INTELLIGENCE ACADEMY

1. IN HYDROGEN SPECTRUM, THE SERIES LYING IN THE VISIBLE REGION

IS:
A) LYMAN
B) BALMER
C) PASCHEN
D) BRACKETT

2. WHICH OF THE FOLLOWING TRANSITIONS IN HYDROGEN ATOM EMITS

A PHOTON OF THE LONGEST WAVELENGTH?
A)
B)
C)
D)

3. THE NUMBER OF SPECTRAL LINES WHEN ELECTRON JUMPS FROM TO

IS:
A) 10
B) 6
C) 15
D) 4

4. THE IONIZATION ENERGY OF HYDROGEN ATOM IS:

A) 13.6 EV
B) 3.4 EV
C) 1.51 EV
D) 0.85 EV

5. THE ENERGY DIFFERENCE BETWEEN TWO ORBITS IS MAXIMUM FOR

TRANSITION BETWEEN:
A) N=5 TO N=4
B) N=2 TO N=1
C) N=3 TO N=2
D) N=4 TO N=3

6. THE WAVE NUMBER OF SPECTRAL LINE IN HYDROGEN ATOM IS

DIRECTLY PROPORTIONAL TO:
2
A)
B)
C)
D)

7. THE BALMER SERIES CORRESPONDS TO TRANSITIONS ENDING AT:

A) N=1
B) N=2
C) N=3
D) N=4

8. WHICH SERIES LIES IN INFRARED REGION?

A) BALMER
B) LYMAN
C) PASCHEN
D) NONE

9. THE SPECTRAL LINES CONVERGE AT:

A) LOWER ENERGY LEVELS
3
B) HIGHER ENERGY LEVELS
C) SAME ENERGY LEVELS
D) MIDDLE ENERGY LEVELS

10. THE RATIO OF THE LONGEST WAVELENGTH TO THE SHORTEST

WAVELENGTH IN THE BALMER SERIES IS APPROXIMATELY:
A) 1:4
B) 4:9
C) 9:5
D) 5:4

11. THE NUMBER OF LINES FORMED WHEN ELECTRON DROPS FROM N=4
TO N=1:
A) 3
B) 4
C) 5
D) 6

12. THE FIRST LINE OF LYMAN SERIES IS DUE TO TRANSITION:

4
A) N=2 TO N=1
B) N=3 TO N=2
C) N=4 TO N=3
D) N=5 TO N=4

13. THE WAVELENGTH OF SECOND LINE OF BALMER SERIES IS CALLED:

A)
B)
C)
D)

14. FOR MAXIMUM ENERGY EMISSION IN HYDROGEN, THE ELECTRON

SHOULD FALL FROM:
A) N=2 TO N=1
B) N=∞ TO N=1
C) N=3 TO N=2
D) N=4 TO N=3

5
15. THE NUMBER OF POSSIBLE TRANSITIONS WHEN ELECTRON JUMPS
FROM 6 TH ORBIT TO 1 ST ORBIT IS:
A) 15
B) 10
C) 5
D) 20

16. IN BOHR’S MODEL, THE RADIUS OF THE NTH ORBIT IS PROPORTIONAL

TO:
A)
B)
C)
D)

17. THE MINIMUM ENERGY REQUIRED TO IONIZE HYDROGEN ATOM FROM

ITS GROUND STATE IS:
A) 13.6 EV
B) 3.4 EV
C) 6.8 EV
6
D) 1.5 EV

18. WHICH LINE CORRESPONDS TO THE HIGHEST FREQUENCY IN BALMER

SERIES?
A)
B)
C)
D)

19. THE RYDBERG CONSTANT HAS THE DIMENSION OF:

A) FREQUENCY
B) ENERGY
C) WAVE NUMBER
D) WAVELENGTH

20. THE THIRD LINE OF LYMAN SERIES CORRESPONDS TO TRANSITION:

A) 4→1
B) 5→1
C) 3→1
7
D) 6→1

21. THE MAXIMUM NUMBER OF SPECTRAL LINES FOR A TRANSITION FROM

N=3 TO N=1:
A) 1
B) 2
C) 3
D) 4

22. IN HYDROGEN, THE FREQUENCY OF A PHOTON EMITTED IN

TRANSITION FROM N=3 TO N=2 IS PROPORTIONAL TO:
A)
B)
C)
D)

23. THE UNIT OF RYDBERG CONSTANT IS:

A)
B)
8
C)
D)

24. THE TRANSITION THAT WILL EMIT PHOTON OF MINIMUM ENERGY IN

HYDROGEN ATOM WILL BE:
A) 2→1
B) 3→2
C) 4→3
D) 5→4

25. WHICH LINE BELONGS TO THE BALMER SERIES?

A) TRANSITION FROM 4 TO 2
B) TRANSITION FROM 3 TO 1
C) TRANSITION FROM 2 TO 1
D) TRANSITION FROM 5 TO 3

26. IN BOHR’S MODEL, THE VELOCITY OF ELECTRON IN NTH ORBIT IS

PROPORTIONAL TO:
A) N
9
B)
C)
D)

27. THE SPECTRAL SERIES ENDING AT N=3 IS CALLED:

A) LYMAN SERIES
B) BALMER SERIES
C) PASCHEN SERIES
D) PFUND SERIES

28. THE NUMBER OF SPECTRAL LINES WHEN ELECTRON DROPS FROM 7 TH

ORBIT TO 1 ST ORBIT IS:
A) 15
B) 21
C) 28
D) 6

29. WHICH TRANSITION PRODUCES THE SHORTEST WAVELENGTH

PHOTON?
10
A) 3→2
B) 4→3
C) 5→4
D) 2→1

30. IF THE WAVELENGTH OF LYMAN-ALPHA TRANSITION IS Λ, THEN THE

WAVELENGTH OF BALMER-ALPHA TRANSITION IS APPROXIMATELY:
A) 2Λ
B) 3Λ
C) 4Λ
D) 5Λ

ANSWER KEY
1) B
2) D
3) A
4) A
5) B

11
6) A
7) B
8) C
9) B
10) B
11) B
12) A
13) B
14) B
15) A
16) B
17) A
18) D
19) C
20) A
21) C
22) B
23) A
24) D
12
25) A
26) B
27) C
28) B
29) D
30) C

1. IN HYDROGEN ATOM, THE SPECTRAL LINES GET CLOSER TOGETHER AT:

A) LOWER ENERGIES
B) HIGHER ENERGIES
C) MIDDLE ENERGIES
D) NO PARTICULAR PATTERN

2. THE FREQUENCY OF RADIATION EMITTED WHEN ELECTRON FALLS

FROM TO IS:
A) GREATER THAN FROM 3 TO 2
B) LESS THAN FROM 3 TO 2
C) EQUAL TO FROM 3 TO 2

13
D) ZERO

3. FOR BALMER SERIES, THE VALUE OF IS:

A) 1
B) 2
C) 3
D) 4

4. THE EMISSION SPECTRUM OF HYDROGEN ATOM IS:

A) CONTINUOUS
B) LINE SPECTRUM
C) BAND SPECTRUM
D) ABSORPTION SPECTRUM

5. THE RATIO OF ENERGIES OF PHOTONS EMITTED IN LYMAN AND

BALMER SERIES FOR SAME IS:
A) 1
B) 2
C) 3
14
D) 4

6. THE FIRST LINE OF PASCHEN SERIES IS DUE TO TRANSITION:

A) 4→3
B) 3→2
C) 5→3
D) 6→3

7. THE PASCHEN SERIES FALLS IN:

A) VISIBLE REGION
B) UV REGION
C) IR REGION
D) X-RAY REGION

8. IN BOHR’S MODEL, ENERGY OF ELECTRON IS DIRECTLY PROPORTIONAL

TO:
A) N
B)
C)
15
D)

9. THE ENERGY OF NTH ORBIT IN HYDROGEN ATOM IS:

A) POSITIVE
B) NEGATIVE
C) ZERO
D) INFINITE

10. THE RATIO OF RADII OF 2 ND AND 1 ST ORBIT IN HYDROGEN ATOM IS:

A) 1:2
B) 2:1
C) 1:4
D) 4:1

11. THE SPECTRAL LINE AT 6563 Å BELONGS TO:

A) LYMAN SERIES
B) BALMER SERIES
C) PASCHEN SERIES
D) BRACKETT SERIES
16
12. THE IONIZATION POTENTIAL OF HYDROGEN IS:
A) 3.4 V
B) 6.8 V
C) 13.6 V
D) 27.2 V

13. THE MAXIMUM WAVELENGTH IN BALMER SERIES IS WHEN THE

TRANSITION IS FROM:
A) 3→2
B) 4→2
C) 5→2
D) 6→2

14. THE LOWEST FREQUENCY IN LYMAN SERIES CORRESPONDS TO

TRANSITION:
A) 2→1
B) 3→1
C) 4→1
17
D) ∞→1

15. THE FIRST LINE OF BALMER SERIES IS:

A)
B)
C)
D)

16. WHICH TRANSITION HAS THE MAXIMUM ENERGY GAP?

A) 2→1
B) 3→2
C) 4→3
D) 5→4

17. IN HYDROGEN SPECTRUM, THE LINES ARE CLASSIFIED INTO SERIES

BASED ON:
A) FINAL ORBIT
B) INITIAL ORBIT
C) BOTH INITIAL AND FINAL
18
D) FREQUENCY RANGE

18. IF AN ELECTRON IN HYDROGEN ATOM JUMPS FROM N=6 TO N=2, THE

LINE LIES IN:
A) UV REGION
B) VISIBLE REGION
C) IR REGION
D) X-RAY REGION

19. THE SERIES LIMIT OF BALMER SERIES LIES IN:

A) UV REGION
B) VISIBLE REGION
C) IR REGION
D) MICROWAVE REGION

20. THE WAVELENGTH OF A SPECTRAL LINE INCREASES WHEN:

A) ENERGY DIFFERENCE INCREASES
B) ENERGY DIFFERENCE DECREASES
C) NO RELATION
19
D) FREQUENCY INCREASES

21. THE MAXIMUM ENERGY EMITTED CORRESPONDS TO:

A) LONGEST WAVELENGTH
B) SHORTEST WAVELENGTH
C) MIDDLE WAVELENGTH
D) CONSTANT WAVELENGTH

22. THE PFUND SERIES LIES IN WHICH REGION?

A) VISIBLE
B) UV
C) IR
D) MICROWAVE

23. THE MINIMUM ENERGY OF A PHOTON IN LYMAN SERIES IS

ASSOCIATED WITH TRANSITION:
A) 2→1
B) 3→1
C) 4→1
20
D) ∞→1

24. THE LONGEST WAVELENGTH PHOTON IN LYMAN SERIES IS EMITTED

WHEN ELECTRON FALLS FROM:
A) 2 TO 1
B) 3 TO 1
C) 4 TO 1
D) 5 TO 1

25. THE TRANSITION FROM EMITS PHOTON OF ENERGY:

A) LESS THAN 2→1
B) MORE THAN 2→1
C) EQUAL TO 2→1
D) ZERO

26. THE RADIUS OF NTH ORBIT IS PROPORTIONAL TO:

A) N
B)
C)
21
D)

27. WHAT WILL BE THE RATIO OF VELOCITIES OF ELECTRON IN 2 ND AND

4 TH ORBIT?
A) 2:1
B) 1:2
C) 2:4
D) 4:2

28. WHICH ORBIT HAS THE LEAST NEGATIVE ENERGY?

A) 1 S T ORBIT
B) 2 ND ORBIT
C) 3 RD ORBIT
D) ∞ ORBIT

29. AN ELECTRON FROM N=5 JUMPS TO N=3. THE WAVELENGTH WILL BE

IN:
A) UV
B) VISIBLE
22
C) IR
D) X-RAY

30. IF AN ELECTRON JUMPS FROM N=6 TO N=1, THE EMITTED RADIATION

LIES IN:
A) VISIBLE REGION
B) IR REGION
C) UV REGION
D) X-RAY REGION

ANSWER KEY

1) B
2) A
3) B
4) B
5) B
6) A
7) C
8) D
9) B
10) D
11) B
23
12) C
13) A
14) C
15) A
16) A
17) A
18) B
19) A
20) B
21) B
22) C
23) A
24) A
25) A
26) B
27) A
28) D
29) C
30) C

1. IN HYDROGEN ATOM, ENERGY OF ELECTRON IN NTH ORBIT IS

PROPORTIONAL TO:
A)
B)
C)

24
D)

2. THE WAVELENGTH OF LINE IN BALMER SERIES IS ABOUT:

A) 656 NM
B) 486 NM
C) 410 NM
D) 434 NM

3. IN LYMAN SERIES, THE TRANSITION STARTS FROM:

A) N=1
B) N=2
C) N=3
D) N=4

4. WHICH OF THE FOLLOWING TRANSITIONS EMITS A PHOTON WITH

MAXIMUM ENERGY?
A) 3→2
B) 2→1
C) 4→3
25
D) 5→4

5. WHICH SERIES IN HYDROGEN SPECTRUM IS INVISIBLE TO NAKED EYES?

A) BALMER
B) LYMAN
C) BOTH A AND B
D) NONE

6. RYDBERG CONSTANT FOR HYDROGEN ATOM IN SI UNIT IS NEARLY:

A)
B)
C)
D)

7. WHICH SERIES TERMINATES AT N=4 LEVEL?

A) LYMAN
B) PASCHEN
C) BRACKETT
D) PFUND
26
8. WAVELENGTH CORRESPONDING TO LYMAN-ALPHA TRANSITION IS
APPROXIMATELY:
A) 656 NM
B) 121.5 NM
C) 486 NM
D) 97.2 NM

9. THE SPEED OF AN ELECTRON IN THE FIRST BOHR ORBIT OF HYDROGEN

IS APPROXIMATELY:
A)
B)
C)
D)

10. THE RADIUS OF FIRST BOHR ORBIT IS:

A)
B)
C)
27
D)

11. THE ENERGY DIFFERENCE BETWEEN N=2 AND N=1 IN HYDROGEN ATOM
IS:
A) 10.2 EV
B) 12.1 EV
C) 13.6 EV
D) 1.51 EV

12. THE ENERGY REQUIRED TO EXCITE HYDROGEN ATOM FROM GROUND

STATE TO SECOND EXCITED STATE IS:
A) 10.2 EV
B) 12.1 EV
C) 13.6 EV
D) 3.4 EV

13. THE IONIZATION ENERGY OF HE ^+ ION IS:

A) 13.6 EV
B) 27.2 EV
28
C) 54.4 EV
D) 68 EV

14. FOR HE ^+ ION, THE WAVELENGTH OF FIRST LINE OF LYMAN

SERIES IS:
A) HALF OF HYDROGEN
B) SAME AS HYDROGEN
C) ONE-FOURTH OF HYDROGEN
D) TWICE OF HYDROGEN

15. IN BOHR’S MODEL, TIME PERIOD OF ELECTRON IN NTH ORBIT IS

PROPORTIONAL TO:
A)
B)
C)
D)

16. NUMBER OF POSSIBLE SPECTRAL LINES FOR TRANSITION FROM N=4:

A) 6
29
B) 10
C) 4
D) 3

17. BALMER SERIES CORRESPONDS TO TRANSITIONS WHERE FINAL ORBIT

IS:
A) N=1
B) N=2
C) N=3
D) N=4

18. IF ENERGY OF GROUND STATE IS -13.6 EV, ENERGY OF 2 ND ORBIT IS:

A) -3.4 EV
B) -6.8 EV
C) -1.5 EV
D) 0 EV

19. MAXIMUM NUMBER OF LINES EMITTED WHEN ELECTRON FALLS FROM

5 TH LEVEL IS:
30
A) 4
B) 5
C) 10
D) 6

20. WHICH OF THE FOLLOWING LINES HAS THE SHORTEST WAVELENGTH?

A) LYMAN-ALPHA
B) BALMER-ALPHA
C) PASCHEN-ALPHA
D) PFUND-ALPHA

21. IN BRACKETT SERIES, THE ELECTRON FALLS TO:

A) N=2
B) N=3
C) N=4
D) N=5

22. IF AN ELECTRON JUMPS FROM TO , THEN NUMBER OF EMITTED

PHOTONS IS:
31
A) 1
B) 5
C) 10
D) 15

23. THE ORBITAL ANGULAR MOMENTUM OF ELECTRON IN NTH ORBIT IS:

A)
B)
C)
D)

24. THE LINE SPECTRUM IS DUE TO:

A) VIBRATION OF ATOMS
B) ROTATION OF MOLECULES
C) TRANSITION OF ELECTRONS
D) NUCLEAR TRANSITIONS

25. WHICH OF THE FOLLOWING IS NOT PART OF HYDROGEN EMISSION

SPECTRUM?
32
A) LYMAN
B) BALMER
C) PASCHEN
D) X-RAY SERIES

26. THE ENERGY REQUIRED TO REMOVE AN ELECTRON FROM N=2 ORBIT

IS:
A) 13.6 EV
B) 3.4 EV
C) 1.5 EV
D) 6.8 EV

27. THE RYDBERG FORMULA IS VALID FOR:

A) ONE-ELECTRON SYSTEMS
B) ALL ATOMS
C) ONLY MOLECULES
D) ONLY METALS

28. IN BOHR’S MODEL, CENTRIPETAL FORCE IS PROVIDED BY:

33
A) GRAVITATIONAL FORCE
B) MAGNETIC FORCE
C) ELECTRIC FORCE
D) WEAK FORCE

29. WHICH SERIES LIES COMPLETELY IN INFRARED?

A) LYMAN
B) BALMER
C) PASCHEN
D) NONE

30. IN HYDROGEN SPECTRUM, SERIES WITH LONGEST WAVELENGTH

PHOTON EMITTED:
A) LYMAN
B) BALMER
C) PASCHEN
D) PFUND

34
31. WHICH OF THE FOLLOWING SERIES HAS HIGHEST ENERGY PHOTONS?
A) LYMAN
B) BALMER
C) PASCHEN
D) BRACKETT

32. NUMBER OF PHOTONS EMITTED WHEN ELECTRON FALLS FROM N=6 TO

N=2:
A) 3
B) 6
C) 10
D) 5

33. WHICH SPECTRAL LINE HAS MINIMUM FREQUENCY?

A) LYMAN-ALPHA
B) BALMER-ALPHA
C) PASCHEN-ALPHA
D) PFUND-ALPHA

35
34. WHAT IS THE RELATION BETWEEN RADIUS AND PRINCIPAL QUANTUM
NUMBER?
A) DIRECT
B) INVERSE
C) SQUARE
D) CUBE

35. THE FIRST LINE OF BRACKETT SERIES IS DUE TO TRANSITION:

A) 5→4
B) 4→3
C) 6→4
D) 5→3

36. WHICH TRANSITION PRODUCES PHOTON OF LOWEST ENERGY?

A) 3→2
B) 4→3
C) 5→4
D) 2→1

36
37. WHEN ELECTRON JUMPS FROM N=∞ TO N=1, IT IS:
A) IONIZATION
B) RECOMBINATION
C) GROUND STATE
D) EXCITATION

38. THE WAVELENGTH OF A PHOTON EMITTED IN LYMAN SERIES IS

SHORTER THAN THAT OF:
A) BALMER
B) PASCHEN
C) BRACKETT
D) ALL

39. EMISSION SPECTRUM OF HYDROGEN ATOM GIVES INFORMATION

ABOUT:
A) NUCLEUS
B) ELECTRONS
C) PROTONS
D) NEUTRONS
37
40. THE ELECTRON IN NTH ORBIT HAS ENERGY E. THEN THE ENERGY
REQUIRED TO FREE IT IS:
A) E
B) -E
C) 2E
D)

41. IN BOHR’S MODEL, VELOCITY OF ELECTRON IS PROPORTIONAL TO:

A)
B)
C)
D)

42. WHAT IS THE ANGULAR MOMENTUM OF ELECTRON IN FIRST ORBIT?

A)
B)
C)
D)
38
43. BOHR’S THEORY IS UNABLE TO EXPLAIN:
A) HYDROGEN SPECTRUM
B) ZEEMAN EFFECT
C) RYDBERG FORMULA
D) BALMER SERIES

44. PASCHEN SERIES LIES IN:

A) UV
B) VISIBLE
C) IR
D) MICROWAVE

45. IF THE RADIUS OF FIRST ORBIT IS R, RADIUS OF THIRD ORBIT IS:

A) 3R
B) 9R
C) R/3
D) R/9

39
46. MAXIMUM SPECTRAL LINES POSSIBLE FOR TRANSITION FROM N=5:
A) 5
B) 10
C) 15
D) 6

47. THE VALUE OF RYDBERG CONSTANT DEPENDS ON:

A) MASS OF NUCLEUS
B) CHARGE OF NUCLEUS
C) BOTH
D) NONE

48. WHICH OF THE FOLLOWING DOES NOT BELONG TO INFRARED

REGION?
A) PASCHEN
B) BRACKETT
C) LYMAN
D) PFUND

40
49. THE SPECTRAL LINES ARE DUE TO:
A) TRANSITIONS OF NUCLEI
B) TRANSITIONS OF ELECTRONS
C) VIBRATIONS OF ATOMS
D) MOTION OF NEUTRONS

50. IF TRANSITION IS FROM N=5 TO N=3, EMITTED RADIATION BELONGS

TO:
A) UV
B) VISIBLE
C) IR
D) MICROWAVE

51. ENERGY EMITTED IN LYMAN SERIES IS:

A) LESS
B) MORE
C) SAME AS BALMER
D) ZERO

41
52. WHICH PARTICLE IS INVOLVED IN HYDROGEN SPECTRA?
A) PROTON
B) NEUTRON
C) ELECTRON
D) NUCLEUS

53. THE WAVELENGTH OF LYMAN-BETA TRANSITION IS CLOSEST TO:

A) 121 NM
B) 102 NM
C) 97 NM
D) 656 NM

54. IN BOHR’S THEORY, FOR HYDROGEN-LIKE SPECIES, THE ENERGY IS

PROPORTIONAL TO:
A) Z
B)
C)
D)

42
55. IONIZATION ENERGY OF HYDROGEN ATOM IS EQUAL TO:
A) ENERGY DIFFERENCE BETWEEN N=2 AND N=1
B) ENERGY DIFFERENCE BETWEEN N=∞ AND N=1
C) ENERGY OF N=1
D) BOTH B AND C

56. THE ELECTRON IN N=3 HAS ENERGY:

A) -13.6 EV
B) -1.51 EV
C) -6.04 EV
D) -1.51 EV

57. BALMER SERIES LIES IN WHICH REGION?

A) IR
B) VISIBLE
C) UV
D) MICROWAVE

58. RADIUS OF HYDROGEN ATOM IN NTH ORBIT VARIES AS:

43
A)
B)
C)
D)

59. IF Z INCREASES IN HYDROGEN-LIKE ATOM, THE SIZE OF ORBIT:

A) INCREASES
B) DECREASES
C) REMAINS SAME
D) UNCERTAIN

60. THE EMISSION SPECTRA OF ATOMS ARE:

A) CONTINUOUS
B) LINE
C) BAND
D) BOTH

ANSWER KEY

44
1) D
2) A
3) A
4) B
5) B
6) A
7) C
8) B
9) A
10) A
11) A
12) B
13) C
14) C
15) B
16) A
17) B
18) A
19) C
45
20) A
21) C
22) D
23) A
24) C
25) D
26) B
27) A
28) C
29) C
30) B
31) A
32) D
33) D
34) A
35) C
36) C
37) B
38) D
46
39) B
40) B
41) B
42) A
43) B
44) C
45) B
46) B
47) C
48) C
49) B
50) C
51) B
52) C
53) B
54) B
55) D
56) D
57) B
47
58) B
59) B
60) B

48