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	Max plank received the Nobel Prize in physics for his discovery of energy quanta in	A. 1900 B. 1906 C. 1912 D. 1918
2	If you are moving at relativistic speed between two points that are a fixed distance apart, then the distance between the two points appers	A. larger B. shorter C. equal D. none of these
3	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
4	A particle having mass and charge equal to that of an electron is called:	A. Proton B. Positron C. Pion D. Pi-meson
5	The energy of a photon is represented by	A. h/c² B. h/T C. hc² D. hf/c²
6	The length contraction happens only	A. Opposite to the direction of motion B. along the direction of motion C. perpendicular to the direction of motion D. In any direction
7	The idea of quantization of energy was proposed by:	A. Einstein B. Max.Planck C. Maxwell D. Bohr
8	Max Planck received the Nobel Prize for his discovery of energy quants in:	A. 1718 AD B. 1918 AH C. 1818 AD D. 1918 AD
9	The photon of radio-waves has energy of about	A. 1 Me V B. 1 Ke v C. 10^-10e v D. 10¹⁰e v
10	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

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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

At the temperature, a body emits radiation which is principally

The whole shape of the black body spectrum for all wavelengths was explained by the formula proposed by

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

Photocell is a device which converts

When a platinum wire is heated, it appears yellow at

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

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

Strictly speaking, the earth is:

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

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

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

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

There is no way to detect:

de-Broglies hypthesis was experimentally verified by

0.1 kg mass will be equivalent to the energy

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

Max plank received the Nobel Prize in physics for his discovery of energy quanta in

Electromagnetic -radiation means:

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

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

When a platinum wire is heated, it appears white at

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

Davision and Germer performed experiment to verify

Electromagnetic radiation or photons interact with matter in

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

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

Photoelectrons are emitted when ultraviolet light falls on:

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

There is certain frequency below which no electrons are emitted from the metal surface, this frequency is known as

Victor de-Brogile received the Nobel prize in physics in

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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