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 speed of a pendulum is measured to be 3.0 s in the inertial reference frame of the pendulum. What is its period measured by an observer moving at a speed of 0.95 c with respect to the pendulum

Question # 2

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

Question # 3

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

Question # 4

Position was discovered by Carl Anderson in

Question # 5

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

Question # 6

According to the special theory of relativity, time is

Question # 7

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

Question # 8

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

Question # 9

Pair production is the phenomenon in which

Question # 10

Photocell is a device which converts

Question # 11

Position and momentum of a particle cannot both be measured simultaneously with perfect accuracy. This is the statement of

Question # 12

According to the special theory of relativity

Question # 13

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

Question # 14

The photon of radio-waves has energy of about

Question # 15

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

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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 Albert Einstein got the Nobel prize in physics for his explanation of photoelectric effect in
A. 1916
B. 1919
C. 1921
D. 1923
3 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
4 When the atomic particle are moving with velocities approaching that of light:
A. Newton's laws become valid
B. Relativistic effects become prominent
C. Botha(A) and (B) are valid
D. Neither (A)nor (B)
5 The positron was discovered by:
A. In cosmic radiation
B. In 1932
C. By Carl Anderson
D. All above
6 Compton studied the scattering of x-rays by loosely bound electrons from:
A. NaCl crystal
B. Graphite crystal
C. Zirconia
D. Copper crystal
7 The Nobel Prize on the explanation of photoelectric effect was awarded to:
A. Max. Planck
B. Maxwell
C. Bohr
D. Rutherford
8 If you are moving at relativistic speed between two points that are a fixed distance apart, then the distance between the two points appers
A. larger
B. shorter
C. equal
D. none of these
9 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)
10 The analysis of the distribution of wavelengths of the radiation emitted from a hot body set the foundation of new mechanics, known as
A. classical mechanics
B. Newtonian mechanics
C. quantum mechanics
D. statistical mechanics

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