Updated for 2026–27: This page contains an archived SCO Olympiad Class 11 Science previous-year practice paper with an embedded PDF, 10 practice questions and an answer key. The existing URL is being preserved because it already has Google search history, while the visible page now correctly identifies the resource as SCO Olympiad.

Use this paper as a diagnostic exercise across Physics, Chemistry and Biology. Attempt the questions first, mark every guessed answer, and then revise the concept behind each mistake. For Class 11, this is especially useful because the questions move quickly between numerical reasoning, diagrams, biological processes and chemistry concepts.

Current curriculum note: NCERT currently publishes separate Class XI textbooks for Physics, Chemistry and Biology, rather than one combined Science textbook. This archived Olympiad paper mixes concepts from those areas, so it remains useful for cross-subject practice while students follow their current school books for the latest chapter sequence and assessment requirements. See the NCERT textbook portal.

SCO Olympiad Class 11 Science Previous Year Paper PDF – Free Download

The embedded PDF is an SCO Olympiad Class 11 Science practice resource. Students who want to continue with current preparation can explore SCO International Science Olympiad resources after reviewing their mistakes.

How to Use This Class 11 Science Olympiad Paper

• Attempt the paper once without checking the answer key.
• Use a timer and mark questions that require unusually long calculations or reading.
• Separate mistakes into Physics, Chemistry and Biology so revision is easier.
• For numerical questions, write the full working instead of choosing an option by elimination alone.
• For diagram and process questions, explain the concept in your own words after checking the answer.

Important: this is an archived practice paper. Exam-day instructions, section names, response-sheet rules and scoring can change, so always follow the current SCO Olympiad paper, admit card and official guidance.

1. A graph of x versus t is shown in the figure. Choose the correct alternatives from the list below.

(i) The particle was released from rest at t = 0. 

(ii) At B, the acceleration a > 0. 

(iii) At C, the velocity and the acceleration vanish. 

(iv) Average velocity for the motion between A and D is positive.

(v) The speed at D exceeds that at E.

1. (i), (iii), (iv)
2. (i), (ii), (v)
3. (i), (ii), (iv)
4. (i), (iii), (v)

2. A fighter plane is flying horizontally at an altitude of 1.5 km with a speed 720 km/h. At what angle of sight (w.r.t. horizontal) when the target is seen, should the pilot drop the bomb in order to attack the target? 

1. 23^o4’
2. 33^o4’
3. 43^o4’
4. 22^o4’

3. Identify the parts P to U of the given figure.

1. 1. P- Centriole, Q-Chromosome, R- Spindle fibre, S- Kinetochore, T- Sister chromatids, U-Aster

2. P- Centriole, Q- Aster, R- Spindle fibre, S- Kinetochore, T- Sister chromatids, U- Chromosome

3. P- Centriole, Q-Chromosome, R- Spindle fibre, S- Sister chromatids, T- Kinetochore, U-Aster

4. P- Centriole, Q- Spindle fibre, R- Chromosome, S- Kinetochore, T- Sister chromatids, U-Aster

4.  A process is occurring throughout the day, in ‘X’ organisms. Cells are participating in this process. During this process, ATP, CO₂ and water are evolved. It is not a light dependent process. 

Which of the following statements is correct about the given process?

1. The process is called cellular respiration.
2. It is a catabolic process because it involves the glucose molecule breakdown. 
3. The raw materials involved in the cellular respiration process are glucose molecules and oxygen.
4. All of these

5. A plant shows Thallus’ level of organization. It shows rhizoids and is haploid. It needs water to complete its life cycle because the male gametes are motile. Identify the group to which it belongs to:

1. Pteridophytes
2. Gymnosperms 
3. Monocots 
4. Bryophytes

6. The correct sequence of flow of electrons in the light reaction is _________.

1. PSII, plastoquinone, cytochromes, PSI, ferredoxin 
2. PSI, plastoquinone, cytochromes, PSII, ferredoxin 
3. PSI, ferredoxin, PSII 
4. PSI, plastoquinone, cytochromes, PSII, ferredoxin

7. Match the following list of animals with their level of organisation. 

Division of Labour                             Animal 

Column I                                           Column II 

A. Organ level                                 i. Pheretima 

B. Cellular aggregate level            ii. Fasciola 

C. Tissue level                                 iii. Spongilla 

D. Organ system level                   iv. Obelia 

Choose the correct match showing division of labour with animal examples. 

(a) i-B, ii-C, iii-D, and iv-A 

(b) i-B, ii-D, iii-C, and iv-A 

(c) i-D, ii-A, iii-B, and iv-C 

(d) i-A, ii-D, iii-C, and iv-B

 8. The pollutants that come directly into the air from sources are called primary pollutants. Primary pollutants are sometimes converted into secondary pollutants. Which of the following belong to secondary air pollutants?

1. CO 
2. Hydrocarbon 
3. Peroxyacetyl nitrate 
4. NO

9. For an electrophilic substitution reaction, the presence of a halogen atom in the benzene ring _______.

1. deactivates the ring by inductive effect. 
2. deactivates the ring by resonance 
3. increases the charge density at ortho and para positions relative to meta positions by resonance 
4. directs the incoming electrophile to metaposition by increasing the charge density relative to ortho and paraposition. 

1. 1 and 3
2. 2 and 4
3. 1, 2 and 3
4. None of these

  10. Name a plant, that accumulates silicon.

1. Oryza sativa 
2. Triticum aestivum 
3. Both (a) and (b)
4. None of these

Answer Key

Ques. 1	(d)	Ques. 6	(a)
Ques. 2	(a)	Ques. 7	(c)
Ques. 3	(a)	Ques. 8	(c)
Ques. 4	(d)	Ques. 9	(a)
Ques. 5	(d)	Ques. 10	(c)

Quick Explanations for Selected Answers

• Q2: At 720 km/h the plane travels at 200 m/s. From a height of 1.5 km, the fall time is about 17.5 s, giving a horizontal distance of about 3.5 km. This gives an angle of depression close to 23°, matching option (a).
• Q4: The description is of cellular respiration: glucose is broken down, energy is released as ATP, and carbon dioxide and water are produced in aerobic respiration.
• Q5: Bryophytes have a dominant haploid gametophyte, commonly possess rhizoids and require water for the movement of male gametes during fertilisation.
• Q6: In non-cyclic electron flow the sequence is PSII → plastoquinone → cytochrome complex → PSI → ferredoxin.
• Q7: Pheretima shows organ-system level organisation, Fasciola organ level, Spongilla cellular aggregate level and Obelia tissue level, so option (c) is correct.
• Q8: Peroxyacetyl nitrate (PAN) is a secondary pollutant formed in the atmosphere through photochemical reactions.
• Q9: Halogens deactivate the benzene ring mainly through the −I effect but donate electron density by resonance at the ortho and para positions, making statements 1 and 3 correct.

Class 11 Science Olympiad FAQs

Is this PDF from SCO Olympiad?

Yes. The downloadable PDF and the practice questions on this page are SCO Olympiad Class 11 Science material retained as a previous-year practice resource.

Can I download the Class 11 Science Olympiad paper for free?

Yes. The embedded PDF can be opened or downloaded free for timed practice, revision and cross-subject concept review.

Does this archived paper exactly match the current Class 11 syllabus?

Not necessarily. Class XI science is studied through separate Physics, Chemistry and Biology courses, and chapter sequencing can change. Use this paper for Olympiad-style application while following the student’s current school textbooks.

Where can I continue with SCO Class 11 Science Olympiad preparation?

Continue with SCO International Science Olympiad resources and use the mistakes from this paper to decide which Physics, Chemistry or Biology topics need more practice.

Related Science Olympiad Practice Resources

• Class 10 Science Olympiad previous-year paper
• Class 12 Science Olympiad previous-year paper
• Class-wise Olympiad previous papers