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Board Paper of Class 10 Science Term-II 2022 Delhi(Set 3) - Solutions

General Instructions:

Read the following instructions carefully and strict}y follow them:

(i) This question paper contains 15 questions. All questions are compulsory.

(ii) This question paper is divided into three Sections viz. Section A, B and C.

(iii) Section A - Question numbers 1 to 7 are short answer type questions. Each question carries two marks.

(iv) Section B - Question numbers 8 to 13 are also short answer type questions. Each question carries three marks.

(v) Section C - Question numbers 14 and 15 are case based questions. Each question carries four marks.

(vi) Internal choices have been provided in some questions. Only one of the alternatives has to be attempted.

  • Question 1
    (i) Write the electronic configuration of element X, given by its symbol as under:

    (ii) Determine its position in the modern periodic table.
    (iii) What is the nature of its oxide?
    (iv) Name one other element of its group. VIEW SOLUTION

  • Question 2
    (i) Write the name and draw the structure of a saturated hydrocarbon with four carbon atoms.

    (ii) Write the number of single covalent bonds present in this compound. VIEW SOLUTION

  • Question 3
    (a) Name the reproductive and non-reproductive parts of bread mould (Rhizopus).
    (b) List any two advantages of vegetative propagation. VIEW SOLUTION

  • Question 4
    (a) State one drawback of each of the following: 
    (i) Oral contraceptive pills
    (ii) Copper-T

    (b) Under which category of contraceptive methods, is the use of condom kept ? In what way, its use is better as compared to other methods of contraception? VIEW SOLUTION

  • Question 5
    When is the force experienced by a current – carrying straight conductor placed in a uniform magnetic field.
    (i) Maximum ;
    (ii) Minimum ?


    (a) Name the poles P, Q, R and S of the magnets in the following figures 'a' and 'b':

    (b) State the inference drawn about the direction of the magnetic field lines on the basis of these diagrams. VIEW SOLUTION

  • Question 6
    In the following food chain, only 2J of energy was available to the peacocks. How much energy would have been present in Grass ? Justify your answer.


    (a) What is meant by garbage ? List two classes into which garbage is classified.
    (b) What do we actually mean when we say that the "enzymes are specific in their action" ? VIEW SOLUTION

  • Question 7
    Name the reproductive parts of an angiosperm. Where are these parts located? Explain the structure of its male reproductive part.


    What is puberty? Mention any two changes that are common to both boys and girls in early teenage years. VIEW SOLUTION

  • Question 8
    Consider the following organic compounds:
    (a) Name the functional group present in their compounds.
    (b) Write the general formula for the compounds of this functional group.
    (c) State the relationship between these compounds and draw the structure of any other compound having similar functional group.


    (a) Draw the electron dot structure for ethyne.
    (b) List two differences between the properties exhibited by covalent compounds and ionic compounds. VIEW SOLUTION

  • Question 9
    (a) State Newland Law of Octaves.
    (b) With an example, explain Dobereiner's Triads.
    (c) List one limitation each of both the attempts mentioned in 'a' & 'b'. VIEW SOLUTION

  • Question 10
    (a) What is the heating effect of electric current?
    (b) Write an expression for the amount of heat produced in a resistor when an electric current is passed through it stating the meanings of the symbols used.
    (c) Name two appliances based on heating effect of electric current. VIEW SOLUTION

  • Question 11
    What are Chromosomes? Explain how stability of the DNA of the species is ensured in sexually reproducing organisms. VIEW SOLUTION

  • Question 12
    (a) We do not clean ponds or lakes, but an aquarium needs to be cleaned regularly. Why?
    (b) Why is ozone layer getting depleted at the higher levels of the atmosphere? Mention one harmful effect caused by its depletion. VIEW SOLUTION

  • Question 13
    (a) List the factors on which the resistance of a uniform cylindrical conductor of a given material depends.
    (b) The resistance of a wire of 0.01 cm radius is 10 Ω. If the resistivity of the wire is 50 × 10–8 Ω m, find the length of this wire.


    (a) What is the meaning of electric power of an electrical device? Write its SI unit.
    (b) An electric kettle of 2 kW is used for 2 h. Calculate the energy consumed in
    (i) kilowatt hour and
    ​(ii) joules. VIEW SOLUTION

  • Question 14
    A student was asked to perform an experiment to study the force on a current carrying conductor in a magnetic field. He took a small aluminum rod AB, a strong horse shoe magnet, some connecting wires, a battery and a switch and connected them as shown. He observed that on passing current, the rod gets displaced. On reversing the direction of current, the direction of displacement also gets reversed. On the basis of your understanding of this phenomenon, answer the following questions:

    (a) State the condition under which the displacement of the rod is largest for the same magnitude of current flowing through it. 

    (b) State the rule that determines the direction of the force on the  conductor AB.

    (c) (i) If the U shaped magnet is held vertically and the aluminum rod is suspended horizontally with its end B towards due north,
    then on passing current through the rod from B to A as shown, in which direction will the rod be displaced?

    (ii) Name any two devices that use current carrying conductors and magnetic field.


    Draw the pattern of magnetic field lines produced around a current carrying straight conductor held vertically on a horizontal cardboard. Indicate the direction of the field lines as well as the direction of current flowing through the conductor.


  • Question 15
    Mendel blended his knowledge of Science and mathematics to keep the count of the individuals exhibiting a particular trait in each generation. He observed a number of contrasting visible characters controlled in pea plants in a field. He conducted many experiments to arrive at the laws of inheritance. 
    (a) What do the F1 progeny of tall plants with round seeds and short plants with wrinkled seeds look like?
    (b) What are recessive traits?
    (c) Mention the type of the new combinations of plants obtained in F2 progeny along with their ratio, if F1 progeny was allowed to self pollinate.


    If 1600 plants were obtained in F2 progeny, write the number of plants having traits:

    (i) Tall with round seeds
    (ii) Short with wrinkled seeds
    Write the conclusion of the above experiment. VIEW SOLUTION
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