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	A non-inertial frame of reference is one, in which	A. law of inertial is valid B. all laws of physics are the same in all frames C. a>0 or a<0 D. a=0
2	When a position comes close to an electron they annihilate into photons such that	A. each photon has energy 0.51 Me v B. each photon has energy 1.02 Me v C. each photon has energy 0.25 Me v D. none of these
3	A particle having mass and charge equal to that of an electron is called:	A. Proton B. Positron C. Pion D. Pi-meson
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	According to the Max plank, energy is redialed or absorbed in	A. discrete packets B. continuous waves C. either of them D. none of these
6	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
7	Electromagnetic -radiation means:	A. Photons B. protons C. Electrons D. Mesons
8	Which one of the following physical quantities changes with relativistic speed	A. Length B. Mass C. Time D. All of the above
9	Victor de-Brogile received the Nobel prize in physics in	A. 1925 B. 1929 C. 1932 D. 1935
10	the dilation of time applies to the timing processes which are:	A. Physical B. Chemical C. Biological D. All 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

Absolute motion cannot be detected

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

According to the special theory of relativity, a moving clock

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

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

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

Which one of the following physical quantities changes with relativistic speed

Wave nature of particle was proposed by

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

The idea of quantization of energy was proposed by:

The length contraction happens only

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

Davision and Germer performed experiment to verify

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

Compton shift refers to:

When platinum wire is heated, it appears cherry red 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 concept of direction and position are purely

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

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

Photoelectric effect takes place with a photon of:

Albert Einstein got the Nobel prize in physics for his explanation of photoelectric effect in

The photoelectric effect, the maximum energy of photoelectrons depends on the

Converse of pair production is known as

Momentum is a parameter associated with

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

Which of the following phenomenon proves the particle nature of light

The special theory of relatively treats the problems involving:

The special theory of relativity is based on:

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

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ECAT Physics Chapter 19 Important MCQ's

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