Class 10 PT II Question Paper 2025-26 Science

CBSE CLASS 10
PT II Question Paper
Session 2025-26

SCIENCE

Exam CBSE Class 10
Subject Science
Session 2025-26
Document Type PT II Question Paper

Notes · Sample Papers · Previous Year Papers · Mock Tests

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Question Paper
SECOND UNIT TEST
SESSION: 2025 – 2026 ag
Class: X Maximum Marks: 40
Subject: Science Time: 1 hour 30 Minutes
General Instructions:
���� This question paper consists of 19 questions in 3 sections and 4 pages. Section A is Biology,
Section B is Chemistry and Section C is Physics.
����� All questions are compulsory. However, an internal choice is provided in some questions. A

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student is expected to attempt only one of these questions.
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Section – A (BIOLOGY)

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1. The diagram below illustrates the major organs of the male reproductive system, but one 1

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crucial part is missing from it. Select the correct option that correctly matches the missing
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part and its primary function.
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Option Missing part Primary function
(A) Epididymis Produce sperm and testosterone
(B) Prostate gland
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Storage and maturation of sperm
(C) Seminal Vesicle
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Secretes an alkaline fluid that

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neutralises the acidity of vagina.
(D) Vas Deferens Transports mature sperm
2. Match the following modes of asexual reproduction with examples: 1
Column -A Column -B
A. Spore formation 1. Planaria
B. Regeneration 2. Rhizopus
C. Budding 3. Hydra
D. Fragmentation 4. Spirogyra

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(A) A – 2, B – 1, C – 3, D – 4 (B) A – 1, B – 2, C – 3, D – 4

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(C) A – 3, B – 2, C – 1, D – 4 (D) A – 2, B – 3, C – 1, D – 4

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3. In a species, the trait for fur colour is determined by a single gene with two alleles i.e, Black 1

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(B) and White (b). A breeder crosses a black furred male with white furred female. In the F1

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generation equal progenies were produced presenting both the traits. Based on these results,

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what would be the genotypes of the male and female parents, respectively?
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(C) Male: (BB), Female: Bb
(B) Male: (Bb), Female (BB)
(D) Male: (Bb), Female: (bb)
4. Which of the following statements correctly explains the 10% law of energy transfer? 1
(A) 10% of the total energy is lost in each trophic level.
(B) Only 10% of the energy available at one trophic level is passed to the next level.
(C) 10% of the sunlight is absorbed by producers.
(D) 10% of total energy is used for respiration in each level
5. “In human beings, males always determine the sex of the child.” Justify the statement. 2
6. In the upper atmosphere Ozone performs an essential protective function for life on earth. The 3
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thinning of it is primarily caused by synthetic chemicals like CFC, which were once common

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in refrigerators and fire extinguishers.

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(a) Name the specific atmospheric layer where the beneficial ozone is found and state its

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critical function.
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(b) Write one harmful effect on humans and plants if ozone layer continues to thin.
(c) The Montreal protocol is an international treaty aiming at reducing the use of CFCs. Why it
was necessary to deal with this problem?
7. A human embryo begins its journey as a single cell and must travel, implant, and grow in a 5
protective environment.
(a) Where does the fusion of male and female gametes take place in female reproductive
system? What is the single celled structure formed after it?
(b) Describe the two key changes the lining of the uterus undergoes each month in anticipation
of fertilized egg.
(c) Explain the term implantation and state its significance for the developing embryo.
(d) What will happen if the villi produced at the site of placental connection are less in
number?
(e) Enlist the two events that will occur if the egg released during the cycle is not fertilized.
OR
A researcher observes two different protozoans dividing:
●� Protozoan P: Divides into two equal halves along a definite, fixed plane in the cell
body.�
●� Protozoan Q: Divides into two equal halves in any plane.�
(a) Identify the type of fission demonstrated by P and Q, and name a suitable example
organism for each.
(b) Justify why the type of fission observed in Q is considered a simpler and less organized
method compared to P.
(c) Differentiate between Binary Fission and Multiple Fission.
Section – B (CHEMISTRY)
8. Which one of the following properties is not generally exhibited by ionic compounds? 1
(A) Solubility in water (B) Electrical conductivity in solid state
(C) High melting and boiling points (D) Electrical conductivity in molten state
9. An iron nail is added to each of the two test tubes „P‟ and „Q‟ containing aqueous copper (II) 1
sulphate, and aqueous silver nitrate respectively. Which of the following observation is correct?
(A) In test tube „P‟ iron nail is coated with a blue coating and in test tube „Q‟ there is no
reaction.
(B) Iron nail is coated with a brown coating in test tube „P‟ and silver coating in test tube „Q‟.
(C) There is no reaction in either of the test tubes „P‟ or „Q‟.
(D) There is no reaction in test tube „P‟ but a silver coating on iron nail is seen in test tube „Q‟.
10. For Q. No. 10 choose the correct option from the following: 1
(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.
Assertion (A): Aluminium oxide (Al2O3) is amphoteric in nature.
Reason(R): Aluminium oxide (Al2O3) forms salt with both HCl and NaOH.
11. The reaction of metal „X‟ with Fe2O3 is highly exothermic and is used to join railway tracks. 2
Identify the metal „X‟. Write the chemical equation for the reaction.
12. During extraction of metals electrolytic refining is used to obtain pure metals. Answer the 3
following questions if electrolytic refining of copper is to be done
(a) Which material will be used as anode and cathode?
(b) Suggest a suitable electrolyte.
(c) During this process where do we get pure copper after passing electric current?
13. Two elements X&Y having atomic numbers 12 and 17, combine to form a compound XY2. X 5
has 2 valence electrons. Y has 7 valence electrons. Based on the given information answer the
following questions:
(a)Identify elements X and Y.
(b) State the type of bonding in XY2 .
(c) Give the electron dot structure of XY2.
(d) Give two properties of XY2 based on its bonding.
OR
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In the following diagram magnesium ribbon and some sulphur powders are taken and burnt.

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Observe the diagrams carefully and answer the following questions:

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are separately dissolved in water and resultant solutions are tested with both a
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(a) Identify the type of

red and blue a s
l equations for all the reactions involved in the above two activities. a
(b) Both the products
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(c) Write g
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litmus Write your observations.
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Section – C (PHYSICS)
14. What is the amount of current flowing through an electric press, if the amount of charge 1
passing through a conductor in 10 minutes is 300 C?
(A) 30 A (B) 0.3 A (C) 0.5 A (D) 5 A
15. A constant current flows in a horizontal wire in the plane of the paper from east to west as 1
shown in Figure.

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(A) at a point directly above the wire.a
The direction of magnetic field will be North

(B) at a point directly below the wire.
(C) at a point located in the plane of the paper, on the north side of the wire.
(D) at a point located in the plane of the paper, on the south side of the wire.
16. For Q. No. 16 choose the correct option from the following: 1
(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.
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(D) A is false, but R is true.

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Assertion (A): If a current carrying conductor is suspended between
the poles of a horseshoe magnet such that the current is flowing from
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current parallel to the direction of magnetic field.
a 17. (a) Mention two factors on which resistivity of a material depends.
(b) If the resistivity of a wire of length l is ρ, then find the resistivity of another wire of same
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material having length 2l.
(c) A nichrome and a copper wire of same length have same resistance. Which one is thicker?
Justify.
18. A helical coil whose length is greater than its diameter is connected to a battery as shown 3
below.

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(a) How does the magnetic field at point P compare with the magnetic field at point Q? Justify
your answer.
(b) State two ways by which the strength of the magnetic field inside a current carrying helical
coil can be changed?
OR
(a) State Fleming‟s left-hand rule.
(b) An electron enters a magnetic field as shown in figure below.

Identify the case in which force is maximum and minimum respectively. Give reason for your
answer.
19. Read the following passage and answer the following questions: 4
Two groups of students, A and B, were conducting an
experiment to verify Ohm's Law. Group A executed the
experiment successfully, observing a linear relationship
between the voltage drops across the resistor and the current
through it. In contrast, Group B struggled to set up their
circuit correctly. They designed the circuit as shown in
figure. Later, their physics teacher assisted them by properly
connecting the circuit.

(a) State Ohm‟s law.
(b) Examine the circuit design created by Group and identify the mistake(s) in their
construction.
(c) During their experiment, Group A recorded the voltmeter and ammeter readings shown in
the figure below. Calculate the resistance value.

OR
(c) After correcting their circuit design, Group B tested it using a 2 Ohm resistor and took
readings from the ammeter as shown in figure below.

Determine the potential drop across that resistor.
*****

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