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

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

Question # 2

The mass 'm' of a body moving at 0.8 c (whose rest mass is mo) becomes

Question # 3

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

Question # 4

The year when A.H. compton was awarded Nobel Prize is:

Question # 5

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

Question # 6

The intensity of emitted energy (with wavelength) radiated from a black body at different temperatures was initially measured by:

Question # 7

The energy of a photon is represented by

Question # 8

the dilation of time applies to the timing processes which are:

Question # 9

the symbol to be used in relativity problems denotes:

Question # 10

Compton shift refers to:

Question # 11

The mass of an object will be doubled at speed

Question # 12

Davision and Germer performed experiment to verify

Question # 13

The special theory of relativity is based on:

Question # 14

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

Question # 15

The photon of radio-waves has energy of about

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ECAT Physics Chapter 19 Important MCQ's

Sr.# Question Answer
1 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
2 The Einstein's changes in length, mass and time are not observed in common life because
A. We dont observer then seriously
B. The masses are too large
C. Their speed is too small than the speed of right
D. All of the above
3 Compton studied the scattering of x-rays by loosely bound electrons from:
A. NaCl crystal
B. Graphite crystal
C. Zirconia
D. Copper crystal
4 Max Planck received the Nobel Prize for his discovery of energy quants in:
A. 1718 AD
B. 1918 AH
C. 1818 AD
D. 1918 AD
5 The energy of the 4th orbit in hydrogen atom is
A. 2.5 ev
B. - 3.5 ev
C. -0.85 ev
D. -13.6 ev
6 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
7 A photon is considered to have
A. Momentum
B. Energy
C. Wavelength
D. All of the above
8 The Stephen-Boltzmann law for the black body radiation is given by
A. E = T2
B. E = -T2
C. E = T4
D. E = -T4
9 the symbol to be used in relativity problems denotes:
A. Dilated time
B. Proper time
C. Life time
D. Half time
10 The intensity of emitted energy (with wavelength) radiated from a black body at different temperatures was initially measured by:
A. Lummer
B. Planck
C. Pringsheim
D. Both (A ) and (B)

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