12th Class PHYSICS Chapter No.9 ATOMIC SPECTRA Test No.2

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Chapter No. 09  [Test No.2]
2nd Year
Multiple Choice Questions


Book Name :  PHYSICS
Chapter No. 09 (Test No.2)
Chapter Name : ATOMIC SPECTRA 
Total MCQ from Text Book :  95
Book Version  :

Published By : Punjab Text Book Board Lahore
Approved By : Govt of the Punjab and Federal Ministry for Education
Test Type : MCQ’s
Exam conduct By : Inter Boards of Sindh, KPK, Balochistan, AJK, Gilgit Baltistan, Punjab & Federal
Class / Grade  : 12 ( F.Sc. Intermediate)
Total Marks : 95
Total Time :   95 minutes




1 / 95

Photon emitted in inner shell transition are:

2 / 95

Emission of photon of energy hf = E2-E1 in any arbitrary direction is:

3 / 95

The life time of most excited state atoms is about:

4 / 95

In Laser beam, all the photons:

5 / 95

The radius of first Bohr orbit in hydrogen atom is:

6 / 95

With increasing quantum number the energy difference between in adjacent levels in atoms:

7 / 95

X-Rays are maximum absorbed by:

8 / 95

K? -Rays are produced due to tranistion of electrons from:

9 / 95

Laser is the acronym of:

10 / 95

Which of the following is the ratio of K.E. to the P.E of the electron in any Bohr orbit of hydrogen atom?

11 / 95

Helium and neon have nearly identical:

12 / 95

The common door bell requires a voltage of about:

13 / 95

In electronic transition , atom cannot emit:

14 / 95

Helium-neon laser, discharge tube contains helium:

15 / 95

If electron in hydrogen atom jumps from third orbit to second orbit the emitted radiation has wavelength (R is Rydberg's constant):

16 / 95

The excited states in which the life time of an electron is of the order of 10-3 sec are called:

17 / 95

The incident photon is absorbed by an atom in the ground state (E1) thereby leaving the atom in the excited state (E2) is called:

18 / 95

Laser can be made by creating:

19 / 95

The dimensions of Planck's Constant is same as that of:

20 / 95

If V1 is the speed of electron in first orbit of hydrogen atom then velocity of the electron in 4th orbit will be Rydberg constant R and velocity of light C?

21 / 95

Meta stable state is:

22 / 95

The maximum uncertainity in the measurement of positron of an electron inside the nucleus is of the order of:

23 / 95

Which of the following is the energy required (in ev)for ionizing an excited hydrogen atom?

24 / 95

The life time of meta stable is:

25 / 95

In Helium-neon laser, laser light generated has the colour:

26 / 95

For pair production, minimum energy of photon must be:

27 / 95

The radius of 10th orbit in hydrogen atom is:

28 / 95

In X-Rays tube the accelerating potential appllied at the anode is V0. Which of the following will be the minimum wavelength of the emitted x-rays?

29 / 95

In Helium-neon laser, generated red light laser has the wavelength:

30 / 95

Helium-neon laser, discharge tube contains neon:

31 / 95

Laser beam can be used to generate three dimensional images of objects in a process called:

32 / 95

Which of the following series of hydrogen spectrum lies in ultra violet region

33 / 95

Balmer Series lies in:

34 / 95

Which is not characteristic of Laser:

35 / 95

The value of radius of 1st Bohr's orbit:

36 / 95

Electrons of mass m and charge e are accelerated through a potential difference V and strike the target of ray tube. Which of the following is the maximum speed of these electrons?

37 / 95

Production of X-Rays can be regarded as the inverse of:

38 / 95

For which of the following transition infrared radiation will be obtained:

39 / 95

In three phase voltage across any two lines is a:

40 / 95

If V is accelerating voltage then which of the following will be the maximum frequency of emitted X-Rays form X-Rays tube?

41 / 95

In hydrogen atom electron jumps from the first orbit to second orbit, its radius

42 / 95

Hydrogen atom does not emit X-Rays because

43 / 95

An excited atom can reside in a meta stable state for:

44 / 95

In an X-Ray tube, the intensity of emitted X-Rays beam is increased by:

45 / 95

The following gas was identified in the sun using spectoscopy:

46 / 95

Production of X-Rays can be regarded as the inverse of:

47 / 95

If electron jumps from second orbit to first orbit in hydrogen atom it emots photon of:

48 / 95

Laser is a beam of light, which is:

49 / 95

Production of X-Rays is the reverse process of:

50 / 95

In helium-Neon laser, discharge tube is filled with Neon gas:

51 / 95

Hydrogen atom spectrum does not lie in:

52 / 95

The radius of hydrogen atom is about:

53 / 95

Atom can reside in metastable state for:

54 / 95

The intensity of X-Rays from a Coolidge tube is plotted against wavelength ? as shown in the figure. The minimum wavelength found is ?c and the wavelength of the K? line is ?k As The accelerating voltage is increased:

55 / 95

The shortest wavelength of X-Rays emitted from X-Rays tube depends on the:

56 / 95

Gases begin to conduct electricity at low pressure because:

57 / 95

An electron can never by found:

58 / 95

The size of the nucleus of an atom (i.e. diameter of the nucleus) is the order of:

59 / 95

Which of the following is the energy required to remove an electron from the second orbit of hydrogen atom? (ionization potential of H. atom =13.6v)

60 / 95

Atom is nearly:

61 / 95

Which of the following is the frequency of the series limit of Balmer series of hydrogen atom in terms of Rydberg constant R and velocity of Light C?

62 / 95

The maximum number of electrons in the Bohr orbit can be

63 / 95

When an electron in an atom goes from a lower to a higher orbit

64 / 95

Laser principle are of _____________ kinds

65 / 95

In a electronic transition atom cannot emit:

66 / 95

A potential difference of 42000 V is used in an X-Rays tube to acclerate electrons. Which of the following is the maximum frequency of the emitted x-rays?

67 / 95

The meta stable state of Helium is nearly at:

68 / 95

Helium-neon laser discharge tube contains neon:

69 / 95

The meta stable state of neon is nearly at:

70 / 95

In Helium-neon laser, red laser light has energy:

71 / 95

In discharge tube, electricity is conducted by:

72 / 95

Which of the following is the value of principle quantum number of an ionized atom

73 / 95

Balmer Series lies in:

74 / 95

The relation of paschen series is given as:

75 / 95

Accroding to uncertainity principle, for hydrogen atom of radius 5 x 10 -11 m, the speed of electron is:

76 / 95

Which of the following is the ratio of the energies of hydrogen atom in its first to second exceited state?

77 / 95

Laser can only be produced if an atom is in its:

78 / 95

Balmer series lies in:

79 / 95

Life of meta stable of most atoms is about:

80 / 95

The equation of Rydberg constant is given by:

81 / 95

The difference between soft and hard x-rays is of:

82 / 95

Laser has use in:

83 / 95

The value of Rydberg's Constant is:

84 / 95

Which of the following is the K.E of electron that is is accelerated through a potential of 100v

85 / 95

Life time of excited states (meta stable) is:

86 / 95

When electron in hydrogen atoms jumps from the second orbit to the first orbit, the wavelength of the emitted radiation is ? which of the following will be the wavelength of emitted radiation when electron jump from third to first orbit?

87 / 95

The most common type of lasers used in physics laboratries are:

88 / 95

When electron jumps from fourth orbit to the second orbit, one gets the:

89 / 95

The speed of electron in the nth orbit is given as:

90 / 95

Which of the following is the relation between energy (E) and momentum (P) of a photon?

91 / 95

Production of X-Rays is the reverse process of:

92 / 95

Which of the following is the dimensional formula of Rydberg's constant

93 / 95

Population inversion is sustained in the neon gas relative to an energy level of:

94 / 95

Laser emitted by laser device has:

95 / 95

The ratio of minimum to maximum wavelength in Balmer's series is:

Your score is

The average score is 36%


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