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	The whole shape of the black body spectrum for all wavelengths was explained by the formula proposed by	A. Max plank B. Newton C. Einstein D. J.J. Thomson
2	Davision and Germer performed experiment to verify	A. de-Brogile hypothesis B. theory of relativity C. Newton's law of gravitation D. Mass-energy relation
3	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
4	Practically the quantity v/c is always:	A. less than one B. Equal to one C. Greater then one D. all of these
5	Momentum is a parameter associated with	A. wave motion B. particle motion C. neither wave nor particle motion D. none of these
6	Electromagnetic -radiation means:	A. Photons B. protons C. Electrons D. Mesons
7	The analysis of the distribution of wavelengths of the radiation emitted from a hot body set the foundation of new mechanics, known as	A. classical mechanics B. Newtonian mechanics C. quantum mechanics D. statistical mechanics
8	At the temperature, a body emits radiation which is principally	A. of long wavelengths in the visible region B. of long wavelengths in the invisible infrared region C. of short wavelength in invisible ultraviolet region D. none of these
9	The Einstein's changes in length, mass and time are not observed in common life because	A. We dont observer then seriously B. The masses are too large C. Their speed is too small than the speed of right D. All of the above
10	Wien's constant is measured in:	A. Metre per kelviin B. Metre kelvin C. Kelvin per meter D. Joules

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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 mass of an object will be doubled at speed

The concept of direction is purely:

Electromagnetic -radiation means:

Compton shift refers to:

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

Photoelectric effect takes place with a photon of:

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

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

The photon of radio-waves has energy of about

The Einstein's changes in length, mass and time are not observed in common life because

The idea of quantization of energy was proposed by:

Position was discovered by Carl Anderson in

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:

A particle having mass and charge equal to that of an electron is called:

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

The energy of the 4th orbit in hydrogen atom is

The energy of photon 'E' is proported to

The special theory of relativity is based on the

The positron was discovered by:

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

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

A non-inertial frame of reference is one, in which

When a platinum wire is heated, it appears white at

When a position comes close to an electron they annihilate into photons such that

The value of threshold frequency for different metals is

Practically the quantity v/c is always:

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

The general theory of relativity treats problems involving

There is no way to detect:

Which of the following phenomenon proves the particle nature of light

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ECAT Physics Chapter 19 Important MCQ's

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