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 year when A.H. compton was awarded Nobel Prize is:	A. 1923 B. 1927 C. 1931 D. 1935
2	According to Einstein, with the great increase in the speed of the body, the relativistic mass of the body	A. Remains constant B. Decreases C. Increases to infinity D. Reduced to zero
3	When a position comes close to an electron they annihilate into	A. one photon B. two photons which travel in the same direction C. two photons which travels in the opposite direction D. two photons which travel in any direction
4	If the radius of first orbit of hydrogen atom is 0.53° A the radius of second orbit will be	A. 2.120°A B. 0.212°A C. 21.2°A D. 0.14° a
5	Photoelectrons are emitted when ultraviolet light falls on:	A. Casium B. Silver C. Potassium D. Any of these
6	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
7	The analysis of the distribution of wavelengths of the radiation emitted from a hot body set the foundation of new mechanics, known as	A. classical mechanics B. Newtonian mechanics C. quantum mechanics D. statistical mechanics
8	Position and momentum of a particle cannot both be measured simultaneously with perfect accuracy. This is the statement of	A. photoelectric effect B. pair production C. Compton effect D. uncertainty principle
9	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
10	Compton studied the scattering of x-rays by loosely bound electrons from:	A. NaCl crystal B. Graphite crystal C. Zirconia D. Copper crystal

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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

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

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

Which one of the following physical quantities changes with relativistic speed

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

In photoelectric effect the energy of ejected electrons depend on

Electromagnetic -radiation means:

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

The special theory of relativity is based on the

Absolute motion cannot be detected

When a platinum wire is heated, it appears white at

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

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

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

A bar 1.0 m in length and located along x-axix moves with a speed of 0.75 c with respect to a stationary observer. The length of the bar as measured by the stationary observer is

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

de-Broglies hypthesis was experimentally verified by

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

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

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

Intensity of light determines the:

The energy of the 4th orbit in hydrogen atom is

An inertial frame is that frame in which

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

The way through which electromagnetic radiations or photons interact with matter depends upon their:

The special theory of relatively treats the problems involving:

Pair production is the phenomenon in which

The positron was discovered by:

When platinum wire is heated, it appears cherry red at

The year when A.H. compton was awarded Nobel Prize is:

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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