Multiple Choice Questions F.Sc-I,Ch#5 Atomic Structure

Multiple Choice Questions F.Sc-I Ch#5 Atomic Structure

Q.1 Heisenberg's uncertainty principle is contradicted by?
A) Lewis concept
B) Bohr's atomic model
C) Rutherford's model
D) Hund's rule
 Q.2 The radius of 1st orbit of hydrogen by Bohr's atomic model is
A) 0.529 'A
B) 2.11 'A
C) 4.75 'A
D) 8.40 'A
 Q.3 The volume of space in which there is ________ chance of finding an electron is called atomic orbital
A) 80%
B) 90%
C) 95%
D) 99%
 Q.4 The greater the frequency of X-rays,________ will be the uncertainty in the momentum of electron
A) Greater
B) Shorter
C) Equal
D) Less
 Q.5 If an electron is moving with a velocity of 2.188 × 10^6 m/s in the 1st orbit of hydrogen atom,its wavelength will be
A) 4.5 × 10^-3 nm
B) 0.33 nm
C) 1.8 × 10^-13 m
D) 0.33 × 10^-9 nm

 Answers:
Q.1  B
Q.2  A
Q.3  C
Q.4  A
Q.5  B