School Olympiads - National Science Olympiad (NSO)

Analytical Physical & Biological Sciences question bank (Advanced Physics, Chemistry & Biology)

Practice 39 free School Olympiads - National Science Olympiad (NSO) Advanced Physics, Chemistry & Biology - Analytical Physical & Biological Sciences questions with answers and step-by-step solutions.

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Q1.

Achievers Section: A spherical gas bubble released from the bottom of a lake of depth 40 m rises to the surface in 'NSO Physics: Mechanics, Optics, Electricity, Magnetism and Gravitation Challenges'. Assuming constant temperature and atmospheric pressure $P_0 = 10\text{ m}$ of water, by what factor does its volume expand?

(A)

Factor of 5 ($P_1 V_1 = P_2 V_2 \implies (10 + 40) V_1 = 10 V_2 \implies V_2/V_1 = 5$) (NSO Physics: Mechanics, Optics, Electricity, Magnetism and Gravitation Challenges)

(B)

Factor of 4

(C)

Factor of 3

(D)

Factor of 8

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Q2.

Chemistry (Stoichiometry): What mass of oxygen gas ($O_2$) is required for complete combustion of 16 grams of methane ($CH_4$) in 'NSO Physics: Mechanics, Optics, Electricity, Magnetism and Gravitation Challenges'? ($C=12, H=1, O=16$)

(A)

64 grams ($CH_4 + 2O_2 \to CO_2 + 2H_2O \implies 1\text{ mol } CH_4 \text{ needs } 2\text{ mol } O_2 = 64\text{ g}$) (NSO Physics: Mechanics, Optics, Electricity, Magnetism and Gravitation Challenges)

(B)

32 grams

(C)

48 grams

(D)

16 grams

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