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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% accuracy, 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 10¹⁵ m/s

b) 3.013 x 10¹⁵ m/s

c) 3.310 x 10¹⁵ m/s

d) 3.313 x 10¹⁵ m/s

Answer: 3.313 x 10¹⁵ 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 calculate 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.

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

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Categories: Structure of Atom