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

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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 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
2	The positron was discovered by:	A. In cosmic radiation B. In 1932 C. By Carl Anderson D. All above
3	In photoelectric effect the energy of ejected electrons depend on	A. The frequency B. The intensity C. Both frequency and intensity D. None of these
4	The energy of the 4th orbit in hydrogen atom is	A. 2.5 ev B. - 3.5 ev C. -0.85 ev D. -13.6 ev
5	Which of the following is not an example of intertial frame	A. a body placed on the surface of earth B. a body placed in a car moving with uniform velocity C. a body placed in a car moving with same acceleration D. none of these
6	Practically the quantity v/c is always:	A. less than one B. Equal to one C. Greater then one D. all of these
7	The mass 'm' of a body moving at 0.8 c (whose rest mass is mo) becomes	A. 2 mo B. 1.67 mo C. 0.67 mo D. 2.67 mo
8	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
9	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:	A. Smaller B. Lerger C. Same D. Much larger
10	The special theory of relativity treats problems invoving	A. inertial frame of references B. accelerating frame of references C. both of these 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

Max plank founded a mathematical model resulting in an equation that describes the shape of observed black body radiation curves exactly, in

Wien's constant is measured in:

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

Victor de-Brogile received the Nobel prize in physics in

The year when A.H. compton was awarded Nobel Prize is:

When platinum wire is heated, it appears cherry red at

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

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

Intensity of light determines the:

At the temperature, a body emits radiation which is principally

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

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

S.I. unit of planks constant is

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

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

The value of the plank's constant 'h' is given by

Davision and Germer performed experiment to verify

Electromagnetic radiation or photons interact with matter in

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

Absolute motion cannot be detected

The concept of direction is purely:

There is no way to detect:

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

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

The positron was discovered by:

Practically the quantity v/c is always:

Photoelectric effect takes place with a photon of:

According to the special theory of relativity, a moving clock

In process of annihilation of matter, the two photons produced move in opposite direction to converse

Albert Einstein got the Nobel prize in physics for his explanation of photoelectric effect in

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ECAT Physics Chapter 19 Important MCQ's

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