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PU E Practice Physics Dawn of Modern Physics MCQs Test 1

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PU E Practice Physics Dawn of Modern Physics MCQs Test 1

Practice PU E 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 does the Stefan-Boltzmann law state?

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

4. 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

5. Who explained the photoelectric effect?

A. NewtonB. EinsteinC. MaxwellD. Planck

General10 MCQs

6. What is Einstein's photoelectric equation?

A. hf = φ - KB. hf = φ/KC. hf = φ + KD. hf = K/φ

7. What is the work function?

A. Kinetic energy of electronsB. Frequency of lightC. Wavelength of lightD. Minimum energy to remove electrons

8. 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

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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