Question Paper for general practice
SCIENCE
(THEORY)
Time: 3 hrs Max.marks:
80
General
Instructions:
i)
The question
paper comprises of two sections, A and B. You are to attempt both the sections.
ii)
All
questions are compulsory.
iii)
There is no
over all choice. However, internal choice has been provided in all the three
question of five marks category. Only one option in such question in to be
attempted.
iv)
All
questions of section A and all questions of section B are to be attempted
separately.
v)
Question
numbers 1 to 4 in section A are one mark questions. There are to be answered in
one word or one sentence.
vi)
Question
numbers 5 to 13 are two mark questions, to be answered in about 30 words each.
vii)
Question
numbers 14 to 22 are three mark questions, to be answered in about 50 words
each.
viii)
Question
numbers 23 to 25 are five mark questions, to be answered in about 70 words
each.
ix)
Question
numbers 26 to 41 in section B are multiple choice questions based on practical
skills. Each question is a one mark question. You are to select one most
appropriate response out of the four provided to you.
SECTION
– A
1.
What are the
3 R’s to save the environment?
2.
Define 1
dioptre of power of a lens.
3.
Name two unisexual flower.
4.
Draw the
electron dot structure of C2H6.
5.
Why is a
normal eye not able to see clearly the objects placed closer than 25 cm?
6.
Name two
other elements which are in the same family as (i) carbon (ii) sodium.
7.
What do you
mean by STD? Name one STD each caused by bacteria & virus.
8.
Give any two ways in which biodegradable substances would affect the environment.
9.
Why do stars
twinkle?
10. What
do you mean by acquired traits & inherited traits?
11. How
would you bring about the change (i) ethanol to ethene (ii) propanol to
propanoic acid?
12. Define
magnification of a spherical mirror. What will be the magnification in case of
a plane mirror?
13. What
are fossils? What do they tell us about the process of evolution?
14. Why
should we conserve forests and wild life?
15. The
near point of a hypermetropic person is 50 cm. What should be the focal length
and power of the lens used by him if he wants to read a newspaper placed 20 cm
away?
16. Explain
double fertilisation in flowering plants.
17. What
is esterification? Write the reaction involved. Write one use of ester.
18. Light
enters from air to glass having refractive index 1.50. What is the speed of
light in the glass? The speed of light in vacuum is 3x 108 m/sec.
19. In
human beings blue eye colour is recessive to brown eye colour. A brown eyed man
has a blue eyed mother.
(a)
What is the
genotype of man & his mother?
(b)
What are
possible genotypes of his father/
(c)
If the man
marries a blue eyed woman, what are the possible genotypes of their offspring?
20. (a) Why does carbon form compounds mainly
by covalent bonding?
(b) List any two reasons for carbon forming
a very large number of compounds.
21. (a) What is scattering of light?
(b) Explain why does dangerous signals
are made up of red or orange colours?
(1+2)
22. Answer the following: (1/2
X 6=3)
(i) Who proposed the theory of Inheritance
of Acquired Characters/
(ii) Who first suggested that ‘organisms never originate
spontaneously from non Living’?
(iii) Who wrote the book “Origin of
species”?
(iv) What is the process of gradual change from simple to
complex organisms?
(v) What is sudden inheritable change called as?
(vi) What the technical term for the resemblance of colour of
animals with surrounding environment?
23. Draw a diagram to show that formation
if image of a distance object of myopic eye.
How can this defect be
rectified? State two reasons due to which this
defect may be caused?
OR,
What is hypermetropia? Draw a
ray diagram to show the image formation of an object by: (i) Hypermetropia eye
(ii) Correction made with suitable
lens.
24. (a) How does the creation of
variations in a species promote survival?
(b)
How is the sex of a child determined in human beings?
OR,
Explain
the terms:
(a)
Homologous
organs with examples.
(b) Analogous
organs with examples.
(c) Genotype
(d) Phenotype
(e)
Genetic
drift
25. An
element is placed in second group and third period of the periodic table, burns
in presence of oxygen to form a basic oxide.
(a)
Identify the element.
(b)
Write the electronic configuration.
©
Write the balanced equation when it burns in the presence of air.
(d)
Write the
balanced equation when this oxide is dissolved in water.
(e)
What will be
the nature of the solution thus obtained.
OR,
Atomic
number of a few elements is given below:
10,
20, 7, 14.
(a)
Identify the
elements.
(b)
Identify the
group number of these elements in the periodic table.
(c)
Identify the
periods of these elements in the periodic table.
(d)
What would
be the electronic configuration for each of these elements?
(e)
Determine
the valency of these elements.
SECTION
– B
26. According
to Snell’s law:
(a) < i = < r (b) sin
i α sin r
© sin i α 1/sin r (d) sin
i = µsin r
27. A
ray falls normally on a surface, it will :
(a) Bends inwards (b) bends
outwards
© pass straight (d) retrace back.
28. A
ray goes from an optically denser to an optically rarer medium, it ;
(a) passes straight (b) bends towards normal
© bends away from normal (d) will
go parallel to incident ray
29. divergent
lens is :
(a) of uniform thickness (b) thicker at centre , thinner at edges
(
c) have positive focal length (d) thicker
at edges, thinner at centre
30. Lateral
displacement suffered in a slab of thickness is:
(a) α 1/t (b) α 1/t2
( c) α t2 (d) α t
31. What happens when copper is added to
zinc sulphate solution?
( a) the solution becomes colourless and zinc metal gets
deposited
( b) no reaction takes place as copper is less reactive than
zinc
( c) no reaction takes place as copper is more reactive than
zinc
( d) the solution remains blue and zinc metal gets deposited.
32. Can we store copper sulphate in iron
container and why?
( a ) no, because iron is more reactive than copper, therefore
reaction will take place.
(b) No, because copper is more reactive than iron
(c ) yes, because copper is more reactive than iron
(d) yes, because copper is less reactive than iron.
33. When sodium carbonate is added to
acetic acid, CO2 is produced. The other product of the reaction is /are:
(a) sodium acetate & water (b) water only
( c) sodium acetate only (d) none of these
34. Vinegar is :
(a) 5 - 8 % acetic acid (b) acetic acid of any concentration
(c) 100% acetic acid (d) 50% acetic acid
35. Acetic acid and water are mixed in a
test tube, the resultant solution will be:
(a) clear solution (b) turbid solution
( c) acid forms lower layer (d) water forms lower layer
36. Budding involves growth of new
organisms:
(a) outside the parent body (b) on the parent body
( c) inside the parent body (d) both (a) & (c)
37. Which of the following is not a mode
of asexual reproduction?
(a) Multiple fission (b) binary fission
( c) spore formation (d) conjugation
38. Multiple fission occurs in :
(a) Euglena (b)
Yeast
( c) Plasmodium (d) Paramecium
39. Clones are the individuals which are
produced by:
(a) Asexual reproduction (b) sexual
reproduction
( c ) Both of these (d)
None of these
40. In
Yeast budding takes place by the following steps:
(i) The bud may become separate from
the parental body and develop into a new individual
(ii) Thus they may form a colony
(iii) A bud comes out in any direction from
the parental cell
(iv) The body bud develops and give rise
to another baby bud
The proper sequence of steps is:
(a)
(iii), (i),
(iv), (ii)
(b)
(i), (ii),
(iii), (iv)
(c)
(iii), (ii),
(i), (iv)
(d)
(ii), (iii),
(iv), (i)
41. The
shape of amoeba is :
(a) round (b) oval (
c) irregular (d) rod
like
MARKING
SCHEME
1.
Reduce,
recycle, reuse. 1
2.
A lens of
focal length 1m. 1
3.
Papaya &
watermelon flowers ½
+ ½
4.
NCERT
Fig.No. 4.6 1
5.
Because
ciliary muscles cannot contract beyond a certain limit. 2
6.
(i) carbon-
silicon, Germanium. 1+1
(ii)
sodium-lithium, potassium.
7.
Sexually
transmitted disease. (i) Gonorrhoea/Syphilis. (ii) warts /Aids 1+1
8.
(i) It
converts wastes into CO 2 .
(ii)
Increase in the number of micro-organism that gives unhealthy environment.1+1
9.
Due to
atmospheric refraction of light or apparent change in the position of the stars.2
10. Inherited:
Which run in the family/transmitted from parents to progeny.
Acquired: Acquired In the life time of an
individual 1+1
11. (a) CH3CH2OH —› CH2=CH2 + H2O
(b) CH3CH2 CH2OH —›
CH3CH2COOH 1+1
12. Magnification,
m= size of image/size of object
For
plane mirror, m= +1 1½
+1/2
13.
Fossils/
remains of dead organisms of the past
It
tells us about their existence on the earth. 1+1
14. Forests
provide food, medicine, fire wood, maintain balance of gas, water & prevent
flood and soil erosion.
Wildlife
helps in maintaining Food Chain, provide wool, bones, skins etc. 1 1/2x 2
15. u= -20 cm, v = - 50 cm, f =?
Lens
formula
1/f
= 1/v – 1/u
Put
the value, f = 100/3 = 33.3 cm
P
= + 3D
Lens
-Ã
converging/convex 1+1+1
16.
Double
fertilization= (i)Syngamy(One male +One
female gamete/ovum) , (ii) Triple fusion(2nd male gamete + polar
nuclei ) 1
½ x 2
17. When
an acid is heated with an alcohol in the presence of conc. H2SO4
an ester is produced eg
CONC.H2SO4
CH3COOH
+ C2H5OH ↔ CH3COOC2H5
Ester
is used as flavouring agent. 1+1+1
18. Refractive index n = speed of
light in air(c)/speed of light in glass (v)
1.5
= 3x108/v
V
= 3x108/1.5
V
= 2x108 m/s 1+1+1
19. (a) Genotype of man: Bb/Heterozygous; Genotype of mother:
bb/homozygous recessive
(b) Possible genotype of father:
Bb/Heterozygous or, BB/Homozygous dominant
© 50% blue eyed, 50% Brown eyed;
1:1/test cross 1+1+1
20. a) Since carbon has four valence
electrons and a very large amount of energy is required to loose or gain four
electrons
b) Catenation – Self linkage ability, tetra valency, isomerism. 2+1
21. a) When a ray of light falls on
the particles of atmosphere then ray of light get scattered in all directions
this is called scattering of light.
b)
The light of red colour scattered least due to its large wavelength so red
colour of light passes through smoke, fog or dust and can be seen easily from
distant point. 1+2
22. i) Lamark ii) Louis Pasteur iii) Charles Darwin iv) Evolution
v) Mutation vi) Camouflage. 1/2
x6
23. NCERT
Fig 11.2, (b) & (c); using concave lens of suitable power; causes- (i)
excessive curvature of eye lens, (ii) elongation of eye ball. 3+2
OR,
Correct definition; NCERT Fig. no.
11.3 (b) & (c). 1+2+2
24. a)The useful variation in
individual of a species will enable them to adapt according to the changes and
new needs. Thus they will enable the survival of species.
b)
There are 23 pairs of chromosomes in which 1 pair is sex chromosomes. These sex
chromosomes are again of two types i.e., ‘x’ and ‘y’ chromosomes. When a child
bears 22 pairs + x + y ,it will be male and the child bearing 22 pairs of
autosomes along with ‘x’ pair of sex chromosomes will be female.
Diagram-NCERT figure no.9.6 2+3
Or
a)
Homologous
organs-Organs of different classes having similar origins and structures but
perform different functions.
b) Analogous
organs-Organs similar in functions but different in structure and origin.
c)
Genotype-Internal
genetic constitutions of an organisms.
d) Phenotype-Externally
visible characters of an organisms.
e)
Genetic
Drift-It is a change of gene frequency from one generation to another. 1X5
25. a)
Magnesium
b)
2, 8, 2
c)
2Mg(s) + O2 (g) → 2MgO(s)
d)
MgO(s) + H2O (l) → Mg(OH)2(aq)
e) Alkaline/Basic 1x5
26. (d)
27. (d)
28. ©
29.
(d)
30. (d)
31.
(b)
32. (d)
33. (a)
34. (a)
35. (a)
36. (d)
37. (d)
38. ©
39. (a)
40.
(a)
41. ©
