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	From the theory of relativity, momentum p of the photon is related to energy as	A. p = hfc B. p = hf/c C. p = f(hc,f) D. p = cf/h
2	The photoelectric effect, the maximum energy of photoelectrons depends on the	A. particular metal surface B. frequency of incident light C. both of them D. none of them
3	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
4	When a platinum wire is heated, it appears orange red at	A. 500°C B. 900°C C. 1100°C D. 1300°C
5	An intertial frame of reference is a frame of reference which is	A. at rest B. moving with uniform velocity C. either at rest or moving with uniform velocity D. none of these
6	Electromagnetic -radiation means:	A. Photons B. protons C. Electrons D. Mesons
7	The ratio of energy E to the corresponding frequency (f) of the radiation (emitted or absorbed) is called:	A. Wien's constant B. Stefen's constnat C. Planck's constant D. Boltzmann's constant
8	Albert Einstein got the Nobel prize in physics for his explanation of photoelectric effect in	A. 1916 B. 1919 C. 1921 D. 1923
9	Wien's constant is measured in:	A. Metre per kelviin B. Metre kelvin C. Kelvin per meter D. Joules
10	A black body is	A. an ideal absorber B. an ideal radiator C. both of them D. none of them

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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

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

When platinum wire is heated, it appears cherry red at

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

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

If a body reaches a speed equal to the speed of light, then its mass will became

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

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

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

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

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

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

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

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

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

Which of the following phenomenon proves the particle nature of light

The energy of photon 'E' is proported to

The special theory of relativity treats problems invoving

The energy of a photon in a beam of infrared radiation of wavelength 1240 nm is

Wave nature of particle was proposed by

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

Practically the quantity v/c is always:

The special theory of relativity is based on:

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

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

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

The value of threshold frequency for different metals is

A particle of mass 5.0 mg moves with a speed of 8.0 m/s. Its de-Brogile wavelength is

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

The idea of quantization of energy was proposed by:

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

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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