X SCIENCE SA II 3 & 5 MARKS SAMPLE PAPER 5

Q.No. 14 – 22 : 3 Marks each.

Q.No. 23 – 25 : 5 Marks each.

14.       State  in brief  the  function of the  following organs in the  human female reproductive system :

(a)     Ovary                    (b)     Fallopian tube                          (c)     Uterus

15.       State two reasons of launching  the  “Ganga Action  Plan”. Which bacteria were found in Ganga water indicating contamination?

16.       (a)     Define Heredity.                                                                                                             

(b)     Differentiate between inherited and acquired traits.

17.       The genotype of green stemmed tomato plants is denoted as GG and that of purple stemmed tomato plants is denoted as gg.  When these  two  are  crossed  with  each other  :-

(a)     What colour of stem would you expect in the Fl progeny?

(b)     Give the percentage of purple stemmed plants if Fl plants are self pollinated

(c)     In what ratio would you find the genotypes GG and gg in the progeny?

Draw flow chart in support of your answer.

18.       A point object is placed at a distance of 12 cm from a convex lens on its principal axis. Its image is formed on the other side of the lens at a distance of 18 cm from the lens. Find the focal length of the lens.  Is the image magnified?  Justify your answer.

19.       (a)    A compound lens is made of two lenses in contact having powers +12.5 D and – 2.5 D.  Find the focal length and power of the combination.

(b)     The magnification produced by a mirror is +1. What does this mean?

20.       A person is not able to see distinctly the object placed at large distances but is able to read the matter written on a book comfortably. Name the defect of vision he is suffering from. State two  causes  for this  defect With  the help of a ray diagram show  how  this  defect  can be corrected

21.       An element X belongs to group 17 and  third period of the periodic table                                

(a)     Write electronic configuration of the element.  What is its valency?

(b)     Predict its nature, whether it is a metal or a non - metal.

(c)   Give the formula of the compound formed when it combines with an element Y having valency three.

22.      (a)     Why are soaps not considered as effective cleansing agents?                                           

(b)     Write any two structural isomers of Pentane.  (C₅H_l2) and state their names.

23.       (a)     In the given  figure  name  the parts  marked 1 to 6 :-                                                            

(b)     Differentiate between Pollination and Fertilization.

OR

(a)     In the given figure name the parts marked 1 to 6:-

(b)     Differentiate between self pollination and cross pollination.

24.       Name  the type  of mirror used  in the following :                                                                             

(a)     Solar furnace.

(b)     Side/rear - view mirror of a vehicle.

Draw labelled ray diagrams to show the formation of image in each of the above two cases.

Which of these mirrors could also form a magnified and virtual image of an object? Illustrate with the help of a ray diagram.

OR

(a)     Draw a ray diagram in each of the following cases to show the position and nature of the image formed when the object is placed:

(i)     between optical centre and principal focus (F) of a convex lens. (ii)     Between F and 2F of a convex lens

(iii)    At 2F of a convex lens

(b)     How  will the  nature and  position of image  formed change in case (i) and  (ii) in part  (a) of this  question if the  lens is replaced  by a concave  lens ?   Draw the corresponding ray diagram.

25.       (a)     Complete  the  following reactions and  name  the  main  product formed in each  Case.

 (b)     Write chemical test to distinguish between Ethanol and Ethanoic acid.

OR

(a)     What is Esterification?  Give one example.

(b)     What happens when Ethanol is heated at 443 K with conc. H₂SO₄?

(c)     Differentiate between addition reactions and substitution reactions shown by Hydrocarbons.

X SCIENCE SA II 3 & 5 MARKS SAMPLE PAPER 4

14.    (a)     What  is meant by magnification in the context  of image  formation by mirror and  lenses  ?                                                                                                                                  

(b)     Power of a lens is + 5 D.  What  is the focal length  and  nature of the lens ?

15.    A person cannot  see objects less than  40 cm from  his eyes clearly. Name  the defect  of vision  he is  suffering from.   Calculate the  power of the  lens  he should use  to read  a book  at 25 cm distance from  his eyes.   Draw  a ray diagram for correction of the defect using  the lens.

16.    (a)     Draw  a labelled diagram to show  the refraction of light  through a glass  slab.             

(b)     Refractive  index  of the diamond is 2.42, what  does  it mean  ?

17.    Write  the name  of following compounds :                                                                                       

(a)     CH₃  CH₂-C ≡ CH (b)     CH₃  CH₂OH  (c)     CH₃COCH₃

18.    Two carbon  compounds A and  B have  the molecular formula C₃H₈  and  C₃H₆  respectively.

(a)     Which  one of the two is most  likely to show  addition reaction ?   Justify your answer.

(b)     Explain  with  the help  of chemical  equation, how  an addition reaction is useful in vegetable ghee  industry.

19.    Explain  in brief how  is the sex of a newborn individual genetically determined.                

20.    Illustrate Mendel’s experiment to show  that  traits  may  be dominant or recessive  by taking  tall/short plants as a character in garden pea.

21.    (a)     Distinguish between homologous and  analogous organs.                                            

(b)     State one evidence of organic  evolution.

22.    (a)     Why  is vegetative propagation practised for growing some  types  of plants ?              

(b)     Name  the different parts  of a flower  that  has  germ  cells.

(c)     List any  two  agents of pollination.

23.    Name  the type  of mirror (s) that  should be used                                                                             

(i)      as a rear  view  mirror

(ii)     by the dentists

Also draw ray diagram (s) and  mention the reason (s) for their  use.

OR

(a)     Name  the type  of lens that  can be used  as magnifying glass.   Give reason (s) and draw a ray  diagram to support your  answer.

(b)     Draw  ray diagrams to show  position and  nature of the image  formed by a

(i)      Convex  mirror when the object is at infinity. (ii)     Concave mirror when the  object is

(a)     at C             (b)     between F and  C

24.    (a)     Write  chemical  equation of the  reactions of ethanoic acid  with                                        

(i)      sodium      (ii)     sodium carbonate       (iii)    ethanol in  the  presence of Conc.H₂SO₄

(b)     State the  role  of concentrated sulphuric acid  in the  esterification reaction.

(c)     Write  one use  of ethanoic acid.

OR

(a)     Why  does  carbon  form  largest  number of compounds ?  Give two  reasons.

(b)     Why  are some  of these  called  saturated and  the other  unsaturated compound ?

(c)     Which  of these  two  is more  reactive and  why  ?

(d)     Draw  the  structures of the  following compounds

(i)      Bromopentane             (ii)     Hexanal

25.    Draw  a neat  diagram of the  human female  reproductive system and  label  the  parts which  perform the  following functions.

(a)     production of eggs  (b)     site of fertilization (c)     site of implantation (d)     entry  of sperms

What  happens when the egg is not fertilized ?

OR

(a)     State any  two  changes seen in girls at the time  of puberty

(b)     How  does  the embryo get nourishment inside  the mother’s body  ?  State in brief. (c)     List any  two  commonly adopted, contracepotive methods.

X SCIENCE SA II 3 & 5 MARKS SAMPLE PAPER 3

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

16.    (a)     For the same  angle  of incidence 45° , the  angle  of refraction in two  transparent  media;  I and  II is 20° and  30° respectively. Out of I and II, which medium is optically denser and why?

(b)     Light enters from air to diamond which has refractive index of 2.42.   Calculate the speed of light in diamond, if speed of light in air is 3.00 X 10⁸ m/s

17.    An organic compound A is widely used as a preservative in pickles and has a molecular formula C₂H₄O₂. This  compound reacts  with  ethanol to  form  a sweet  smelling compound B;

(a)     Identify the compound A.

(b)     Write the chemical equation for its reaction with ethanol to form compound B.

(c)     How can we get compound A back from B?

18.    (1)     The elements of the second period along with their atomic number in parentheses are given  below:

   B (5), Be (4), O (8), N (7), Li (3), C (6), F (9)

(a)              Arrange them in the same order as they are in the periodic table.

(b)              Which element has the (i) largest (ii) smallest atom?

(2)     Why does the atomic radius change as we move from left to right in a period?

19.    (a)     Draw  a flow  chart  to determine the characteristics of the progeny of a cross between Tall Pea plants with  Short  Pea plants showing

(i)      F1 Generation

(ii)     F2 Generation.

(b)     List the Dominant and Recessive characters.

20.    (a)     Differentiate between :                                                                                                              

(i)      Homologous organs and Analogous organs

(ii)     Pollination and Fertilization

(b)     What do fossils tell us about the process of evolution?

21.    Justify giving reasons how human male only is responsible for the sex of a new born child and female has no role in it.

22.    (a)     Explain giving examples how artificial selection has helped in the formation of newer varieties of caulis flower.

(b)     List the steps involved in the formation of new species.

(c)     How different races of human beings belong to the same species?

23.     (i)      Under what condition, a concave mirror produces a virtual and magnified image? Draw a labelled ray diagram to show the formation of image in the above case. Also state the position of object to produce magnified and real image.

(ii)     A ray of light moving along principal axis is falling on a concave mirror. Draw the path of reflected ray. Also state the values of angle of incidence and reflection in this case.

OR

(i)      Where should an object is placed in case of a convex lens to form an image of same size as of the object. Show with the help of a ray diagram the position and nature of the image formed.

(ii)     With the help of ray diagram, illustrate the change in position, nature and size of the image formed if the convex lens in case (i) is replaced by concave lens of same focal length.

(iii)    State the condition under which a light ray passes undeviated through a lens.

24.    (a)     Write chemical equations along with necessary condition for the following changes to take  place  :

(i)      Ethanol to Ethanoic acid.

(ii)     Ethanoic acid to Sodium acetate. (iii)    Methane to Chloromethane.

(b)     What is a homologous series of organic compounds?  Explain it with an example.

OR

(a)        Complete the following reactions stating the main products formed in each.

(i)       CH₃ – CH₂ = CH₂    +  H₂ 

(ii)     C₂H₅OH + NaOH →

(iii)    CH₃  COOH  + Na₂CO₃ →

(b)     Write  the  next  homologue  of  propanol (CH₃CH ₂CH₂OH)  and   Butanal (CH₃CH₂CH₂CHO)

25.    (a)   Draw  neat  labelled diagram of human female  reproductive system.                        

(b)  Name  one organ  each in the body  of Male and  Female  reproductive system that plays  a role of endocrine gland along  with  the production of germ  cells. Name one  hormone in each  case.

(c)   Name  the part  where the fertilization of gametes takes  place  and  also the place where the fertilized egg is implanted.

OR

(a)    Draw  a neat  labelled diagram of pistil  showing fertilization of pollen  on stigma.

(b)    Give the functions of : (i) stigma  (ii) ovary

(c)     State in brief the formation of seed  in a flower.

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