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 existence of position was predicted by Dirace in	A. 1920 B. 1925 C. 1930 D. 1928
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	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	Max plank founded a mathematical model resulting in an equation that describes the shape of observed black body radiation curves exactly, in	A. 1890 B. 1895 C. 1900 D. 1905
5	According to the electromagnetic wave theory of light, increasing the intensity of incident light should increase the	A. number of photoelectrons B. size of the photoelectrons C. charge on photoelectrons D. K.E of photoelectrons
6	The concept of direction is purely:	A. Absolute B. Relative C. Relative to stars always D. Relative to the sun always
7	Which one of the following physical quantities changes with relativistic speed	A. Length B. Mass C. Time D. All of the above
8	The concept of direction and position are purely	A. absolute B. relative C. absolute or relative D. none of these
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	Converse of pair production is known as	A. Compton effect B. annihilation of matter C. photoelectric effect 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

0.1 kg mass will be equivalent to the energy

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

Strictly speaking, the earth is:

Max plank received the Nobel Prize in physics for his discovery of energy quanta in

Wien's constant is measured in:

The special theory of relativity is based on the

Which of the following is not an example of intertial frame

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

A black body is

The value of threshold frequency for different metals is

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:

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

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

When a position comes close to an electron they annihilate into photons such that

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

An inertial frame is that frame in which

The length contraction happens only

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

Absolute motion cannot be detected

In the compton's effect, it is found that the wavelength of incident x-rays is

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

Compton studied the scattering of x-rays by loosely bound electrons from:

The inside cavity of the black body is

In photoelectric effect the energy of ejected electrons depend on

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

Davision and Germer performed experiment to verify

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

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

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

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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

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