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	A black body is	A. an ideal absorber B. an ideal radiator C. both of them D. none of them
3	If a body reaches a speed equal to the speed of light, then its mass will became	A. zero B. very small C. infinity D. none of these
4	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
5	The special theory of relativity is based on the	A. one postulate B. two postulates C. three postulates D. four postulates
6	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
7	Momentum is a parameter associated with	A. wave motion B. particle motion C. neither wave nor particle motion D. none of these
8	Which one of the following physical quantities changes with relativistic speed	A. Length B. Mass C. Time D. All of the above
9	Electromagnetic radiation or photons interact with matter in	A. two distinct ways B. three distinct ways C. four distinct ways D. five distinct ways
10	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

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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 positron was discovered by:

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

If a body reaches a speed equal to the speed of light, then its mass will became

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

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

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

The special theory of relativity is based on:

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

The energy of a photon is represented by

The inside cavity of the black body is

At the temperature, a body emits radiation which is principally

When a platinum wire is heated, it appears white at

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

Max Planck received the Nobel Prize for his discovery of energy quants in:

If A represents linear momentum and c, the velocity of light, then unit of pc in international system of units is:

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

Wien's constant is measured in:

According to the de-Brogile relation, an object of large mass and ordinary speed has

The special theory of relativity treats problems invoving

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

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

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

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

Which of the following is not an example of intertial frame

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

The Nobel Prize on the explanation of photoelectric effect was awarded to:

Which of the following phenomenon proves the particle nature of light

Due to relative motion of observer and the frame of reference of events, time always:

Photoelectric effect takes place with a photon of:

Compton derived an expression to find compton shift by applying to the process, the law of conservation of:

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ECAT Physics Chapter 19 Important MCQ's

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