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	According to Einstein, with the great increase in the speed of the body, the relativistic mass of the body	A. Remains constant B. Decreases C. Increases to infinity D. Reduced to zero
2	Wien's constant is measured in:	A. Metre per kelviin B. Metre kelvin C. Kelvin per meter D. Joules
3	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)
4	Compton was awarded Nobel prize in physics in	A. 1921 B. 1923 C. 1925 D. 1927
5	The mass of an object will be doubled at speed	A. 1.6 x 10⁸ms^-1 B. 2.6 X 10⁸ms^-1 C. 2.6 x 10⁷ms^-1 D. 2.6 x 10⁹ms^-1
6	Albert Einstein got the Nobel prize in physics for his explanation of photoelectric effect in	A. 1916 B. 1919 C. 1921 D. 1923
7	Which of the following phenomenon proves the particle nature of light	A. interference B. diffraction C. photoelectric effect D. none of these
8	At the temperature, a body emits radiation which is principally	A. of long wavelengths in the visible region B. of long wavelengths in the invisible infrared region C. of short wavelength in invisible ultraviolet region D. none of these
9	de-Broglies hypthesis was experimentally verified by	A. Maxwell B. Compton C. Einstein D. Davison and Germer
10	A non-inertial frame of reference is one, in which	A. law of inertial is valid B. all laws of physics are the same in all frames C. a>0 or a<0 D. a=0

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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

Due to relative motion of observer and the frame of reference of events, time always:

Which one of the following physical quantities changes with relativistic speed

A bar 1.0 m in length and located along x-axix moves with a speed of 0.75 c with respect to a stationary observer. The length of the bar as measured by the stationary observer is

Electromagnetic radiation or photons interact with matter in

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

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

When a position comes close to an electron they annihilate into

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

The Nobel Prize on the explanation of photoelectric effect was awarded to:

Intensity of light determines the:

Pair production is the phenomenon in which

The unit of work function is:

The concept of direction is purely:

The positron was discovered by:

The mass of an object will be doubled at speed

From the theory of relativity, momentum p of the photon is related to energy as

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

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

The photon of radio-waves has energy of about

Position and momentum of a particle cannot both be measured simultaneously with perfect accuracy. This is the statement of

Victor de-Brogile received the 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

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

Absolute motion cannot be detected

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

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

According to the special theory of relativity, a moving clock

Photocell is a device which converts

At the temperature, a body emits radiation which is principally

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

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