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Board Paper of Class 10 2016 Chemistry - Solutions

General Instructions:
1. This question paper contains three sections: Section I, II and III.
2. Section I comprises questions from 1-15. You have to attempt all the 15 questions by choosing the alternatives given in the brackets.
3. Section II comprises questions from 16-47. You have to attempt any twenty questions. Each question carries 2 marks.
4. Section III comprises of four parts: Part I, II, III and IV. You have to attempt any 4 questions by choosing one question from each part. Each question carries 5 marks.

  • Question 1
    Which of the following is inheritable?

    (an altered gene in sperm, an altered gene in liver cells, an altered gene in skin cells, an altered  gene in udder cells.) VIEW SOLUTION

  • Question 2
    ______________ is a bacterial disease.

    (Meningitis, Rabies, Tetanus, Small Pox) VIEW SOLUTION

  • Question 3
    The part of brain which controls emotional reactions in our body is __________.

    (Cerebellum, Cerebrum, Thalamus, Hypothalamus) VIEW SOLUTION

  • Question 4
    Post – fertilization, the ovule changes into a _____________.

    (seed, fruit, endosperm, pericarp) VIEW SOLUTION

  • Question 5
    Normal body temperature of man is ____________.

    (98.4° – 98.6°F, 96.6° – 96.8°F, 94.4° – 98.6°F, 98.4° – 99.6°F) VIEW SOLUTION

  • Question 6
    ___________ of green plants are called factories of food production.

    (Mitochondria, Chloroplasts, Endoplasmic-reticulum, Nucleus) VIEW SOLUTION

  • Question 7
    ______________ is used in seeding clouds.

    (Potassium iodide, Calcium carbonate, Sulphur dioxide, Ammonium phosphate) VIEW SOLUTION

  • Question 8
    ___________ is the chief component of natural gas.

    (Ethane, Methane, Propane, Butane) VIEW SOLUTION

  • Question 9
    In an endothermic process, solubility increases with ____________ in temperature. (increase/decrease) VIEW SOLUTION

  • Question 10
    Chemical volcano is an example of ____________.

    (combination reaction/decomposition reaction) VIEW SOLUTION

  • Question 11
    _____________ is used in making automobile parts.

    (Nickel steel, Stainless steel, Bronze, Magnalium) VIEW SOLUTION

  • Question 12
    Buckminster fullerene is the allotropic form of ____________.

    (Nitrogen, Carbon, Sulphur) VIEW SOLUTION

  • Question 13
    The momentum of a massive object at rest is ____________

    (very large, very small, zero, infinity) VIEW SOLUTION

  • Question 14
    ____________ surface absorbs more heat than any other surface under identical conditions.

    (White, Rough, Black, Yellow) VIEW SOLUTION

  • Question 15
    The phenomenon of producing an emf in a circuit whenever the magnetic flux linked with a coil changes is ____________. 

    (electromagnetic induction, inducing current, inducing voltage, change in current) VIEW SOLUTION

  • Question 16
    Here are certain important hereditary jargons. Fill in the blanks by choosing a suitable one from the list given. (allele, variation, speciation, gene, allelomorphs)

    (i) ____________ are the factors which form the physical basis of inheritance.

    (ii) ____________ is the alternate form of the same gene. VIEW SOLUTION

  • Question 17
    What are variations? Mention their types. VIEW SOLUTION

  • Question 18
    Match the following by identifying the pair.

    (medicines, fuel, microbes, metabolism, organic acids)

    (i) Vaccine                 (ii) Natural gas                   (iii) Citric acid                  (iv) Vitamins VIEW SOLUTION

  • Question 19
    What are the symptoms of common cold?

    (i) ______________.

    (ii) ______________. VIEW SOLUTION

  • Question 20
    Pick out the item which has sequential arrangement.

    (i) Zygotene → Leptotene → Pachytene → Diplotene → Diakinesis.

    (ii) Diakinesis → Zygotene → Leptotene → Pachytene → Diplotene.

    (iii) Leptotene → Zygotene → Pachytene → Diplotene → Diakinesis VIEW SOLUTION

  • Question 21
    (a) Identify figure A and B.

    (b) Which part of A is modified into B.


  • Question 22
    Assertion (A) : Mammalian heart is called myogenic heart.

    Reason (R) : Heart-beat is regulated by a specialized muscle bundle (pacemaker) in mammals.

    (a) Both (A) and (R) are true and (R) explains(A).

    (b) Both (A) and (R) are true but (R) doesn't explain (A).

    (c) (A) is true but (R) is false.

    (d) (A) is false but (R) is true. VIEW SOLUTION

  • Question 23
    Name the three important blood proteins seen in Plasma. Add a note on their functions. VIEW SOLUTION

  • Question 24
    The master chemists of our body are he kidneys. Justify.

    (a) Kidneys filter all chemicals in the body.

    (b) Kidneys maintain the chemical composition of blood.

    (c) Kidneys eliminate all chemicals absorbed by the body.

    (d) Kidneys store the chemicals accumulated in the body. VIEW SOLUTION

  • Question 25
    Match the methods of nutrition of special organs with suitable examples:
    Autotrophs Mycorrhiza Cuscutta
    Parasites Chlorophyll Monotropa
    Saprophytes Haustoria Hibiscus

  • Question 26
    Observe the diagram.

    (i) Mention the type of movements shown in figure A and B.

    (ii) How does this movement differ from the movement of mimosa ? VIEW SOLUTION

  • Question 27
    What is respiration? Give a balanced equation for aerobic respiration. VIEW SOLUTION

  • Question 28
    Depict a food chain by placing the following organisms in the correct trophic levels.

    (snake, grass, eagle, frog, grasshopper) VIEW SOLUTION

  • Question 29
    Find the odd one out:

    (a) bio-alcohol, green diesel, bio-ethers, petroleum.

    (b) cholera, typhoid, scabies, dysentry. VIEW SOLUTION

  • Question 30
    Substituting energy efficient Compact Fluorescent Light bulbs (CFL) for standard incandescent bulbs will save on an average upto 6,000 megawatts of electricity each year.

    Raise questions:

    (a) ____________?

    (b) ____________? VIEW SOLUTION

  • Question 31
    Write any four liquid bio-fuels for transportation. VIEW SOLUTION

  • Question 32
    (a) Which gas is dissolved in soft drinks?

    (b) What will you do to increase the solubility of this  gas? VIEW SOLUTION

  • Question 34
    Calculate the number of molecules in 11 g of CO2. VIEW SOLUTION

  • Question 35
    Identify the wrong statements and correct them.

    (a) Sodium benzoate is used in food preservative.

    (b) Nitric acid is not used as fertilizer in agriculture.

    (c) Sulphuric acid is called the king of chemicals.

    (d) The pH of acid is greater than 7. VIEW SOLUTION

  • Question 36
    The hydrogen ion concentration of a solution is 0.001 M.  What is the pH of the solution? VIEW SOLUTION

  • Question 37
    Correct the mistakes, if any in the following statement.

    In a period,the metallic character of the element increases while their non metallic character decreases. VIEW SOLUTION

  • Question 38
    Assertion (A) : Electroplating method not only protects but also enhances the metallic appearance.

    Reason (R) : Electroplating is a method of coating one metal with another by passing electric current.

    (a) (A) is right, (R) is wrong.

    (b) (A) is right, (R) is not relevant.

    (c) (A) is right, (R) is relevant. VIEW SOLUTION

  • Question 39
    Diamond is the hardest allotrope of carbon. Give reason for its hardness. VIEW SOLUTION

  • Question 40
    Assertion (A) : Liquefied cryogenic gases are sprayed on underground electric cables in big cities.

    Reason (R) : Liquefied cryogenic gases prevent wastage of power.

    (a) (A) is incorrect and (R) is correct.

    (b) (A) is correct and (R) is incorrect.

    (c) Both (A) and (R) are incorrect.

    (d) (A) is correct and (R) supports (A). VIEW SOLUTION

  • Question 41
    As a matter of convention, an anticlockwise moment is taken as ____________ and a clockwise moment is taken as ____________. VIEW SOLUTION

  • Question 42
    Match the following:
    (1)  Potential difference (a)  Coulomb
    (2)  Current (b)  Volt
    (3)  Electric Charge (c) Ohm
    (4)  Resistor (d)  Newton
        (e)  Ampere

  • Question 43
    Fuse wire is made up of an alloy of ____________ which has high resistance and _____________ melting point. VIEW SOLUTION

  • Question 44
    In the list of sources of energy given below, find out the odd one.

    (Solar energy, Thermal energy, Hydropower, Biomass) VIEW SOLUTION

  • Question 45
    The focal length of a concave lens is 2 m. Calculate the power of the lens. VIEW SOLUTION

  • Question 47

    Observe the diagram and fill up the following:

    (a) _____________ defect of eye.

    (b) _____________  lens is used to correct the defect.


  • Question 48
    Kala has delivered a baby.

    (a) Suggest the immunization schedule for the baby, in the first six months.

    (b) What are the diseases that can be cured as per the schedule? VIEW SOLUTION

  • Question 49
    Describe the structure of a neuron with the help of a neat, labelled diagram. VIEW SOLUTION

  • Question 50
    (a) Fruit is the product of fertilization. Is there any fruit which is formed without the act of fertilization?

    (b) Represent the classification of fruits in a diagrammatic sketch. VIEW SOLUTION

  • Question 51
    List out the harmful effects of burning coal. VIEW SOLUTION

  • Question 52
    (a) What are Isotopes?

    (b) Write any three applications of Avogadro's law? VIEW SOLUTION

  • Question 53
    What are the evil effects of consuming alcohol? VIEW SOLUTION

  • Question 54
    Write any five achievements of Chandrayaan – I. VIEW SOLUTION

  • Question 55

    (a) Redraw the diagram.

    (b) This diagram represents ____________.

    (c) Label the parts of the diagram.

    (d) Mention the principle used in the device denoted by this diagram. VIEW SOLUTION
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