ECAT Pre Engineering Physics Chapter 19 MCQ Test With Answer

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

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

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Physics ECAT Pre Engineering Chapter 19 Dawn of Modern Physics

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Question # 1

The concept of direction and position are purely

Question # 2

Intensity of light determines the:

Question # 3

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

Question # 4

Photoelectrons are emitted when ultraviolet light falls on:

Question # 5

Wien's constant is measured in:

Question # 6

Absolute motion cannot be detected

Question # 7

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 # 8

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

Question # 9

0.1 kg mass will be equivalent to the energy

Question # 10

The unit of work function is:

Question # 11

According to the electromagnetic wave theory of light, increasing the intensity of incident light should increase the

Question # 12

The energy of the 4th orbit in hydrogen atom is

Question # 13

Pair production is the phenomenon in which

Question # 14

A particle having mass and charge equal to that of an electron is called:

Question # 15

The value of the plank's constant 'h' is given by

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ECAT Physics Chapter 19 Important MCQ's

Sr.# Question Answer
1 Newton's law of motion do not hold in
A. an accelerated frame of reference
B. an unaccelerated frame of reference
C. both of these
D. none of these
2 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)
3 Albert Einstein got the Nobel prize in physics for his explanation of photoelectric effect in
A. 1916
B. 1919
C. 1921
D. 1923
4 Compton was awarded Nobel prize in physics in
A. 1921
B. 1923
C. 1925
D. 1927
5 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
6 Photoelectric effect takes place with a photon of:
A. Very high energy
B. Very low energy
C. Low energy
D. High energy
7 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
8 When platinum wire is heated, then at the temperature of 500 oC, it becomes:
A. Yellow
B. Orange red
C. Dull red
D. White
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 A photon is considered to have
A. Momentum
B. Energy
C. Wavelength
D. All of the above

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