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Free download in PDF Class 12 Physics Chapter 12 Atoms Multiple Choice Questions and Answers for Board, JEE, NEET, AIIMS, JIPMER, IIT-JEE, AIEE and other competitive exams. MCQ Questions for Class 12 Physics with Answers were prepared based on the latest exam pattern. These short solved questions or quizzes are provided by Gkseries. These will help the students for preparation of their examination./p>
(1)
The binding energy of a deuteron is about:
[A]
2.22 MeV
[B]
2.22 J
[C]
2.22 eV
[D]
None of these
(2)
Artificial radioactivity was discovered by:
[A]
Joliot
[B]
Becquerel
[C]
Pauli
[D]
None of these
(3)
The principle that a quantum orbital cannot be occupied by more than two electrons was given by:
[A]
Pauli
[B]
Millikan
[C]
Hund
[D]
None of these
(4)
Isotones have the same:
[A]
A
[B]
Z
[C]
N
[D]
All the above
(5)
F
g and F
e represents the gravitational and electrostatic force respectively between two electrons situated at some distance the ratio
is if the order of:
[A]
9.8
[B]
109
[C]
1042
[D]
10-42
(6)
Isobars have the same:
[A]
A
[B]
Z
[C]
N
[D]
All the above
(7)
Who explained the splitting of special lines in magnetic field?
[A]
Zeeman
[B]
Bohr
[C]
Summerfield
[D]
Einstein
(8)
An atom stays in an excited state for about:
[A]
10 micro seconds
[B]
10 milli seconds
[C]
10 nano seconds
[D]
10 seconds
(9)
In terms of Bohr radius r0, the radius of the second Bohr orbit of a hydrogen atom is given by
[A]
4 r0
[B]
8 r0
[C]
√2 r0
[D]
2 r0
(10)
When an atomic gas or vapour is excited at low pressure, by passing an electric current through it then
[A]
emission spectrum is observed
[B]
absorption spectrucm is observed
[C]
band spectrum is observed
[D]
both (b) and (c)
Answer: emission spectrum is observed
(11)
When hydrogen atom is in its first excited level, it’s radius is
[A]
four times, it ground state radius
[B]
twice times, it ground state radius
[C]
same times, it ground state radius
[D]
half times, it ground state radius.
Answer: four times, it ground state radius
(12)
Which of the following in a hydrogen atom is independent of the principal quantum number n? (The symbols have their usual meanings).
[A]
νn
[B]
Er
[C]
En
[D]
νr
(13)
Which of the following parameters is the same for all hydrogen-like atoms and ions in their ground states?
[A]
Radius of the orbit
[B]
Speed of the electron
[C]
Energy of the atom
[D]
Orbital angular momentum of the electron
Answer: Orbital angular momentum of the electron
(14)
The electrons of Rutherford’s model would be expected to lose energy because, they
[A]
move randomly
[B]
jump on nucleus
[C]
radiate electromagnetic waves
[D]
escape from the atom
Answer: radiate electromagnetic waves
(15)
According to classical theory, Rutherford’s atomic model is
[A]
stable
[B]
unstable
[C]
meta stable
[D]
both (a) and (b)
(16)
As one considers orbits with higher values of n in a hydrogen atom, the electric potential energy of the atom
[A]
decreases
[B]
increases
[C]
remains the same
[D]
does not increase
(17)
Rutherford’s atomic model was unstable because
[A]
nuclei will break down
[B]
electrons do not remain in orbit
[C]
orbiting electrons radiate energy
[D]
electrons are repelled by the nucleus
Answer: electrons do not remain in orbit
(18)
Electrons in the atom are held to the nucleus by
[A]
coulomb’s force
[B]
nuclear force
[C]
vander waal’s force
[D]
gravitational force
(19)
The angular speed of the electron in the nth orbit of Bohr hydrogen atom is
[A]
directly proportional to n
[B]
inversely proportional to n
[C]
inversely proportional to n2
[D]
inversely proportional to n3
Answer: inversely proportional to n3
(20)
The significant result deduced from the Rutherford’s scattering experiment is that
[A]
whole of the positive charge is concentrated at the centre of atom
[B]
there are neutrons inside the nucleus
[C]
α-particles are helium nuclei
[D]
electrons are embedded in the atom
Answer: whole of the positive charge is concentrated at the centre of atom
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