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School Olympiads - National Science Olympiad (NSO) previous year questions (PYQ)

182 previous year School Olympiads - National Science Olympiad (NSO) questions, grouped by year, with answers and solutions.

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2025 (5 questions)

Q1.
A car of mass $1000\text{ kg}$ is moving at $20\text{ m/s}$. The brakes are applied and it comes to rest in $5\text{ seconds}$. What is the magnitude of the average braking force exerted on the car?

(A)
{'key': 'A', 'text': '2000 N'}
(B)
{'key': 'B', 'text': '4000 N'}
(C)
{'key': 'C', 'text': '5000 N'}
(D)
{'key': 'D', 'text': '10000 N'}
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Q2.
A wooden block of mass $4\text{ kg}$ rests on a table. The contact area of its base is $0.02\text{ m}^2$. Taking $g = 10\text{ m/s}^2$, what is the pressure exerted by the block on the table?

(A)
{'key': 'A', 'text': '200 Pa'}
(B)
{'key': 'B', 'text': '800 Pa'}
(C)
{'key': 'C', 'text': '2000 Pa'}
(D)
{'key': 'D', 'text': '4000 Pa'}
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2024 (88 questions)

Q1.

Chemistry (Indicators): When a few drops of Phenolphthalein are added to an aqueous solution of sodium hydroxide ($NaOH$) in 'NSO Physics: Mechanics, Optics, Electricity, Magnetism and Gravitation Challenges', what color change is observed?

(A)

Turns intense pink / magenta (NSO Physics: Mechanics, Optics, Electricity, Magnetism and Gravitation Challenges)

(B)

Remains completely colorless

(C)

Turns yellow

(D)

Turns brick red

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Q2.

Physics (Buoyancy & Archimedes): A solid metallic cube of edge 10 cm and density $2700\text{ kg/m}^3$ is completely submerged in water (density $1000\text{ kg/m}^3$) in 'NSO Physics: Mechanics, Optics, Electricity, Magnetism and Gravitation Challenges'. What is the buoyant force acting on it? ($g = 9.8\text{ m/s}^2$)

(A)

$9.8\text{ N}$ ($F_b = \rho_w V g = 1000 \times 10^{-3} \times 9.8 = 9.8\text{ N}$) (NSO Physics: Mechanics, Optics, Electricity, Magnetism and Gravitation Challenges)

(B)

$26.46\text{{ N}}$

(C)

$19.6\text{{ N}}$

(D)

$98\text{{ N}}$

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2023 (16 questions)

Q1.
[Achievers Section - HOTS]
A body of mass $26\text{ kg}$ moves under a constant force of $140\text{ N}$ in a laboratory experiment on Magnetism, Poles & Magnetic Induction. What is the acceleration produced in $\text{m/s}^2$?

(A)
{'key': 'A', 'text': '5 m/s²'}
(B)
{'key': 'B', 'text': '10 m/s²'}
(C)
{'key': 'C', 'text': '8 m/s²'}
(D)
{'key': 'D', 'text': '3 m/s²'}
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Q2.
A body of mass $12\text{ kg}$ moves under a constant force of $70\text{ N}$ in a laboratory experiment on Analytical Physical & Biological Sciences. What is the acceleration produced in $\text{m/s}^2$?

(A)
{'key': 'A', 'text': '5 m/s²'}
(B)
{'key': 'B', 'text': '10 m/s²'}
(C)
{'key': 'C', 'text': '8 m/s²'}
(D)
{'key': 'D', 'text': '3 m/s²'}
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2022 (16 questions)

Q1.
[Achievers Section - 3 Marks]
An object is placed at a distance of $15\text{ cm}$ in front of a concave mirror of focal length $10\text{ cm}$. Which of the following statements correctly describes the nature, magnification and position of the image formed?

(A)
{'key': 'A', 'text': 'Virtual, erect, magnified at 30 cm behind mirror'}
(B)
{'key': 'B', 'text': 'Real, inverted, magnified with $m = -2$ at 30 cm in front of mirror'}
(C)
{'key': 'C', 'text': 'Real, inverted, diminished with $m = -0.5$ at 15 cm'}
(D)
{'key': 'D', 'text': 'Real, erect, magnified with $m = +2$ at 30 cm'}
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Q2.
[Achievers Section - HOTS]
A body of mass $10\text{ kg}$ moves under a constant force of $60\text{ N}$ in a laboratory experiment on Electricity, Simple Circuits & Conductors. What is the acceleration produced in $\text{m/s}^2$?

(A)
{'key': 'A', 'text': '6 m/s²'}
(B)
{'key': 'B', 'text': '12 m/s²'}
(C)
{'key': 'C', 'text': '9 m/s²'}
(D)
{'key': 'D', 'text': '4 m/s²'}
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2021 (16 questions)

Q1.
A body of mass $8\text{ kg}$ moves under a constant force of $50\text{ N}$ in a laboratory experiment on Physical vs Chemical Changes & Rusting. What is the acceleration produced in $\text{m/s}^2$?

(A)
{'key': 'A', 'text': '6 m/s²'}
(B)
{'key': 'B', 'text': '12 m/s²'}
(C)
{'key': 'C', 'text': '9 m/s²'}
(D)
{'key': 'D', 'text': '4 m/s²'}
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Q2.
A car of mass $1000\text{ kg}$ is moving at $20\text{ m/s}$. The brakes are applied and it comes to rest in $5\text{ seconds}$. What is the magnitude of the average braking force exerted on the car?

(A)
{'key': 'A', 'text': '2000 N'}
(B)
{'key': 'B', 'text': '4000 N'}
(C)
{'key': 'C', 'text': '5000 N'}
(D)
{'key': 'D', 'text': '10000 N'}
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2020 (12 questions)

Q1.
[Achievers Section - HOTS]
A body of mass $34\text{ kg}$ moves under a constant force of $180\text{ N}$ in a laboratory experiment on Chemical Reactions, Stoichiometry & Carbon Compounds. What is the acceleration produced in $\text{m/s}^2$?

(A)
{'key': 'A', 'text': '5 m/s²'}
(B)
{'key': 'B', 'text': '10 m/s²'}
(C)
{'key': 'C', 'text': '8 m/s²'}
(D)
{'key': 'D', 'text': '3 m/s²'}
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Q2.
A body of mass $20\text{ kg}$ moves under a constant force of $110\text{ N}$ in a laboratory experiment on Acids, Bases, Salts & Chemical Indicators. What is the acceleration produced in $\text{m/s}^2$?

(A)
{'key': 'A', 'text': '5 m/s²'}
(B)
{'key': 'B', 'text': '10 m/s²'}
(C)
{'key': 'C', 'text': '8 m/s²'}
(D)
{'key': 'D', 'text': '3 m/s²'}
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2019 (14 questions)

Q1.
[Achievers Section - HOTS]
A body of mass $18\text{ kg}$ moves under a constant force of $100\text{ N}$ in a laboratory experiment on Atomic Structure, Chemical Bonding & Periodic Table. What is the acceleration produced in $\text{m/s}^2$?

(A)
{'key': 'A', 'text': '5 m/s²'}
(B)
{'key': 'B', 'text': '10 m/s²'}
(C)
{'key': 'C', 'text': '8 m/s²'}
(D)
{'key': 'D', 'text': '3 m/s²'}
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Q2.
A body of mass $46\text{ kg}$ moves under a constant force of $240\text{ N}$ in a laboratory experiment on Motion, Speed, Distance-Time Graphs & Waves. What is the acceleration produced in $\text{m/s}^2$?

(A)
{'key': 'A', 'text': '5 m/s²'}
(B)
{'key': 'B', 'text': '10 m/s²'}
(C)
{'key': 'C', 'text': '8 m/s²'}
(D)
{'key': 'D', 'text': '3 m/s²'}
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2018 (15 questions)

Q1.
A body of mass $30\text{ kg}$ moves under a constant force of $160\text{ N}$ in a laboratory experiment on Analytical Physical & Biological Sciences. What is the acceleration produced in $\text{m/s}^2$?

(A)
{'key': 'A', 'text': '5 m/s²'}
(B)
{'key': 'B', 'text': '10 m/s²'}
(C)
{'key': 'C', 'text': '8 m/s²'}
(D)
{'key': 'D', 'text': '3 m/s²'}
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Q2.
A body of mass $44\text{ kg}$ moves under a constant force of $230\text{ N}$ in a laboratory experiment on Food, Nutrients & Digestive System. What is the acceleration produced in $\text{m/s}^2$?

(A)
{'key': 'A', 'text': '5 m/s²'}
(B)
{'key': 'B', 'text': '10 m/s²'}
(C)
{'key': 'C', 'text': '8 m/s²'}
(D)
{'key': 'D', 'text': '3 m/s²'}
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