Sample Paper of Science
Section-A
1. In an experiment, saliva is added to a test tube containing fine powdered bread pieces . Comment on the result obtained from this experiment ?
2. Define lateral inversion .
Or
What is the angle of an equilateral prism?
3. What will be the phenotypic expression of dominant character in the F1 - generation in Mendel experiment ?
4. Define one ampere .
5. What type of material should be used for making a strong electromagnet ?
6. From where the developing embryo gets it's nourishment from the mother ?
Or
Malarial parasite exhibit which type of asexual reproduction ?
7. What will be the colour of the sky when it is observed from a place in the absence of any atmosphere?
8. Arrange the following elements in the order of decreasing size.
Na, Al, P, S, Cl , Mg ,Si
Or
Find the period and group of the elements whose atomic number is 12.
9. List two difference between 'holozoic nutrition' and 'saprophytic nutrition'. Give two examples of each.
Or
Point out two differences between artery and vein.
10. Why sodium carbonate is a basic salt ?
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11. Give an example , which represents a chemical change and not a physical change ?
Or
Define combination reaction.
12. Why are green plants called 'producers' ?
13. Give an example of a phenomenon , where Tyndall effect can be observed.
Or
The extent of deviation of a ray of light on passing through a prism depends on the colour . Give reason.
Assertion -Reason Type Questions
(Q .nos . 14-16)
In each of the following questions,a statement of assertion is given by the corresponding statement of reason. Of the statements, mark the correct answer as
a)if both assertion and reason are true and reason is the correct explanation of assertion.
b) if both assertion and reason are true but reason is not the correct explanation of assertion.
c) if assertion is true but reason is false.
d) if assertion is false but reason is true.
14. Assertion :- The traid N ,P and As will not represent the Dobereiner's triad .
Reason :- because there is so much difference in their atomic masses.
15. Assertion :- ozone present in the higher level of atmosphere is a product of of UV radiations acting on oxygen.
Reason:- ozone molecules are reactive and combined with free oxygen atoms to form more ozone molecules.
16. Assertion :- Heater wire must have high resistance and high melting point .
Reason :- Heating element of electric heater made of nichrome.
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Case study from question 17 to 20.
17. An element M with electronic configuration (2,8,2) combines separately with ( NO3 )^- , (SO4)^2- and (PO4)^3- radicals.
i. To which group and period of the modern periodic table does the elements M belongs ?
a) 2nd group ,3rd period.
b) 3rd group, 2nd period.
c) 4th group, 3rd period.
d)3rd group,4th period.
ii. Choose the correct match .
A 1M. i. 2(NO3)^-
B. 2M. ii. 2(PO4)^3-
C. 3M. iii. 1(SO4)^2-
a)A-ii ,B- iii, C -i
b)A-i, B-iii, C-ii
c)A- iii,B- i,C-ii
d)A-i, B-ii, C -iii
iii. Which is the correct statement ?
a)Along a period and down the group ,atomic radii decreases .
b) Along a period and down the group ,atomic radii increases.
c)Along a period ,atomic radii increase and down the group ,decreases.
d)Along a period ,atomic radii decreases and down the group , increases.
iv. Which is the correct increasing order of M ,M^+, M^2+ for size ?
a)M< M^2+<M^3+
b)M^3+<M^2+<M
c)M< M^3+< M^2+
d)M^3+<M< M^2+
v. Will M forms compounds ?
a) Covalent
b) Ionic
c)Neutral
d)None of these
18.The following table gives different positions of images and their sizes for different positions of objects in case of image formation by convex lens.
i. The nature of the image , if an object is placed at infinity is
a) real and erect
b) virtual and erect
c) real and inverted
d) virtual and inverted
ii. If the magnification of converging lens is +1 ,then image formed is
a) real inverted and of the same size as that of the object.
b) virtual erect and of same size as that of the object.
c) real inverted and bigger than the size of the object.
d) virtual erect and bigger than the size of the object.
iii. Prachi determined the focal length of a device X by focusing a distant object on the screen as shown in the following diagram.
Select the correct statement from the following:-
a) device X is a concave mirror and distance D is its focal length.
b) device X is a concave mirror and distance is its radius of curvature.
c) device X is a convex lens and a distance D is its radius of curvature.
d) device X is a convex lens and distance is its focal length.
iv. The focal length of a lens for an object placed 50 cm from the lens producing virtual image at a distance of 10cm in front of the lens will be.
a) 12cm
b) -12.5cm
c) -5cm
d) 5cm
v. The lower half of a convex lens is covered with black paper ( as shown in figure).The effect on the image on the screen would be.
a) the lower half of the image disappears.b) the upper half of the image disappears.
c) the image remains the same.
d) the image becomes less brighter than before.
19. Gregor Mendel, conducted the hybridization experiments by applying statistical analysis and mathematical logic. The confirmation of his inferences from experiments on successive of generation of his test plants,prove that his results pointed to general laws of inheritance. Mendel investigated characters and garden pea plant that were manyfested as two opposing traits, e.g. tall and dwarf plants, yellow and green seeds ,etc. He conducted is cross pollination experiments using several true breeding pea lines, i.e. the ones that have undergone continuous self pollination and shows table traits inheritance and expression for several generations.
i. The characteristic of true breeding is
a) self pollination
b) stable trait inheritance
c) expression for several generations
d) All of the above
ii. Which of the following are genetically identical?
a) brothers and sisters in the same
b) cutting taken from the same
c) gametes from the same parent
d) seeds produced by the same tree.
iii. Two heterozygotes are crossed. Some of the offspring show the recessive characteristics.
What is the probability that the offspring that show the recessive characteristic are homozygous?
a) 0.00
b) 0.5
c) 0.25
d) 1.00
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iv. In the spotted leopard, coat colour is controlled by a single gene with two alleles,
H and h. The black panther is a variety of spotted leopard.the diagram shows a cross between a spotted leopard and a black panther. All the offspring in the F1 generation were spotted leopards.the results of a cross between two animals of the F1 generation are also shown.
What are the genotypes of the original two parents ?
Spotted leopard. Black panther
a). HH. hh
b). HH. Hh
c). HH. hh
d). Hh. Hh
v. the diagram shows the inheritance of flower colour and pure breathing roses. Which flower is heterozygous for colours ?
20. The human respiratory system is composed of a pair of lungs. These are attached to a system of tubes which open on the outside nostrils. Choose the correct option with respect to the function.
i. The correct passage of air is:-
a) Pharynx -->Larynx--> Trachea
b) Nasal passage --> Trachea --> Bronchi
c) Bronchioles --> Lungs --> Bronchi
d) Larynx --> Pharynx--> Trachea
ii. What causes emphysema?
a) Blockage of the bronchioles.
b) Inflammation of the walls of the alveolar .
c) Overproduction of mucus debt .
d) Destruction of the alveolar walls.
iii. What causes an oxygen dept to develop?
a) Breathing become very rapid.
b) Oxygen demand exceed oxygen supply.
c) Carbon dioxide level in the blood rises .
d) The heartbeat increases.
iv. The diagram shows a respirometer used to measure oxygen uptake by woodice.
What is X?
a) Buffer solution to control the pH.
b) lime water to indicate the presence of carbon dioxide.
c) potassium hydroxide solution to absorb carbon dioxide.
d) water to control the humidity.
v. The growth curve shows the change in the size of a yeast population maintained under an aerobic conditions .
In which stage of growth is there the greatest mean rate of ethanol production per cell?
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By Anuranjan Gadekar
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