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 stopping voltage for a certain metal is 100 volts, then the work function for the cathode plate is

Question # 2

A non-inertial frame of reference is one, in which

Question # 3

Current, voltage, resistance measuring circuit is connected with the galvanometer with the help of switch, known as

Question # 4

From the theory of relativity, momentum p of the photon is related to energy as

Question # 5

Converse of pair production is known as

Question # 6

The special theory of relativity is based on:

Question # 7

The Stephen-Boltzmann law for the black body radiation is given by

Question # 8

Position was discovered by Carl Anderson in

Question # 9

The concept of direction and position are purely

Question # 10

A black body is

Question # 11

de-Broglies hypthesis was experimentally verified by

Question # 12

Electromagnetic radiation or photons interact with matter in

Question # 13

Wien's constant is measured in:

Question # 14

When a platinum wire is heated, it appears yellow at

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 Which one of the following physical quantities changes with relativistic speed
A. Length
B. Mass
C. Time
D. All of the above
2 Electromagnetic -radiation means:
A. Photons
B. protons
C. Electrons
D. Mesons
3 Practically the quantity v/c is always:
A. less than one
B. Equal to one
C. Greater then one
D. all of these
4 The special theory of relativity is based on the
A. one postulate
B. two postulates
C. three postulates
D. four postulates
5 Wave nature of particle was proposed by
A. Einstein
B. Plank
C. De-Brogile
D. Max well
6 A particle having mass and charge equal to that of an electron is called:
A. Proton
B. Positron
C. Pion
D. Pi-meson
7 The length contraction happens only
A. Opposite to the direction of motion
B. along the direction of motion
C. perpendicular to the direction of motion
D. In any direction
8 The way through which electromagnetic radiations or photons interact with matter depends upon their:
A. Wavelength
B. Frequency
C. Energy
D. Temperature
9 the dilation of time applies to the timing processes which are:
A. Physical
B. Chemical
C. Biological
D. All of these
10 Max plank founded a mathematical model resulting in an equation that describes the shape of observed black body radiation curves exactly, in
A. 1890
B. 1895
C. 1900
D. 1905

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