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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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Total Questions15
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Time Allowed20
ECAT Physics Chapter 19 Dawn of Modern Physics
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Question # 1
The intensity of emitted energy (with wavelength) radiated from a black body at different temperatures was initially measured by:
Question # 2
The special theory of relativity is based on the
Question # 3
The stopping voltage for a certain metal is 100 volts, then the work function for the cathode plate is
Question # 4
the symbol to be used in relativity problems denotes:
Question # 5
A black body is
Question # 6
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 # 7
Compton shift refers to:
Question # 8
In the compton's effect, it is found that the wavelength of incident x-rays is
Question # 9
Which of the following phenomenon proves the particle nature of light
Question # 10
When low energy photon interact with a metal,which of the following effect is likely to be taken place
Question # 11
According to the Max plank, energy is redialed or absorbed in
Question # 12
If a material object moves with the speed of light 'C' its mass becomes
Question # 13
The mass of an object will be doubled at speed
Question # 14
The Einstein's changes in length, mass and time are not observed in common life because
Question # 15
Max plank founded a mathematical model resulting in an equation that describes the shape of observed black body radiation curves exactly, in
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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 idea of quantization of energy was proposed by: |
A. Einstein
B. Max.Planck
C. Maxwell
D. Bohr
|
| 3 | When a high energy photon interact with a metal, which of the following effect is most likely to be taken place |
A. pair production
B. photoelectric effect
C. Compton effect
D. None of these
|
| 4 | 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
|
| 5 | The mass 'm' of a body moving at 0.8 c (whose rest mass is mo) becomes |
A. 2 mo
B. 1.67 mo
C. 0.67 mo
D. 2.67 mo
|
| 6 | The whole shape of the black body spectrum for all wavelengths was explained by the formula proposed by |
A. Max plank
B. Newton
C. Einstein
D. J.J. Thomson
|
| 7 | The nature of radiations emitted by a hot body depends upon its: |
A. Metarial
B. Temperature
C. colour
D. Volume
|
| 8 | Wave nature of particle was proposed by |
A. Einstein
B. Plank
C. De-Brogile
D. Max well
|
| 9 | Converse of pair production is known as |
A. Compton effect
B. annihilation of matter
C. photoelectric effect
D. none of these
|
| 10 | At the temperature, a body emits radiation which is principally |
A. of long wavelengths in the visible region
B. of long wavelengths in the invisible infrared region
C. of short wavelength in invisible ultraviolet region
D. none of these
|
Test Questions