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	Albert Einstein got the Nobel prize in physics for his explanation of photoelectric effect in	A. 1916 B. 1919 C. 1921 D. 1923
2	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
3	Current, voltage, resistance measuring circuit is connected with the galvanometer with the help of switch, known as	A. ON switch B. off switch C. function switch D. none of these
4	The intensity of emitted energy (with wavelength) radiated from a black body at different temperatures was initially measured by:	A. Lummer B. Planck C. Pringsheim D. Both (A ) and (B)
5	The existence of position was predicted by Dirace in	A. 1920 B. 1925 C. 1930 D. 1928
6	The idea of quantization of energy was proposed by:	A. Einstein B. Max.Planck C. Maxwell D. Bohr
7	The value of the Stephen's constant for black body radiations is given by	A. 5.6 x 10⁸Wm^-2K^-4 B. 5.67 x 10^-8Wm^-2K^-4 C. 2.9 x 10^-3mK D. 2.9 x 10³mK
8	A photon is considered to have	A. Momentum B. Energy C. Wavelength D. All of the above
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	The unit of work function is:	A. Joule B. Electron volt C. That of threshold frequency D. Both (A) and (B)

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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

The speed of a pendulum is measured to be 3.0 s in the inertial reference frame of the pendulum. What is its period measured by an observer moving at a speed of 0.95 c with respect to the pendulum

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

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

Which of the following phenomenon proves the particle nature of light

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

The energy of a photon is represented by

Current, voltage, resistance measuring circuit is connected with the galvanometer with the help of switch, known as

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

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

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

The mass of an object will be doubled at speed

When a position comes close to an electron they annihilate into

Wien's constant is measured in:

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

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

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

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

When monochromatic light is allowed to fall on cathode, it begins to emit electrons, these electrons are called

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

The existence of position was predicted by Dirace in

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

Which one of the following physical quantities changes with relativistic speed

There is no way to detect:

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

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

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

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

Pair production is the phenomenon in which

The special theory of relatively treats the problems involving:

When platinum wire is heated, it appears cherry red at

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