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	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
2	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
3	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	A. 1.66 m B. 1.0 m C. 0.66 m D. 2.66 m
4	A high temperature, the proportion of shorter wavelengths radiation, emitted by the body	A. decreases B. first increases then decreases C. increases D. any one of them
5	Electromagnetic -radiation means:	A. Photons B. protons C. Electrons D. Mesons
6	Wave nature of particle was proposed by	A. Einstein B. Plank C. De-Brogile D. Max well
7	According to the de-Brogile relation, an object of large mass and ordinary speed has	A. very small wavelength B. very large wavelength C. very small frequency D. all of these
8	When monochromatic light is allowed to fall on cathode, it begins to emit electrons, these electrons are called	A. thermoionic electrons B. free electrons C. photoelectrons D. slow electrons
9	In process of annihilation of matter, the two photons produced move in opposite direction to converse	A. momentum B. charge C. energy D. mass
10	The stopping voltage for a certain metal is 100 volts, then the work function for the cathode plate is	A. 100 J B. 1.6 x 10^-17J C. 100 eV D. 1.6 x 10^-17eV

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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

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

Absolute motion cannot be detected

According to the special theory of relativity, a moving clock

The special theory of relatively treats the problems involving:

An electron is accelerated through a potential difference of 50v. its de-Brogile wavelength is

The inside cavity of the black body is

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

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

The energy of a photon is represented by

Which of the following is not an example of intertial frame

The length contraction happens only

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

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

If the radius of first orbit of hydrogen atom is 0.53° A the radius of second orbit will be

Which one of the following physical quantities changes with relativistic speed

A high temperature, the proportion of shorter wavelengths radiation, emitted by the body

Photocell is a device which converts

The idea of quantization of energy was proposed by:

Momentum is a parameter associated with

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

The concept of direction and position are purely

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

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

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

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

Position and momentum of a particle cannot both be measured simultaneously with perfect accuracy. This is the statement of

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

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

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

Intensity of light determines the:

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