12th Class PHYSICS MCQs CHAPTER NO.8 DAWN OF MODERN PHYSICS Test No.1

Physics MCQs 2nd Year Chapter No.8 DAWN OF MODERN PHYSICS Test No.1, FSc, Grade 12, Second Year Multiple Choice Questions, Medical College ( MDCAT ) , ECAT & University Admission Entry Test Exams Online Preparation, Chapter Wise Questions Answers Quiz Notes in Pdf Download, All Old Board Papers included, All Queries reply within 24 Hours. Click here to Contact us for any Query/Question regarding Exams.

PHYSICS 
Chapter Name : DAWN OF MODERN PHYSICS
Chapter No. 8  [Test No.1]
2nd Year
Multiple Choice Questions
 








Book Name :  PHYSICS
Chapter No. 8 (Test No.1)
Chapter Name : DAWN OF MODERN PHYSICS 
Total MCQ from Text Book :  122
Book Version  :
2022

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 : 122
Total Time :   122 minutes
153

GRADE 12 - PHYSICS CHAPTER NO.8 DAWN OF MODERN PHYSICS Test No.1

GRADE 12 - PHYSICS CHAPTER NO.8 DAWN OF MODERN PHYSICS Test No.1

1 / 122

If an object moves with a velocity of light, then the apparent length of the object along the direction of motion becomes

2 / 122

In an expression for time dilation, the quantity √1-v2/c2is always

3 / 122

When a platinum wire is heated, at 1600°ree;C it becomes

4 / 122

The emission of electorns from a metal surface when exposed to light of suitable frequency is called

5 / 122

An human eye can detect the electormegnetic radiations of the type

6 / 122

In photoelectric effect, if intensity of incident radiation is increased, then there is increase in

7 / 122

The mass m of a body moving at 0.8 C becomes

8 / 122

For an electron or positron, the rest-mass energy is equal to

9 / 122

The theory of relativity which deals with non-inertial frame of reference is called

10 / 122

A black body is that which aborbs

11 / 122

According to special theory of relativity, all laws of physics are same in all

12 / 122

According to special theory of relativity, time is

13 / 122

The phenomenon which proves Einstein's relation (E = mc2) is

14 / 122

The rest mass of a photon is

15 / 122

When the temprature of the body is increased, the radiation becomes richer in

16 / 122

If speed of light were infinity, then moving mass m becomes

17 / 122

The discrete nature of radiation was introduced by

18 / 122

In a photocell, sodium and potassium emit electrons for

19 / 122

A device based on photoelectric effect is called

20 / 122

The minimum energy required by a photon to create a electron-positron pair is

21 / 122

The length contraction happens only

22 / 122

Absolute motion of a body

23 / 122

The value of Stefen's constant is

24 / 122

The classical physics is based upon the laws of

25 / 122

The energy of a photon is given by

26 / 122

A beam of red light and a beam of blue light have exactly the same energy. Which beam contains the greater number of photons?

27 / 122

The velocity at which the relativistic length of a body reduces to half of its original length is

28 / 122

A particle with rest mass 'm°ree;' and relativistic mass 'm' has kinetic energy equal to

29 / 122

A coordinate system relative to which measurement are taken is known as

30 / 122

Assuming you radiate as does a black body at a temperature about 17°ree;C, the wavelength of the emitted radiation is

31 / 122

A.H. Compton studied the X-rays by loosely bound electrons from a graphite target in

32 / 122

If we are strictly speaking, then earth is

33 / 122

The process in which energy is converted into meter is called

34 / 122

According to Max Plank, energy is released or absorbed in discrete packets called

35 / 122

The branch of physics which deals with the behaviour of microscopic particles moving with speed of light is called

36 / 122

An intertial frame of reference is that for which

37 / 122

The photoelectric effect can be explained on the basis of

38 / 122

The earth's orbital speed is only

39 / 122

When a very high energy photon interact with a matter, then the following phenomenon taken place

40 / 122

The special theory of relativity is based

41 / 122

A non-inertial frame of reference is that which

42 / 122

Absorption power of perfect black body is

43 / 122

The pair production equation can be written as

44 / 122

In annihilation of matter, positron and electron pair disappears into two

45 / 122

The momentum of a photon frequency f is

46 / 122

In a photocell, certainmetals emit electrons for

47 / 122

A frameof reference in which law of inertia is valid is known as

48 / 122

If the temperature of a black body is doubled, the total radiation from the body becomes

49 / 122

Due to the relative motion of observer and frame of reference, time

50 / 122

In photoelectric effect, light exhibits

51 / 122

The photoelectric effect can be explained by

52 / 122

A positron is a antiparticle of

53 / 122

The part of theory of relativity which deals with inertial or non-accelerating frames of reference is known as

54 / 122

The angle of scattering for which the Compton shift is maximum is

55 / 122

Black body energy distribution curves are the graphs between

56 / 122

Wien's theory explains energy distributon in black body for

57 / 122

Pair production confirms the

58 / 122

When a platinum wire is heated, it appears cherry red at about

59 / 122

Pair production can take place by using

60 / 122

For Pair production minimum energy of photon must be

61 / 122

In the process of annihilation of matter, the two photons produced move in opposite directino to conserve

62 / 122

A high temperature, a body generally emits radiations of

63 / 122

The speed of light in free space is

64 / 122

The pair production and annihilation of matter are

65 / 122

The nature of radiation emitted by a body depends upon

66 / 122

The special theory of relativity is applicable to the objects moving with

67 / 122

The number of photoelectrons emitted (or photoelectric current) is directly proportional to the

68 / 122

When a platinum wire is heated, it appears white at about

69 / 122

In the wien's displacement law i.e. λm x T = constant, the value of constant is

70 / 122

The momentum of a photon is

71 / 122

The numerical value of Compton wavelength h/m°ree;c is equal to

72 / 122

A frame of reference which remains at rest or moves with uniform velocity is called

73 / 122

There is a certain frequency below which no electrons are emitted from the metal surface, this frequency is known as:

74 / 122

The mass of an object will be doulbed at speed

75 / 122

At what angle, the Compton shift '&inc;λ' equals the Compton wavelength?

76 / 122

A photon is considered to have

77 / 122

Black bodies are formed of

78 / 122

The value of Plank's constant h is given by

79 / 122

All motions are

80 / 122

Einstein got the Nobel Prize in physics for his explanation of photoelectric effect in

81 / 122

The maximum energy of the photoelectrons can be determined by making the

82 / 122

The Einstein-energy mass relation can be expressed as

83 / 122

In Compton shift, the factor h/m°ree;c is known as

84 / 122

Photocell is a device which converts

85 / 122

The theory of relativity was proposed by

86 / 122

In a photcell, cesium coated oxidized silver emits electrons for

87 / 122

Positron was discovered by Carl Anderson in

88 / 122

Special theory of relativity was given in

89 / 122

Photoelectric effect was discovered by

90 / 122

A particle and its antiparticle, together at one place

91 / 122

Max Plank suggested that energy is released or absorbed in discrete packets in

92 / 122

Photo electric effect is the converse process of

93 / 122

Compton effect makes use of law of conservation of

94 / 122

The dimensions of Plank's constant h are same as that of

95 / 122

The name of photon for a quantum of light energy was first introduced by

96 / 122

The length of an object or distance between two points measured by an observer who is relatively at rest is called

97 / 122

Which photon, red, green, or blue carries the most energy?

98 / 122

The speed of photon as compared with the speed of light is always

99 / 122

In photoelectric effect, emitted electrons are called

100 / 122

Phenomena such as black body radiation , photoelectric effect, the emission of sharp spectral lines by atoms in a gas discharge tube were explained by

101 / 122

The stopping potential (V°ree;) in photoelectric effect depends on the

102 / 122

Energy of asingle quanta of elctromagnetic radiation is given the name

103 / 122

Radiations are always emitted or absorbed in the form of packets of energy. This is the statement of

104 / 122

When a platinum wire is heated, it appears orange at about

105 / 122

If the speed of light becomes infinite, then the mass of electron moving with velocity 3 x 108 m/s becomes [m0 it the rest mass of electron]

106 / 122

he photoelectric effect was explained by

107 / 122

Einstein s photo electric equation is given by

108 / 122

The maximum energy of the photoelectrons is given by the equation

109 / 122

0.1 kg mass will be equivalent to the energy

110 / 122

The process of pair production takes place if the energy of photon is at least

111 / 122

When the K.E.max of photoelectron is zero, the frequency of incident photon is______that of threshold frequency

112 / 122

In Compton effect, it was considered that X-rays consist of

113 / 122

The anti matter theory was proposed by

114 / 122

In Compton effect, the wavelength of the scattered photon as compard to the wavelength of incident X-rays is

115 / 122

At high temperature, the proprtion of shorter wavelength radiation

116 / 122

Modern physics mainly based upon

117 / 122

The relativistic change in mass, length and time in daily life are not observed because

118 / 122

Which of the following radiations has photons of maximum energy

119 / 122

If a material object moves with speed of light, its mass becomes

120 / 122

The maximum kinetic energy of emitted photoelectrons depends upon

121 / 122

An expression for Compton shift &inc;&lambda for angle θ is given as

122 / 122

The rest mass energy of an electron is

Your score is

The average score is 38%

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