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. Which type of chemical reaction is shown in the given image?

a) Redox reaction. b) Combination reaction

b) Decomposition reaction. d) Displacement reaction
2. A white precipitate formed by the reaction of barium chloride with sodium sulphate solution is
due to
a) BaSO3
b) BaSO4
c) BaO
d) BaS
3. Which of the following is not a mineral acid?
a) Nitric acid b) Sulphuric acid
b) Hydrochloric acid d) Citric acid
4. Substance X is formed by the reaction of carboxylic acid and alcohol. It is used in making ice
creams, cold drinks, perfumes and in flavouring agent. Name X.
a) Aldehyde b) Alkyne
b) Ester d) Ketone
5. Take three boiling tubes A, B and C. Pour some water in test tube A Put iron nails in it and cork it.
Pour boiled distilled water in another test tube B and put iron nails in it. Add 1 ml of oil over it
such that oil floats over it and prevents the air from entering. Take some iron nails in test tube C
and put some anhydrous calcium chloride in it and cork it. Leave all the three test tubes for one
day and then observe.
 In which test tube nail is rusted?
a) Tube B and C b) Tube B
b) Tube A d) Tube A and C
6. The ratio of HCl and HNO3 In Aqua Regia is:
a) 3 : 2 b) 3 : 1
b) 1 : 3 d) 2 : 3
7. The correct electron dot structure of a water molecule is
8. A student covered a leaf from a de-starched plant with a black paper strip and kept it in the
garden outside his house in fresh air. In the evening, he tested the covered portion of the leaf for
the presence of starch. By doing so the student was trying to show that:
a) Chlorophyll is necessary for photosynthesis. (b) Carbon dioxide is necessary for
photosynthesis. (c) Carbon dioxide is given out during respiration. (d) Light is necessary
for photosynthesis.
9. Two pink colored flowers on crossing resulted in 1 red, 2 pink, and 1 white flower progeny. The
nature of the cross will be
a) Self pollination b) double fertilization
b) No fertilization d) cross fertilization
10. The given graph shows the hormonal changes during a normal menstrual cycle. What would be a
likely consequence if the hormone represented by Q in the given graph is lacking in an adult
female?

a) Levels of the hormone represented by graph P would be higher than normal.

b) Fertilization of ovum would fail to occur.
c) There would be no significant effect since the functions of the hormones overlap.
d) The uterine lining might not be sufficiently stable for implantation of fertilized ovum.
 11. Name the chromosomes that possess the gene for maleness and femaleness in humans.
a) Sex chromosomes b) None of these
b) Somatic chromosomes d) Autosomes
12. Choose the correct path of urine in our body
a) Kidney Ureter Urethra Urinary Bladder
b) Urinary bladder Kidney Ureter Urethra
c) Kidney Urinary bladder Urethra Ureter
d) Kidney Ureters Urinary bladder Urethra
13. Which of the following property of a proton can change while it moves freely in a magnetic field?
a) Momentum b) speed
b) Acceleration d) mass
14. Which of the following instruments does not have plus (+) or minus (-) sign marked on it while
representing in a circuit diagram?
a) Galvanometer b) Ammeter
b) Cell d) Rheostat
15. The decomposers in an ecosystem:
a) Do not breakdown organic compounds b) Convert inorganic material to simpler forms
(c) Convert organic material to inorganic forms d) Convert inorganic materials into
organic compounds
16. An agriculture / crop land is:
a) A community of plants and animals only b) A natural ecosystem
b) An artificial ecosystem d) A biomes
17. Assertion (A): A lead nitrate on thermal decomposition gives lead oxide, brown coloured
nitrogen dioxide and oxygen gas.
Reason (R): Lead nitrate reacts with potassium iodide to form yellow ppt. of lead iodide and the
reaction is double displacement as well as precipitation reaction.
a) Both A and R are true and R is the correct explanation of A.
b) Both A and R are true but R is not thecorrect explanation of A.
c) A is true but R is false.
d) A is false but R is true.
18. Assertion (A): Copper -T can be used as a contraceptive method.
Reason (R): It prevents from sexually transmitted disease.
19. Assertion (A): On freely suspending a current-carrying solenoid, it comes to rest in NS direction
just like a bar magnet.
Reason (R): One end of current-carrying straight solenoid behave as a north pole and the other
end as a south Pole.
20. Assertion (A): Herbivores are called first-order consumers.
Reason (R): Tiger is a top carnivore.

Section B

21. Write the balanced chemical equation for the following:

 a. Methane is burned insufficient air.
b. Ethanol is treated with sodium.
c. Ethanoic acid is reacted with sodium hydroxide.
d. Ethanoic acid is treated with sodium carbonate.
e. Ethanol is mixed with ethanoic acid in the presence of an acid. [2]

22. What is puberty? Mention any two changes that are common to both boys and girls in early teenage
years. [2]

23. Plants excrete waste products from their body by various means. Justify the above statement. [2]

OR

Why is it not advisable to sleep under a tree at night while resting under it during mid-day is not bad?

24. A concave lens has focal length of 15 cm. At what distance should the object from the lens be placed
so that it forms an image at 10 cm from the lens? Also, find the magnification produced by the lens.
[2]

25. Carnivores cannot be self-dependent and have to depend on herbivores. Explain. [2]

OR

Calculate the percentage of energy that will be available to big fish in the following foods chain: Small
algae, zooplankton, fish, big fish. The energy available to small algae from sun is 10000 J.

26. Name four colours of the spectrum of white light which have wavelengths longer than blue light. [2]

27. Nikita took Zn, Al, Cu, Fe, Mg and Na metal and put each metal in cold water and then hot water. She
reacted the metal with steam

(i) Name the metal which reacts with cold water.

(ii) Which of the above metals react with steam?
(iii) Name the metal which reacts with hot water.
(iv) Arrange these metals in order of increasing reactivity. [3]

28. In what forms are metals found in nature? With the help of examples, explain how metals react with
oxygen, water and dilute acids. Also, write chemical equations for the reactions. [3]

OR

Give reasons for the following:

i. Generally no hydrogen gas is evolved when metals react with dilute nitric acid.
ii. Sodium hydroxide solution cannot be kept in aluminium containers.
iii. Silver metal does not combine easily with oxygen but silver jewellery tarnishes after some
time.
iv. Sodium is obtained by the electrolysis of its molten chloride and not from its aqueous
solution.
v. Aluminium reacts with dilute hydrochloric acid slowly in the beginning.
29. Describe the process of urine formation in kidneys.

30. i. Who provided the evidence of DNA as genetic material?

ii. Why DNA is called polynucleotide?

iii. List three important features of double helical model of DNA.

[3]

31. Differentiate between virtual image formed by a concave mirror and of a convex mirror. [3]

32. i. Write the relationship between electrical resistance and electrical resistivity for a metallic
conductor of cylindrical shape. Hence derive the SI unit of electrical resistivity.

ii. Find the resistivity of the material of a metallic conductor of length 2 m and area of cross-section 1.4
10-6 m2. The resistance of the conductor is 0.04 ohm.[3]

33. Study the following circuit and answer the questions that follows:

i. How much current is flowing through

a. 10 ohm resistor and
b. 15 ohm resistor?
ii. What is the ammeter reading?

Section D

34. Draw the structures for the following compounds.

i. Ethanoic acid
ii. Bromopentane*
iii. Butanone
iv. Hexanal.

*Are structural isomers possible for bromopentane? [5]

OR

i. How is vinegar made?

 ii. What is glacial acetic acid? What is its melting point?
iii. Why is butanoic acid a weak acid?
iv. Write the name and the formula of the two compounds formed when the ester,
CH3COOC2H5 undergoes saponification.

35. i. In the female reproductive system of human beings, state the funtions of

a. Ovary
b. Oviduct
iii. Mention the changes which the uterus undergoes, when
a. It has to receive a zygote.
b. No fertilization takes place.
iv. State the function of placenta. [5]

OR

Draw the structure of a neuron and describe its function.

36. A thin converging lens form a real magnified image and virtual magnified image of an object in front
of it. [5]

i. Write the positions of the objects in each case.

ii. Draw ray diagrams to show the image formation in each case.

iii. How will the following be affected on cutting this lens into two halves along the principal axis?

a. Focal length
b. Intensity of the image formed by half lens.

OR

Rishi went to a palmist to show his palm. The palmist used a special lens for this purpose.

i. State the nature of the lens and the reason for its use.
ii. Where should the palmist place/hold the lens so as to have a real and magnified image of an
object?
iii. If the focal length of this lens is 10 cm and the lens is held at a distance of 5 cm from the
palm, use lens formula to find the position and size of the image.

Section E

37. Read the text carefully and answer the questions:

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 that is 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.
 (i) If given acids are phosphoric acid, carbonic acid, hydrochloric acid and sulphuric
acid, then which acid does not form an acidic salt?
(ii) What is the formula of baking soda?

OR

Name the substance which on treatment with chlorine to obtain bleaching powder.

38. Read the text carefully and answer the questions:

Adrenaline is secreted directly into the blood and carried to different parts of the body. The target organs
or the specific tissues on which it acts include the heart. As a result, the heart beats faster, resulting in
the supply of more oxygen to our muscles. The blood to the digestive system and skin is reduced due to
contraction of muscles around small arteries in these organs. This diverts the blood to our skeletal
muscles. The breathing rate also increases because of the contractions of the diaphragm and the rib
muscles. All these responses together enable the animal body to be ready to deal with the situation.
Such animal hormones are part of the endocrine system which constitutes the second way of control and
coordination in our body. [4]

(iii) How does chemical coordination take place in animals ?

(iv) Which hormone is called an emergency hormone?
(v) Where are the adrenal gland present in our body?

OR

How does our body respond when adrenaline is secreted into the blood ?

39. Read the text carefully and answer the questions:

An insulated copper wire wound on a cylindrical cardboard tube such that its length is greater than its
diameter is called a solenoid. When an electric current is passed through the solenoid, it produces a
magnetic field around it. The magnetic field produced by a current-carrying solenoid is similar to the
magnetic field produced by a bar magnet. The field lines inside the solenoid are in the form of parallel
straight lines. The strong magnetic field produced inside a current-carrying solenoid can be used to
magnetize a piece of a magnetic material like soft iron when placed inside the solenoid. The strength of
the magnetic field produced by a current-carrying solenoid is directly proportional to the number of
turns and strength of the current in the solenoid. [4]

(i) What would be the strength of the magnetic field inside a long current-carrying straight
solenoid?
(ii) Which end is north and which end is south pole when current flows through a solenoid?
(iii) A long solenoid carrying a current produces a magnetic field B along its axis. If the current is
double and the number of turns per cm is halved, then what will be the new value of the
magnetic field?
OR
A soft iron bar is enclosed by a coil of insulated copper wire as shown in the figure. When
the plug of the Key is closed, then where would the face B of the iron bar be marked?