Objective Type Question On Class 12 Physics Chapter 12

(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

Answer: 2.22 MeV

(2) Artificial radioactivity was discovered by:

[A] Joliot

[B] Becquerel

[C] Pauli

[D] None of these

Answer: Joliot

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(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

Answer: Pauli

(4) Isotones have the same:

[A] A

[B] Z

[C] N

[D] All the above

Answer: N

(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

Answer: 10^-42

(6) Isobars have the same:

[A] A

[B] Z

[C] N

[D] All the above

Answer: A

(7) Who explained the splitting of special lines in magnetic field?

[A] Zeeman

[B] Bohr

[C] Summerfield

[D] Einstein

Answer: Zeeman

(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

Answer: 10 nano 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

Answer: 4 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

Answer: Er

(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)

Answer: 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

Answer: increases

(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

Answer: coulomb’s 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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