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.

SOF NSO (Optics): A ray of light passes from glass (refractive index $\mu = 1.5$) into air in 'NSO Physics: Mechanics, Optics, Electricity, Magnetism and Gravitation Challenges'. What is the sine of the critical angle $\sin \theta_c$ for Total Internal Reflection?

(A)

$\frac{2}{3}$ ($\sin \theta_c = \frac{1}{\mu} = \frac{1}{1.5} = \frac{2}{3}$) (NSO Physics: Mechanics, Optics, Electricity, Magnetism and Gravitation Challenges)

(B)

$\frac{{3}}{{2}}$

(C)

$\frac{{1}}{{2}}$

(D)

$\frac{{\sqrt{{3}}}}{{2}}$

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Q2.

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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