X SCIENCE SA II 3 & 5 MARKS SAMPLE PAPER 1

QUESTION 14 TO 25 [ X SCIENCE SA II ] – SAMPLE PAPER 1

14.    A real  image,1/5 th the  size  of object is formed at a distance of 18 cm from  a mirror. What  is the nature of mirror ? Calculate its focal length.

15.    A ray of light  is incident obliquely on a glass  slab. Draw  a ray - diagram showing the path  of the  light  ray.  Clearly  mark  angle  of incidence, angle  of refraction, angle  of emergence and  lateral  displacement of the ray. Give a formula to find  refractive index of glass slab in terms  of angle  of incidence and  angle  of refraction.

16.    A person cannot  see objects farther than  12m from  the eye clearly.  Name  the, defect  of vision  he is suffering from and  the lens that should be used  for correction of this defect Illustrate with  the help  of a diagrams, how  this lens will correct  the defective vision.

17.    Give reasons for the following :

(a)     Unsaturated  hydrocarbons show   addition  reactions but   not  saturated hydrocarbons.

(b)     Carbon only  forms  covalent compounds.

18.    State modern periodic law. Mention the position of (i) hydrogen and  (ii) isotopes of same  element in the modern periodic table.

19.    Distinguish between analogous organs and  homologous organs. Identify the analogous and  homologous organs amongst the following :

        Wings  of an insect,  wings  of a bat, forelimbs of frog, forelimbs of human.

20.    Study  the given  data and  answer the questions that  follow  :

(a)     What  is the term  given  to this type  of cross ?

(b)     What  does  the data  in column 2 indicate ? State how  did  you  arrive  at this  conclusion.

110- Round Green

102- Wrinkled Yellow

32- Wrinkled Green

21.    Explain  with  the help  of flow chart  - “What  determines the sex of a child  genetically”       

22.    What  is the importance of D.N.A copying in reproduction ? Why is variation beneficial to the species  but  not necessary for the individual ? Explain.

23.    Draw  a ray  diagram in each  of the  following cases  to show  the  formation of image, when the object is placed :

(i)      between optical  centre  and  principal focus  of a convex  lens

(ii)     between F and  2F of a concave  lens

(iii)    At 2F of a convex  lens

What can you say about  sign and  value  of linear  magnification ratio in, (i) and  (ii) above.

OR

(i)      Define  real  image  of an object.                                                                                                 

(ii)     Name  the  mirror that                                                                                                      

(a)     can give real as well as virtual image  of an object.

(b)     will always give virtual image  of same  size of an object.

(c)     will always give virtual and  diminished image  of an object.

(d)     is used  by a doctor in examining teeth.

(iii)    With  the  help  of a ray  diagram explain  the  use  of concave    mirror as  solar  concentrators.

24.    Complete the  following reactions.

                                                                                           

OR

        (a)     List two  reasons for carbon  forming a large  number of compounds.

(b)     An  organic  acid  ‘X’ is a liquid which  often  freezes  during winter time  in cold countries. It has  molecular formula C₂H₄O₂.  On  warming with  ethanol in the presence of a few drops of conc. H₂SO₄  a compound Y with sweet smell is formed.

(i)       Identify X and  Y

(ii)     Write  chemical  equation for the reaction involved.

25.    (a)     What  is the role of seminal vesicles  and  the prostate gland ?

(b)     What  are the three  categories of contraception methods ? Write  briefly  about each.

OR

(a)     Draw  longitudinal section  of a flower  and  label on it the following : (i)        Ovary (ii)     Style                                 (iii)    Stigma        (iv)    Anther

(b) Why  is vegetative propagation practised for  growing some  plants ? Give  two examples of plants grown by this  method.

X SCIENCE SA II 1& 2 MARKS QUESTION SAMPLE PAPER 5

1.          What  is the range  of vision  of a normal human eye ?                                                                  

2.          Draw  the structure of the simplest ketone.                                                                                      

3.          In a certain  study conducted on occurrence of DDT along  food chains  in an ecosystem, the concentration of DDT in grass  was found to be 0.5 ppm (parts  per million),  in sheep it was 2 ppm  and  in man  it was 10 ppm.  Why was the concentration of DDT maximum in case of man  ?

4.          Why  has there  been  so much concern against the use of CFCs ?                                           

5.          Why  does  the clear sky appear blue ?                                                                                               

6.          Why  does  it take  some  time  to see the objects in a dim  room  when we enter  the room from  bright sunlight outside ?

7.          (a)     What  happens to a ray  of light  when it travels  from  one  medium to another having equal  refractive ndices  ?

(b)        State the cause  of refraction of light.

8.          How  has the use of fossil fuels led to the deterioration of environment ?  State any two reasons.

9.          (a)     State  Modern Periodic  Law.                                                                                                      

(b)     Why is  position assigned to hydrogen in Periodic  Table considered anomalous ?

10.       Account for the  following :                                                                                                                 

(a)     Elements of group l8 are called  zero  valent.

(b)     Elements in a group of periodic table  have  similar  chemical  properties.

With  the  help  of an  example explain  how  involvement of local  people can  lead  to efficient  management of forests.

11.       In what  respect is the human male  gamete different from  the female  gamete ?                     

12.       What  will  happen when :                                                                                                                    

 (a)     A mature Spirogyra filament attains considerable length  ? (b)     Planaria gets cut into  two  pieces  ?

X SCIENCE SA II- 1 & 2 MARKS QUESTIONS SAMPLE PAPER 4

1.              Name  the type  of compounds which  are used  as refrigerants and  in fire extinguishers  and  deplete the ozone  layer in the atmosphere

2.              Producers always occupy  the first trophic level in any  food  chain.   Why  ?                        

3.              Write  the value of near and far point  of distinct vision  for normal eye.                                           

4.              Draw  the  structure of Ethanol (C₂H₅OH)                                                                               

5.              Pre - natal sex determination has  been  prohibited by law.  State two  reasons.                    

6.              What  is placenta ?  State its any  two  roles during pregnancy.                                             

7.              List any  four  stakeholders which  may  help in the conservation of forests                                 

8.              (a)     Why  are coal and  petroleum  called fossil fuels ?                                                                  

(b)     Name  any  two  elements present in fossil fuels in addition to carbon.

9.              The refractive indices  of alcohol and  turpentine oil with  respect to air are 1.36 and  1.47 respectively.   Find the refractive index  of turpentine oil with  respect to alcohol. Which one of these  will permit the light to travel faster  ?

10.          Why do we observe difference in colours of the Sun during sunrise, sunset and noon  ?       

11.          Describe the formation of rainbow in the sky with  the help of a diagram.                          

12.          State the positions of (i) isotopes of the same  element and  (ii) hydrogen in the modern  periodic table.

13.          How  does  the  tendency to gain  electrons  change as we  go down the  16th  group of   periodic table ?  Why  ?

X SCIENCE SA II- 1 & 2 MARKS QUESTIONS SAMPLE PAPER 3

1.          Name the part of the human eye that helps  in changing the focal length  of the eye lens.      

2.          Write  the next higher homologue of the following :   (i)      C₃H₆O           (ii)     C₅ H₈

3.          Select the biodegradable wastes from  the following :   DDT, Crop’s  residue, Leather and  Glass

4.          In a food chain consisting of snake, insect, grass and frog, assign  an appropriate trophic level to frog.

5.          What is the cause  of dispersion of white  light passing through a prism  ?  Which colour of light deviates the -

(i)      most ;         (ii)     least

6.          Why does the  clear  sky  appear blue  ? How would the sky appear in the absence  of   earth’s  atmosphere ?

7.          How can you  identify the three  types  of mirrors without touching ?                                    

8.          An element has electronic configuration 2, 8, 3.   What is the atomic number of this element ? To which  

(i)  group and    (ii)  period this element belong  ?

9.          How  does  atomic  size vary  in a group from  top to bottom and  in a period from  left to  right  ? Explain.

10.       Name  those  parts  of a flower  which  serve  the same  function as the following do in the   animal  :-

(i)      Testis           (ii)     Ovary          (iii)    Eggs            (iv) Sperms

11.       What  are fossil fuels ? How are they  formed ?                                                                          

12.       What  is ozone  ? How  does  it protect the organisms on the Earth  ?                                         

13.       What  are sexually  transmitted diseases ?  Name  an STD which  damages the  immune system of human body  ?

X SCIENCE SA II - 1 & 2 MARKS QUESTIONS SAMPLE PAPER 2

1.          What  is the nature of the image  formed at retina  of human eye ?

2.          Why  do Carbon compounds not  conduct electricity ?

3.          What  is meant by biological  Magnification ?

4.          Why do food  chains  generally consists  of only three  to four  trophic levels.

5.          Why  do stars  seem  higher  than  they  actually are ?

6.          An  object  3 cm  high  is placed at  a distance of 8 cm  from  a concave  mirror which produces a virtual image  4.5 cm high  . What  is the  focal length  of the  mirror ?  Also find  the position of the image.

7.          A beam  of white  light falling on a glass prism  gets split up into 7 colours  marked 1 to 7 as shown in the diagram. A student makes  the following statement about  the spectrum observed on the screen  - The colours  at position 3 and  5 are  similar  to the  colour  of the  sky  and  the  core  of a hard boiled  egg respectively. Is the statement made by the student correct  or incorrect ? Justify.

8.          What are fossil fuels ? ” Burning of fossil fuels leads to acid rains”.  Justify this statement.

9.          The following table shows  elements represented by the letters  A , B , C , D , E , E , F , G, and  H.

Group        1        2        13      14       15     16       17     18

Element       A       B       C       D       E       F        G       H

(i)      Which  of the elements has  the atomic  size

(a)     biggest  and           (b)     smallest ?

(ii)     Which  element has  valency (a) 3 and  (b) zero  ?

10.       How  does  (a) metallic  character and  (b) atomic  size vary

(i) in a group and           (ii) a  period ?

11.       Forests  are ’ biodiversity hotspots’. Justify this statement.

12.       Explain  how the ovary function both as the reproductive organs as well as the endocrine glands ?

13.       How  does  bread mould reproduce ? Draw   a  diagram showing this  mode   of reproduction.

14.       (a)     What  happens when a ray  of light  strikes  the  surface  of separation between the two  media at right  angle  ?

(b)     Light enters  from air into diamond which  has a refractive index  of 2.42. Calculate the speed of light  in diamond. The speed of light  in air is 3 x10⁸ m/s.

15.       Name  those  parts  of a flower  which  serve  the same  function as the following do in the   animal  :-

(i)      Testis           (ii)     Ovary          (iii)    Eggs            (iv) Sperms

X SCIENCE SA II - 1 & 2 MARKS QUESTIONS SAMPLE PAPER 1

1.          What  is the function of pupil in human eye ?                                                                                

2.          Name  the products obtained on complete combustion of ethanol.                                      

3.          State any  one reason for the conservation of forest  and  wild  life.                                              

4.          Give the full form  of CFC.                                                                                                                    

5.        Draw  a neat  diagram to show  the refraction of a light  ray  through a glass  prism, and label on it the angle  of incidence, and  angle  of deviation.

6.      Where  should an object be placed in front  of a concave  mirror of focal length  20 cm so  as to obtain  real image  two  times  magnified ?

7.          Why  does  the  sun  appear reddish early  in the  morning ? Illustrate with  the  help  of a labelled diagram.

8.          Name  the type  of asexual  reproduction in :                                                                                   

(a)     Planaria    (b)     Rhizopus   (c)     Spirogyra            (d)     Hydra

9.          (i)      What  is common in the elements belonging to the same  period of periodic table ?   

(ii)     Why  are Chlorine and  Bromine  kept  in the same  group in the periodic table  ?

10.       An  element belongs to third period and  second group of the periodic table                          

(a)     State number of valence  - electrons in it.   (b)     Is it a metal  or a non  - metal  ?

(c)     Name  the element.                                                         (d)     Write  the formula of its oxide.

11.       (a)     Write  full form  of D.N.A                                                                                                            

(b)     Why  are variations essential for the species  ?

12.       Suggest  two methods by which  our consumption of coal and petroleum can be reduced.    

13.       Differentiate between :                                                                                                                         

(a)     Asexual  reproduction and  Sexual  reproduction. (b)     Self pollination and  Cross  pollination

14.       A needle placed 45 cm from  a lens  forms  an  image  on a screen  placed 90 cm on the  other side of the lens. Identify the type of lens. Determine its focal length  and the power. What  is the size of image  if , needle is 5 cm in height  ?

15.     A person wears spectacles of power - 2.5 D.  Name  the defect  of vision  he is suffering from.  Draw the  ray  diagram for

(i)      the defective eye                      (ii)     its correction after  using  a suitable lens

X MATHS SA II D SECTION SAMPLE PAPER 4

1.       The denominator of a fraction is one more  than  twice the numerator.  If the sum  of the fraction and  its reciprocal is     2-16/21 . Find  the  fraction.

2.       Prove  that  line joining centre of  the circle to pint of contact of a tangent is perpendicular .

3.       A two digit number is four times the sum of its digits.   It is also equal  to three  times the product of its digits.   Find  the number.

OR

The hypotenuse of a right  triangle is 3 root 5 cm.   If the  smaller  side  is tripled and  the larger  side is doubled, the new hypotenuse will be 15 cm.  Find the length  of each side.

4.       The surface  area of a solid metallic  sphere is 616 cm².  It is melted and recast into a cone of height  28 cm.  Find  the diameter of the base of the cone so formed.

5.       An aero plane flying  horizontally 1 km above  the ground is observed at an elevation of 60°.After  a flight  of 10 seconds, its angle  of elevation is observed to be 30° from  the same  point  on the ground.  Find  the speed of the aero plane in km/hour.

6.       A farmer connects a pipe  of internal diameter 20 cm from  a canal  into  a cylindrical tank  in his field, which  is 10 m in diameter and  2 m deep.   If water flows  through the pipe  at the rate  of 3 km/hour, in how  much  time  will the tank  be filled ?

OR

A container shaped like a circular cylinder having diameter 12 cm and  height  15 cm is full of ice-cream. The ice-cream  is filled  into  cones  of height  12 cm and  diameter 6 cm each having a hemispherical shape  on the top.   Find  the number of such  cones  which can be filled  with  ice-cream.