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 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
3	Wien's constant is measured in:	A. Metre per kelviin B. Metre kelvin C. Kelvin per meter D. Joules
4	Due to relative motion of observer and the frame of reference of events, time always:	A. Dilates itself B. Contracts itself C. Stretches itself D. Both (A) and (C)
5	0.1 kg mass will be equivalent to the energy	A. 9 x 10¹⁵J B. 5 x 10⁸J C. 6 x 10¹⁶J D. 9 x 10^-16J
6	The Nobel Prize on the explanation of photoelectric effect was awarded to:	A. Max. Planck B. Maxwell C. Bohr D. Rutherford
7	the dilation of time applies to the timing processes which are:	A. Physical B. Chemical C. Biological D. All of these
8	Max plank received the Nobel Prize in physics for his discovery of energy quanta in	A. 1900 B. 1906 C. 1912 D. 1918
9	Strictly speaking, the earth is:	A. An accelerated frame of reference B. A non-inertial frame of reference C. An inertial frame of reference D. ^{A non-accelerated frame of reference}
10	Current, voltage, resistance measuring circuit is connected with the galvanometer with the help of switch, known as	A. ON switch B. off switch C. function switch D. none of these

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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 stopping voltage for a certain metal is 100 volts, then the work function for the cathode plate is

The nature of radiations emitted by a hot body depends upon its:

The energy of photon 'E' is proported to

The way through which electromagnetic radiations or photons interact with matter depends upon their:

The value of the Stephen's constant for black body radiations is given by

0.1 kg mass will be equivalent to the energy

Which one of the following physical quantities changes with relativistic speed

According to the Max plank, energy is redialed or absorbed in

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

An intertial frame of reference is a frame of reference which is

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

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

Momentum is a parameter associated with

According to the de-Brogile relation, an object of large mass and ordinary speed has

The Stephen-Boltzmann law for the black body radiation is given by

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

Photocell is a device which converts

the symbol to be used in relativity problems denotes:

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

Wien's constant is measured in:

Electromagnetic -radiation means:

Photoelectric effect takes place with a photon of:

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

An electron is accelerated through a potential difference of 50v. its de-Brogile wavelength is

The mass of an object will be doubled at speed

When a platinum wire is heated, it appears orange red at

Max plank founded a mathematical model resulting in an equation that describes the shape of observed black body radiation curves exactly, in

G.P. Thomson observer experimentally that electrons and neutrons possess

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

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

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