PU CSS 2026 Dawn of Modern Physics Free Quiz 1

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PU CSS 2026 Dawn of Modern Physics Free Quiz 1

PU CSS Quiz

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Remaining: 10

Navigator 10 Q

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General 10 MCQs

1. What is a black body?

A. Absorbs all incident radiation B. Reflects all incident radiation C. Transmits all incident radiation D. Scatters all incident radiation

2. What did Planck propose about energy?

A. E = mc² B. E = hf C. E = ½mv² D. E = kT

3. What is the value of Planck's constant?

A. 6.626 × 10⁻³² J·s B. 6.626 × 10⁻³⁶ J·s C. 6.626 × 10⁻³⁴ J·s D. 6.626 × 10⁻³⁰ J·s

4. What does the Stefan-Boltzmann law state?

A. E = σT² B. E = σT³ C. E = σT⁵ D. E = σT⁴

5. What is the photoelectric effect?

A. Emission of electrons from metal when light falls B. Emission of light from heated metal C. Emission of electrons in electric field D. Emission of electrons by electron bombardment

6. Who explained the photoelectric effect?

A. Newton B. Einstein C. Maxwell D. Planck

7. What does Bohr's model state about electrons?

A. Electrons revolve in fixed orbits B. Electrons are randomly distributed C. Electrons exist in probability clouds D. Electrons are embedded in positive sphere

8. What is the quantization condition in Bohr's model?

A. mvr = nλ B. mvr = nh/2π C. mvr = nE D. mvr = nh

9. What is the formula for Bohr's orbit radius?

A. r = n² h²/ε₀ B. r = n² ε₀/π C. r = n² h² ε₀ / π m e² D. r = n² h²/π

10. What is the energy of electrons in Bohr's orbits?

A. E = -13.6/n B. E = -13.6/n³ C. E = -13.6n² D. E = -13.6/n²

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