CBSE Class 10 Science 2022

Marks by chapter

Counted from the 123 questions listed below, as the 2022 papers print them. CBSE allocates marks per unit, not per chapter — this is what was observed, not an official CBSE weightage. Every year compared →

123 questions from 2022

• Q1In the following food chain, only 2J of energy was available to the peacocks. How much energy would have been present…2 mk
• Q1(i) Write the electronic configuration of element X, given by its symbol as under: _20^40 X. (ii) Determine its…2 mk
• Q1Name the part/organ of the human male reproductive system which is a common passage for both sperms as well as urine.…2 mk
• Q1Write the molecular formula of the following carbon compounds: (i) Methane (ii) Propane Carbon compounds have low…2 mk
• Q1Differentiate between the process of binary fission and multiple fission giving an example of each.2 mk
• Q1Kulhads (disposable cups made of clay) and disposable paper cups both are used as an alternative for disposable plastic…2 mk
• Q1Explain giving reason why although the nuclear charge in atoms increases in moving from left to right in a period as…2 mk
• Q1"Carbon prefers to share its valence electrons with other atoms of carbon or with atoms of other elements rather than…2 mk
• Q1Two elements, A and B belong to the 3^rd period of Modern Periodic Table. Element A belongs to Group 1 whereas Element…2 mk
• Q2In the modern periodic table, compare the tendency of the elements to lose electrons while moving (i) down a group, and…2 mk
• Q2The electrons in the atoms of two elements X and Y are distributed in three shells having 1 and 7 electrons…2 mk
• Q2Name the poles P, Q, R and S of the magnets in the following figures 'a' and 'b': 1 / 2+1 / 2+1=2 Figure 'a' Figure 'b'…2 mk
• Q2As shown in the diagram an aluminium rod 'AB' is suspended horizontally between the two poles of a strong horse shoe…2 mk
• Q2The atomic number of an element 'X' is 11. (i) Write the electronic configurations of X and find its valency. (ii)…2 mk
• Q2(i) Write the name and draw the structure of a saturated hydrocarbon with four carbon atoms. (ii) Write the number of…2 mk
• Q2The atomic number of a non-metal 'X' is 8. Write the period number and the group number of 'X'. Draw the electron dot…2 mk
• Q2Draw the electron dot structure of the following: Cyclohexane Butane2 mk
• Q3State the criteria used by Mendeleev for creating his Periodic Table. Compare the position of isotopes of elements in…2 mk
• Q3Using height (tallness / dwarfness) of a plant as an example, show that genes control the characteristics or traits in…2 mk
• Q3Give reasons: (i) Placenta is extremely essential for foetal development. (ii) Uterine lining becomes thick and spongy…2 mk
• Q3Draw two structural isomers of butane.2 mk
• Q3Which of the following flowers will have higher possibility of self-pollination? Mustard, Papaya, Watermelon, Hibiscus…2 mk
• Q3Consider the following molecular formulae of carbon compounds: (i) CH_3 COOH (ii) CH_3 OH (iii) C_2 H_6 (iv) C_3 H_4…2 mk
• Q4Which one of the two multicellular organisms - Spirogyra and Planaria reproduces by regeneration and why? Give an…2 mk
• Q4Give the criteria on the basis of which elements are placed (i) in a group and (ii) in a period in the modern periodic…2 mk
• Q4Mention the functions of Placenta Fallopian tubes Uterus and Ovary in the human female reproductive system.2 mk
• Q4Name the reproductive and non-reproductive parts of bread mould (Rhizopus). List any two advantages of vegetative…2 mk
• Q4Write the electronic configuration of an element X having atomic number 24. Explain how on the basis of this electronic…2 mk
• Q4What happens when in a human female the egg released by the ovary is not fertilised? Name one bacterial and one viral…2 mk
• Q4State one drawback of each of the following: 1/2 × 4=2 (i) Oral contraceptive pills (ii) Copper-T Under which category…2 mk
• Q4An electric heater rated 1100 W operates at 220 V. Calculate (i) its resistance, and (ii) the current drawn by it. OR…2 mk
• Q5In the following figure showing a germinating gram seed, name the parts labelled as A, B and C: Why is part ' B '…2 mk
• Q5Name the process shown below and define it: Name the types of cells present in the organisms which exhibit this process.2 mk
• Q5Draw the electron dot structure of the following: Benzene Ethane2 mk
• Q5What is variation? List two main reasons that may lead to variation in a population. OR (i) In a cross between violet…2 mk
• Q5Name the reproductive parts of an angiosperm. Where are these parts located? Explain the structure of its male…2 mk
• Q5"The improvement in our lifestyle has led to the generation of large amount of waste material." List two reasons to…2 mk
• Q5In the given diagram, name the parts where (i) pollen grains are produced, and (ii) pollen grains are transferred. What…2 mk
• Q5What is Regeneration? Explain the process of regeneration in Planaria.2 mk
• Q5Suggest any two contraceptive methods to control the size of human population and explain them.2 mk
• Q6A part of modern periodic table is given below. On its basis, answer the following questions: 1/2 × 4=2 Write the…2 mk
• Q6Differentiate between binary fission in Amoeba and binary fission in Leishmania. How does reproduction take place in…2 mk
• Q6In the following food chain, only 2J of energy was available to the peacocks. How much energy would have been present…2 mk
• Q6Mendel crossed two pea plants with visible contrasting characteristics and found that there were no half-way…2 mk
• Q6Name the poles P, Q, R and S of the magnets in the following figures 'a' and 'b': Figure 'a' Figure 'b' State the…2 mk
• Q6What is a Döbereiner triad? Why can't the following three elements form such a triad? N(14); P(31); As(75) (Atomic…2 mk
• Q6As shown in the diagram an aluminium rod 'AB' is suspended horizontally between the two poles of a strong horse shoe…2 mk
• Q6(i) Name and state the rule to determine the direction of force experienced by a current carrying straight conductor…2 mk
• Q6Consider the carbon compounds having following molecular formula: (i) C_2 H_2 (ii) C_2 H_6 (iii) C_3 H_7 OH (iv) C_2…2 mk
• Q7Name the part/organ of the human female reproductive system where contraceptive devices such as loop or copper-T are…2 mk
• Q7What is ozone? How is it formed in the upper layers of the Earth's atmosphere? How does ozone affect our ecosystem? OR…2 mk
• Q7The molecular formulae of two alkynes, A and B are C_x H_2 and C_3 H_y respectively. Find the values of x and y. Write…2 mk
• Q7State Modern Periodic Law. How many rows and columns are there in the Modern Periodic Table?2 mk
• Q7Write the chemical formula of two consecutive homologous of organic compounds having functional group -OH. What happens…2 mk
• Q7Consider the carbon compounds having following molecular formula: (i) C_3 H_6 (ii) C_3 H_8 (iii) C_4 H_6 (iv) C_6 H_6…2 mk
• Q7In the following food chain, only 2J of energy was available to the peacocks. How much energy would have been present…2 mk
• Q8List two advantages of adopting the atomic number of an element as the basis of classification of elements in the…3 mk
• Q8What are human-made ecosystems? Give an example. Can a human-made ecosystem become a self-sustaining ecosystem? Give…3 mk
• Q8State Newland Law of Octaves. 1+1+1/2+1 1/2=3 With an example, explain Dobereiner's Triads. List one limitation each of…3 mk
• Q8Write the relationship between electrical resistance and electrical resistivity for a metallic conductor of cylindrical…3 mk
• Q8Name the elements whose compounds formed the basis of classification in Mendeleev's periodic table. Why did Mendeleev…3 mk
• Q9Draw two different possible structures of a saturated hydrocarbon having four carbon atoms in its molecule. What are…3 mk
• Q9In the diagram given below, Coil- 1 is connected in series with a battery and a plug key while Coil- 2 is connected…3 mk
• Q9Consider the following organic compounds: (i) (ii) Name the functional group present in their compounds. Write the…3 mk
• Q9You are provided with a resistor, a key, an ammeter, a voltmeter, four cells of 1.5 V each and few connecting wires.…3 mk
• Q9State the reason why (i) carbon compounds have low melting and boiling points. (ii) carbon compounds do not conduct…3 mk
• Q9What are trophic levels? Why are autotrophs considered to be at the first trophic level of all food chains? State the…3 mk
• Q10In the following table, some elements have been arranged in a certain pattern: Identify the periodic law with which the…3 mk
• Q10In flowering plants, the pollen grains are transferred to stigma by pollination but the female germ cells are present…3 mk
• Q10Calculate the resistance of a metal wire of length 2 m and area of cross-section 1 · 55 × 10^-6 m^2. (Resistivity of…3 mk
• Q10What are decomposers? State the role of decomposers in the natural replenishment of the soil. Why are decomposers not…3 mk
• Q10Mention one function each of the following organs in human male reproductive system: (i) Testis (ii) Scrotum (iii) Vas…3 mk
• Q10What is the heating effect of electric current? Write an expression for the amount of heat produced in a resistor when…3 mk
• Q10Draw the pattern of magnetic field lines around a bar magnet. Mark the position of North Pole, South Pole and the…3 mk
• Q10In the given circuit determine the value of: (i) total resistance of the circuit (ii) current flowing through the…3 mk
• Q10Name the two types of gametes produced by men. 1/2+1/2 Does a male child inherit X chromosome from his father? Justify.…3 mk
• Q10For a heater, rated 4 kW and 220 V, calculate the following: The current Energy consumed in 2 hours If 1 kWh is priced…3 mk
• Q11What is a Solenoid? Draw the pattern of the magnetic field lines around a current carrying solenoid. Mark on the…3 mk
• Q11Three resistors R_1, R_2 and R_3 are connected in parallel and the combination is connected to a battery, an ammeter, a…3 mk
• Q11A red-eyed individual is crossed with a white-eyed individual to produce F_1 progeny with red eyes. When F_1…3 mk
• Q11In 1987, the United Nations Environment Programme (UNEP) forged an agreement to freeze the production of a certain…3 mk
• Q11What are Chromosomes? Explain how stability of the DNA of the species is ensured in sexually reproducing organisms.3 mk
• Q11State Ohm's Law. Represent it mathematically. Define 1 ohm. What is the resistance of a conductor through which a…3 mk
• Q11A green stemmed tomato plant denoted by (GG) is crossed with a tomato plant with purple stem denoted by (gg). (i) What…3 mk
• Q11"Two different forms of carbon - diamond and graphite have different structures and very different physical properties…3 mk
• Q11A cross was made between green-stemmed tomato plants denoted by (GG) and purple-stemmed tomato plants denoted as (gg)…3 mk
• Q12Draw the pattern of magnetic field lines produced by a current carrying circular loop showing the direction of current…3 mk
• Q12Consider the following organic compounds: (i) (ii) Name the functional group present in their compounds. Write the…3 mk
• Q12(i) Define Electric Power and write its SI unit. 1/2+1/2 (ii) Two bulbs rated 100 W; 220 V and 60 W; 220 V are…3 mk
• Q12List the factors on which the resistance of a uniform cylindrical conductor of a given material depends. The resistance…3 mk
• Q12A student wants to use an electric heater, an electric bulb and an electric fan simultaneously. How should these…3 mk
• Q12In the diagram given below, Coil - 1 is connected in series with a battery and a plug key while Coil - 2 is connected…3 mk
• Q13Draw a diagram showing flow of energy from solar input to a food chain having four trophic levels in an eco system.…3 mk
• Q13Name the group of organisms which form in the first trophic level of all food chains. Why are they called so? Why are…3 mk
• Q13How do Mendel's experiments show that the traits are inherited independently? Explain.3 mk
• Q13State Newland Law of Octaves. 1+1+1/2+1/2=3 With an example, explain Dobereiner's Triads. List one limitation each of…3 mk
• Q13An electric motor rated 1100 W is connected to 220 V mains. Find: (i) The current drawn from the mains, (ii) Electric…3 mk
• Q13We do not clean ponds or lakes, but an aquarium needs to be cleaned regularly. Why? Why is ozone layer getting depleted…3 mk
• Q13Explain the reason why in a food chain the number of individuals decreases as we move from lower trophic level to…3 mk
• Q14AB is a coil of copper wire having a large number of turns. The ends of the coil are connected with a galvanometer as…4 mk
• Q14AB is a coil of copper wire having a large number of turns. The ends of the coil are connected with a galvanometer as…4 mk
• Q14Mendel blended his knowledge of Science and mathematics to keep the count of the individuals exhibiting a particular…4 mk
• Q14The modes by which various organisms reproduce depend on the body design of the organisms. In asexual reproduction, a…4 mk
• Q14A student was asked to perform an experiment to study the force on a current carrying conductor in a magnetic field. He…4 mk
• Q14A student was asked to perform an experiment to study the force on a current carrying conductor in a magnetic field. He…4 mk
• Q14AB is a coil of copper wire having a large number of turns. The ends of the coil are connected with a galvanometer as…4 mk
• Q14A student fixes a sheet of white paper on a drawing board using some adhesive materials. She places a bar magnet in the…4 mk
• Q14The mechanism by which the sex of an individual is determined is called sex-determination. In human beings, sex of a…4 mk
• Q14Study the following electric circuit in which the resistors are arranged in three arms A, B and C: Find the equivalent…4 mk
• Q14Study the following electric circuit in which the resistors are arranged in three arms A, B and C: Find the equivalent…4 mk
• Q14A student fixes a sheet of white paper on a drawing board using some adhesive materials. She places a bar magnet in the…4 mk
• Q15Mendel blended his knowledge of Science and mathematics to keep the count of the individuals exhibiting a particular…4 mk
• Q15Sex of an individual is determined by different factors in various species. Some animals rely entirely on the…4 mk
• Q15The modes by which various organisms reproduce depend on the body design of the organisms. In asexual reproduction, a…4 mk
• Q15The mechanism by which the sex of an individual is determined is called sex-determination. In human beings, sex of a…4 mk
• Q15Sex of an individual is determined by different factors in various species. Some animals rely entirely on the…4 mk
• Q15Sex of an individual is determined by different factors in various species. Some animals rely entirely on the…4 mk
• Q15A student was asked to perform an experiment to study the force on a current carrying conductor in a magnetic field. He…4 mk
• Q15The modes by which various organisms reproduce depend on the body design of the organisms. In asexual reproduction, a…4 mk
• Q15A student fixes a sheet of white paper on a drawing board using some adhesive materials. She places a bar magnet in the…4 mk
• Q15Mendel blended his knowledge of Science and mathematics to keep the count of the individuals exhibiting a particular…4 mk
• Q15Study the following electric circuit in which the resistors are arranged in three arms A, B and C: Find the equivalent…4 mk
• Q15The mechanism by which the sex of an individual is determined is called sex-determination. In human beings, sex of a…4 mk