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Board Paper of Class 10 2017 Physics - 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
    In persons suffering from insulin - dependent diabetes, the __________ cells of pancreas are degenerated.

    (Alpha, Beta, Gamma, Delta) VIEW SOLUTION
  • Question 2
    The first vaccine injected into a just born baby is _________.

    (Oral polio, DPT, DPT and Oral polio, BCG) VIEW SOLUTION
  • Question 3
    The endocrine gland related to the immune system is __________.

    (Thyroid, Thymus, Adrenal, Pineal) VIEW SOLUTION
  • Question 4
    If a water soaked seed is pressed, a small drop of water comes out through the __________.

    (Stomata, Lenticel, Micropyle, Radicle) VIEW SOLUTION
  • Question 5
    Mitral valve is found between __________.

    (Right auricle and right ventricle, Left auricle and left ventricle, Right ventricle and pulmonary artery, Left ventricle and aorta) VIEW SOLUTION
  • Question 6
    In monotropa the special type of root which absorbs nourishment is the __________.

    (Haustoria, Mycorrhizal root, Clinging root, Adventitious root) VIEW SOLUTION
  • Question 7
    The sedimented and floating materials are removed by this treatment process.

    (Primary treatment, Secondary treatment, Tertiary treatment, Peripheral treatment) VIEW SOLUTION
  • Question 8
    The mixture of gases used by deep-sea divers is __________.

    (helium - oxygen, oxygen - nitrogen, hydrogen - nitrogen) VIEW SOLUTION
  • Question 9
    Vineger contains acetic acid. Curd contains __________ acid.

    (Lactic acid, Tartaric acid, Citric acid) VIEW SOLUTION
  • Question 10
    An element which is an essential constituent of all organic compounds belongs to the __________ group.

    (14th group, 15th group, 16th group) VIEW SOLUTION
  • Question 11
    __________ is used for coagulating rubber from latex.

    (Ethanol, Ethanoic acid) VIEW SOLUTION
  • Question 12
    Screw Gauge is an instrument used to measure the dimensions of very small objects upto __________.

    (0.1 cm, 0.01 cm, 0.1 mm, 0.01 mm) VIEW SOLUTION
  • Question 13
    The physical quantity which is equal to the rate of change of momentum is __________.

    (displacement, acceleration, force, impulse) VIEW SOLUTION
  • Question 14
    Kilowatt-hour is the unit of __________.

    (potential difference, electric power, electric energy, charge) VIEW SOLUTION
  • Question 15
    An electric current through a metallic conductor produces __________ around it.

    (magnetic field, mechanical force, induced current) VIEW SOLUTION
  • Question 16
    The inheritable characters vary in different species and within the same species. Name the variation in the following cases.

    (i) The eye colour among the human beings are varied as blue, black, brown, green etc. This is called as __________ variation.

    (ii) The dentition in the rabbit and the elephant are not the same. This is called as __________ variation. 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
    Marasmus and Kwashiorkar are both protein deficiency defects. Marasmus differs from Kwashiorkar in enlarged belly and swelling in the face. Are these symptoms for the above diseases correct ? If not, correct it. VIEW SOLUTION
  • Question 20
    Copy the diagram and label the parts with the help of the clues given :

    (i) It is otherwise called supra renal gland.

    (ii) It secretes two hormones, namely aldosterone and cortisone. VIEW SOLUTION
  • Question 21
    Draw the given diagram and label the following parts.

    (i) Exine

    (ii) Tube nucleus

  • Question 22
    Mention any four adaptations seen in the camel so that it can live successfully in deserts. VIEW SOLUTION
  • Question 23
    Pick out the odd one out.

    (i) globulin, glomerulus, fibrinogen, albumin

    (ii) mountain goat, big horned sheep, grizzly bear, seal VIEW SOLUTION
  • Question 24
    Complete the table given below :
    Excretory organ Disposed as Excretory products
    Kidneys Urine Nitrogenous waste products -
    Urea, Uric acid, Creatinine etc.
    Lungs Exhaled/Expired air __________
    Skin __________ Excess water and salts
  • Question 25
    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 26
    Sugar solution is converted into alcohol.

    (i) In the above reaction what kind of process takes place?

    (ii) Which micro - organism is involved ? VIEW SOLUTION
  • Question 27
    Match the following :
      A     B
    (a) Ammonotelic (i) annelids
    (b) Ureotelic (ii) fish
    (c) Uricotelic (iii) mammal
    (d) Nephridia (iv) birds
  • 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
    What are the various liquid biofuels for transportation ?   (Any four) VIEW SOLUTION
  • Question 30
    Match the suitable renewable and non-renewable sources.
    Sources A B C
    Renewable Coal Wind Petroleum
    Non - Renewable Hydrogen Natural gas Solar energy
  • Question 31
    Fossil fuels are formed by decomposition of biomass buried under the earth over millions of years ago. Name any two fossil fuels. VIEW SOLUTION
  • Question 33
    Find the concentration of solution in terms of weight percent if 20 g of common salt is dissolved in 50 g of water. VIEW SOLUTION
  • Question 34
    Calculate the number of moles in 12.046 × 1022 atoms of copper. VIEW SOLUTION
  • Question 35
    Two acids ‘A’ and ‘B’ were kept in beakers. Acid ‘A’ undergoes partial dissociation in water, whereas acid ‘B’ undergoes complete dissociation in water.

    (i) Of the two acids ‘A’ and ‘B’. Which is weak acid and which is strong acid ?

    (ii) Give one example for weak acid and strong acid. VIEW SOLUTION
  • Question 36
    Pick the odd one out :

    (i) Inorganic acids : HCl, HNO3, H2SO4, HCOOH

    (ii) Basic Nature : Blood, Baking Soda, Vinegar, Household ammonia VIEW SOLUTION
  • Question 37
    Correct the mistakes, if any in the following statement.

    (i) Second period is a short period. It contains only two elements.

    (ii) Group 18 elements are called Halogen family. VIEW SOLUTION
  • Question 38
    Assertion : A greenish layer appears on copper vessels, if left uncleaned.
    Reason : It is due to the formation of a layer of basic copper carbonate.
    (a) Assertion and reason are correct and relevant to each other.
    (b) Assertion is true but reason is not relevant to the assertion. VIEW SOLUTION
  • Question 39
    An organic compound (A) is widely used as a preservative in pickle and has a molecular formula C2H4O2. This compound reacts with ethanol to form a sweet smelling compound (B).

    (i) Identify the compounds A and B.

    (ii) Name the process and write the corresponding chemical equation. VIEW SOLUTION
  • Question 40
    Assertion (A) : MRI is used to scan the inner organs of human body by penetrating very intense magnetic field.
    Reason (R) : By use of very intense magnetic field, very high resolution images can be obtained.
    (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
    An object of mass 1 kg is dropped from a height of 20 m. It hits the ground and rebounds with the same speed. Find the change in momentum
    (Take g = 10 m/s2) VIEW SOLUTION
  • Question 42
    Match the following :
    (a)  An electric cell (i)
    (b)  Plug key (or) switch (closed) (ii)
    (c)  A wire joint (iii)
    (d)   A resistor of resistance R (iv)
  • Question 43
    Fill in the blanks :

    (i) Potential difference : Voltmeter ; then Current : ___________

    (ii) Hydro power plant : Conventional source of energy ; then Solar energy : __________ VIEW SOLUTION
  • Question 45
    The ray diagram shown below is introduced to show how a concave mirror forms the image of an object.

    (a) Identify the mistake and draw the correct ray diagram.

    (b) Write the justifications for your corrections.

  • Question 47
    If an object is placed 25 cm in front of the converging lens forms an image 20 cm behind the lens, then what is the focal length of the lens? VIEW SOLUTION
  • Question 48
    There is a widespread outbreak of malaria in your area.

    (a) Suggest some controlling measures to the local authorities concerned.

    (b) Write the symptoms for malaria. VIEW SOLUTION
  • Question 49
    (a) Use words from the given list to complete the following paragraph.
    (Vertebral column, Piamater, Arachnoid membrane, Meninges, Duramater)
    The central nervous system is covered by three protective coverings collectively called   (1)  . The outermost cover lying below the skull and   (2)   is double thick and is called    (3)   . The middle covering is thin and vascularised and is called   (4)   . The innermost cover is a very thin delicate membrane and is closely stretched over the outer surface of Brain and Spinal Cord and is called   (5)   .

    (b) Name any 5 types of nerve cells. VIEW SOLUTION
  • Question 50
    Describe the structure of a dicot seed with a neat diagram. VIEW SOLUTION
  • Question 51
    (a) What is Green Chemistry ?

    (b) Write the future products of Green Chemistry. VIEW SOLUTION
  • Question 52
    Modern atomic theory takes up the wave concept, principle of uncertainty and other latest discoveries to give a clear cut picture about an atom. State the findings of modern atomic theory. VIEW SOLUTION
  • Question 53
    Explain the manufacturing of Ethanol from Molasses. VIEW SOLUTION
  • Question 54
    (a) Newton’s first law of motion gives a qualitative definition of force. Justify.

    (b) The figure represents two bodies of masses 10 kg and 15 kg, moving with an initial velocity of 10 ms−1 and 5 ms−1 respectively. They collide with each other. After collision, they move with velocities 4 ms−1 and 9 ms−1 respectively. The time of collision is 2 s. Now calculate F1 and F2.

  • Question 55
    State and explain the defects of vision. How can these defects be rectified ? VIEW SOLUTION
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