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 special theory of relativity is based on the	A. one postulate B. two postulates C. three postulates D. four postulates
2	Victor de-Brogile received the Nobel prize in physics in	A. 1925 B. 1929 C. 1932 D. 1935
3	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
4	An intertial frame of reference is a frame of reference which is	A. at rest B. moving with uniform velocity C. either at rest or moving with uniform velocity D. none of these
5	An inertial frame is that frame in which	A. a>0 B. a=0 C. a<0 D. none of these
6	The threshold frequency of sodium is 6 x 10⁶MHz. The cut-off wavelength for this metal will be	A. 500 m B. 500 nm C. 500 km D. 500 cm
7	Photocell is a device which converts	A. chemical energy into electrical energy B. electrical energy into light energy C. heat energy into electrical energy D. light energy into electrical energy
8	The inside cavity of the black body is	A. painted white B. painted silver C. blackened with soot D. painted red
9	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
10	The Stephen-Boltzmann law for the black body radiation is given by	A. E = T² B. E = -T² C. E = T⁴ D. E = -T⁴

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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

Intensity of light determines the:

Compton was awarded Nobel prize in physics in

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

An inertial frame is that frame in which

If you are moving at relativistic speed between two points that are a fixed distance apart, then the distance between the two points appers

The special theory of relativity treats problems invoving

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

The mass of an object will be doubled at speed

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

Momentum is a parameter associated with

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

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

There is no way to detect:

The positron was discovered by:

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

A photon is considered to have

When a platinum wire is heated, it appears white at

From the theory of relativity, momentum p of the photon is related to energy as

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

The general theory of relativity treats problems involving

Pair production is the phenomenon in which

The Stephen-Boltzmann law for the black body radiation is given by

Compton shift refers to:

de-Broglies hypthesis was experimentally verified by

Which of the following phenomenon proves the particle nature of light

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

Electromagnetic radiation or photons interact with matter in

The idea of quantization of energy was proposed by:

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

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

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