10TH STANDARD PUBLIC SCIENCE IMPORTANT QUESTIONS

                 SCIENCE

                               SECTION - I

                                               (MARKS: 15)

Note: (i) Answer all the 15 questions.

          (ii) Choose the correct answer from the four alternatives given

               in the brackets.

1. Which of the following is inheritable?

    (An altered gene in sperm, an altered gene in testes, an altered gene in

    Zygote, an altered gene in udder cell)

2. Somatic gene therapy (affects sperm, affects egg, affects progeny, affects

    Body cell)

3. Pick out the bacterial disease.

    Meningitis, Rabies, Tetanus, Small pox.

4. The most serious form of malaria is caused by Plasmodium ________.

    P.ovale, P.malariae, P.falciparum, P.vivax.

5. The first vaccine injected into a just born baby is ___________.

   Oral polio, DPT, DPT and Oral polio, BCG.

6. One of the means of indirect transmission of a disease is _____.

    Sneezing, Droplet from mouth, Placenta, Utensils of patients.

7. Spinal nerves are ________.

    Sensory nerves, Motor nerves, Mixed nerves, Innervating the brain.

8. The “T” lymphocytes are differentiated to resist infection in

      _____. (Parathyroid gland, lymph gland, thymus gland,

     Adrenal gland).

9. The part of brain which controls emotional reactions in our body is

     ____. Cerebellum, Cerebrum, Thalamus, Hypothalamus.

10. in sexual reproduction of flowering plants,

   The first event involved in this is.

    (Fertilization, germination, regeneration, pollination)

11. The mango fruit is called as stone fruit. Because it has.

     (Skinny epicarp, stony mesocarp, fleshy endocarp, hard endocarp)

12. The product of triple fusion which acts as nutritive tissue for the

      development of embryo is (zygote, placenta, scutellum, endosperm)

13. Normal body temperature of man is __________.

      98.4 – 98.6oF, 96.6 – 96.8oF, 94.4 – 98.6oF, 98.4 – 99.6oF.

14. In monotropa the special type of root which absorbs nourishment is

      (Haustoria, Mycorrhizal root, Clinging root, Adventious root)

15. The autrotropic nutrition requires (CO2 and water, chlorophyll,

      sunlight, all     the  above)

16. Odd one out.

     (Plants, grasshopper, frog, tiger, snake)

17. Example for fossil fuel is

      (Copper, iron, magnesium, coal)

18. Which of the following constitute a food chain?

      (Grass, wheat and mango; Grass, goat and human; Goat, cow and

   Elephant; Grass, fish and goat)

19. The mixture of gases used by deep sea divers is _______

    (Helium-    oxygen, oxygen-nitrogen)

20. Earth soil cannot store more nitrogen than it can hold.

   Hence earth   soil is referred to be in a state of _________.

     (saturation, unsaturation)

21. From the given examples, form the pair of isotopes and

   The pair of isobars

        18Ar40, 17Cl35, 20Ca40, 17Cl37

22. Zn + 2HCl → ZnCl2 +H2 ↑

     The above reaction is an example of

     a) Combination reaction

   b) Double displacement reaction

   c) Displacement reaction

   d) Decomposition reaction.

23. pH = - log10 [H+]. The pH of a solution containing hydrogen

   Ion concentration of 0.001M solution is _____( 3 / 11 / 14)

24. When aqueous solution of silver nitrate and sodium chloride

    are mixed   _______

    Precipitate is immediately formed (white / yellow / red).

25. Gold does not occur in the combined form. It does not

    React with air (or) water. It is in ______. (native state /

    Combined state)

26. An element which is an essential constituent of all

    Organic compounds belong to _________ group.

       (14th group / 15th group)

27. Buckminster Fullerene is the allotropic form of

    (Nitrogen / Carbon / Sulphur)

28. IUPAC name of first member of alkyne is ……………

    (ethene / ethyne) 

29. One light year is equal to -----------

        ( 365.25 x 24 x 60 x 60 x 3 x 108 m , 1 x 24 x 60 x 60 x 3 x 08 m ,

         360 x 24 x 60 x 60 x 3 x 108 m )

30.  Screw gauge is used to measure the

    Diameter of --------

       (Crow bar, thin wire, cricket ball)

31. The acceleration in a body is due to ___________.

   (balanced force, un-balanced force, electro static force)

32. The weight of 50 kg person at the surface of earth is ________.

   (50 N, 35 N, 380 N, 490 N)

33. The physical quantity which is equal to rate of change of momentum is

    (Displacement, acceleration, force, impulse)

34. Two electric bulbs have resistances in the ratio 1 : 2.

    If they are joined in series, the energy consumed in these

    Are in the ratio _________.(1 : 2, 2 : 1, 4 : 1, 1 : 1)

35. The atomic number of natural radioactive element is _________.

      (Greater than 82, less than 82, not defined, at least 92)

36. An object is placed 25 cm from a convex lens whose focal length is

       10 cm.  The image distance is ________. (50 cm, 16.66 cm,

    6.66   cm, 10 cm)

                                                                    SECTION – II

Match the following vitamins with deficiency disease :

A	B	C
Vitamins	Deficiency                diseases	Symptoms
Vitamin A	Nyctalopia	Night Blindness
Vitamin B1	Scurvy	Nerbvous disorder
Vitamin C	Rickets	Bleeding Gum
Vitamin D	Haemorrhage	Defective   calcification of bones
Vitamin K	Beriberi	Profuse loss of    blood

 2.  Sexually reproducing organisms produce offsprings with marked,

     significant and visible variation. Asexually reproducing offsprings

         show minor variations.

         a) Do you agree with the above statements?

         b) Among the following organisms list out the asexually reproducing

         organisms. (Paramoecium, Euglena, Earthworm and Bird).

3.   Bio-technology , the modern science in biology, has helped in producing

      different types of products. One of the following group does not

       have a product of bio-technology. Pick out and give reasons.

       a) Enzymes, Organic acids, Steroids, Vaccines

       b) Vaccines, Enzymes, Anti biotics, Organic acids

       c) Anti biotics, Hormones, Steroids, Vaccines

       d) Steroids, Enzymes, Anti bodies, Vaccines. 

4.    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.

5.      Ramya is suffering from bleeding gum and loosening teeth.

     On a   diagnosis, it was found to have been caused by

   Vitamin deficiency.

 6. Copy the diagram and label any two parts in the group given.

7. This diagram is human brain, and the functions of different parts are given

     Below.

   

  Mark A and B in the parts of the brain, Corresponding with the function

8.  Pick out the item which has sequential arrangements

     a. zygotene -> Leptotene -> Pachytene -> Diplotene -> Diakinesis

     b. Diakinesis -> zygotene -> Leptotene -> Pachytene -> Diplotene

     c. Leptotene -> zygotene -> Pachytene -> Diplotene -> Diakinesis

9. Correct the statements if they are wrong.

    a .alpha cells produce insulin and beta cells produce glucagon

    b. cortisone suppresses the immune response

    c. thymus gland is a lymphoid mass.

    d. Ovary produces eggs and Androgen..

 10. The methods of reproduction and the organisms are given below.

   Match the type of reproduction to the suitable organisms.

    

Fission	Spirogyra	Yeast
Budding	Protozoans	Flatworms
Fragmentation	Bryophyllum	Bacteria

11. Redraw the diagram and label the following parts.

      a) Exine b) Tube nucleus

12. In balsam plant the seeds fall off far away from the mother plant.

      a) Is this statement correct or incorrect?

      b) Give reason.

13. One of the following groups contains a non mammalian animal.

      Pick up the group.

      a. dolphin, walrus, porcupine, rabbit, bat

      b. elephant, pig, horse, donkey, monkey

      c. antelope, deer, cow, buffalo, black buck

      d. dog, cat, crocodile, lion, tiger

14.    Redraw the diagram and label the following parts

       

                                         

15.     Redraw the diagram and label the following parts

 

16.     Match the methods of nutrition of special organs with suitable examples  

Autotrophs	Mycorrhiza	Cuscutta
Parasites	chlorophyll	Monotropa
Saprophytes	Haustoria	Hibiscus

17. Sugar is converted into alcohol. From the above statement what kind of

      Process takes place? Which micro organism is involved?

18. Pick out the odd one: The parts of the alimentary canal are

     (Pharynx, mouth, buccal cavity, pancreas)

19. Study the food chain. Paddy -> Mouse -> Snake -> Kite

      If the producer has a STORED UP ENERGY OF 500 k CAL. How much

      Of it goes to the organism at the third trophic level get from it?

    

20.  Study the illustration and answer the question.

       a. which line (A or B) represent the flow of energy?

    Why do you say so?

       b. Give an example of a decomposer.

21. Match the suitable renewable and non-renewable 

Sources	A	B	C
Renewable	Coal	Wind	Petroleum
Non-renewable	Hydrogen	Natural gas	Solar energy

22 A non renewable resource is a natural resource if it is replaced by natural

     process at a rate comparable or faster than its rate of consumption

     by  humans.

  Read this statement and confirm whether it is correct or incorrect. If it is

     incorrect give correct statement.

23. Distinguish between the saturated and unsaturated solution

    using the data given below at a temperature of 25oC

    A. 16g NaCl in 100g water

    B. 36g NaCl in 100g water  

24. Find the concentration of solution in terms of weight percent if

      20 gram of common salt is dissolved in 50 gram of water.

25. You are given the values of mass of one volume of oxygen

    gas and the mass of one volume of hydrogen.

    By applying Avagadro’s law how will you establish the

    relation between vapour density and molecular mass of a gas?

26. The pH values of certain familiar substances are given below

   

substance	PH Value
Blood	7.4
Baking soda	8.2
Vinegar	2.5
Household                       ammonia	12

analyse the data in the table and answer the following questions

a) Which substance is acidic in nature?

b) Which substances are basic in nature?

27. Why does the colour of copper sulphate change when an iro

      nail is kept in it? Justify your answer.

28. Assertion: Greenish layer appears on copper vessels

   if left uncleaned. Reason: It is due to the formation

   of layer of basic copper carbonate

     Give your correct option.

     a) assertion and reason are correct and relevant to each other

     b) assertion is true but reason is not relevant to the assertion

29. Assertion In thermite welding, aluminium powder and Fe2O3 are

   used. Reason Aluminium powder is a strong reducing agent. Does the

     reason satisfy the assertion?

30. Diamond is the hardest allotrope of Carbon. Give reason

   For its hardness.

31. An organic compound (A) is widely used as a preservatives

    In pickles and has a molecular formula C2H4O2. This

    Compound reacts with ethanol to form a sweet

    Smelling compound (B).

   (i) Identify the compound A and B.

   (ii) Name the process and write corresponding chemical equation.

32. Least count of a screw gauge is an important concept related

    to screw gauge. What do you mean by the term?

        Least count of a screw gauge.

33. Match the items in group A with the items in group B

Group-A	Group-B
Small dimensions	Kilo meter
Large dimensions	Screw gauge
Long distances	Scale
Small distances	Light year
	Altimeter

34. Correct the mistakes, if any, in the following statements.

    a. One Newton is the force that produces an acceleration of

            1 ms-2 in an object of 1 gram mass.

    b. Action and reaction is always acting on the same body.

35. From the following statements write down that which is not?

    Applicable to mass of an object

    a. It is a fundamental quantity

    b. It is measured using physical balance.

    c. It is measured using spring balance.

36.  Correct the mistakes, if any, in the following statements.

    a) A good source of energy would be one which would do

       a small amount of work per unit volume of mass.

    b) Any source of energy we use to do work is consumed and

       Can be used again.

37. You know that myopia is a common refractive defect of vision.

    Person with this defect can see only nearby objects clearly. Using

    Concave lens of suitable power this defect is corrected.

a)    Mention other two types of defects like this.

b)    Explain how we can correct it.

38. What is called heredity?

39. What is called monohybrid cross?

40. Define phenotype?

41. Define genotype?

42. Match the following:

BCG	Tuberculosis vaccine
DPT	Diphtheria,Pertussis,Tetanus,vaccine
MMR	Mumps,Measles,Rubella
DT	Diphtheria,tetanus
TT	Tetanus toxoid

                                                                     

43. What is antigens?

44. What is called natural active acquired immunity?

45. Match the disease and causative agents.

      I) Influenza                  a) Human rhino virus

     ii) Common cold           b) H1 N1 Virus

    iii) Tuberculosis             c) Microsporum

    iv) Ring worm                d) Mycobacterium

46. Match the column A with column B

              A                                 B

      1. Current                      a)  Volt

      2. Electric Potential       b) Ohm

      3. Resistance                c) Watt

      4. Electric Power           d) Ampere

47. Calculate the number of moles in 24.092 * 10power 22 molecules of water

48. Match the column A with column B

               A                                         B

     i) Fossil fuel                        a) cow dung

    ii) Hydro Power Plant          b) Heat

   iii) Bio-Mass                         c) coal

   iv) Thermal power plant       d) water

49. We see rainbow in the sky sometimes after the rain

   (a) what is a spectrum?

   (b) write the sequence of colours in a spectrum.

50. Match the following.

           i) Garden  pea plant             a) Dolly

          ii) Mono hybrid cross             b) Vaccine

         iii) Edward jenner                   c) 3:1

         iv)Dr. Ian Wilmut                    d) Pisum sativum

                                                              SECTION III

                                                                 PART -  I

1. a) What is genetic engineering?

b) What are the uses of Genetic engineering?

2. (a) Vaccine is to prevent the body from diseases. Suggest the

          Immunization schedule for the baby in the first six months.

(b)    What are all the disease that can be prevented as per the schedule?

3. Human evolution has a record of changes for the past of 15 milion

    years.

    a) Name the different species of mankind in chronological order

        from primitive to modern man.

    b)When were the primitive caves developed.?

    c) Narrate the life led by early man like hominids.

4. Kala has delivered a baby,

    a. Suggest the immunization schedule for the baby, in the

    first six months

    b. What are all the diseases that can be cured as per the schedule?

5. Compare aggregate fruit with multiple fruit with suitable examples

6.      Describe the structure of dicot seed.

7. a) Write the two events involved in the sexual reproduction of

     flowering plant.

  b) Discuss the first event and write the types

   c) Give advantages and disadvantages of that event.

8. Is the pressure created in xylem enough to conduct water in tall trees.

   Give reasons.

9. Compare the respiration in higher plants with the respiration in lower

     Plants

10. Smoke, smoke everywhere smoke. Do you agree this situation?

      Is good for health. List out the harmful effects of coal burning.

11. In your area there is scarcity of water due to this the people are affected.

12. Differences between atom and molecule

13. Factors influencing the rate of the chemical reaction?

14.a) List out the classification of acids

     b) list out the uses of acids?

15.a) Differences between minerals and ores

     b) List out the uses of aluminium

17.   Iron reacts with con. HCl and con.H2SO4. But it does

    not react  with con. HNO3. Suggest your answer with

       proper reason.

18.   X is a silvery white metal. X reacts with oxygen to form Y.

      The same compound is obtained from the metal on reaction

      with steam with the liberation of hydrogen gas. Identify X and Y.

19. Write the common name and IUPAC name of the following.

     a) CH3CH2CHO b) CH3COCH  C) CH3 – CH - CH3 d) CH3 COOH OH

     e) HCHO

20. Newton’s first law of motion gives a qualitative definition

   of force. Justify.

b) The figure represents two bodies of masses 10 kg and 20 kg and

     moving with an initial velocity of 10 ms-1 and 5 ms-1 respectively.

  They are colliding with each other. After collision they are moving

    with velocities 12 ms-1 and 4 ms-1 respectively. The time of collision

    be .2 s. Then calculate F1 and F2.

21.

1. (b) The retractive index of diamond is 2.42. What is the meaning

            of this  statement in relation to speed of light?

         

2. a) Re draw the above diagram.

   b) This diagram represents _________

   c) Label the parts of the diagram.

   d) Write the principle of the name of the

      device denoted by this diagram.