ECAT Pre Computer Science Chapter 19 MCQ Test With Answer

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

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

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ECAT Physics Chapter 19 Dawn of Modern Physics

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Question # 1

The existence of position was predicted by Dirace in

Question # 2

Photocell is a device which converts

Question # 3

The mass of an object will be doubled at speed

Question # 4

Position was discovered by Carl Anderson in

Question # 5

The photoelectric effect, the maximum energy of photoelectrons depends on the

Question # 6

the symbol to be used in relativity problems denotes:

Question # 7

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

Question # 8

According to the special theory of relativity

Question # 9

The concept of direction is purely:

Question # 10

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

Question # 11

The way through which electromagnetic radiations or photons interact with matter depends upon their:

Question # 12

The special theory of relativity is based on the

Question # 13

A high temperature, the proportion of shorter wavelengths radiation, emitted by the body

Question # 14

The concept of direction and position are purely

Question # 15

The energy of the 4th orbit in hydrogen atom is

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ECAT Physics Chapter 19 Important MCQ's

Sr.# Question Answer
1 An inertial frame is that frame in which
A. a>0
B. a=0
C. a<0
D. none of these
2 The location and speed anywhere on earth can now be determined using relativistic effects by NAVISTAR to an accuracy of
A. 2 cm/s
B. 20 cm/s
C. 200 cm/s
D. 2000 cm/s
3 The photon of radio-waves has energy of about
A. 1 Me V
B. 1 Ke v
C. 10-10e v
D. 1010e v
4 The stopping voltage for a certain metal is 100 volts, then the work function for the cathode plate is
A. 100 J
B. 1.6 x 10-17J
C. 100 eV
D. 1.6 x 10-17eV
5 The ratio of energy E to the corresponding frequency (f) of the radiation (emitted or absorbed) is called:
A. Wien's constant
B. Stefen's constnat
C. Planck's constant
D. Boltzmann's constant
6 When a position comes close to an electron they annihilate into
A. one photon
B. two photons which travel in the same direction
C. two photons which travels in the opposite direction
D. two photons which travel in any direction
7 Davision and Germer performed experiment to verify
A. de-Brogile hypothesis
B. theory of relativity
C. Newton's law of gravitation
D. Mass-energy relation
8 The Nobel Prize on the explanation of photoelectric effect was awarded to:
A. Max. Planck
B. Maxwell
C. Bohr
D. Rutherford
9 According to Einstein, with the great increase in the speed of the body, the relativistic mass of the body
A. Remains constant
B. Decreases
C. Increases to infinity
D. Reduced to zero
10 When monochromatic light is allowed to fall on cathode, it begins to emit electrons, these electrons are called
A. thermoionic electrons
B. free electrons
C. photoelectrons
D. slow electrons

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