ECAT Pre General Science Physics Chapter 19 MCQ Test With Answer

MCQ's Test For ECAT Pre General Science Physics Chapter 19 Dawn of Modern Physics

Try The MCQ's Test For ECAT Pre General Science Physics Chapter 19 Dawn of Modern Physics

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ECAT Pre General Science Physics Chapter 19 Dawn of Modern Physics

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Question # 1

A particle of mass 5.0 mg moves with a speed of 8.0 m/s. Its de-Brogile wavelength is

Question # 2

The energy of the 4th orbit in hydrogen atom is

Question # 3

The energy of a photon in a beam of infrared radiation of wavelength 1240 nm is

Question # 4

The whole shape of the black body spectrum for all wavelengths was explained by the formula proposed by

Question # 5

Compton shift refers to:

Question # 6

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

Question # 7

Which one of the following physical quantities changes with relativistic speed

Question # 8

When platinum wire is heated, it appears cherry red at

Question # 9

In the compton's effect, it is found that the wavelength of incident x-rays is

Question # 10

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

Question # 11

The unit of work function is:

Question # 12

When low energy photon interact with a metal,which of the following effect is likely to be taken place

Question # 13

Max plank founded a mathematical model resulting in an equation that describes the shape of observed black body radiation curves exactly, in

Question # 14

When a high energy photon interact with a metal, which of the following effect is most likely to be taken place

Question # 15

Compton was awarded Nobel prize in physics in

Question # 16

Position was discovered by Carl Anderson in

Question # 17

The Nobel Prize on the explanation of photoelectric effect was awarded to:

Question # 18

At the temperature, a body emits radiation which is principally

Question # 19

If the radius of first orbit of hydrogen atom is 0.53° A the radius of second orbit will be

Question # 20

Wave nature of particle was proposed by

Question # 21

According to Einstein, with the great increase in the speed of the body the relativistic length of the body

Question # 22

According to the Max plank, energy is redialed or absorbed in

Question # 23

The location and speed anywhere on earth can now be determined using relativistic effects by NAVISTAR to an accuracy of

Question # 24

In photoelectric effect the energy of ejected electrons depend on

Question # 25

The special theory of relativity is based on the

Question # 26

A bar 1.0 m in length and located along x-axix moves with a speed of 0.75 c with respect to a stationary observer. The length of the bar as measured by the stationary observer is

Question # 27

The value of threshold frequency for different metals is

Question # 28

According to the special theory of relativity, a moving clock

Question # 29

Newton's law of motion do not hold in

Question # 30

Max Planck received the Nobel Prize for his discovery of energy quants in:

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ECAT Physics Chapter 19 Important MCQ's

Sr.# Question Answer
1 The positron was discovered by:
A. In cosmic radiation
B. In 1932
C. By Carl Anderson
D. All above
2 An electron is accelerated through a potential difference of 50v. its de-Brogile wavelength is
A. 1.66 x 10-29m
B. 1.74 x 10-10cm
C. 17.4 x 10-6m
D. 1.74 x 10-10m
3 In order to produce pair production, a photon must have a energy
A. 0.511 Me v
B. 0.256 Me v
C. 1.02 Me v
D. 0.956 Me v
4 A non-inertial frame of reference is one, in which
A. law of inertial is valid
B. all laws of physics are the same in all frames
C. a>0 or a<0
D. a=0
5 When a platinum wire is heated, it appears dull red at about
A. 500°C
B. 900°C
C. 1100°C
D. 1300°C
6 When a platinum wire is heated, it appears orange red at
A. 500°C
B. 900°C
C. 1100°C
D. 1300°C
7 The photon of radio-waves has energy of about
A. 1 Me V
B. 1 Ke v
C. 10-10e v
D. 1010e v
8 The emission of electrons from a metal surface when exposed to light of suitable frequency is called the
A. pair production
B. Compton effect
C. photoelectric effect
D. relativity
9 The concept of direction and position are purely
A. absolute
B. relative
C. absolute or relative
D. none of these
10 There is no way to detect:
A. Absolute uniform motion
B. Accelerated motion
C. State rest
D. State of motion

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