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ECAT Pre General Science Physics Chapter 19 Dawn of Modern Physics
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Total Questions30
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Time Allowed30
ECAT Pre General Science Physics Chapter 19 Dawn of Modern Physics
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Question # 1
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 # 2
According to Einstein, with the great increase in the speed of the body, the relativistic mass of the body
Question # 3
Converse of pair production is known as
Question # 4
The unit of work function is:
Question # 5
When platinum wire is heated, then at the temperature of 500 oC, it becomes:
Question # 6
As compared to the distance measured by an observer on Earth, the distance from Earth to a star measured by an observer in a moving spaceship would seem:
Question # 7
If a material object moves with the speed of light 'C' its mass becomes
Question # 8
At the temperature, a body emits radiation which is principally
Question # 9
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 # 10
There is certain frequency below which no electrons are emitted from the metal surface, this frequency is known as
Question # 11
The special theory of relatively treats the problems involving:
Question # 12
The concept of direction is purely:
Question # 13
According to the electromagnetic wave theory of light, increasing the intensity of incident light should increase the
Question # 14
de-Broglies hypthesis was experimentally verified by
Question # 15
According to Einstein, with the great increase in the speed of the body the relativistic length of the body
Question # 16
A high temperature, the proportion of shorter wavelengths radiation, emitted by the body
Question # 17
When a position comes close to an electron they annihilate into
Question # 18
Albert Einstein got the Nobel prize in physics for his explanation of photoelectric effect in
Question # 19
Position was discovered by Carl Anderson in
Question # 20
When monochromatic light is allowed to fall on cathode, it begins to emit electrons, these electrons are called
Question # 21
Max plank founded a mathematical model resulting in an equation that describes the shape of observed black body radiation curves exactly, in
Question # 22
In photoelectric effect the energy of ejected electrons depend on
Question # 23
The Stephen-Boltzmann law for the black body radiation is given by
Question # 24
Intensity of light determines the:
Question # 25
The general theory of relativity treats problems involving
Question # 26
The nature of radiations emitted by a hot body depends upon its:
Question # 27
According to the Max plank, energy is redialed or absorbed in
Question # 28
According to the special theory of relativity, a moving clock
Question # 29
As the light shines on the metal surface, the electrons are ejected
Question # 30
When a position comes close to an electron they annihilate into photons such that
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