CBSE Class 10 Science 2026
314 questions · 652 marks · 312 with the board’s own marking-scheme answer so far.
What 2026 actually asked, chapter by chapter
Marks we counted in the 2026 papers themselves. CBSE allocates marks per unit, not per chapter — this is what was observed, not an official CBSE weightage.
| Chapter | Marks | Share |
|---|---|---|
| Electricity22 questions | 71 | 10.9% |
| Life Processes41 questions | 70 | 10.7% |
| Chemical Reactions and Equations29 questions | 67 | 10.3% |
| Light - Reflection and Refraction26 questions | 63 | 9.7% |
| Magnetic Effects of Electric Current15 questions | 53 | 8.1% |
| Carbon and its Compounds22 questions | 48 | 7.4% |
| Metals and Non-metals22 questions | 44 | 6.7% |
| How do Organisms Reproduce?24 questions | 43 | 6.6% |
| Acids, Bases and Salts27 questions | 41 | 6.3% |
| Our Environment25 questions | 37 | 5.7% |
| The Human Eye and the Colourful World18 questions | 36 | 5.5% |
| Heredity13 questions | 31 | 4.8% |
| Control and Coordination17 questions | 30 | 4.6% |
All 314 questions from 2026
- Q1Which structure in a leaf is mainly responsible for gaseous exchange?1 mkasked 3×
- Q1Pravin was given a list of characteristics associated with the process of anaerobic respiration in humans, in the table…1 mkasked 2×
- Q1Identify the part that controls the closing and opening of the stomatal pore in leaves of plants. Select the correct…1 mkasked 3×
- Q1Choose the correct statements with reference to chromosomes: (i) carry hereditary information from parents to next…1 mk
- Q1The genotype of green stemmed tomato plant is denoted by 'GG' and that of purple stemmed tomato plant as 'gg'. Hybrid…1 mkasked 3×
- Q1Observe the given figure and select the statement that correctly states how these fungi obtain nutrition.1 mkasked 2×
- Q2Observe the figure given below and identify the incorrect step for the activity set-up:1 mkasked 3×
- Q2Yeast multiplies by which of the following methods?1 mk
- Q2Identify the endocrine gland that regulates the growth of human body.1 mk
- Q2Identify the type of tropic movement that is responsible for the movement of the pollen tube towards an ovule from the…1 mkasked 3×
- Q2Identify the type of reproduction shown in the diagram given below:1 mk
- Q2If the part 'P' of the flower is removed, which of the following processes will not take place?1 mkasked 3×
- Q3Given below are some of the statements regarding our environment: (i) Change in our life-styles have resulted in…1 mkasked 3×
- Q3Spirogyra, despite being a multi-cellular organism, still shows a simple reproductive method. Select the correct option…1 mkasked 3×
- Q3Walking in a straight line and riding a bicycle are activities which are possible due to coordination of which part of…1 mk
- Q3Choose the equation of reaction that correctly represents anaerobic respiration in muscles:1 mkasked 3×
- Q3An ecosystem contains maximum number of:1 mk
- Q3Identify the correct statement for spirogyra, leishmania and hydra:1 mkasked 3×
- Q3A farmer wants to grow banana plants genetically similar to the plants already available in the fields. Which of the…1 mk
- Q4Identify the traits that cannot be transmitted from parents to the off- springs: (i) Swimming technique (ii) Blood…1 mk
- Q4Four chambered heart is a characteristic of:1 mk
- Q4Human brain has various parts or regions that help in different actions, responses and coordination. From the…1 mkasked 2×
- Q4If the stomatal pore is open, it indicates which situation from the following?1 mk
- Q4In human beings, the implantation of fertilised egg takes place in which part of female reproductive system?1 mkasked 3×
- Q4The carbohydrates, which are not used immediately in plants, are stored in the form of 'a', which serves as an internal…1 mkasked 2×
- Q4From the given situations, identify 'Chemotropic' and 'Geotropic' movements in parts of plants, respectively: (i)…1 mk
- Q4In a synapse, the chemical signal is transmitted from:1 mkasked 2×
- Q5When a human egg is fertilized by a sperm having 'Y' chromosome, the zygote has the following combination of…1 mkasked 3×
- Q5Select the option that represents the correct balanced equation for the process of photosynthesis:1 mk
- Q5Organisms of a higher trophic level which feed on several types of organisms belonging to a lower trophic level form…1 mkasked 3×
- Q5Pancreas secretes pancreatic juice which contain certain enzyme that helps in digestion of food. Choose the correct…1 mkasked 3×
- Q5Select the incorrect statement from the following:1 mk
- Q5The following events occur during the process of photosynthesis. Choose the option that indicates the correct events.…1 mkasked 2×
- Q5Following are the statements about the different parts of the brain. Select the correct statements. (i) The thinking…1 mkasked 2×
- Q5Translocation is the process in which plants deliver:1 mk
- Q6Two pea plants, one with round green seeds (RRyy) and another with wrinkled yellow (rrYY) seeds were crossed with each…1 mkasked 3×
- Q6In accumulation of toxic substances at higher trophic levels of an ecosystem through the food chain, which of the…1 mkasked 3×
- Q6Sex is determined by different factors in various species. However, in human beings, it is determined genetically.…1 mk
- Q6In terms of various trophic levels of a food chain, which of the following organisms belong to the same level?1 mk
- Q6In the given figure, identify the trophic level having maximum concentration of harmful chemicals.1 mkasked 3×
- Q6Study the given diagram of the heart, with blood vessels marked '1' and '2'. From the following statements, establish…1 mk
- Q6Which of the following represents the correct sequence of events of sexual reproduction in a flower?1 mk
- Q6In plants, the role of cytokinin is to/in:1 mk
- Q6Which of the following is a non-biodegradable pollutant?1 mkasked 3×
- Q7The number of chromosomes in parents and offspring of a particular species undergoing sexual reproduction remains…1 mk
- Q7The reasons for excessive generation of wastes are: (i) Use and throw policy. (ii) Increased availability of packaged…1 mk
- Q7Which of the following group is not 'biodegradable'?1 mkasked 3×
- Q7In human beings the oxygen rich blood is pumped out to the body by:1 mkasked 3×
- Q7Opening of stomata is regulated by:1 mk
- Q7The sexually transmitted disease caused by bacteria is:1 mk
- Q7In an ecosystem, the decomposers perform an important role. Select the option indicating the role of decomposers.1 mk
- Q7The growth of tendrils in grapes plants is due to:1 mkasked 3×
- Q7Which of the following limits the number of trophic levels in a food chain?1 mkasked 3×
- Q7Plants use variety of techniques to get rid of their waste materials. Some are mentioned below. Identify the incorrect…1 mk
- Q8Assertion: Reflex actions do not involve thinking. Reason (R): Most reflex actions are controlled by the spinal cord.1 mkasked 2×
- Q8Assertion: Arteries have valves as they have to withstand high pressure. Reason (R): Arteries are vessels which carry…1 mk
- Q8Assertion: Natural replenishment of soil will not take place in absence of microbes. Reason (R): Microbes, comprising…1 mkasked 2×
- Q8Assertion: Blood plasma transports carbon dioxide in dissolved form, while oxygen is transported by respiratory…1 mkasked 3×
- Q8Assertion: Bacteria that can withstand heat have better chances of survival in a heat wave. Reason (R): Accumulation of…1 mkasked 2×
- Q8Assertion: Variations are not often seen in off-springs produced by asexual reproduction. Reason (R): DNA molecule…1 mkasked 2×
- Q9Assertion: Ozone (O 3) gas at higher levels of atmosphere is a product of UV radiation acting on Oxygen (O 2). Reason…1 mk
- Q9Assertion: The basic filtration unit in the kidneys, like in the lungs, is a cluster of very thin-walled blood…1 mkasked 2×
- Q9Assertion: In case of iodine deficiency in our diet, there is a possibility that we might suffer from goitre. Reason…1 mk
- Q9Assertion: Plants have hormones that do not control directional growth. Reason (R): Abscisic acid inhibits growth.1 mk
- Q9Assertion: The peristaltic movements occur all along the gut. Reason (R): The lining of the gut has muscles that…1 mkasked 2×
- Q9Assertion: Ozone at higher levels of atmosphere is a product of UV radiation acting on oxygen molecule. Reason (R): The…1 mk
- Q9Assertion: There are generally a greater number of individuals at the lower trophic levels of an ecosystem. Reason (R):…1 mkasked 3×
- Q9Assertion: Reproduction, like any other life process, is essential to maintain the life of an individual organism.…1 mk
- Q9Assertion: In human beings, the respiratory pigment is haemoglobin present in red blood cells. Reason (R): Haemoglobin…1 mkasked 2×
- Q9Assertion: Highest percentage of pesticides is found in tertiary consumers in a food chain. Reason (R): Chemicals /…1 mkasked 3×
- Q9Assertion: Bacteria produced as a result of asexual reproduction would be similar. Reason (R): There would be only…1 mk
- Q10"The timing and the amount of hormone secreted by a gland are regulated in the human body." Justify this statement with…2 mkasked 3×
- Q10What are decomposers? List two important roles they play in the environment.2 mk
- Q10(i) Chlorofluorocarbons (CFCs) have been linked to depletion of ozone layer. In 1987, the United Nations Environment…2 mkasked 2×
- Q10What are hormones? State any one function of the following hormones: (i) Insulin (ii) Adrenaline2 mk
- Q10Give a diagrammatic representation of nutrition in Amoeba.2 mk
- Q10What is the function of diaphragm in human respiratory system? Where is it present in human body?2 mk
- Q10Why is bile juice considered to be very important for digestion, even though it doesn't contain any digestive enzymes?…2 mk
- Q10"Transpiration in plants is a necessary evil." Comment on the statement giving two reasons.2 mkasked 2×
- Q11Explain why food chains generally consist of three or four steps.2 mk
- Q11"Variation is useful for the survival of species over time." Explain this statement with the help of an example.2 mk
- Q11What kind of respiration provides more energy and why?2 mkasked 3×
- Q11The leaves of a plant first prepares food 'P' by photo-synthesis. Food 'P' is then converted to food 'Q', which is…2 mk
- Q11Why the lungs always contain a residual volume of air?2 mk
- Q11A squirrel in a scary situation requires its body to prepare for either 'fight or flight' to save itself. State the…2 mk
- Q11Do all variations in a species have equal chances of surviving in the environment in which they find themselves?…2 mkasked 2×
- Q11State two differences between the act of chewing food and salivation on sight of food. OR State two differences between…2 mkasked 3×
- Q11Observe the given figure and identify the labelled parts P, Q, R and S: OR Which of the plant hormones are responsible…2 mkasked 3×
- Q12Suggest one best way to dispose of the following wastes: (i) Kitchen waste (ii) Metallic waste (iii) Plastic bottles…2 mk
- Q12In the following food chain, 5 J of energy is available to man. Calculate, how much energy was available at the…2 mk
- Q12Explain the role of UV radiation in the formation of ozone layer. Why is UV radiation considered as highly damaging to…2 mk
- Q12Suggest two ways of dealing with waste generated at home.2 mk
- Q12Draw a neat diagram to show germination of pollen on the female reproductive part of the flower. Name and label only…2 mkasked 2×
- Q12Varun is diabetic. His latest ultrasound reports showed a blockage in his pancreatic duct. How will this affect the…2 mkasked 3×
- Q12Separation of right side and left side of the heart is useful to keep oxygenated and deoxygenated blood from mixing.…2 mkasked 2×
- Q12Suggest one precaution to be taken before disposing of the following: Sewage from homes Industrial wastes2 mk
- Q12Given below is a diagrammatic representation of cross-section of a leaf: (i) Identify 'P' in the given diagram and…2 mk
- Q12Give differences between the following: Sensory nerve and motor nerve Consumers and decomposers2 mk
- Q12Briefly mention the steps in double-circulation through human heart.2 mkasked 3×
- Q13Give reasons for the following: Adrenal gland is known as the stress gland of the body. Prenatal sex determination is…3 mkasked 2×
- Q13Observe the following diagrams: Case P Case Q Case R What change will be observed in Cases 'P', 'Q' and 'R'? Give…3 mk
- Q13Use the following information for Pea plants: Dominant allele for tall plants - T Recessive allele for short plants - t…3 mk
- Q13A couple are parents to 4 daughters in a sequence, and do not have any son. Does this indicate that the husband does…3 mk
- Q13Given below is a pyramid showing various trophic levels in an ecosystem: From the organisms listed below, identify…3 mkasked 3×
- Q13In xylem tissue, vessels and tracheids of the roots, stems and leaves are interconnected to form a continuous system of…3 mkasked 2×
- Q13Draw a neat diagram of the human respiratory system and label its lungs, trachea, bronchi and alveoli. State the roles…3 mk
- Q13Complete the pathways given below, showing the breakdown of glucose. Identify 'A', 'B', 'C', 'D', 'E' and 'F'.3 mk
- Q13A blue colour flower (BB) bearing plant is crossed with a plant with white coloured flowers (bb). State the colour of…3 mk
- Q13Based on Mendel's experiment show the cross between round, yellow seeds of pea plant (RRYY) with wrinkled and green…3 mk
- Q14Give differences between the following: Nephron and neuron Sensory nerve and motor nerve Consumers and decomposers3 mkasked 2×
- Q14Study the given table and answer the following questions: Depict the information given in the table in the form of a…3 mkasked 2×
- Q14Mention any one harmful effect of using plastic bags on the environment. Suggest better alternatives to the usage of…3 mkasked 3×
- Q14Show the cross and observations made by Mendel when he crossed pure tall pea plant with a pure short pea plant to get F…3 mkasked 2×
- Q14Give reasons for the following: Plants do not have an excretory system so how they excrete their wastes? Why do mammals…3 mk
- Q14Giving two examples, justify the statement that the sex of the offspring in all animals is not always genetically…3 mkasked 3×
- Q14Give reasons for the following: 3 × 1=3 Herbivores have a longer small intestine. Inner lining of small intestine has…3 mk
- Q14Show a cross between a pea plant having round \& green seed with a pea plant having wrinkled and yellow seeds upto F 2…3 mk
- Q14Mention the gland and the hormone secreted by it in scary situation in human beings. Write two responses that enable…3 mk
- Q15Kidneys help to regulate the volume of fluid and various metabolites waste products in the body. Normally, kidney…4 mkasked 3×
- Q15Read the following passage and answer the questions that follow: A middle-aged person is facing some cognitive changes…4 mkasked 3×
- Q15Plants exhibit movements in response to various environmental stimuli to adopt and survive in their surroundings. These…4 mkasked 3×
- Q15Read the following passage and answer the questions that follow: Not all plants carry out photosynthesis by the same…4 mkasked 3×
- Q15Mendel took garden pea plants with different characteristics, such as height to study the inheritance pattern of…4 mkasked 3×
- Q16Attempt either or: Observe the given diagram and answer the questions that follow: (i) Give the name of the structure…5 mkasked 3×
- Q16Given below are certain situations. Analyse each and describe its possible impact: (i) A population of bacteria living…5 mkasked 3×
- Q16Attempt either or: (i) Name an organ that helps in the formation of male germ cells in humans and also mention the…5 mkasked 3×
- Q16(i) In an angiospermic flower, fertilization is said to take place when male gametes carried in the pollen tube fuse…5 mkasked 3×
- Q16Draw a labelled diagram showing open and closed stomatal pore. List the main events that occur during the process of…5 mkasked 3×
- Q17The volume ratio of hydrogen and oxygen gases liberated during electrolysis of water is1 mkasked 2×
- Q17Which of the following is an example of a displacement reaction?1 mkasked 3×
- Q17Tomato is a natural source of which acid?1 mk
- Q17Which of the following are combination reactions? (i) 2 KClO 3 → 2 KCl+3 O 2 (ii) MgO+H 2 O → Mg(OH) 2 (iii) 4 Al+3 O 2…1 mkasked 2×
- Q17When lead nitrate is heated in a boiling tube, we observe:1 mk
- Q17(i) AgNO 3+NaCl → NaNO 3+AgCl (ii) K 2 SO 4+BaCl 2 → BaSO 4+2 KCl Which of the following options clearly describes both…1 mkasked 3×
- Q17Tamarind is a natural source of which acid?1 mk
- Q17The volume ratio of hydrogen and oxygen gases liberated during electrolysis of water is:1 mkasked 2×
- Q18Rain water is called 'acid rain' when its:1 mk
- Q18C 6 H 12 O 6(aq)+6 O 2( g) → 6 CO 2( g)+6 H 2 O (l). The above reaction is an example of -1 mkasked 3×
- Q18Which of the following compounds is used for removing permanent hardness of water?1 mk
- Q18To a small amount of copper oxide in a beaker, when we add dilute hydrochloric acid slowly with stirring, the change in…1 mkasked 3×
- Q18Which one of the following can be used as an acid-base indicator by a visually impaired (blind) student?1 mkasked 3×
- Q18Which of the following set of compounds does not belong to same homologous series?1 mkasked 3×
- Q18A metal carbonate reacts with a solution X which forms a salt, water and a gas Y. What are X and Y?1 mkasked 3×
- Q19An aqueous solution turns red litmus blue. Excess addition of which of the following solution would reverse the change?1 mkasked 3×
- Q19In the following diagram, if acetic acid of same concentration is taken in place of dilute sulphuric acid, then1 mk
- Q19In the following equation x KI+H 2 O 2 → I 2+y KOH x and y respectively are:1 mkasked 3×
- Q19When ferrous sulphate crystals are heated in a test tube, we observe that:1 mkasked 3×
- Q19Which of the following is an amphoteric oxide?1 mkasked 3×
- Q19Magnesium ribbon burns with a dazzling white flame and changes into a white powder as shown in the diagram given below:…1 mk
- Q19Which of the following are decomposition reactions? (i) 2 KClO 3 → 2 KCl+3 O 2 (ii) MgO+H 2 O → Mg(OH) 2 (iii) 2 H 2 O…1 mk
- Q19The gases evolved on heating lead (II) nitrate crystals are:1 mkasked 3×
- Q20Which of the following compounds will undergo addition reaction?1 mk
- Q20The hydrocarbons with general formula C n H 2 n represents:1 mk
- Q20Consider the structures 'X' and 'Y' given below: and Which of the following statements are correct? (i) 'X' and 'Y' are…1 mk
- Q20When Mg metal is treated with hot water, it starts floating on the surface of the water. The reason for its different…1 mkasked 3×
- Q20The formula of functional group for aldehyde is:1 mk
- Q20Which of the following functional group is for carboxylic acid?1 mk
- Q20Which of the following compounds does not undergo addition reaction?1 mk
- Q20While washing dirty clothes by soap, micelles are formed. Select the correct statement about micelles.1 mkasked 3×
- Q20Study the following table and select the correct option:1 mkasked 3×
- Q21Which one of the following metals does not react with cold water?1 mkasked 2×
- Q21The reaction of calcium with cold water is:1 mkasked 3×
- Q21Which of the following will not undergo addition reaction?1 mkasked 3×
- Q21Which one of the following metals neither reacts with cold water nor reacts with hot water but reacts with steam?1 mk
- Q21The pH of the gastric juices released during digestion is:1 mk
- Q21Which of the following is a poor conductor of electricity?1 mkasked 3×
- Q22Solder is an alloy of1 mk
- Q22In which case/cases will the bulb glow considering that all other connections of electric circuit are complete and…1 mkasked 3×
- Q22Alloys are homogeneous mixture of metal with a metal or non-metal. Which among the following alloys contain non-metal…1 mkasked 2×
- Q22The natural sources of oxalic acid, lactic acid and methanoic acid respectively are:1 mkasked 3×
- Q22Baking powder is a mixture of:1 mk
- Q22Four solutions, namely fructose, ethanol, hydrochloric acid and sodium hydroxide filled in four separate beakers are…1 mkasked 2×
- Q23Galvanization is a process of coating iron articles with a thin layer of zinc to prevent iron from rusting. The iron is…1 mk
- Q23On reaction with dilute HCl, which of the following pair of metals will evolve hydrogen gas?1 mk
- Q23When zinc reacts with NaOH, the product formed is:1 mkasked 3×
- Q23Which gas is evolved when magnesium metal reacts with very dilute HNO 3?1 mk
- Q23When an element 'X' reacts with water, it starts floating. Identify the element 'X':1 mkasked 3×
- Q23A student notices that her silver jewellery turned dull and had a grey-black coating over it after wearing for a few…1 mkasked 3×
- Q23Which one of the following chemicals is used in soda-acid fire- extinguishers?1 mk
- Q23How will you protect yourself from the heat generated while diluting a concentrated acid?1 mkasked 2×
- Q24Assertion: Carbon shows the property of catenation. Reason (R): C - C bond is weak due to its small size.1 mk
- Q24In the question two statements are given - one labelled as Assertion and other labelled as Reason (R). Answer this…1 mkasked 3×
- Q24Assertion: Carbon compounds can form chains, branched and ring structures. Reason (R): Carbon exhibits the property of…1 mk
- Q24Assertion: Carbon shows the property of catenation. Reason (R): This is due to strong C - C bond.1 mk
- Q24Assertion: There are large number of compounds with many carbon atoms linked to each other. Reason (R): Carbon-Carbon…1 mkasked 3×
- Q24Assertion: Carbon shares its valence electrons with other atoms of carbon or with atoms of other elements. Reason (R):…1 mkasked 3×
- Q24In the question, two statements are given - One labelled as Assertion and other labelled as Reason (R). Write the…1 mkasked 3×
- Q25Define the following terms: (i) Olfactory indicator (ii) Water of crystallization2 mk
- Q25How is a universal indicator obtained? How is the wide range of pH of solution tested by it?2 mk
- Q25Read the following passage and answer the questions that follow: One student was comparing the reactivity of different…2 mk
- Q25Why does one feels pain and irritation when stung by honey-bee? Rubbing of baking soda on the stung area gives relief.…2 mk
- Q25Write balanced equations for the reactions of the following: 2 × 1=2 Iron with steam Calcium with water2 mk
- Q25Answer the following: Why should chemical equations be balanced? Name the oxidising and reducing agent in the following…2 mk
- Q25How is tooth decay related to pH? How can it be prevented?2 mk
- Q25Show the formation of NaCl by transfer of electrons. Why does solid NaCl not conduct electricity? [Atomic number:…2 mk
- Q25A compound 'A' is used in soda-lime fire-extinguisher and decomposes on heating to form compound 'B'. Compound 'B' is…2 mk
- Q25Write the preparation of Baking soda. How does it help in making cakes soft and spongy?2 mk
- Q25Comment on the following properties of ionic compounds and give reason in support of your answer: (i) Physical nature…2 mk
- Q25Write the balanced chemical equation for the preparation of: Sodium hydroxide by electrolysis of brine solution Sodium…2 mk
- Q25Write the balanced chemical equations involved in the preparation of Bleaching powder Baking soda2 mk
- Q25Show the formation of the following ionic compounds by transfer of electrons between the combining atoms: (i) Sodium…2 mk
- Q25What are amphoteric oxides? Categorise the following based on their nature: ZnO, Na 2 O, CO 22 mk
- Q26Attempt either or: (i) Write one example each of one metal that is so soft that it can be cut with a knife, and one…3 mkasked 3×
- Q26Name the substance oxidised and reduced in the following reaction: ZnO+C → Zn+CO Balance the following chemical…3 mk
- Q26Define the following terms: 3 × 1=3 (i) Corrosion (ii) Rancidity (iii) Exothermic reaction3 mk
- Q26What happens when (i) potassium iodide solution is added to lead (II) nitrate solution? (ii) zinc is added to copper…3 mk
- Q26Answer the following: 3 × 1=3 Why can the oxides of highly reactive metals not be reduced by carbon? Why do ionic…3 mk
- Q26Answer the following: Identify the substance oxidized and the substance reduced in the following reaction: 4 Na+O 2 → 2…3 mk
- Q26Account for the following: White silver chloride turns grey when exposed to sunlight. Lead (II) nitrate on heating…3 mk
- Q26What happens when (i) lead (II) nitrate is heated? (ii) iron (II) sulphate is heated? (iii) silver chloride is exposed…3 mk
- Q26What happens when (i) Calcium carbonate is heated? (ii) Silver bromide is exposed to sunlight? (iii) Lead is added to…3 mk
- Q262 g of green coloured crystals of ferrous sulphate are heated in a dry boiling tube. Name the type of chemical reaction…3 mk
- Q26What happens when: An iron nail is dipped in copper (II) sulphate solution? Potassium iodide solution is mixed with…3 mk
- Q26Give reasons: 3 × 1=3 (i) Potato chips manufacturers fill the packet of chips with nitrogen gas. (ii) Respiration is an…3 mk
- Q27Translate the following statements into chemical equation and then balance them: Water is added to quicklime Burning of…3 mk
- Q27Explain chlor-alkali process with chemical equation. Name the products formed at anode and cathode. OR Write the…3 mkasked 3×
- Q27Seema took a small amount of copper powder in a china dish and heated it. What changes will she observe on heating?…3 mk
- Q27Attempt either option or. (i) Which method will be used to convert each of them to their respective metal oxides?…3 mkasked 3×
- Q27Answer the following: 3 × 1=3 Write two observations when green coloured crystals of ferrous sulphate are heated in a…3 mk
- Q27Define the following terms: 3 × 1=3 Corrosion Rancidity Double displacement reaction3 mk
- Q27Attempt either or: Give reasons: 3 × 1=3 (i) For dilution of an acid, acid is added into water and not water into acid.…3 mkasked 3×
- Q27Give the chemical name and formula of Plaster of Paris. Write the chemical equation of its preparation. Give any two…3 mkasked 3×
- Q28Read the following passage and answer the questions given below: Most of metals occur in combined state in form of…4 mkasked 3×
- Q28The pH plays an important role in our daily life. Strength of acids and bases depends on the number of H^+ ions and…4 mkasked 3×
- Q28Read the following passage and answer the questions that follow: In the given diagram, when electricity is passed…4 mkasked 3×
- Q28Alcohol forms a homologous series with general formula C n H 2 n+1-OH and -OH group as functional group. Ethanol is…4 mkasked 3×
- Q28Read the following passage and answer the questions that follow: An electrochemical process is used for refining metals…4 mkasked 3×
- Q29(i) Give reasons for the following: (I) Covalent compounds are poor conductor of electricity. (II) Soap does not form…5 mkasked 3×
- Q29Attempt either option or: (i) Carbon cannot form C^4+ cation and C^4- anion. Explain. (ii) Define homologous series of…5 mkasked 2×
- Q29Attempt either or: (i) What is homologous series? Which two of the following organic compounds belong to the same…5 mkasked 3×
- Q29Attempt either option or: (i) Carbon cannot form C^4+ cation and C^4- anion. Explain. (ii) Define homologous series of…5 mk
- Q29Attempt either option or: (i) Give reasons for the following: (I) Ionic compound have generally high melting points and…5 mkasked 3×
- Q29Attempt either or: A carbon compound 'P' of molecular formula C 2 H 6 O is found to be neutral when tested with red and…5 mkasked 3×
- Q30The correct way to connect an ammeter and a voltmeter in an electric circuit is:1 mkasked 2×
- Q30A convex lens of focal length 15 cm, is forming a real image. If the size of image is same as the size of object, then…1 mkasked 3×
- Q30Rays from the sun converge at a point 25 cm behind a convex lens. The distance at which an object be placed in front of…1 mkasked 3×
- Q30The pair of eye parts responsible for admitting different amount of light in to the eyes is1 mkasked 3×
- Q30From the following options choose the one which gives negative magnification greater than one:1 mkasked 3×
- Q31Vision defect far-sightedness is found in the eye defects named as:1 mk
- Q31To restore clear vision in persons whose size of the eye ball has reduced, he/she is suggested to use suitable1 mkasked 3×
- Q31In an electric circuit carrying current I, a 2 Ω resistor is replaced by an 8 Ω resistor without changing the connected…1 mk
- Q31The vision defect which arises due to gradual weakening of the ciliary muscles and diminishing flexibility of eye lens…1 mkasked 3×
- Q31When you look at an object very close to your eyes, the:1 mkasked 3×
- Q31Observe the given ray diagram showing refraction through a prism and choose the correct option for colour of rays 1 and…1 mkasked 2×
- Q31A thin beam of white light falls on a face of a glass prism and a spectrum is obtained on a screen. Which of the…1 mkasked 3×
- Q32Assertion: With the help of compass, magnetic field lines can be traced outside the bar magnet. Reason (R): The north…1 mkasked 3×
- Q32Assertion: The needle of a magnetic compass kept in strong external magnetic field, always aligns itself in north-…1 mkasked 3×
- Q32Assertion: Direction of force exerted on a current-carrying conductor placed in a magnetic field remains same if the…1 mkasked 3×
- Q32Assertion: The needle of a compass, kept in an external magnetic field, always aligns itself in the North-South…1 mkasked 3×
- Q32Assertion: When rays of white light pass through a prism, on emerging they give spectrum of seven colours. Reason (R):…1 mkasked 3×
- Q33With the help of above given ray diagram, calculate the angle of refraction. Given that the refractive index of Medium…2 mk
- Q33Define absolute refractive index of an optical medium. Arrange these material mediums given in the table in increasing…2 mk
- Q33A fuse in electric circuit is rated 4 A. Can it be used with an electric heater of rating 2 kW, 200 V? Explain your…2 mkasked 3×
- Q33Draw the ray diagram showing refraction through a glass slab and write the relation between angle of incidence, angle…2 mk
- Q33Use the above given ray diagram to calculate the angle of incidence. Given that the refractive index of Medium 2 with…2 mk
- Q33Relate the speed of light in the given medium with its optical density. Using the information given in the table below,…2 mk
- Q33A ray of light enters into medium B from medium A as shown in the given figure: Which one of these two media is…2 mk
- Q33The given figure shows image formation by a lens. Analyse the figure and answer the following questions: What is the…2 mk
- Q33Draw the ray diagram for the image formation by a lens which shows a magnification of +2.2 mk
- Q33With the help of the given ray diagram, calculate the refractive index of Medium 2 with respect to Medium 1. (Given…2 mk
- Q33When an incident ray of light enters in a medium 'X' from medium 'Y', it bends away from the normal. Comment about the…2 mk
- Q34State the law which gives the relation between the electric current flowing through a given conductor and the potential…2 mk
- Q34The resistance of a wire of 0.01 cm radius and 1.0 cm length is 7 Ω. Calculate its resistivity. OR An electric heater…2 mkasked 3×
- Q34Define volt, the unit of potential difference. Calculate the work done required to move an electron between two points…2 mk
- Q34A mirror always forms a virtual, erect and diminished image. Identify the mirror and draw a labelled ray diagram for…2 mk
- Q34Attempt either or: What happens when light is scattered from (i) very fine particles and (ii) very large size particles…2 mkasked 3×
- Q34Attempt either or: How does the focal length of eye lens change as the distance of the object from the eyes is altered?…2 mkasked 3×
- Q34Redraw the following ray diagrams in your answer book and show the path of reflected/refracted ray:2 mk
- Q34(i) How does the change in curvature of the eye lens helps us in the process of seeing the nearby objects clearly? (ii)…2 mkasked 3×
- Q34What do the symbols given below represent in an electric circuit? Write one function of each.2 mk
- Q35Write the name of the lens and position of the object in front of it so that a virtual and magnified image is formed.…3 mk
- Q35Observe the given ray diagram and compare: (i) the speed of light in medium A and the speed of light in medium B. (ii)…3 mkasked 2×
- Q35Write the expression for the magnification produced by a lens in terms of object distance and image distance. A 4 cm…3 mk
- Q35Draw the ray diagram for refraction of light through a glass prism and mark angle of refraction and angle of deviation.…3 mkasked 3×
- Q35Study the given diagram and answer the questions that follow: Write the name of the eye defect shown in the diagram.…3 mkasked 3×
- Q35State the laws which help to find out the angle of incidence and angle of reflection in the ray diagram given above.…3 mk
- Q35A person is unable to read a book placed closer than 1 meter from his eyes. Identify the defect of vision in his eyes.…3 mk
- Q36A ray of light after reflection from a concave mirror becomes parallel to its principal axis. Draw a labelled ray…3 mk
- Q36Describe an activity to show that a current carrying conductor, placed in an external magnetic field experiences a…3 mkasked 3×
- Q36An object of height 6 cm is placed at a distance of 30 cm from the optical centre of a concave lens of focal length 15…3 mk
- Q36Explain the phenomenon of rainbow formation in the sky. Draw the labelled ray diagram in support of your explanation.3 mkasked 2×
- Q36What is scattering of light? How is scattering of light different from reflection of light? Explain.3 mkasked 3×
- Q36Name a device which is used to: (i) Maintain a constant potential difference in a circuit. (ii) Change the electric…3 mkasked 2×
- Q36An object is placed at a distance of 30 cm in front of a convex lens of focal length 15 cm. Use lens formula to…3 mk
- Q37On the basis of the given circuit arrangement, answer the following questions: What happens to the rod AB when the key…3 mkasked 3×
- Q37What is Tyndall effect? What happens when sunlight is scattered from the particles of very large size? 'Danger' signals…3 mk
- Q37Consider the given electric circuit: Calculate the following: Total resistance of the circuit The electric current…3 mkasked 3×
- Q37Why does an electric bulb become dim when an electric heater in parallel circuit is switched ON? How to connect three…3 mkasked 3×
- Q37The pattern of magnetic field due to a current carrying wire depends upon the shape made by that wire. Justify. A…3 mkasked 3×
- Q37A person is suffering from a defect of vision due to the elongation of his/her eye ball. Write the name of the defect…3 mk
- Q37The values of current I flowing in a given resistor for the corresponding values of potential difference V applied…3 mkasked 3×
- Q37What is hypermetropia? Write any one cause of hypermetropia. With the help of a suitable ray diagram, explain how…3 mk
- Q37A mirror used for rear-view of an automobile has a focal length 2.0 m. If a car is located at 8.0 m from the mirror -…3 mk
- Q37State Ohm's law and justify that V - I graph for Ohm's law will always be a straight line passing through the origin.…3 mk
- Q38The above ray diagram is to show image formation by a reflecting telescope. Reflecting telescope revolutionized our way…4 mkasked 3×
- Q38Read the following passage and answer the questions that follow: Swati, a class 10 student, observes that when she…4 mkasked 3×
- Q38Read the following passage and answer the questions given: Lenses can form different types of images depending upon…4 mkasked 3×
- Q38The variation of image distance (v) with the object distance (u) for a convex lens is given in the following…4 mkasked 3×
- Q38Three students Shweta, Ayesha and Samridhi were performing an experiment to understand the factors on which the…4 mkasked 3×
- Q39(i) Consider the following electric circuit: Calculate the values of the following: (I) Total resistance of the…5 mk
- Q39Study the given electric circuit in which 2 A electric current is flowing between points X and Y. (i) Using the…5 mk
- Q39(i) The given electric circuit is a part of an electrical device. Use the information given in the electric circuit…5 mk
- Q39(i) The magnetic field lines due to two bar magnets X and Y are shown in the given diagram. If the magnet X is…5 mk
- Q39(i) State the rules to determine the following: (I) Direction of magnetic field produced around a current-carrying…5 mk
- Q39(i) Draw a diagram showing the magnetic field lines around a bar magnet. Write any two characteristics of magnetic…5 mk
- Q39Attempt either or: (i) State the rule which gives the direction of force acting on a current-carrying conductor placed…5 mk
- Q39(i) Derive an expression for the equivalent resistance of three resistors connected in parallel with a battery as shown…5 mk
- Q39(i) List any two features of the electric current used in the houses of India. (ii) Write any two differences between…5 mk
- Q39(i) State the rule which gives the direction of force acting on a current carrying conductor placed in a uniform…5 mk
- Q39Attempt either or: A person was repairing an electric heater. He observed that there were three different connecting…5 mk
- Q39V-I graph for a nichrome wire is shown in the diagram. (i) Prove that the graph follows Ohm's law and calculate the…5 mk
- Q39(i) Due to change in length and area of cross-section of a conductor, resistance of conductor changes while resistivity…5 mk
- Q39Attempt either or: (i) Write the name and statement of the rule used to determine the direction of the: (I) force…5 mk
- Q39Attempt either or: (i) What is a solenoid? Draw a diagram showing the magnetic field pattern due to a current-carrying…5 mk
Other Science years
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