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	A black body is	A. an ideal absorber B. an ideal radiator C. both of them D. none of them
2	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
3	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
4	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
5	When a position comes close to an electron they annihilate into	A. one photon B. two photons which travel in the same direction C. two photons which travels in the opposite direction D. two photons which travel in any direction
6	The concept of direction and position are purely	A. absolute B. relative C. absolute or relative D. none of these
7	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
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	Absolute motion cannot be detected	A. in its own frame of references B. in a different frame of references C. both in its frame and different frame of references D. none of these
10	G.P. Thomson observer experimentally that electrons and neutrons possess	A. particle-like properties B. wave-like properties C. neither particle nor wave like properties 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

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

Wien's constant is measured in:

Wave nature of particle was proposed by

The mass of an object will be doubled at speed

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

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

According to the special theory of relativity

Compton was awarded Nobel prize in physics in

The special theory of relativity treats problems invoving

A black body is

If A represents linear momentum and c, the velocity of light, then unit of pc in international system of units is:

The idea of quantization of energy was proposed by:

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

Absolute motion cannot be detected

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

The concept of direction and position are purely

The special theory of relativity is based on the

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

When a platinum wire is heated, it appears white at

Pair production is the phenomenon in which

There is no way to detect:

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

The photon of radio-waves has energy of about

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

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

The photoelectric effect, the maximum energy of photoelectrons depends on the

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

Converse of pair production is known as

The length contraction happens only

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

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