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PU CSS 2026 Practice Test Physics Dawn of Modern Physics Free Quiz 1

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PU CSS 2026 Practice Test Physics Dawn of Modern Physics Free Quiz 1

Practice PU CSS 2026 Physics MCQs from Dawn of Modern Physics. Get instant results with Explanation.

General10 MCQs

1. What is a black body?

A. Absorbs all incident radiationB. Reflects all incident radiationC. Transmits all incident radiationD. Scatters all incident radiation

2. What did Planck propose about energy?

A. E = mc²B. E = hfC. E = ½mv²D. E = kT

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

A. 6.626 × 10⁻³² J·sB. 6.626 × 10⁻³⁶ J·sC. 6.626 × 10⁻³⁴ J·sD. 6.626 × 10⁻³⁰ J·s

4. What does the Stefan-Boltzmann law state?

A. E = σT²B. E = σT³C. E = σT⁵D. E = σT⁴

5. What is the photoelectric effect?

A. Emission of electrons from metal when light fallsB. Emission of light from heated metalC. Emission of electrons in electric fieldD. Emission of electrons by electron bombardment

General10 MCQs

6. Who explained the photoelectric effect?

A. NewtonB. EinsteinC. MaxwellD. Planck

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

A. Electrons revolve in fixed orbitsB. Electrons are randomly distributedC. Electrons exist in probability cloudsD. Electrons are embedded in positive sphere

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

A. mvr = nλB. mvr = nh/2πC. mvr = nED. mvr = nh

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

A. r = n² h²/ε₀B. r = n² ε₀/πC. r = n² h² ε₀ / π m e²D. r = n² h²/π

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

A. E = -13.6/nB. E = -13.6/n³C. E = -13.6n²D. E = -13.6/n²

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