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 value of threshold frequency for different metals is	A. different B. same C. may be different or may be same D. none of these
2	The idea of quantization of energy was proposed by:	A. Einstein B. Max.Planck C. Maxwell D. Bohr
3	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
4	The unit of work function is:	A. Joule B. Electron volt C. That of threshold frequency D. Both (A) and (B)
5	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
6	Electromagnetic radiation or photons interact with matter in	A. two distinct ways B. three distinct ways C. four distinct ways D. five distinct ways
7	The whole shape of the black body spectrum for all wavelengths was explained by the formula proposed by	A. Max plank B. Newton C. Einstein D. J.J. Thomson
8	Compton shift refers to:	A. Photon B. Meson C. Proton D. Positron
9	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
10	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

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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

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

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

S.I. unit of planks constant is

The idea of quantization of energy was proposed by:

Which one of the following physical quantities changes with relativistic speed

In photoelectric effect the energy of ejected electrons depend on

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

The emission of electrons from a metal surface when exposed to light of suitable frequency is called the

Wave nature of particle was proposed by

Photoelectric effect takes place with a photon of:

Which of the following is not an example of intertial frame

An electron is accelerated through a potential difference of 50v. its de-Brogile wavelength is

The concept of direction and position are purely

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

The existence of position was predicted by Dirace in

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

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 photon is considered to have

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

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

Compton shift refers to:

At the temperature, a body emits radiation which is principally

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

When a platinum wire is heated, it appears yellow at

Strictly speaking, the earth is:

The concept of direction is purely:

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

The positron was discovered by:

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

The value of threshold frequency for different metals is

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ECAT Physics Chapter 19 Important MCQ's

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