The SPARK Institute of Language & Sciences

PHYSICS - II ATOMIC SPECTRA TEST 1

1. The branch of physics that deals with the investigation of wavelengths of electromagnetic
radiation emitted or absorbed by atoms is known as:
(a) Spectroscopy (b) Astroscopy (c) Radioscopy (d) Stereoscopy
2. Black body radiation spectrum is an example of:
(a) band spectra (b) continuous spectra
(c) discrete spectra (d) atomic spectra
3. Molecular spectra are an example of:
(a) continuous spectra (b) discrete spectra
(c) band spectra (d) atomic spectra
4. Atomic Spectra is an example of:
(a) discrete spectra (b) band spectra
(c) atomic spectra (d) continuous spectra
5. If an electron jumps from nth orbit of energy En to pth (lower) orbit of Energy Ep and a
photon of frequency f and wavelength 𝝀 is thus emitted than:
(a) f 𝜆=En-Ep (b) hc/𝜆=En-Ep (c) hf=Ep-En (d) h𝜆=Ep-En
6. The numerical value of ground state energy for hydrogen atom in eV is:
(a) 10 (b) -10 (c) -13.6 (d) -9.3
7. Line spectrum is obtained on the screen in the form of lines if the slit in the front of source is:
(a) Narrow square (b) broad square
(c) narrow rectangle (d) broad rectangle
8. The value of Rydberg constant is______.
(a) 1.07×107m-1 (b) 1.07×108m-1
(c) 1.07×109m-1 (d) 1.07×1011m-1
9. The relation between Rydberg constant RH and ground state energy Eo is:
(a) RH=Eo/hc (b) RH=hc/Eo
(c) Eo=RH/hc (d) RH=EohC
10. Balmer series lies in:
(a) UV region (b) Far UV region
(c) Infrared region (d) Visible region
11. The radius of 2nd orbit by a factor of:
(a) 2 (b) 4 (c) 8 (d) 16
Engr. Harish Kumar MDCAT 2022
The SPARK Institute of Language & Sciences
PHYSICS - II ATOMIC SPECTRA TEST 1
12. In order to obtain spectrum from the emitted radiation, the atomic gas or vapour must be
excited at:
(a) much less than atmospheric pressure (b) much high than atmospheric pressure
(c) atmospheric pressure (d) high pressure and temperature
13. The fact that the spectrum of any element contains wavelengths that exhibit definite
regularities was utilized in the second half of the ____ in identifying different elements.
(a) 16th century (b) 17th century (c) 18th century (d) 19th century
14. The radius of 10th Bohr orbit in hydrogen atom is:
(a) 0.053nm (b) 0.053nm (c) 5.29Ao (d) 15nm
15. The first Hydrogen spectral series was identified, in 1885, by:
(a) J.R.Rydber (b) J.J.Balmer
(c) Theodore Lyman (d) F. S. Brackett
16. The radius of 3rdbohr orbit in hydrogen atom is greater than the radius of 1st orbit by a
factor:
(a) 3 (b) 4 (c) 8 (d) 9
17. The only series which lies in the visible region of the electromagnetic spectrum is:
(a) Paschen series (b) Lyman series (c) Balmer series (d) Pfund series
18. The results obtained by the Balmer were formulated, in 1896, by:
(a) Theodore Lyman (b) F. S. Brackett
(c) J.R.Rydberg (d) J.J.Balmer
19. The total energy of electron in the state n=infinity of hydrogen atom is:
(a) zero (b) 13.63eV (c) 16.5eV (d) 18eV
20. The region where the Lyman series contains the wavelength 1/𝜆 = RH [1/ 12 1/ n2 ] is:
(a) visible region (b) infrared region
(c) ultraviolet region (d) none of these

21. The total number of spectral lines for an electron transition from n=5 to n=1 is:
(a) 1 (b) 5 (c) 10 (d) 15
22. Three spectral series, Paschen series, Brackett series, Pfund series are found in the
(a) ultraviolet region (b) visible region
(c) infrared region (d) Both a&b
23. When an electron absorbs energy, it jumps to:
Engr. Harish Kumar MDCAT 2022
The SPARK Institute of Language & Sciences
PHYSICS - II ATOMIC SPECTRA TEST 1
(a) Lower energy state (b) Higher energy state
(c) ground state (d) remains in the same state
24. The quantized Bohr orbit radius of electron in hydrogen atom is given by:
(a) n2r3 (b) nr1 (c) n2r2 (d) n2r1
25. Paschen series is obtained when all the transition of electron starts on:
(a) 2nd orbit (b) 3rd orbit (c) 4th orbit (d) 5th orbit
26. The amount of energy required to completely remove an electron from the first Bohr orbit
is:
(a) 13.6 MeV (b) 13.6 eV (c) 1.36 MeV (d) 1.36 eV
27. Which series lies in the Ultraviolet region?
(a) Lyman series (b) Paschen series
(c) Brackett series (d) Balmer series
28. The radius of hydrogen atom is about:
(a) 5 x 10-11 m (b) 5 x 10-11 cm
(c) 5 x 10-11 mm (d) 5 x 10-11 dm
29. The SI unit of Rydberg constant is:
(a) m (b) m2 (c) m-1 (d) m-2
30. Calculate the energy in eV of a quanta of wavelength of 𝜆 = 400nm
(a) 3.10 eV (b) 4.10 eV (c) 5.10 eV (d) 6.10

Engr. Harish Kumar MDCAT 2022

ANSWER KEY

1. a 2. b 3. c 4. a 5. b
6. c 7. c 8. a 9. a 10. d
11. b 12. a 13. d 14. c 15. b
16. d 17. b 18. c 19. a 20. c
21. b 22. c 23. b 24. d 25. b
26. b 27. a 28. a 29. c 30. a

Engr. Harish Kumar MDCAT 2022