Heisenberg Uncertainty Principle NEET Questions

Physical Chemistry - Atomic Structure

Heisenberg Uncertainty Principle MCQ Questions


7.
Heisenberg's uncertainty principle rules out the existence of:
A.
Definite paths or trajectories of electrons
B.
Quantized energy levels
C.
Wave nature of electrons
D.
Atoms
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ANSWER :
A. Definite paths or trajectories of electrons
8.
Which of the following pairs cannot be measured simultaneously with arbitrary precision?
A.
Position and energy
B.
Both B and C
C.
Energy and time
D.
Position and momentum
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ANSWER :
B. Both B and C
9.
The uncertainty in momentum of an electron whose position is determined within ±0.1 Å is approximately:
A.
5.27 × 10⁻²² kg·m/s
B.
5.27 × 10⁻²⁴ kg·m/s
C.
5.27 × 10⁻²⁵ kg·m/s
D.
5.27 × 10⁻²⁰ kg·m/s
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ANSWER :
B. 5.27 × 10⁻²⁴ kg·m/s
10.
If the uncertainty in velocity of a particle is equal to its actual velocity, the uncertainty in position would be:
A.
Infinite
B.
Zero
C.
Equal to h/4πmv
D.
Equal to wavelength
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ANSWER :
C. Equal to h/4πmv
11.
Heisenberg's uncertainty principle gives the relation between uncertainties in:
A.
Mass and velocity
B.
Position and velocity
C.
Charge and mass
D.
Energy and frequency
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ANSWER :
B. Position and velocity
12.
Why does Heisenberg's uncertainty principle not apply significantly to macroscopic objects?
A.
Because mass is too large making h/4πm negligible
B.
Because they obey Newton's laws
C.
Because they don't move
D.
Because they have no wave nature
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ANSWER :
A. Because mass is too large making h/4πm negligible