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 positron was discovered by:	A. In cosmic radiation B. In 1932 C. By Carl Anderson D. All above
2	When a platinum wire is heated, it appears yellow at	A. 1600°C B. 900°C C. 1100°C D. 1300°C
3	The energy of photon 'E' is proported to	A. The magnetic field H B. The electric field E C. Both the electric and magnetic field H and E D. Frequency
4	G.P. Thomson observer experimentally that electrons and neutrons possess	A. particle-like properties B. wave-like properties C. neither particle nor wave like properties D. none of these
5	In photoelectric effect the energy of ejected electrons depend on	A. The frequency B. The intensity C. Both frequency and intensity D. None of these
6	Momentum is a parameter associated with	A. wave motion B. particle motion C. neither wave nor particle motion D. none of these
7	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
8	The idea of quantization of energy was proposed by:	A. Einstein B. Max.Planck C. Maxwell D. Bohr
9	Electromagnetic -radiation means:	A. Photons B. protons C. Electrons D. Mesons
10	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

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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

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

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

According to the special theory of relativity, a moving clock

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

Electromagnetic radiation or photons interact with matter in

Photoelectric effect takes place with a photon of:

The unit of work function is:

The length contraction happens only

Newton's law of motion do not hold in

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

When a platinum wire is heated, it appears white at

The special theory of relativity is based on:

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

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

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

When a platinum wire is heated, it appears orange red at

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

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

Photoelectrons are emitted when ultraviolet light falls on:

The location and speed anywhere on earth can now be determined using relativistic effects by NAVISTAR to an accuracy of

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

Position was discovered by Carl Anderson in

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

The energy of the 4th orbit in hydrogen atom is

When a position comes close to an electron they annihilate into

When a platinum wire is heated, it appears yellow at

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

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

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

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

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