ECAT Pre General Science Chapter 19 online mcq test with answers for Physics chapter 19 (Dawn of Modern Physics)

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ECAT Physics Chapter 19 Important MCQ's

Sr.#	Question	Answer
1	Victor de-Brogile received the Nobel prize in physics in	A. 1925 B. 1929 C. 1932 D. 1935
2	The Stephen-Boltzmann law for the black body radiation is given by	A. E = T² B. E = -T² C. E = T⁴ D. E = -T⁴
3	When a platinum wire is heated, it appears dull red at about	A. 500°C B. 900°C C. 1100°C D. 1300°C
4	According to the Max plank, energy is redialed or absorbed in	A. discrete packets B. continuous waves C. either of them D. none of these
5	A high temperature, the proportion of shorter wavelengths radiation, emitted by the body	A. decreases B. first increases then decreases C. increases D. any one of them
6	Wave nature of particle was proposed by	A. Einstein B. Plank C. De-Brogile D. Max well
7	In photoelectric effect the energy of ejected electrons depend on	A. The frequency B. The intensity C. Both frequency and intensity D. None of these
8	de-Broglies hypthesis was experimentally verified by	A. Maxwell B. Compton C. Einstein D. Davison and Germer
9	The way through which electromagnetic radiations or photons interact with matter depends upon their:	A. Wavelength B. Frequency C. Energy D. Temperature
10	Compton was awarded Nobel prize in physics in	A. 1921 B. 1923 C. 1925 D. 1927

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ECAT Pre General Science Physics Chapter 19 MCQ Test With Answer

MCQ's Test For ECAT Pre General Science Physics Chapter 19 Dawn of Modern Physics

ECAT Pre General Science Physics Chapter 19 Dawn of Modern Physics

The analysis of the distribution of wavelengths of the radiation emitted from a hot body set the foundation of new mechanics, known as

There is certain frequency below which no electrons are emitted from the metal surface, this frequency is known as

The general theory of relativity treats problems involving

As the light shines on the metal surface, the electrons are ejected

With the help of 50 K v electron microscope, a resolution of

According to the special theory of relativity, a moving clock

Davision and Germer performed experiment to verify

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:

When platinum wire is heated, then at the temperature of 500 oC, it becomes:

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

In photoelectric effect the energy of ejected electrons depend on

The emission of electrons from a metal surface when exposed to light of suitable frequency is called the

When a high energy photon interact with a metal, which of the following effect is most likely to be taken place

The concept of direction is purely:

In process of annihilation of matter, the two photons produced move in opposite direction to converse

The threshold frequency of sodium is 6 x 106MHz. The cut-off wavelength for this metal will be

The energy of a photon is represented by

Compton shift refers to:

The energy of photon 'E' is proported to

When a platinum wire is heated, it appears white at

The value of the plank's constant 'h' is given by

According to Einstein, with the great increase in the speed of the body, the relativistic mass of the body

Due to relative motion of observer and the frame of reference of events, time always:

When the atomic particle are moving with velocities approaching that of light:

Compton studied the scattering of x-rays by loosely bound electrons from:

If the radius of first orbit of hydrogen atom is 0.53° A the radius of second orbit will be

In the compton's effect, it is found that the wavelength of incident x-rays is

There is no way to detect:

Victor de-Brogile received the Nobel prize in physics in

When low energy photon interact with a metal,which of the following effect is likely to be taken place

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ECAT Physics Chapter 19 Important MCQ's

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When platinum wire is heated, then at the temperature of 500 ^oC, it becomes:

The threshold frequency of sodium is 6 x 10⁶MHz. The cut-off wavelength for this metal will be