Heisenberg Uncertainty Principle NEET Questions

Physical Chemistry - Atomic Structure

Heisenberg Uncertainty Principle MCQ Questions


1.
Heisenberg's uncertainty principle states that:
A.
The energy of an electron is quantized
B.
An electron behaves only as a particle
C.
Electrons revolve in fixed orbits around the nucleus
D.
It is impossible to determine the exact position and exact momentum of an electron simultaneously
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ANSWER :
D. It is impossible to determine the exact position and exact momentum of an electron simultaneously
2.
The mathematical expression of Heisenberg's uncertainty principle is:
A.
Δx · Δp ≥ h/4π
B.
Δx · Δp ≤ h/4π
C.
Δx · Δp ≥ h/2π
D.
Δx · Δp = h
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ANSWER :
A. Δx · Δp ≥ h/4π
3.
If the uncertainty in position of an electron is zero, the uncertainty in its momentum would be:
A.
Zero
B.
h/4π
C.
Infinite
D.
Less than h/4π
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ANSWER :
C. Infinite
4.
Heisenberg's uncertainty principle is significant for:
A.
Both microscopic and macroscopic equally
B.
Macroscopic objects only
C.
Stationary objects
D.
Microscopic particles like electrons
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ANSWER :
D. Microscopic particles like electrons
5.
The uncertainty principle was a consequence of:
A.
Bohr's atomic model
B.
Particle nature of matter only
C.
Wave nature of matter only
D.
Dual nature of matter and radiation
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ANSWER :
D. Dual nature of matter and radiation
6.
Calculate the uncertainty in velocity of an electron if uncertainty in its position is 1 Å (mass of electron = 9.1 × 10⁻³¹ kg, h = 6.626 × 10⁻³⁴ J·s):
A.
5.79 × 10⁴ m/s
B.
5.79 × 10⁷ m/s
C.
5.79 × 10⁵ m/s
D.
5.79 × 10⁶ m/s
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ANSWER :
C. 5.79 × 10⁵ m/s