CBSE Class 10 Science 2026
314 questions · 652 marks · 312 with the board’s own marking-scheme answer, 2 with no official answer on the site.
Marks by chapter
Counted from the 314 questions listed below, as the 2026 papers print them. CBSE allocates marks per unit, not per chapter — this is what was observed, not an official CBSE weightage. Every year compared →
| 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% |
314 questions from 2026
- Q1Which structure in a leaf is mainly responsible for gaseous exchange?1 mk
- Q1Pravin was given a list of characteristics associated with the process of anaerobic respiration in humans, in the table…1 mk
- Q1Identify the part that controls the closing and opening of the stomatal pore in leaves of plants. Select the correct…1 mk
- 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 mk
- Q1Observe the given figure and select the statement that correctly states how these fungi obtain nutrition.1 mk
- Q2Observe the figure given below and identify the incorrect step for the activity set-up:1 mk
- 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 mk
- 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 mk
- Q3Given below are some of the statements regarding our environment: (i) Change in our life-styles have resulted in…1 mk
- Q3Spirogyra, despite being a multi-cellular organism, still shows a simple reproductive method. Select the correct option…1 mk
- 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 mk
- Q3An ecosystem contains maximum number of:1 mk
- Q3Identify the correct statement for spirogyra, leishmania and hydra:1 mk
- 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 mk
- 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 mk
- Q4The carbohydrates, which are not used immediately in plants, are stored in the form of 'a', which serves as an internal…1 mk
- 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 mk
- Q5When a human egg is fertilized by a sperm having 'Y' chromosome, the zygote has the following combination of…1 mk
- 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 mk
- Q5Pancreas secretes pancreatic juice which contain certain enzyme that helps in digestion of food. Choose the correct…1 mk
- 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 mk
- Q5Following are the statements about the different parts of the brain. Select the correct statements. (i) The thinking…1 mk
- 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 mk
- Q6In accumulation of toxic substances at higher trophic levels of an ecosystem through the food chain, which of the…1 mk
- 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 mk
- 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 mk
- 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 mk
- Q7In human beings the oxygen rich blood is pumped out to the body by:1 mk
- 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 mk
- Q7Which of the following limits the number of trophic levels in a food chain?1 mk
- 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 mk
- 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 mk
- Q8Assertion: Blood plasma transports carbon dioxide in dissolved form, while oxygen is transported by respiratory…1 mk
- Q8Assertion: Bacteria that can withstand heat have better chances of survival in a heat wave. Reason (R): Accumulation of…1 mk
- Q8Assertion: Variations are not often seen in off-springs produced by asexual reproduction. Reason (R): DNA molecule…1 mk
- Q9Assertion (A): Ozone (O_3) gas at higher levels of atmosphere is a product of UV radiation acting on Oxygen (O_2).…1 mk
- Q9Assertion: The basic filtration unit in the kidneys, like in the lungs, is a cluster of very thin-walled blood…1 mk
- 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 mk
- 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 mk
- 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 mk
- Q9Assertion: Highest percentage of pesticides is found in tertiary consumers in a food chain. Reason (R): Chemicals /…1 mk
- 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 mk
- 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 mk
- 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 mk
- 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 mk
- 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 mk
- Q11State two differences between the act of chewing food and salivation on sight of food. OR State two differences between…2 mk
- Q11Observe the given figure and identify the labelled parts P, Q, R and S: OR Which of the plant hormones are responsible…2 mk
- 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 mk
- Q12Varun is diabetic. His latest ultrasound reports showed a blockage in his pancreatic duct. How will this affect the…2 mk
- Q12Separation of right side and left side of the heart is useful to keep oxygenated and deoxygenated blood from mixing.…2 mk
- 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 mk
- Q13Give reasons for the following: Adrenal gland is known as the stress gland of the body. Prenatal sex determination is…3 mk
- 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 mk
- Q13In xylem tissue, vessels and tracheids of the roots, stems and leaves are interconnected to form a continuous system of…3 mk
- 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 mk
- Q14Study the given table and answer the following questions: Depict the information given in the table in the form of a…3 mk
- Q14Mention any one harmful effect of using plastic bags on the environment. Suggest better alternatives to the usage of…3 mk
- Q14Show the cross and observations made by Mendel when he crossed pure tall pea plant with a pure short pea plant to get…3 mk
- 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 mk
- 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 mk
- Q15Read the following passage and answer the questions that follow: A middle-aged person is facing some cognitive changes…4 mk
- Q15Plants exhibit movements in response to various environmental stimuli to adopt and survive in their surroundings. These…4 mk
- Q15Read the following passage and answer the questions that follow: Not all plants carry out photosynthesis by the same…4 mk
- Q15Mendel took garden pea plants with different characteristics, such as height to study the inheritance pattern of…4 mk
- Q16Attempt either or: Observe the given diagram and answer the questions that follow: (i) Give the name of the structure…5 mk
- Q16Given below are certain situations. Analyse each and describe its possible impact: (i) A population of bacteria living…5 mk
- Q16Attempt either or: (i) Name an organ that helps in the formation of male germ cells in humans and also mention the…5 mk
- Q16(i) In an angiospermic flower, fertilization is said to take place when male gametes carried in the pollen tube fuse…5 mk
- Q16Draw a labelled diagram showing open and closed stomatal pore. List the main events that occur during the process of…5 mk
- Q17The volume ratio of hydrogen and oxygen gases liberated during electrolysis of water is1 mk
- Q17Which of the following is an example of a displacement reaction?1 mk
- 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 mk
- 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 mk
- 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 mk
- 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 mk
- 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 mk
- Q18Which one of the following can be used as an acid-base indicator by a visually impaired (blind) student?1 mk
- Q18Which of the following set of compounds does not belong to same homologous series?1 mk
- Q18A metal carbonate reacts with a solution X which forms a salt, water and a gas Y. What are X and Y?1 mk
- Q19An aqueous solution turns red litmus blue. Excess addition of which of the following solution would reverse the change?1 mk
- 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 mk
- Q19When ferrous sulphate crystals are heated in a test tube, we observe that:1 mk
- Q19Which of the following is an amphoteric oxide?1 mk
- 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 mk
- 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 mk
- 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 mk
- Q20Study the following table and select the correct option: (Salt, Acid used, Base used, Nature of Salt)1 mk
- Q21Which one of the following metals does not react with cold water?1 mk
- Q21The reaction of calcium with cold water is:1 mk
- Q21Which of the following will not undergo addition reaction?1 mk
- 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 mk
- 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 mk
- Q22Alloys are homogeneous mixture of metal with a metal or non-metal. Which among the following alloys contain non-metal…1 mk
- Q22The natural sources of oxalic acid, lactic acid and methanoic acid respectively are:1 mk
- 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 mk
- 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 mk
- 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 mk
- Q23A student notices that her silver jewellery turned dull and had a grey-black coating over it after wearing for a few…1 mk
- 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 mk
- 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 mk
- 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 mk
- Q24Assertion: Carbon shares its valence electrons with other atoms of carbon or with atoms of other elements. Reason (R):…1 mk
- Q24In the question, two statements are given - One labelled as Assertion and other labelled as Reason (R). Write the…1 mk
- 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 mk
- 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 mk
- 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 mk
- 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 mk
- Q27Give the chemical name and formula of Plaster of Paris. Write the chemical equation of its preparation. Give any two…3 mk
- Q28Read the following passage and answer the questions given below: Most of metals occur in combined state in form of…4 mk
- Q28The pH plays an important role in our daily life. Strength of acids and bases depends on the number of H^+ ions and…4 mk
- Q28Read the following passage and answer the questions that follow: In the given diagram, when electricity is passed…4 mk
- Q28Alcohol forms a homologous series with general formula C_n H_2 n+1-OH and -OH group as functional group. Ethanol is…4 mk
- Q28Read the following passage and answer the questions that follow: An electrochemical process is used for refining metals…4 mk
- Q29(i) Give reasons for the following: (I) Covalent compounds are poor conductor of electricity. (II) Soap does not form…5 mk
- 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 or: (i) What is homologous series? Which two of the following organic compounds belong to the same…5 mk
- 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 mk
- 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 mk
- Q30The correct way to connect an ammeter and a voltmeter in an electric circuit is:1 mk
- 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 mk
- 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 mk
- Q30The pair of eye parts responsible for admitting different amount of light in to the eyes is1 mk
- Q30From the following options choose the one which gives negative magnification greater than one:1 mk
- 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 mk
- 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 mk
- Q31When you look at an object very close to your eyes, the:1 mk
- Q31Observe the given ray diagram showing refraction through a prism and choose the correct option for colour of rays 1 and…1 mk
- 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 mk
- Q32Assertion: With the help of compass, magnetic field lines can be traced outside the bar magnet. Reason (R): The north…1 mk
- Q32Assertion: The needle of a magnetic compass kept in strong external magnetic field, always aligns itself in north-…1 mk
- Q32Assertion: Direction of force exerted on a current-carrying conductor placed in a magnetic field remains same if the…1 mk
- Q32Assertion: The needle of a compass, kept in an external magnetic field, always aligns itself in the North-South…1 mk
- Q32Assertion: When rays of white light pass through a prism, on emerging they give spectrum of seven colours. Reason (R):…1 mk
- 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 mk
- 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 mk
- 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 mk
- Q34Attempt either or: How does the focal length of eye lens change as the distance of the object from the eyes is altered?…2 mk
- 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 mk
- 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 mk
- 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 mk
- Q35Study the given diagram and answer the questions that follow: Write the name of the eye defect shown in the diagram.…3 mk
- 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 mk
- 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 mk
- Q36What is scattering of light? How is scattering of light different from reflection of light? Explain.3 mk
- Q36Name a device which is used to: (i) Maintain a constant potential difference in a circuit. (ii) Change the electric…3 mk
- 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 mk
- 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 mk
- Q37Why does an electric bulb become dim when an electric heater in parallel circuit is switched ON? How to connect three…3 mk
- Q37The pattern of magnetic field due to a current carrying wire depends upon the shape made by that wire. Justify. A…3 mk
- 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 mk
- 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 mk
- Q38Read the following passage and answer the questions that follow: Swati, a class 10 student, observes that when she…4 mk
- Q38Read the following passage and answer the questions given: Lenses can form different types of images depending upon…4 mk
- Q38The variation of image distance (v) with the object distance (u) for a convex lens is given in the following…4 mk
- Q38Three students Shweta, Ayesha and Samridhi were performing an experiment to understand the factors on which the…4 mk
- 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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