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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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Total Questions15
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Time Allowed20
Physics ECAT Pre Engineering Chapter 19 Dawn of Modern Physics
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Question # 1
the dilation of time applies to the timing processes which are:
Question # 2
When platinum wire is heated, it appears cherry red at
Question # 3
The general theory of relativity treats problems involving
Question # 4
A black body is
Question # 5
The concept of direction is purely:
Question # 6
A high temperature, the proportion of shorter wavelengths radiation, emitted by the body
Question # 7
With the help of 50 K v electron microscope, a resolution of
Question # 8
If a material object moves with the speed of light 'C' its mass becomes
Question # 9
From the theory of relativity, momentum p of the photon is related to energy as
Question # 10
Position was discovered by Carl Anderson in
Question # 11
When a high energy photon interact with a metal, which of the following effect is most likely to be taken place
Question # 12
A particle of mass 5.0 mg moves with a speed of 8.0 m/s. Its de-Brogile wavelength is
Question # 13
The value of the Stephen's constant for black body radiations is given by
Question # 14
An inertial frame is that frame in which
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 | the symbol to be used in relativity problems denotes: |
A. Dilated time
B. Proper time
C. Life time
D. Half time
|
| 2 | 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
|
| 3 | 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
|
| 4 | The idea of quantization of energy was proposed by: |
A. Einstein
B. Max.Planck
C. Maxwell
D. Bohr
|
| 5 | The concept of direction and position are purely |
A. absolute
B. relative
C. absolute or relative
D. none of these
|
| 6 | The emission of electrons from a metal surface when exposed to light of suitable frequency is called the |
A. pair production
B. Compton effect
C. photoelectric effect
D. relativity
|
| 7 | 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
|
| 8 | With the help of 50 K v electron microscope, a resolution of |
A. 0.5 to 1 m to possible
B. 1 m to 10 m is possible
C. 0.5 to 1 nm is possible
D. 1 to 10 nm is possible
|
| 9 | The energy of a photon is represented by |
A. h/c2
B. h/T
C. hc2
D. hf/c2
|
| 10 | If A represents linear momentum and c, the velocity of light, then unit of pc in international system of units is: |
A. Newton
B. Joule
C. Joule-Sec
D. Joule-s-1
|
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