Structure of Atom Class 9 MCQ. We covered all the Structure of Atom Class 9 MCQ in this post for free so that you can practice well for the exam.
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MCQ on Structure of Atom for NEET Students
An atom absorbs a UV photon of 200 nm and re-emits two photons. If the wavelength of one of the emitted photons is 700 nm. The wavelength of the second emitted photon will be ……….
(A) 900 nm
(B) 500 nm
(C) 280 nm
(D) 7000 nm
Option c – 280 nm
In hydrogen atoms, if the radius of an orbit is made four times that of a smaller orbit, then the angular momentum of an electron becomes ……….. the angular momentum of an electron in a smaller orbit.
(A) twice
(B) half
(C) four times
(D) thrice
Option a – twice
Which one of the following has the least energy?
(A) n = 3, 1 = 2
(B) n=2, l=1
(C) n = 3, l = 1
(D) n = 4, l=0
Option b – n=2, l=1
The mass of an electron is equal to the mass of a/an ……….
(A) alpha particle
(B) beta particle
(C) neutron
(D) gamma rays
Option b – beta particle
Select the number of electrons that have n = 2 and s = +1/2.
(A) 3
(B) 4
(C) 8
(D) 9
Option b – 4
The orbital angular momentum of an electron depends on ………..
(A) only l
(B) only n and l
(C) only n and m
(D) only m and l
Option a – only l
The spectral line corresponding to the transition of an electron in the H-atom from the 4th orbit to the 3rd orbit is known as ………. series.
(A) Balmer
(B) Brackett
(C) Paschen
(D) Pfund
Option c – Paschen
Violet light can eject electrons from the surface of potassium metal but red light cannot because ……….
(A) the intensity of violet light is greater than red light and is enough to eject electrons
(B) the wavelength of violet light is greater than red light and is enough to eject electrons
(C) the frequency of red light is lower than violet light and is not enough to eject electrons
(D) none of these
Option c – the frequency of red light is lower than violet light and is not enough to eject electrons
If the magnetic quantum number of an electron is represented by – 3, then which of the following can be its principal quantum number?
(A) 2
(B) 3
(C) 4
(D) 1
Option c – 4
An electron revolving around the nucleus behaves as a standing wave only when the circumference is equal to ………
(A) the radius of an orbit
(B) fractional multiple of the wavelength
(C) the velocity of an electron
(D) an integral multiple of the wavelength
Option d – an integral multiple of the wavelength
Which of the following is CORRECT for both cathode rays and anode rays?
(A) The particles of both rays travel in a straight line and in the same direction.
(B) In the presence of an electric field, both the rays deflect towards the negative electrode.
(C) Both rays are affected by a magnetic field.
(D) The particles of both rays are electrically neutral.
Option c – Both rays are affected by a magnetic field.
The orbitals described by the following quantum numbers are ……….. respectively. (1) n = 5,1 = 3 (II) n = 6,1=0
(A) (I) = 5f; (II) = 6s
(B) (1)=5s; (II) = 6f
(C) (I) = 5d; (II) = 6s
(D) (I) = 5f; (II) = 6p
Option a – (I) = 5f; (II) = 6s
For an electron in Bohr’s orbit, the energy difference between successive orbits in hydrogen atom when going away from the nucleus ………..
(A) increases
(B) remain unchanged
(C) decreases
(D) first decreases and then increases
Option c – decreases
When an electron jumps from n = 3 to n = 1 in Bohr’s atom, the possible number of spectral lines is/are ………
(A) 4
(B) 2
(C) 1
(D) 3
Option d – 3
The orbitals, 2px and 2py differ in their ……..
(A) orientation
(B) shape
(C) energy
(D) size
Option a – orientation
The ionization energy of a hydrogen atom is ……..
(A) 13.6 eV
(B) 4.08 eV
(C) 5.44 eV
(D) 2.72 eV
Option a – 13.6 eV
Bohr’s model can be applied to ……….
(A) elements containing more than one electron
(B) ions containing more than one electron
(C) atoms or ions containing one electron
(D) only hydrogen atom
Option c – atoms or ions containing one electron
The ratio of the energies of photons of 3000 Å to that of 9000 Å is ……….
(A) 3 : 1
(B) 9 : 1
(C) 1 : 3
(D) 1 : 9
Option a – 3 : 1
The number of radial nodes for 4d orbital is ……..
(A) 1
(B) 2
(C) 3
(D) 4
Option a – 1
The charge-to-mass ratio of cathode ray particles obtained by using helium gas is ………. that of obtained by using hydrogen gas.
(A) greater than
(B) smaller than
(C) half
(D) equal to
Option d – equal to
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