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question_answer1)
The uncertainty principle was enunciated by [NCERT 1975; Bihar MEE 1997]
A)
Einstein done
clear
B)
Heisenberg done
clear
C)
Rutherford done
clear
D)
Pauli done
clear
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question_answer2)
According to heisenberg uncertainty principle [AMU 1990; BCECE 2005]
A)
\[E=m{{c}^{2}}\] done
clear
B)
\[\Delta x\times \Delta p\ge \frac{h}{4\pi }\] done
clear
C)
\[\lambda =\frac{h}{p}\] done
clear
D)
\[\Delta x\times \Delta p=\frac{h}{6\pi }\] done
clear
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question_answer3)
?The position and velocity of a small particle like electron cannot be simultaneously determined.? This statement is [NCERT 1979; BHU 1981, 87]
A)
Heisenberg uncertainty principle done
clear
B)
Principle of de Broglie's wave nature of electron done
clear
C)
Pauli's exclusion principle done
clear
D)
Aufbau's principle done
clear
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question_answer4)
In Heisenberg's uncertainty equation \[\Delta x\times \Delta p\ge \frac{h}{4\pi }\]; \[\Delta p\] stands for
A)
Uncertainty in energy done
clear
B)
Uncertainty in velocity done
clear
C)
Uncertainty in momentum done
clear
D)
Uncertainty in mass done
clear
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question_answer5)
Which one is not the correct relation in the following
A)
\[h=\frac{E}{v}\] done
clear
B)
\[E=m{{c}^{2}}\] done
clear
C)
\[\Delta x\times \Delta p=\frac{h}{4\pi }\] done
clear
D)
\[\lambda =\frac{h}{mv}\] done
clear
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question_answer6)
The maximum probability of finding an electron in the \[{{d}_{xy}}\] orbital is [MP PET 1996]
A)
Along the x-axis done
clear
B)
Along the y-axis done
clear
C)
At an angle of \[{{45}^{o}}\] from the \[x\] and y-axes done
clear
D)
At an angle of \[{{90}^{o}}\] from the \[x\] and y-axes done
clear
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question_answer7)
Simultaneous determination of exact position and momentum of an electron is [BHU 1979]
A)
Possible done
clear
B)
Impossible done
clear
C)
Sometimes possible sometimes impossible done
clear
D)
None of the above done
clear
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question_answer8)
If uncertainty in the position of an electron is zero, the uncertainty in its momentum would be [CPMT 1988]
A)
Zero done
clear
B)
\[<\frac{h}{2\lambda }\] done
clear
C)
\[>\frac{h}{2\lambda }\] done
clear
D)
Infinite done
clear
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question_answer9)
The possibility of finding an electron in an orbital was conceived by [MP PMT 1994]
A)
Rutherford done
clear
B)
Bohr done
clear
C)
Heisenberg done
clear
D)
Schrodinger done
clear
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question_answer10)
Uncertainty principle gave the concept of
A)
Probability done
clear
B)
An orbital done
clear
C)
Physical meaning of \[\Psi \] the \[{{\Psi }^{2}}\] done
clear
D)
All the above done
clear
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question_answer11)
The uncertainty principle and the concept of wave nature of matter was proposed by ...... and ...... respectively [MP PET 1997]
A)
Heisenberg, de Broglie done
clear
B)
de-Broglie, Heisenberg done
clear
C)
Heisenberg, Planck done
clear
D)
Planck, Heisenberg done
clear
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question_answer12)
The uncertainty in momentum of an electron is \[1\times {{10}^{-5}}kg-m/s\]. The uncertainty in its position will be (\[h=6.62\times {{10}^{-34}}kg-{{m}^{2}}/s\]) [AFMC 1998; CBSE PMT 1999; JIPMER 2002]
A)
\[1.05\times {{10}^{-28}}m\] done
clear
B)
\[1.05\times {{10}^{-26}}m\] done
clear
C)
\[5.27\times {{10}^{-30}}m\] done
clear
D)
\[5.25\times {{10}^{-28}}m\] done
clear
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question_answer13)
The uncertainty in the position of a moving bullet of mass 10 gm is \[{{10}^{-5}}m\]. Calculate the uncertainty in its velocity [DCE 1999]
A)
\[5.2\times {{10}^{-28}}m/sec\] done
clear
B)
\[3.0\times {{10}^{-28}}m/sec\] done
clear
C)
\[5.2\times {{10}^{-22}}m/sec\] done
clear
D)
\[3\times {{10}^{-22}}m/sec\] done
clear
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question_answer14)
The equation \[\Delta x.\Delta p\ge \frac{h}{4\pi }\] shows [MP PET 2000]
A)
de-Broglie relation done
clear
B)
Heisenberg?s uncertainty principle done
clear
C)
Aufbau principle done
clear
D)
Hund?s rule done
clear
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question_answer15)
Which quantum number is not related with Schrodinger equation [RPMT 2002]
A)
Principal done
clear
B)
Azimuthal done
clear
C)
Magnetic done
clear
D)
Spin done
clear
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question_answer16)
Uncertainty in position of a 0.25 g particle is \[{{10}^{-5}}\]. Uncertainty of velocity is \[(h=6.6\times {{10}^{-34}}\,Js)\] [AIEEE 2002]
A)
\[1.2\times {{10}^{34}}\] done
clear
B)
\[2.1\times {{10}^{-29}}\] done
clear
C)
\[1.6\times {{10}^{-20}}\] done
clear
D)
\[1.7\times {{10}^{-9}}\] done
clear
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question_answer17)
The uncertainty in momentum of an electron is \[1\times {{10}^{-5}}kg\,m/s\]. The uncertainity in its position will be \[(h=6.63\times {{10}^{-34}}Js)\] [Pb. CET 2000]
A)
\[5.28\times {{10}^{-30}}m\] done
clear
B)
\[5.25\times {{10}^{-28}}m\] done
clear
C)
\[1.05\times {{10}^{-26}}m\] done
clear
D)
\[2.715\times {{10}^{-30}}m\] done
clear
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question_answer18)
According to Heisenberg?s uncertainty principle, the product of uncertainties in position and velocities for an electron of mass \[9.1\times {{10}^{-31}}kg\] is [BHU 2004]
A)
\[2.8\times {{10}^{-3}}{{m}^{2}}{{s}^{-1}}\] done
clear
B)
\[3.8\times {{10}^{-5}}{{m}^{2}}{{s}^{-1}}\] done
clear
C)
\[5.8\times {{10}^{-5}}{{m}^{2}}{{s}^{-1}}\] done
clear
D)
\[6.8\times {{10}^{-6}}{{m}^{2}}{{s}^{-1}}\] done
clear
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question_answer19)
For an electron if the uncertainty in velocity is \[\Delta \nu \], the uncertainty in its position \[(\Delta x)\] is given by [DPMT 2005]
A)
\[\frac{hm}{4\pi \Delta \nu }\] done
clear
B)
\[\frac{4\pi }{hm\Delta \nu }\] done
clear
C)
\[\frac{h}{4\pi m\Delta \nu }\] done
clear
D)
\[\frac{4\pi \ m}{h\ .\ \Delta \nu }\] done
clear
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question_answer20)
Orbital is [DPMT 2005]
A)
Circular path around the nucleus in which the electron revolves done
clear
B)
Space around the nucleus where the probability of finding the electron is maximum done
clear
C)
Amplitude of electrons wave done
clear
D)
None of these done
clear
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