NTS 2026 NAT ICS Test Physics Dawn of Modern Physics Free Quiz 2

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NTS 2026 NAT ICS Test Physics Dawn of Modern Physics Free Quiz 2

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NTS 2026 NAT ICS Test Physics Dawn of Modern Physics Free Quiz 2

Practice NTS 2026 NAT ICS Dawn of Modern Physics MCQs. Get instant results with Explanation.

General8 MCQs

1. 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

2. What is the wavelength range of X-rays?

A. 0.01 nm to 10 nmB. 1 m to 100 mC. 400 nm to 700 nmD. Less than 0.001 nm

3. Who discovered X-rays?

A. EinsteinB. RöntgenC. BohrD. Rutherford

4. What is the formula for the minimum wavelength of X-rays?

A. λ_min = eV/hcB. λ_min = h/eVC. λ_min = c/eVD. λ_min = hc/eV

General8 MCQs

5. What are atomic spectra?

A. Characteristic patterns of light emitted by atomsB. Continuous spectrumC. Spectrum of moleculesD. Spectrum of nuclei

6. What are emission spectra?

A. Absorption spectraB. Emission spectraC. Continuous spectraD. X-ray spectra

7. Why are atomic spectra useful for identification?

A. All elements have same spectrumB. Only gases have spectraC. Each element has a unique line spectrumD. Spectra cannot identify elements

8. What is the Rydberg formula?

A. 1/λ = R(n₁² - n₂²)B. 1/λ = R/(n₁² + n₂²)C. λ = R(1/n₁² - 1/n₂²)D. 1/λ = R(1/n₁² - 1/n₂²)

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