Postulates Of Quantum Mechanics MCQ Level - 1
10 Questions MCQ Test Topic wise Tests for IIT JAM Physics | Postulates Of Quantum Mechanics MCQ Level - 1
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A certain excited state of hydrogen atom is known to have a life of 2.5 × 10–14 s. The minimum error, with which the energy of the excited state can be measured is.
The energy time uncertainty relation is
The correct answer is: 0.026 eV
Which of the following is the eigenfunction of the linear momentum operator 
with a positive eigenvalue 
with a positive eigenvalue 
Compare this with
is the eigenvalue
The correct answer is: eikx
An eigenfunction of an operator 
The corresponding eigenvalue is.
The corresponding eigenvalue is.
The correct answer is: α2
The ground state energy of an electron confined to a box 1Å wide is.
a = 1 * 10-10m m = 9.1 * 10-31kg
Energy of electron in ground state
E1 = h2/8ma2
⇒ [(6.625 * 10-34)2]/(8 * 9.1 * 10-31 * 1 * 10-10)2
E1 = 6.016 * 10-18 J
Which of the following values of A will properly normalize the wave function of a rigid dumbbell rotating about its centre having φ dependence as ψ(φ) = Aeimφ where m is a quantum number.
For normalization
The correct answer is: 
A particle of mass m has the wave function ψ(x, t) = eiωt (α cos kx + β sin kx) where α, β are complex constants and ω and k are real constants. The probability current density is equal to :
Probability current density 
subtract (2) and (1)
If de-Broglie wavelength of an electron is 7.3Å. Then the velocity of electron is. Given, me = 9.1 × 10–31 kg and h = 6.6 × 10–34 Js.
Λ = h/mv
v = h/mΛ
v = (6.6*10-34)/(9.1 × 10–31 * 7.3 * 10-10)
= 9.93 × 104 m/s
The correct answer is: 9.93 × 104 m/s
Which of the following is correct set of eigenvalues of the Hermitian matrix 
The correct answer is: 1, 3
If ψ is a normalized solution of the Schrödinger equation and Q is the operator corresponding to a physical quantity x, then the quantity 
may be integrated in order to obtain :
The correct answer is: mean value of x
A particle limited to the x–axis has the wave frequency ψ = ax between x = 0 and x = 1, ψ = 0 elsewhere. The expectation value 
of the particle's position is.
The correct answer is: a2/4
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