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## Towards Quantum Mechanical Model of the Atom MCQs

**1. Determining the exact position and velocity of an electron is impossible at a time.**

a) True

b) False

**Answer: **True

**2. As per Heisenberg’s principle of uncertainty, the relation between relative momentum and relative position is __________**

a) independent

b) equal

c) directly proportional

d) inversely proportional

**Answer: **inversely proportional

**3. Δx. Δp ≥ h/4π.**

a) True

b) False

**Answer: **True

**4. ****An object has a mass of 6 kg and velocity of 10 m/s. The speed is measured with 5% a****ccuracy, then find out Δx in m.**

a) 0.12676 x 10^{-34}

b) 0.1566 x 10^{-34}

c) 0.176 x 10^{-34}

d) 0.276 x 10^{-34}

**Answer: **0.176 x 10^{-34}

**5. ****If the kinetic energy of an electron ****is 5J. Find out its wavelength.**

a) 0.313 x 10^{15} m/s

b) 3.013 x 10^{15} m/s

c) 3.310 x 10^{15} m/s

d) 3.313 x 10^{15} m/s

**Answer: **3.313 x 10^{15} m/s

**6. If the uncertainties in position and momentum are equal, then the uncertainty in position is given by ____**

a) √h/4π

b) √h4π

c) √h/4

d) √h/π

**Answer: **√h/4π

**7. ****The uncertainty of a ball is given by 0.5A°. Then calcula****te the uncertainty in momentum.**

a) 2.055 x 10^{-24} kgm/s

b) 1.015 x 10^{-24} kgm/s

c) 1.055 x 10^{-24} kgm/s

d) 1.095 x 10^{-24} kgm/s

**Answer: **1.055 x 10^{-24} kgm/s

**8. ****Mass of a photon is given by 3.313 x 10**^{-34}** kg. Find it’s wavelength.**

^{-34}

a) 0.67A°

b) 0.67nm

c) 0.37A°

d) 1.67A°

**Answer: **0.67A°

**9. ****A ball of mass 0.5kg is moving with velocity 6.626 m/s. What****’s the wavelength of that ball?**

a) 1 x 10^{-34} m

b) 2 x 10^{-34} m

c) 2 x 10^{-32} m

d) 2 x 10^{-3} m

**Answer: **2 x 10^{-34} m

**10. Who found out about dual behavior of a matter?**

a) De Broglie

b) Bohr

c) Rutherford

d) Thomson

**Answer: **De Broglie