MCQs of Atoms

Atoms MCQs

Showing 21 to 30 out of 146 Questions

21.

As the value of impact parameter is larger the scattering angle is _____

(a)	constant
(b)	smaller
(c)	larger
(d)	medium

22.

To explain his theory Bohr used _____

(a)	conversion of linear momentum
(b)	conversion of angular momentum
(c)	conversion of quantum frequency
(d)	conversion of energy

23.

The energy of an electron revolving in a stationary orbit is always negative because _____

(a)	electron possesses negative charge
(b)	the centripetal force acting on the electron
(c)	it is the binding energy of its orbit.
(d)	it cannot emits energy

24.

The value of ratio of energy of electron in ground state to Rydberg constant is _____

(a)	ch
(b)	-ch
(c)	$\frac{1}{c h}$
(d)	$- \frac{1}{c h}$

25.

The ratio of kinetic energy to total energy of an electron of an electron in n^th orbit for the Bohr model of hydrogen atom is _____

(a)	1
(b)	-1
(c)	2
(d)	12

26.

The ratio of wavelength of H_α and H_β line in Lymen series is _____

(a)	32 : 27
(b)	4 : 3
(c)	9 : 8
(d)	8 : 9

27.

The shortest wavelength in the Lymen series is 911.6 Å. Then the longest wavelength in the Lyman series is _____

(a)	1215 Å
(b)	∞
(c)	2430 Å
(d)	600 Å

28.

What happens when X-ray passes in air ?

(a)	produces path of light in the air
(b)	it ionized the air
(c)	makes smoke in air
(d)	it accelerated the air atoms

29.

The wavelength of K_α line of element having atomic number 57 is λ . Then the wavelength of K_α line of element atomic number 29 is _____

(a)	λ
(b)	2λ
(c)	4λ
(d)	8λ

30.

Ionization energy of mercury atom is 10.39 eV. If the electron achieved sufficient energy for ionizing the atom of mercury after covering distance d in the electric field of 1.5 × 10⁶ Vm^-1 then d = _____ m.

(a)	$\frac{10.39}{1.5 \times 10^{6}}$
(b)	10.39 × 1.5 × 10⁶
(c)	10.39 × 1.6 × 10^-19
(d)	$\frac{10.39 \times 1.6 \times 10^{- 19}}{1.5 \times 10^{6}}$

Showing 21 to 30 out of 146 Questions