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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
According to the special theory of relativity
Question # 2
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 # 3
Pair production is the phenomenon in which
Question # 4
Newton's law of motion do not hold in
Question # 5
Max Planck received the Nobel Prize for his discovery of energy quants in:
Question # 6
The idea of quantization of energy was proposed by:
Question # 7
Photoelectric effect takes place with a photon of:
Question # 8
The existence of position was predicted by Dirace in
Question # 9
The analysis of the distribution of wavelengths of the radiation emitted from a hot body set the foundation of new mechanics, known as
Question # 10
Max plank founded a mathematical model resulting in an equation that describes the shape of observed black body radiation curves exactly, in
Question # 11
Compton studied the scattering of x-rays by loosely bound electrons from:
Question # 12
A non-inertial frame of reference is one, in which
Question # 13
When the atomic particle are moving with velocities approaching that of light:
Question # 14
When a platinum wire is heated, it appears dull red at about
Question # 15
The emission of electrons from a metal surface when exposed to light of suitable frequency is called the
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ECAT Physics Chapter 19 Important MCQ's
| Sr.# | Question | Answer |
|---|---|---|
| 1 | Photocell is a device which converts |
A. chemical energy into electrical energy
B. electrical energy into light energy
C. heat energy into electrical energy
D. light energy into electrical energy
|
| 2 | G.P. Thomson observer experimentally that electrons and neutrons possess |
A. particle-like properties
B. wave-like properties
C. neither particle nor wave like properties
D. none of these
|
| 3 | the dilation of time applies to the timing processes which are: |
A. Physical
B. Chemical
C. Biological
D. All of these
|
| 4 | The energy of photon 'E' is proported to |
A. The magnetic field H
B. The electric field E
C. Both the electric and magnetic field H and E
D. Frequency
|
| 5 | 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)
|
| 6 | A photon is considered to have |
A. Momentum
B. Energy
C. Wavelength
D. All of the above
|
| 7 | 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
|
| 8 | 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
|
| 9 | When a platinum wire is heated, it appears orange red at |
A. 500°C
B. 900°C
C. 1100°C
D. 1300°C
|
| 10 | The length contraction happens only |
A. Opposite to the direction of motion
B. along the direction of motion
C. perpendicular to the direction of motion
D. In any direction
|
Test Questions
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hasnain
30 May 2018no