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	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	Newton's law of motion do not hold in	A. an accelerated frame of reference B. an unaccelerated frame of reference C. both of these D. none of these
3	Wave nature of particle was proposed by	A. Einstein B. Plank C. De-Brogile D. Max well
4	Electromagnetic -radiation means:	A. Photons B. protons C. Electrons D. Mesons
5	An electron is accelerated through a potential difference of 50v. its de-Brogile wavelength is	A. 1.66 x 10^-29m B. 1.74 x 10^-10cm C. 17.4 x 10^-6m D. 1.74 x 10^-10m
6	the symbol to be used in relativity problems denotes:	A. Dilated time B. Proper time C. Life time D. Half time
7	Electromagnetic radiation or photons interact with matter in	A. two distinct ways B. three distinct ways C. four distinct ways D. five distinct ways
8	The intensity of emitted energy (with wavelength) radiated from a black body at different temperatures was initially measured by:	A. Lummer B. Planck C. Pringsheim D. Both (A ) and (B)
9	The threshold frequency of sodium is 6 x 10⁶MHz. The cut-off wavelength for this metal will be	A. 500 m B. 500 nm C. 500 km D. 500 cm
10	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)

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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

Which of the following phenomenon proves the particle nature of light

A photon is considered to have

The special theory of relativity is based on:

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:

Newton's law of motion do not hold in

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

Davision and Germer performed experiment to verify

Photoelectrons are emitted when ultraviolet light falls on:

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

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

the dilation of time applies to the timing processes which are:

An inertial frame is that frame in which

Converse of pair production is known as

When a platinum wire is heated, it appears yellow at

Position was discovered by Carl Anderson in

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

When a platinum wire is heated, it appears dull red at about

The energy of photon 'E' is proported to

The concept of direction is purely:

Compton shift refers to:

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

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

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

The existence of position was predicted by Dirace in

If you are moving at relativistic speed between two points that are a fixed distance apart, then the distance between the two points appers

Strictly speaking, the earth is:

The energy of a photon is represented by

According to the special theory of relativity, a moving clock

The mass of an object will be doubled at speed

Momentum is a parameter associated with

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ECAT Physics Chapter 19 Important MCQ's

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