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 3 & 5 MARKS SAMPLE PAPER 2

14.   (a)     Which  mirror do we use as a rear  view  mirror in vehicles  ?                                              

(b)    Draw  a ray  diagram to illustrate the  formation of an  image  when an  object  is placed anywhere in front  of the mirror on its Principal Axis.  State the nature and position of the image  formed.

15.   (a)     Define  dispersion of light.                                                                                                         

(b)   Draw  a ray  diagram to show  the  path  of a light  ray  that  enters  the  glass  prism obliquely.  Label on it the angle  of incidence and  angle  of deviation.

16.   A convex  lens  of focal length  2O cm is placed at a distance of 24 cm from  the  screen. How  far  from  the  lens  should an  object be placed so as to form  a real  image  on  the screen  ?  Also find  the nature and  magnification produced by the lens.

17.   (a)  Define  the  term  Functional group.  Identify the  functional group present in the following compounds :                                                                                                O

                                                      ||

(i)      CH₃ – CH₂  –  CH₂  – OH        (ii)  H – C – H

(b)  What will you observe on adding a 5% alkaline potassium permanganate solution drop by drop to some  warm ethanol taken  in a test tube  ? Write  the name  of the compound formed during the  above  chemical  reaction.

18.   Given  below  are four  elements with  their  atomic  numbers                                                   

Element       Atomic number

A                        16

B                         11

C                          3

D                        14

(a)     Identify the  elements which  belong  to the  qsame  group of the  Modern Periodic table.

(b)     Arrange the given  elements in decreasing order of atomic  size.

(c)     Write  the formula of the oxide  of B.

(d)     Which  of the above  elements is a metalloid ?

19.   What  are fossils ? List two  ways  by which  we can estimate the age of fossils.       

      

20.   What are sex chromosomes ?  What role do they play in determining genetically the sex of an individual in human beings  ?

21.   Why are some pea plants tall and  others  short  in nature ?  Explain  with  reference to the role of genes  in controlling characteristics.

22.   In the diagram of human male  reproductive system given  below  :                                           

(a)     Label parts  A and  B.

(b)     Name the hormone produced by organ ‘X’. What is the role of this  hormone in the  human male  ?

(c)     Mention the name  of substances that  are transported by tubes

(i)      C and          (ii)     D

23.   (a)     Define  1 dioptre of power. Find  the focal length  of a lens of power -2.0 D.               

(b)     Why  does  a lemon  kept  in water in a glass  tumbler appear to be bigger  than  its actual  size ?

(c)     Study  the table  given  below  and  state  the medium in which  light  ray will travel fastest. Why  ?

Medium                  A                B                C

Refractive Index                   1.33            1.5              2.4

OR

(a)     State  the  laws  of refraction.

(b)     What  is meant by the  term  absolute refractive index  ?   The speed of light  in a transparent medium is 0.6 times  that  the speed in vacuum.  Find refractive index of the medium.

(c)     How  should a ray of light be incident on a rectangular glass slab so that  it comes out  from  the opposite side  of the  slab  without being  displaced ?   Draw  a ray diagram to illustrate your  answer.

24.   (a)     Write  a chemical  equation for the combustion of Ethanol.                                            

(b)     List any  two  differences between saturated and  unsaturated carbon  compounds.

(c)     Draw  the structures of any  two  isomers of butane and  name  them.

OR

(a)     Draw  the  structure of Ethyne  (C₂H₂).

(b)     Define  Esterification.  Write  a chemical  equation to illustrate it.

(c)     List any  two  differences between soaps  and  detergents.

25.   (a)     Name  the female  reproductive part  of a flower. Draw  diagram of its longitudinal section depicting the process  of fertilization of pollen  on stigma  and label on it the following :

(i)      male germ  cell (ii)     female  germ  cell (iii)    Ovary

(b)     What  happens to the  following parts  after  fertilization ?

(i)      ovum        (ii)     ovary                     (iii)    ovule           (iv)    sepals  and  petals

OR

(a)     Draw  a neat diagram of the reproductive system of a human female  and  label on it the following :

(i)      reproductive part  that  produces the  female  hormone

(ii)     site of fertilization

(iii)    organ  where growth and  development of the embryo takes  place.

(b)     How  does  the growing embryo meet  with  its nutritional requirements ?

(c)     What  happens if the ovum is not fertilized ?

(d)     Mention a contraceptive method that  can be used  by the human female.

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.