General Instructions: -

1. This question paper consists of 39 questions in 5 sections.

2. All questions are compulsory. However, an internal choice is provided in some questions. A student is
expected to attempt only one of these questions.
3. Section A consists of 20 objective-type questions carrying 1 mark each.
4. Section B consists of 6 Very Short questions carrying 02 marks each. Answers to these questions should
be in the range of 30 to 50 words.
5. Section C consists of 7 Short Answer type questions carrying 03 marks each. Answers to these questions
should be in the range of 50 to 80 words.
6. Section D consists of 3 Long Answer type questions carrying 05 marks each. Answers to these questions
should be in the range of 80 to 120 words.
7. Section E consists of 3 source-based/case-based units of assessment of 04 marks each with sub-parts.
Section A
1. IF 20C of charge pass A point in a circuit in one second. What current is flowing?
a. None of these b. 30A
c. 20A d. 20C
2. The egg of an animal contained 10 chromosomes, of which one is X-chromosome. How many autosomes
would be there in the karyotype of this animal?
a. 9 b. 18
c. 8 d. 20
3. The teacher instructed the student to place a healthy potted shoe flower plant. In the darkroom for 24
hours prior to an experiment on photosynthesis. The purpose of placing it in the darkroom is.
a. To increase the intake of carbon dioxide. b. Do denature the enzymes in the leaves.
c. To activate the chloroplast in the leaves. d. To destarch the leaves.
4. Statement A. The magnetic field produces a current in a straight wire that has no poles.
Statement B. Like poles of the magnet repel each other.
Which of the following statements is true?
a. Statement B is true, and A is false. b. Statement A is true, B is false.
c. Statement A & B is true. d. Both statement A and B are false.
5. Although metals form basic oxides. Which of the following metals form amphoteric oxide?
a. Al b. Cu
c. Na d. Ca
6. Which of the following compounds contain the functional group-OH.
A. Propane B. Propanol C. Ethanoic acid D. Ethanol
a. All of these b. B and D
c. A and C d. B and C
7. Two solutions A & B were found to have pH values of six and eight, respectively. The interference which
can be drawn is
a. The length of solution B is higher than that of A. b. both are ACID solutions.
c. Both are basic solutions. d. A is an acid while B is a base.
8. Offspring formed as a result of sexual reproduction exhibit more variation because.
a. Genetic comes from 2 parents of different species.
b. Genetic material comes from many parents.
c. sexual reproduction Is a lengthy process.
d. Genetic material comes from 2 parents of the same species.
9. Sodium bicarbonate solution is added to dilute ethanoic acid. It is observed that.
a. The mixture becomes light yellow. b. The mixture becomes warm.
c. The solid settles at the bottom. d. A gas evolves.
10. State which of the following statements is correct or wrong.
Statement A. Estrogen brings changes in appearance seen in boys during puberty.
Statement B. Plasmodium divides into many daughter cells by regeneration.
a. Both are true. b. A is true and B is false.
c. B is true, and A is false. d. Both are false.
11. The chromatids are joined to each other by.
a. Centriole b. Centromere
c. Spindle d. Aster
12. What is the maximum power in kilowatts of the appliance that can be connected safely to a 13A, 230V
mains socket?
a. 2.95kW b. None of these
c. 2.99kW d. 2.97kW
13. A ray of light is an incident on a glass slab at an angle of 60°. If the angle of refraction is 32.7°. What will
be the refractive index of glass assuming sin 60°= 0.866 and sin 32.7° = 0.540?
a. 1.603 b. None of these
c. 1.327 d. 1.540
14. Match the following with the correct response.
 i. Bauxite a. Silver
ii. Hematite b. Iron
iii. Galena c. Aluminium
iv. Argentite d. Lead

a. i-c, ii-b, iii-d, iv-a. b. i-c, ii-d, iii-a, iv-b

c. i-d, ii-a, iii-c, iv-b d. i-a, ii-c, iii-b, iv-d
15.Mohit prepared temporary mount of a leaf peel and draw the following diagram. The missing part in the
diagram is.

a. Chloroplasts. b. Nucleus
c. Cell wall d. Epidermal cells
16. Statement A. Siemens also contains an enzyme that activates the sperm after ejaculation.
Statement B. The function of stigma is to produce ovules.
a. Both the statement A&B are true. b. Statement B is true. A is false.
c. Statement A is true, B is false. d. Neither statement A nor statement B is true.
DIRECTION: In the following questions, a statement of assertion (A) is followed by a statement of Reason
(R) . Mark the correct choice as:
(a) Both assertion (A) and reason (R) are true, and reason (R) is the correct explanation of assertion (A)
(b) Both assertion (A) and reason (R) are true, and reason (R) is not the correct explanation of assertion
(A)
(c) Assertion(A) is true, but reason(R) is false.
(d) Assertion(A) is false, but reason(R) is true.

17. Assertion (A). Magnetic field lines never intersect.

Reason (R). At a particular point, magnetic field lines have only One Direction.
18. Assertion (A). Ammonia solution is an alkali.
Reason (R). Ammonia solution turns blue, litmus paper red.
19. Assertion (A). Phototropism is a directional growth movement.
Reason (R). It occurs in the direction of light.
20. Assertion (A). CFC's deplete the ozone layer.
Reason (R). CFC's are used as refrigerants and in fire extinguishers.
 Section B
21. An organic compound A (Molecular formula C2H4O2). Reacts with sodium metal. To form a compound B.
And evolves a gas. Which burns with a pop sound. Compound A on treatment with alcohol C. In the
presence of a little concentrated sulphuric acid. Forms a sweet-smelling compound D (Molecular formula
C3H6O2) Compound D. On treatment with NaOH solution. Gives back B&C. Identify A, B, C&D.
OR
Mention four differences between saturated and unsaturated hydrocarbons.
22. Explain reflex arc or reflex path.
OR
What will happen if you step accidentally on a nail?
23. Why is damage to the ozone layer a cause for concern? What steps are being taken to limit this damage?
24. What is biomass? How is the energy related to it?
25. An object is placed at a distance of 10 centimeters from a convex mirror of focal length 15 centimeter.
Find the position and nature of image.
OR
4
A real image Size of the object is from 18 centimeter from a lens. Calculate the focal length of the lens.
5
26. Draw the electron dot structure for propanone.
Section C
27. Explain the following terms of gain or loss of oxygen with two examples each.
a. Oxidation
b. Reduction
28. What should be the position of an object with respect to focus of a convex lens of focal length 20
centimeter So that its real image and magnified image is obtained?
29. Answer the following by carefully studying the figure.

a. Identify the image shown above.

b. Label in the figure. The ovary, oviduct, uterus, and vagina.
c. State the functions of the labeled part.
OR
An individual may have good health even when the whole reproductive system is removed. What then is
the function of reproductive system?
30. When one enters a less lighted room from a place of intense light, he is not able to see anything for some
time. But after some time, the things become somewhat visible. Explain how this happens.
31. Magnesium ribbon is burned in oxygen to give a white compound X accompanied by emission of light. If
the burning ribbon is now placed in an atmosphere of nitrogen, it continues to burn and form a compound
Y.
a. Write the formula of X&Y.
b. Write the balanced chemical equation when X is dissolved in water.
32. Show how man has been able to produce crop plant by selective breeding.
OR
In a monohybrid cross, pink coloured flowers are dominant over white coloured flowers. If parent plants
belong to pure breeding dominant trait and pure breeding recessive trait, what will be the phenotype or
morphological feature of F1-generation? If F1 plants are self-fertilised, what would be the phenotypic ratio
or how many dominant and recessive traits will be produced in the progeny? Explain with an illustration.
33. A student sitting at the back of the classroom cannot read clearly the letters written on the blackboard.
What advice will a doctor give to her?
Section D
34. How is copper obtained from its ore (Cu2S)? Write only chemical equations. How is copper obtained is
refined? Name and explain the process along with a labeled diagram.
OR
An over on treatment with dilute hydrochloric acid gives a smell like that of rotten eggs. What type of ores
is this? How can it be concentrated? How can the metal be obtained from the concentrated ore?
35. What are the common features between all respiratory organs? Explain the mechanism of gaseous
exchange between tissue and blood.
OR
Explain how deoxygenated blood travels from the body to lungs for purification. Draw a well labeled
diagram in support of your answer.
36. What is the necessity of earthing in electric appliances?
Section E
37. Read the text carefully and answer the questions.
If two or more resistances are connected in such a way that the same potential difference gets applied to
each of them, then they are said to be connected in parallel.
The current flowing through the two resistances in parallel is, however, not the same. When we have two
or more resistances joined in parallel to one another, then the same current gets additional paths to flow
and the overall resistance decreases.
a. Three resistances 2Ω, 6Ω and 8Ω are connected in parallel then what will be its equivalent
resistance?
b. A wire of resistance 12 Ω is cut into three equal pieces then twisted their ends together then what
will be the equivalent resistance?
OR
Three resistances are connected as shown. Calculate the equivalent resistance between A&B.

38. Salt of a strong acid and strong base is neutral with a pH value of 7. NaCl common salt is formed by a
combination of hydrochloride and sodium hydroxide solution. This is the salt used in food. Some salt is
called rock salt, bed of rock salt was formed when seas of bygone ages dried up. The common salt thus
obtained is an important raw material for various materials of daily use, such as sodium hydroxide, baking
soda, washing soda, and bleaching powder.

a. If given acids are phosphoric acid, carbonic acid, hydrochloric acid, and sulphuric acid, then
which acid
does not form an acidic salt?
b. What is the formula of baking soda?
c. Name the substance which on treatment with chlorine to obtain bleaching powder.
OR
Which salt is used for removing the permanent hardness of water?

39. Read the text carefully and answer the questions:

Sex determination is the method by which distinction between males & females is established in a species.
The sex of an individual is determined by specific chromosomes. These chromosomes are called sex
chromosomes or allosomes. X and Y chromosomes are called sex chromosomes. The normal chromosomes
other than the sex chromosomes of an individual are known as autosomes.
a. In XX-XO type of sex determination who produces two different types of gametes?
b. A couple has six daughters. What is the possibility of their having a girl next time?
OR
What is the number of autosomes present in the liver cells of a human female?