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 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
2	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
3	The mass of an object will be doubled at speed	A. 1.6 x 10⁸ms^-1 B. 2.6 X 10⁸ms^-1 C. 2.6 x 10⁷ms^-1 D. 2.6 x 10⁹ms^-1
4	There is certain frequency below which no electrons are emitted from the metal surface, this frequency is known as	A. maximum frequency B. minimum frequency C. threshold frequency D. all of these
5	Which one of the following physical quantities changes with relativistic speed	A. Length B. Mass C. Time D. All of the above
6	According to the special theory of relativity	A. mass and energy are same entities B. mass and energy are same entities but interconverible C. mass and energy are different entities but interconverible D. mass and energy are different entities but non-interconveritble
7	When a platinum wire is heated, it appears white at	A. 1600°C B. 900°C C. 1100°C D. 1300°C
8	The year when A.H. compton was awarded Nobel Prize is:	A. 1923 B. 1927 C. 1931 D. 1935
9	Wave nature of particle was proposed by	A. Einstein B. Plank C. De-Brogile D. Max well
10	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

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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

If the radius of first orbit of hydrogen atom is 0.53° A the radius of second orbit will be

According to the Max plank, energy is redialed or absorbed in

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

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

The energy of a photon is represented by

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

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

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

There is no way to detect:

The special theory of relativity is based on:

The value of threshold frequency for different metals is

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

An inertial frame is that frame in which

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

The length contraction happens only

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

Electromagnetic -radiation means:

A high temperature, the proportion of shorter wavelengths radiation, emitted by the body

If A represents linear momentum and c, the velocity of light, then unit of pc in international system of units is:

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

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

The concept of direction and position are purely

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

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

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

According to the special theory of relativity, time is

Strictly speaking, the earth is:

Converse of pair production is known as

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

A black body is

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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