ECAT Pre General Science Chapter 19 online mcq test with answers for Physics chapter 19 (Dawn of Modern Physics)

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khadim Hussain 03 - Mar - 2021 10 Min 50 Sec 75/120
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Ziyad Rehman Sheikh 16 - Nov - 2022 07 Min 21 Sec 40/120
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maha 01 - Mar - 2023 04 Min 24 Sec 35/120

ECAT Physics Chapter 19 Important MCQ's

Sr.#	Question	Answer
1	The year when A.H. compton was awarded Nobel Prize is:	A. 1923 B. 1927 C. 1931 D. 1935
2	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
3	The energy of a photon in a beam of infrared radiation of wavelength 1240 nm is	A. 100 ev B. 10⁶e v C. 10³e v D. 1.0 e v
4	According to the electromagnetic wave theory of light, increasing the intensity of incident light should increase the	A. number of photoelectrons B. size of the photoelectrons C. charge on photoelectrons D. K.E of photoelectrons
5	When a platinum wire is heated, it appears orange red at	A. 500°C B. 900°C C. 1100°C D. 1300°C
6	The Nobel Prize on the explanation of photoelectric effect was awarded to:	A. Max. Planck B. Maxwell C. Bohr D. Rutherford
7	A photon is considered to have	A. Momentum B. Energy C. Wavelength D. All of the above
8	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	A. 1.66 m B. 1.0 m C. 0.66 m D. 2.66 m
9	Photoelectric effect takes place with a photon of:	A. Very high energy B. Very low energy C. Low energy D. High energy
10	If a body reaches a speed equal to the speed of light, then its mass will became	A. zero B. very small C. infinity 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

Electromagnetic radiation or photons interact with matter in

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

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

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

Electromagnetic -radiation means:

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

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

S.I. unit of planks constant is

The nature of radiations emitted by a hot body depends upon its:

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

The positron was discovered by:

The length contraction happens only

Intensity of light determines the:

Which of the following phenomenon proves the particle nature of light

Davision and Germer performed experiment to verify

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

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

The general theory of relativity treats problems involving

Strictly speaking, the earth is:

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

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

Wien's constant is measured in:

The ratio of energy E to the corresponding frequency (f) of the radiation (emitted or absorbed) is called:

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

When a platinum wire is heated, it appears orange red at

When platinum wire is heated, it appears cherry red at

Pair production is the phenomenon in which

Photoelectrons are emitted when ultraviolet light falls on:

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

In order to produce pair production, a photon must have a energy

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ECAT Physics Chapter 19 Important MCQ's

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