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	When platinum wire is heated, it appears cherry red at	A. 1600°C B. 900°C C. 1100°C D. 1300°C
2	According to the special theory of relativity, time is	A. absolute quantity B. not absolute quantity C. constant quantity D. none of these
3	The intensity of emitted energy (with wavelength) radiated from a black body at different temperatures was initially measured by:	A. Lummer B. Planck C. Pringsheim D. Both (A ) and (B)
4	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
5	The nature of radiations emitted by a hot body depends upon its:	A. Metarial B. Temperature C. colour D. Volume
6	When a high energy photon interact with a metal, which of the following effect is most likely to be taken place	A. pair production B. photoelectric effect C. Compton effect D. None of these
7	As compared to the distance measured by an observer on Earth, the distance from Earth to a star measured by an observer in a moving spaceship would seem:	A. Smaller B. Lerger C. Same D. Much larger
8	From the theory of relativity, momentum p of the photon is related to energy as	A. p = hfc B. p = hf/c C. p = f(hc,f) D. p = cf/h
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	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

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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

Compton was awarded Nobel prize in physics in

The idea of quantization of energy was proposed by:

A photon is considered to have

When platinum wire is heated, it appears cherry red at

If a material object moves with the speed of light 'C' its mass becomes

The energy of the 4th orbit in hydrogen atom is

Newton's law of motion do not hold in

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

The analysis of the distribution of wavelengths of the radiation emitted from a hot body set the foundation of new mechanics, known as

Compton shift refers to:

According to the special theory of relativity, time is

The general theory of relativity treats problems involving

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

A black body is

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

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

Current, voltage, resistance measuring circuit is connected with the galvanometer with the help of switch, known as

S.I. unit of planks constant is

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

The special theory of relativity is based on the

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

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

G.P. Thomson observer experimentally that electrons and neutrons possess

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

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

The mass 'm' of a body moving at 0.8 c (whose rest mass is mo) becomes

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

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

The inside cavity of the black body is

Wave nature of particle was proposed by

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ECAT Physics Chapter 19 Important MCQ's

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