First 33% TEST (2022-2023)-X STANDARD

Subject:Science(Phy-26,CHE-27,Bio-27) Date: 07.11.2022

Time:3.00 hr Marks:80
General Instructions:
i. This question paper consists of 39 questions in 5 sections.
ii. All questions are compulsory. However, an internal choice is provided in some questions. A
student is expected to attempt only one of these questions.
iii. Section A consists of 20 objective type questions carrying 1 mark each.
iv. Section B consists of 6 Very Short questions carrying 02 marks each. Answers to these questions
should in the range of 30 to 50 words.
v. Section C consists of 7 Short Answer type questions carrying 03 marks each. Answers to these
questions should in the range of 50 to 80 words
vi. Section D consists of 3 Long Answer type questions carrying 05 marks each. Answer to these
questions should be in the range of 80 to 120 words.
vii. Section E consists of 3 source-based/case-based units of assessment of 04 marks each with sub-
parts.
Section-A (20X1=20)
Select and write one most appropriate option out of the four options given for each of the
questions 1 – 20.
1. In which mode of nutrition an organism de-rives its food from the body of another living organism
without killing it?
(a) Saprotrophic nutrition (b) Parasitic nutrition
(c) Holozoic nutrition (d) Autotrophic nutrition.
2. Which of the following events in the mouth cavity will be affected if salivary amylase is lacking
in the saliva?
(a) Starch breaking down into sugars.
(b) Proteins breaking down into amino acids.
(c) Absorption of vitamins.
(d) Fats breaking down into fatty acids and glycerol
4. When a few drops of iodine solution are added to rice water, the solution turns blue- black in
colour. This indicates that rice water contains:
(a) fats (b) complex proteins
(c) starch (d) simple proteins
5. Which is the correct sequence of body parts in the human alimentary canal?
(a) Mouth → stomach → small intestine → large intestine → oesophagus
(b) Mouth → oesophagus → stomach → small intestine → large intestine
(c) Mouth → stomach → oesophagus → small lintestine → large intestine
(d) Mouth → oesophagus → stomach → large intestine → small intestine.
6. Observe the experimental setup shown below. Name the chemical indicated as ‘X’ that can absorb
the gas which is evolved as a byproduct of respiration.

(a) NaOH (b) KOH (c) Ca (OH)2 (d) K2CO3

7. Focal length of a plane mirror is
(a) 0 (b) infinite (c) 25cm (d) -25cm
8. A beam of light incident on a plane mirror forms a real image on reflection. The incident beam is :
(a) parallel (b) convergent (c) divergent (d) not certain
9. Image formed by a convex spherical mirror is:
(a) virtual (b) real (c) enlarged (d) inverted
10. Which of the following phenomena contributes significantly to the reddish appearance of the sun
at sunrise or sunset?
(a) Dispersion of light (b) Scattering of light
(c) Total internal reflection of light (d) Reflection of light from the earth
11. The bluish colour of water in deep sea is due to
(a) the presence of algae and other plants found in water (b) reflection of sky in water
(c) scattering of light (d) absorption of light by the sea
12. When light rays enter the eye, most of the refraction occurs at the
(a) crystalline lens (b) outer surface of the cornea
(c) iris (d) pupil
13.Fe2O3 + 2Al → Al2O3 + 2Fe
The above reaction is an example of a
(a) combination reaction. (b) Double displacement reaction
(b) (c)Decomposition reaction (d) Displacement reaction.
14. Which of the following gases is used to store fat and oil-containing foods for a long time?
(a)Carbon dioxide (b) Oxygen (c) Nitrogen (d) Neon
15.A solution reacts with crushed egg- shells to gives a gas that turns lime-water milky.
(a) NaCl (b) HCl (c) LiCl (d) KCl
16. Which one of the following types of medicines is used for treating indigestion?
(a) Antibiotic (b) Analgesic (c) Antacid (d) Antiseptic
Q. no 17 to 20 are Assertion - Reasoning based questions. These consist of two statements –
Assertion (A) and Reason (R). Answer these questions selecting the appropriate option given
below:
(a) Both A and R are true and R is the correct explanation of A
(b) Both A and R are true and R is not the correct explanation of A
(c) A is true but R is false
(d) A is False but R is true
17. Assertion (A) : In anaerobic respiration, one of the end product is alcohol.
Reason (R) : There is an incomplete breakdown of glucose.
18. Assertion (A) : Human heart is four-chambered.
Reason (R) : Vena cava is the only artery that supplies deoxygenated blood to the heart.
19. Assertion (A) : Calcium carbonate when heated gives calcium oxide and water.
Reason (R) : On heating calcium carbonate, decomposition reaction takes place.
20. Assertion (A) : A ray passing through the centre of curvature of a concave mirror after
reflection, is reflected back along the same path.
Reason (R) : The incident rays fall on the mirror along the normal to the reflecting surface.
Section-B (6x2=12)
Q. no. 21 to 26 are very short answer questions
21. Give two reason why multicellular organisms require special organs for exchange of gases
between their body and their environment.
22. What are the end products formed during fermentation in yeast? Under what condition a similar
process takes place in our body that lead to muscle cramps?
(Or)
What is the basic unit of kidney called? Why is it composed of very thin blood capillaries?
23. Why there is no dispersion of light refracted through a rectangular glass slab?
(OR)
Is the position of a star as seen by us in its true position? Justify your answer.
24. Define power of a lens. What is its unit?
25.What is a balanced chemical equation? Why should chemical equation be balanced?
26.Define PH scale?
Section-C (7x3=21)
Q.no. 27 to 33 are short answer questions.
27. Observe the diagram of Human digestive system.

Match the labeling referred in column I and correlate with the function in column II.

A. i.- a) ; ii – b) ; iii – c) ; iv- d)

B. i.- b) ; ii – c) ; iii – d) ; iv- a)
C. i.- b) ; ii – d) ; iii – c) ; iv- a)
D. i.- d) ; ii – a) ; iii – b) ; iv- c)
(Or)
Mention the two main components of the transport system in plants. State one function of each one
of these components.
28. “All plants give out oxygen during the day and carbon dioxide during night”. Do you agree with
this statement. Give reason.
29.Write the chemical equations for the following reactions.
(a) Calcium hydroxide + Carbon dioxide → Calcium carbonate + Water
(b) Zinc + Silver nitrate → Zinc nitrate + Silver
(c) Aluminium + Copper chloride → Aluminium chloride + Copper
30.What is double displacement reaction? Give an example.
31.Why does distilled water not conduct electicity, whereas rain water does? (OR)What is a
neutralisation reaction? Give two example.
32. Draw ray diagrams showing the image formation by a convex mirror when an object is placed
(a) at infinity (b) at finite distance from the mirror.
33. How will you use two identical prisms so that a narrow beam of white light incident on one
prism emerges out of the second prism as white light?

Section - D (3x5=15)
Q.no. 34 to 36 are Long answer questions
34. Draw a ray diagram showing the dispersion through a prism when a narrow beam of white light
is incident on one of its refracting surfaces. Also, indicate the order of the colours of the spectrum
obtained.
(Or)
An object , 4.0 cm in size , is placed at 25.0 cm in front of a concave mirror of focal length 15.0 cm.
At what distance from the mirror should a screen be placedin order obtain a sharp image? Find the
nature and size of the image?
35. i. Write three events which occur during the process of photosynthesis. (3)
ii. Name the energy currency in the living organisms. When and where is it produced? (2)
(Or)
Mention the pathway of urine starting from the organ of its formation. Name four substances which
are reabsorbed from the initial filtrate in the tubular part of the nephron. (5)
36. (i) Draw a labelled diagram to show the preparation of hydrogen chloride gas in laboratory. (5)
(ii) Test the gas evolved first with dry and then with wet litmus paper. In which of the two cases,
does the litmus paper show change in colour?
(iii) State the reason of exhibiting acidic character by dry HCl gas/HCl solution.
(or)

(i) What is combination reaction? Give an example.

(2)
(ii) Differntiate oxidation and reduction.
(3)
Section - E (3x4=12)
Q.no. 37 to 39 are case - based/data -based questions with 2 to 3 short sub - parts. Internal
choice is provided in one of these sub-parts.

37. The lenses forms different types of images when object placed at different locations. When a ray
is incident parallel to the principal axis, then after refraction, it passes through the focus or appears
to come from the focus.
When a ray goes through the optical centre of the lens, it passes without any deviation. If the object
is placed between focus and optical center of the convex lens, erect and magnified image is
formed.As the object is brought closer to the convex lens from infinity to focus, the image moves
away from the convex lens from focus to infinity. Also the size of image goes on increasing and the
image is always real and inverted.A concave lens always gives a virtual, erect and diminished image
irrespective to the position of the object.
(i) The location of image formed by a convex lens when the object is placed at infinity is (1)
(ii) When the object is placed at the focus of concave lens, the image formed is (1)
(iii) The size of image formed by a convex lens when the object is placed at the focus of convex
lens is (2)
(Or)
When the object is placed at 2F in front of convex lens, the location of image is (2)

38. A compound, X of sodium forms a white powder. It is a constituent of baking powder and is
used in some antacids. When heated it gives a compound, Y which is anhydrous and absorbs water
to become a hydrated salt. When this salt is kept in open air, it loses water molecules in a process
called efflorescence. When dissolved in water it forms a strong base and a weak acid, Z.
(i) What is the compound, X?
(ii) The compound, Y is______
(iii) What is the nature of the solution formed by dissolving Y in water?
(iv) Sodium carbonate is a basic compound because it is a salt of a_____
(Or)
What is hydrated salt?

39. Read the following and name the parts given below:
The human circulatory system possesses a body-wide network of blood vessels. These
comprise arteries, veins, and capillaries. The primary function of blood vessels is to transport
oxygenated blood and nutrients to all parts of the body. It is also tasked with collecting metabolic
wastes to be expelled from the body.
(a) Part which receives deoxygenated blood from vena cava
(b) Part which sends deoxygenated blood to lung through pulmonary artery
(c) Part which receives oxygenated blood from lungs
(d)Part which sends oxygenated blood to all parts of the body through aorta
(Or)
(d)Blood vessel that carries blood from heart to the lungs.