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	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
2	An intertial frame of reference is a frame of reference which is	A. at rest B. moving with uniform velocity C. either at rest or moving with uniform velocity 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	Compton was awarded Nobel prize in physics in	A. 1921 B. 1923 C. 1925 D. 1927
5	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
6	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
7	The location and speed anywhere on earth can now be determined using relativistic effects by NAVISTAR to an accuracy of	A. 2 cm/s B. 20 cm/s C. 200 cm/s D. 2000 cm/s
8	Photoelectrons are emitted when ultraviolet light falls on:	A. Casium B. Silver C. Potassium D. Any of these
9	A high temperature, the proportion of shorter wavelengths radiation, emitted by the body	A. decreases B. first increases then decreases C. increases D. any one of them
10	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

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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

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

At the temperature, a body emits radiation which is principally

Compton shift refers to:

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

The concept of direction and position are purely

Momentum is a parameter associated with

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

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

The special theory of relativity is based on:

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

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

Pair production is the phenomenon in which

A particle of mass 5.0 mg moves with a speed of 8.0 m/s. Its de-Brogile wavelength is

Electromagnetic radiation or photons interact with matter in

Newton's law of motion do not hold in

A photon is considered to have

Photoelectrons are emitted when ultraviolet light falls on:

Which of the following is not an example of intertial frame

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

If a material object moves with the speed of light 'C' its mass becomes

A non-inertial frame of reference is one, in which

In photoelectric effect the energy of ejected electrons depend on

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

The location and speed anywhere on earth can now be determined using relativistic effects by NAVISTAR to an accuracy of

The special theory of relativity treats problems invoving

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

The intensity of emitted energy (with wavelength) radiated from a black body at different temperatures was initially measured by:

The value of threshold frequency for different metals is

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

There is no way to detect:

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