to the resistance of a conductor when the temperature is increased?
  • Name the device/instrument used to measure the potential difference. How is it connected to an electric circuit?
  • Draw the symbols of battery and rheostat.
  • What is the resistance of an ideal voltmeter?
  • A large number of free electrons are present in metals yet no current flow in the absence of electric potential across it. Explain the statement with reason.
  • Why do the wires connecting an electric heater to the mains not glow while its heating element does?
  • State the factors on which the resistance of a cylindrical conductor depends. How will the resistance of a conductor change if it is stretched so that its length is doubled?
  • What material is used in making the filament of an electric bulb? Name the characteristics which make it suitable for this.
  • An electric bulb draws a current of 0.2 A when the voltage is 220 volts. Calculate the amount of charge flowing through it in one hour.
  • V-I graphs for two wires A and B are shown in the figure. If both the wires are made of the same material and are of equal thickness, which of the two is of more length? Give justification for your answer.
  • Electric current flows through three lamps when arranged in (a) a series and (b) a parallel. If the filament of one lamp breaks. Explain what happens to the other two lamps in both cases.
  • Two bulbs A and B are rated as 90W–120V and 60W–120V respectively. They are connected in parallel across a 120V source. Find the current in each bulb.
  • Which bulb will consume more energy?

CBSE Class 10 Science Magnetic Effect Of Electric Current Important Questions

  • Mention the shape of the magnetic field lines around a current-carrying straight conductor.
  • State the observation made by Oersted on the basis of his experiment with current-carrying conductors.
  • State the rule which you use to find the direction of induced current or state Fleming’s right-hand rule.
  • When is the force experienced by a current-carrying conductor placed in a magnetic field the maximum?
  • An alternating electric current has a frequency of 50 Hz. How many times does it change its direction in one second?
  • Draw the patterns of magnetic field fines due to a bar magnet. The magnetic field lines are closed curves. Why? 
  • On what factors does the force experienced by a current-carrying conductor placed in a uniform magnetic field depend?
  • Draw the pattern of lines of force due to a magnetic field associated with a current-carrying conductor. State how the magnetic field produced changes (a) with an increase in current in the conductor and (b) the distance from the conductor.
  • Why does a current-carrying Conductor experiences a force when it is placed in a magnetic field? State Fleming’s left-hand rule.
  • Explain:- (a ) State Fleming’s left-hand rule. (b) Write the principle of working of an electric motor. (c) Explain the function of the following parts of an electric motor - (i) Armature, (ii) Brushes, (iii) Split ring
  • A uniform magnetic field is directed vertically upwards. In which direction in this field should an a-particle (which are positively charged particles) be projected so that it is deflected southward? Name and state the rule you have used to find the direction in this case.
  • What is meant by electromagnetic induction? State the rule which helps in determining the direction of induced current.

CBSE Class 10 Science Sources Of Energy Important Questions

  • What sector of the Indian economy consumes most of the nation’s petroleum?
  • Write short notes on the following:- (a) photovoltaic cells (b) solar cookers (c) solar concentrators (d) green plants
  • Write short notes on the following:- (a) Acid rain (b) Greenhouse effect (c) Destruction of wildlife habitat (d) Air pollution
  • Write the name of the substance whose vapors are used to run the turbine of the generator of the ocean thermal energy plant.
  • Define fuel. List any two characteristics that you would look for in a good fuel.
  • State any three reasons to justify that LPG is considered an ideal fuel.
  • Biogas is an excellent fuel. Justify the statement by giving two reasons. Mention the main constituents of biogas along with its percentage.
  • How does the construction of dams across the river get linked with the production of greenhouse gases?
  • What happens when the wood is burnt in a limited supply of oxygen? Name the residue left behind after the reaction and state two advantages of using this residue as a fuel over wood.
  • Name four gases commonly present in biogas. State two advantages of using this gas over fossil fuels.
  • Describe how hydro energy can be converted into electrical energy. Write any two limitations of hydro energy.

CBSE Class 10 Science Our Environment Important Questions

  • Define ‘trophic level’.
  • Which compounds are responsible for the depletion of the ozone layer? 
  • What is the important function of the presence of ozone in the earth’s atmosphere?
  • In a food chain, 10,000 joules of energy are available to the producer. How much energy will be available to the secondary consumer to transfer to the tertiary consumer? 
  • List two man-made ecosystems.
  • Which of the following belongs to the first trophic level of a food chain? Grass, Grasshopper, Plants, Rat, Tiger.
  • How is ozone formed in the upper atmosphere? Why is the damage to the ozone layer a cause of concern to us? State the cause of this damage. 
  • What are biodegradable and non-biodegradable substances? Select two biodegradable pollutants from the following: Agricultural waste, glass, plastic, sewage, and DDT.
  • A non-biodegradable toxic chemical has entered the food chain. Which type of food habit will you suggest to a man, vegetarian or non-vegetarian? Explain with the help of a food chain. The food chain which you would suggest is advantageous in another aspect. How?
  • What is meant by biodiversity? List two advantages of conserving forests and wildlife.
  • What is ‘environmental pollution’? Distinguish between biodegradable and non-biodegradable pollutants.

CBSE Class 10 Science Biology Management Of Natural Resources Important Questions

  • Why is mining a big source of pollution?
  • Write two points to be kept in mind while storing water in tanks.
  • Write any two alternatives to dams.
  • How did ’Chipko Andolan’ ultimately benefit the local population?
  • What will be the result of the presence of an excess amount of CO2 in the environment?
  • Which is the easiest method to detect water pollution?
  • A person lives near a forest. Enlist 4 items that he can get from forests to meet his daily needs.
  • Why do you think there should be equitable distribution of resources?
  • Which canal has brought greenery to considerable areas of Rajasthan?
  • What were the two main problems as a result of the Tawa Irrigation Project?
  • Write the advantages of giving control of water management to the residents of the area?
  • State benefits of water harvesting.
  • Name a bacteria found in the human intestine?
  • Which is the easiest method to detect water pollution?
  • Why are forests called “biodiversity hot spots”?

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Rajesh Deepak
My name is Rajesh Deepak. I am working in a Private Organization. I started this blog to provide good exam materials for students, who are preparing for the upcoming examinations.