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 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	A. 2.9 s B. 3.0 s C. 6.6 s D. 9.6 s
2	The idea of quantization of energy was proposed by:	A. Einstein B. Max.Planck C. Maxwell D. Bohr
3	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
4	In order to produce pair production, a photon must have a energy	A. 0.511 Me v B. 0.256 Me v C. 1.02 Me v D. 0.956 Me v
5	The general theory of relativity treats problems involving	A. inertial frame of references B. accelerating frame of references C. both of these D. none of these
6	Wave nature of particle was proposed by	A. Einstein B. Plank C. De-Brogile D. Max well
7	Compton studied the scattering of x-rays by loosely bound electrons from:	A. NaCl crystal B. Graphite crystal C. Zirconia D. Copper crystal
8	The concept of direction is purely:	A. Absolute B. Relative C. Relative to stars always D. Relative to the sun always
9	In the compton's effect, it is found that the wavelength of incident x-rays is	A. greater than the wavelength of scattered x-rays B. equal to the wavelength of scattered x-rays C. less than the wavelength of scattered x-rays D. any one of these
10	The energy of photon 'E' is proported to	A. The magnetic field H B. The electric field E C. Both the electric and magnetic field H and E D. Frequency

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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

Compton shift refers to:

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

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

According to the special theory of relativity, time is

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

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

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

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

Newton's law of motion do not hold in

Victor de-Brogile received the Nobel prize in physics in

According to the electromagnetic wave theory of light, increasing the intensity of incident light should increase the

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

The ratio of energy E to the corresponding frequency (f) of the radiation (emitted or absorbed) is called:

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

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

Albert Einstein got the Nobel prize in physics for his explanation of photoelectric effect in

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

The special theory of relatively treats the problems involving:

Compton derived an expression to find compton shift by applying to the process, the law of conservation of:

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

In order to produce pair production, a photon must have a energy

The location and speed anywhere on earth can now be determined using relativistic effects by NAVISTAR to an accuracy of

Current, voltage, resistance measuring circuit is connected with the galvanometer with the help of switch, known as

According to the special theory of relativity, a moving clock

Electromagnetic radiation or photons interact with matter in

A high temperature, the proportion of shorter wavelengths radiation, emitted by the body

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

The energy of photon 'E' is proported to

Compton was awarded Nobel prize in physics in

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

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