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 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)
2	The energy of a photon is represented by	A. h/c² B. h/T C. hc² D. hf/c²
3	The mass 'm' of a body moving at 0.8 c (whose rest mass is mo) becomes	A. 2 mo B. 1.67 mo C. 0.67 mo D. 2.67 mo
4	With the help of 50 K v electron microscope, a resolution of	A. 0.5 to 1 m to possible B. 1 m to 10 m is possible C. 0.5 to 1 nm is possible D. 1 to 10 nm is possible
5	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
6	If A represents linear momentum and c, the velocity of light, then unit of pc in international system of units is:	A. Newton B. Joule C. Joule-Sec D. Joule-s^-1
7	Which of the following phenomenon proves the particle nature of light	A. interference B. diffraction C. photoelectric effect D. none of these
8	According to the special theory of relativity	A. mass and energy are same entities B. mass and energy are same entities but interconverible C. mass and energy are different entities but interconverible D. mass and energy are different entities but non-interconveritble
9	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
10	Max Planck received the Nobel Prize for his discovery of energy quants in:	A. 1718 AD B. 1918 AH C. 1818 AD D. 1918 AD

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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

Which of the following is not an example of intertial frame

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

The value of the Stephen's constant for black body radiations is given by

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:

The photon of radio-waves has energy of about

When the atomic particle are moving with velocities approaching that of light:

Which one of the following physical quantities changes with relativistic speed

As the light shines on the metal surface, the electrons are ejected

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

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

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

Intensity of light determines the:

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

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

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

Wave nature of particle was proposed by

When a platinum wire is heated, it appears yellow at

de-Broglies hypthesis was experimentally verified by

Electromagnetic radiation or photons interact with matter in

According to the special theory of relativity

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

The special theory of relatively treats the problems involving:

Which of the following phenomenon proves the particle nature of light

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

Momentum is a parameter associated with

The idea of quantization of energy was proposed by:

An inertial frame is that frame in which

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

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

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

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