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	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
2	Davision and Germer performed experiment to verify	A. de-Brogile hypothesis B. theory of relativity C. Newton's law of gravitation D. Mass-energy relation
3	When platinum wire is heated, then at the temperature of 500 ^oC, it becomes:	A. Yellow B. Orange red C. Dull red D. White
4	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
5	Victor de-Brogile received the Nobel prize in physics in	A. 1925 B. 1929 C. 1932 D. 1935
6	The unit of work function is:	A. Joule B. Electron volt C. That of threshold frequency D. Both (A) and (B)
7	Compton studied the scattering of x-rays by loosely bound electrons from:	A. NaCl crystal B. Graphite crystal C. Zirconia D. Copper crystal
8	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
9	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
10	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

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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

At the temperature, a body emits radiation which is principally

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

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

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

The special theory of relativity treats problems invoving

Victor de-Brogile received the Nobel prize in physics in

The energy of photon 'E' is proported to

Converse of pair production is known as

The value of threshold frequency for different metals is

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

When a platinum wire is heated, it appears yellow at

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

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

When platinum wire is heated, then at the temperature of 500 oC, it becomes:

The concept of direction and position are purely

The concept of direction is purely:

According to the special theory of relativity, time is

Strictly speaking, the earth is:

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

The inside cavity of the black body is

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

In photoelectric effect the energy of ejected electrons depend on

When a platinum wire is heated, it appears orange red at

The existence of position was predicted by Dirace in

Practically the quantity v/c is always:

The energy of a photon is represented by

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

The value of the Stephen's constant for black body radiations is given by

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

Which of the following is not an example of intertial frame

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ECAT Physics Chapter 19 Important MCQ's

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When platinum wire is heated, then at the temperature of 500 ^oC, it becomes:

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