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Board Paper of Class 10 2016 Science - Solutions

General Instructions:
(i) Draw well-labelled diagrams wherever necessary.
(ii) All questions are compulsory.
(iii) Students should write the answers of questions in sequence.

  • Question 1
    (1) Fill in the blanks:
      (i) The modern periodic table consists of ……………. periods.  
      (ii) The formulae of chloride of metal M is MCl2. The metal M belongs to ……………. group.  
      (iii) Corrosion can be prevented by using ……………. solution.  
      (2) Find the odd one out: [2]
      (i) Voltmeter, ammeter, galvanometer, thermometer.  
      (ii) Loudspeaker, bar magnet, electric motor, microphone.  
    Choose the correct alternative and rewrite the following:
      (1) Reaction of iron nails with copper sulphate solution is an example of
    (a) Combination reaction
    (b) Decomposition reaction
    (c) Displacement reaction
    (d) Double displacement reaction
      (2) Dilute NaOH can be tested with
    (a) red litmus paper
    (b) blue litmus paper
    (c) lime water
    (d) Na2CO3
      (3) In series combination which remains constant?
    (a) Voltage
    (b) Current
    (c) Both current and voltage
    (d) Both are variables
      (4) An object of 10 cm is placed in front of a plane mirror. The height of image will be …………….
    (a) 5 cm
    (b) 15 cm
    (c) 20 cm
    (d) 10 cm
      (5) When a ray of light travels from air to glass slab and strikes the surface of separation at 90°, then it …………….
    (a) bends towards normal
    (b) bends away from normal
    (c) passes unbent
    (d) passes in zigzag way

  • Question 2
    Answer the following questions (any five):
    (1) Define the following:
    (i) 1 volt PD
    (ii) Electric power
    (2) What major harm is done to the human beings by air pollution?  
    (3) Calculate the focal length of a corrective lens having power +2D.  
    (4) Write two applications of sodium bicarbonate (baking soda).  
    (5) A simple microscope is used by watch repairers. Give reason.  
    (6) Draw neat and labelled diagram of pH scale.  

  • Question 3
    Answer the following questions (any five):
    (1) What are the main features of Mendeleev’s periodic table?
    (2) Define ‘redox reaction’. Give one example.  
    (3) Given below is a diagram showing a defect of human eye. Study it and answer the following questions.

    (i) Name the defect shown in the figure.
    (ii) Give reason for this defect of eye in human being.
    (iii) Name the type of lens used to correct the eye defect.
    (4) What is refraction of light? How is it related to refractive index?  
    (5) Explain how spectrum is formed.  
    (6) Suggest measures in the following situations:
    (i) To avoid noise pollution in classroom.
    (ii) To minimize electricity consumption at home.
    (iii) Bursting fire crackers in festivals and processions.

  • Question 4
    Answer any one of the following questions:
    (1) Find the expression for the resistors connected in series and write the two characteristics of it. (Draw figure).  
    (2) Explain ‘Electric motor’ with the help of the following points:
    (i) Draw figure
    (ii) Principle of Electric motor
    (iii) Name any four appliances where electric motor is used.
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