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	In order to produce pair production, a photon must have a energy	A. 0.511 Me v B. 0.256 Me v C. 1.02 Me v D. 0.956 Me v
2	According to Einstein, with the great increase in the speed of the body the relativistic length of the body	A. Remains constant B. Decreases C. Increases D. Reduces to zero
3	When a platinum wire is heated, it appears orange red at	A. 500°C B. 900°C C. 1100°C D. 1300°C
4	The general theory of relativity treats problems involving	A. inertial frame of references B. accelerating frame of references C. both of these D. none of these
5	The year when A.H. compton was awarded Nobel Prize is:	A. 1923 B. 1927 C. 1931 D. 1935
6	Photoelectrons are emitted when ultraviolet light falls on:	A. Casium B. Silver C. Potassium D. Any of these
7	The photoelectric effect, the maximum energy of photoelectrons depends on the	A. particular metal surface B. frequency of incident light C. both of them D. none of them
8	The value of threshold frequency for different metals is	A. different B. same C. may be different or may be same D. none of these
9	the dilation of time applies to the timing processes which are:	A. Physical B. Chemical C. Biological D. All of these
10	The inside cavity of the black body is	A. painted white B. painted silver C. blackened with soot D. painted red

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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

Wien's constant is measured in:

Strictly speaking, the earth is:

Electromagnetic radiation or photons interact with matter in

The special theory of relativity is based on the

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

The concept of direction and position are purely

Photocell is a device which converts

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

There is no way to detect:

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

de-Broglies hypthesis was experimentally verified by

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

Momentum is a parameter associated with

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

The value of threshold frequency for different metals is

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

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

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

The photoelectric effect, the maximum energy of photoelectrons depends on the

The idea of quantization of energy was proposed by:

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

the symbol to be used in relativity problems denotes:

The special theory of relativity is based on:

An inertial frame is that frame in which

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

Which of the following phenomenon proves the particle nature of light

Max plank founded a mathematical model resulting in an equation that describes the shape of observed black body radiation curves exactly, in

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

Photoelectric effect takes place with a photon 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