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 dilation of time applies to the timing processes which are:	A. Physical B. Chemical C. Biological D. All of these
2	The photoelectric effect, the maximum energy of photoelectrons depends on the	A. particular metal surface B. frequency of incident light C. both of them D. none of them
3	The special theory of relativity is based on:	A. Four postulates B. Three postulates C. Two postulates D. One postulate
4	The idea of quantization of energy was proposed by:	A. Einstein B. Max.Planck C. Maxwell D. Bohr
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	de-Broglies hypthesis was experimentally verified by	A. Maxwell B. Compton C. Einstein D. Davison and Germer
7	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
8	An inertial frame is that frame in which	A. a>0 B. a=0 C. a<0 D. none of these
9	An electron is accelerated through a potential difference of 50v. its de-Brogile wavelength is	A. 1.66 x 10^-29m B. 1.74 x 10^-10cm C. 17.4 x 10^-6m D. 1.74 x 10^-10m
10	According to the special theory of relativity, time is	A. absolute quantity B. not absolute quantity C. constant quantity 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

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

The inside cavity of the black body is

The special theory of relativity is based on the

The energy of the 4th orbit in hydrogen atom is

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

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

When the atomic particle are moving with velocities approaching that of light:

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

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

Intensity of light determines the:

There is no way to detect:

According to the special theory of relativity, time is

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

A photon is considered to have

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

A black body is

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

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

The energy of a photon is represented by

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

The length contraction happens only

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

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

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

Photoelectric effect takes place with a photon of:

The concept of direction and position are purely

At the temperature, a body emits radiation which is principally

Compton shift refers to:

Practically the quantity v/c is always:

When a position comes close to an electron they annihilate into

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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