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 energy of a photon is represented by	A. h/c² B. h/T C. hc² D. hf/c²
2	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
3	When a platinum wire is heated, it appears yellow at	A. 1600°C B. 900°C C. 1100°C D. 1300°C
4	Electromagnetic radiation or photons interact with matter in	A. two distinct ways B. three distinct ways C. four distinct ways D. five distinct ways
5	Wien's constant is measured in:	A. Metre per kelviin B. Metre kelvin C. Kelvin per meter D. Joules
6	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
7	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
8	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
9	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)
10	A photon is considered to have	A. Momentum B. Energy C. Wavelength D. All of the above

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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

The concept of direction and position are purely

Electromagnetic -radiation means:

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:

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

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

Absolute motion cannot be detected

When a position comes close to an electron they annihilate into

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

Electromagnetic radiation or photons interact with matter in

Victor de-Brogile received the Nobel prize in physics in

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

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

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

Compton was awarded Nobel prize in physics in

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

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

The energy of the 4th orbit in hydrogen atom is

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

Max Planck received the Nobel Prize for his discovery of energy quants in:

The special theory of relativity is based on:

Position was discovered by Carl Anderson in

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

de-Broglies hypthesis was experimentally verified by

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

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

According to the special theory of relativity, a moving clock

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

Which of the following phenomenon proves the particle nature of light

Wave nature of particle was proposed by

An inertial frame is that frame in which

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