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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
Max plank founded a mathematical model resulting in an equation that describes the shape of observed black body radiation curves exactly, in
Question # 2
An electron is accelerated through a potential difference of 50v. its de-Brogile wavelength is
Question # 3
The special theory of relativity is based on:
Question # 4
If a material object moves with the speed of light 'C' its mass becomes
Question # 5
According to the electromagnetic wave theory of light, increasing the intensity of incident light should increase the
Question # 6
When a position comes close to an electron they annihilate into
Question # 7
In photoelectric effect the energy of ejected electrons depend on
Question # 8
According to the Max plank, energy is redialed or absorbed in
Question # 9
The photon of radio-waves has energy of about
Question # 10
The energy of the 4th orbit in hydrogen atom is
Question # 11
The concept of direction and position are purely
Question # 12
An intertial frame of reference is a frame of reference which is
Question # 13
The positron was discovered by:
Question # 14
The unit of work function is:
Question # 15
Position and momentum of a particle cannot both be measured simultaneously with perfect accuracy. This is the statement of
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ECAT Physics Chapter 19 Important MCQ's
| Sr.# | Question | Answer |
|---|---|---|
| 1 | If a body reaches a speed equal to the speed of light, then its mass will became |
A. zero
B. very small
C. infinity
D. none of these
|
| 2 | Wien's constant is measured in: |
A. Metre per kelviin
B. Metre kelvin
C. Kelvin per meter
D. Joules
|
| 3 | 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 |
A. 2.9 s
B. 3.0 s
C. 6.6 s
D. 9.6 s
|
| 4 | The value of the Stephen's constant for black body radiations is given by |
A. 5.6 x 108Wm-2K-4
B. 5.67 x 10-8Wm-2K-4
C. 2.9 x 10-3mK
D. 2.9 x 103mK
|
| 5 | The inside cavity of the black body is |
A. painted white
B. painted silver
C. blackened with soot
D. painted red
|
| 6 | Position was discovered by Carl Anderson in |
A. 1920
B. 1925
C. 1928
D. 1932
|
| 7 | Wave nature of particle was proposed by |
A. Einstein
B. Plank
C. De-Brogile
D. Max well
|
| 8 | The unit of work function is: |
A. Joule
B. Electron volt
C. That of threshold frequency
D. Both (A) and (B)
|
| 9 | 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
|
| 10 | The nature of radiations emitted by a hot body depends upon its: |
A. Metarial
B. Temperature
C. colour
D. Volume
|
Test Questions
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