ECAT Pre General Science Chapter 19 online mcq test with answers for Physics chapter 19 (Dawn of Modern Physics)

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maha 01 - Mar - 2023 04 Min 24 Sec 35/120

ECAT Physics Chapter 19 Important MCQ's

Sr.#	Question	Answer
1	The value of the plank's constant 'h' is given by	A. 1.6 x 10^-19J B. 1.67 x 10^-27Kg C. 6.63 x 10³⁴Js D. 6.63 x 10^-34Js
2	Wave nature of particle was proposed by	A. Einstein B. Plank C. De-Brogile D. Max well
3	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
4	The length contraction happens only	A. Opposite to the direction of motion B. along the direction of motion C. perpendicular to the direction of motion D. In any direction
5	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:	A. Smaller B. Lerger C. Same D. Much larger
6	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
7	The energy of a photon in a beam of infrared radiation of wavelength 1240 nm is	A. 100 ev B. 10⁶e v C. 10³e v D. 1.0 e v
8	According to Einstein, with the great increase in the speed of the body the relativistic length of the body	A. Remains constant B. Decreases C. Increases D. Reduces to zero
9	Which one of the following physical quantities changes with relativistic speed	A. Length B. Mass C. Time D. All of the above
10	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

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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

At the temperature, a body emits radiation which is principally

When platinum wire is heated, then at the temperature of 500 oC, it becomes:

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

The idea of quantization of energy was proposed by:

The concept of direction is purely:

0.1 kg mass will be equivalent to the energy

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

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

A particle having mass and charge equal to that of an electron is called:

Intensity of light determines the:

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

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

When a position comes close to an electron they annihilate into

Strictly speaking, the earth is:

An inertial frame is that frame in which

Photoelectric effect takes place with a photon of:

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

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

The special theory of relativity is based on:

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

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

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

According to the special theory of relativity, time is

the symbol to be used in relativity problems denotes:

The unit of work function is:

Compton was awarded Nobel prize in physics in

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

The energy of the 4th orbit in hydrogen atom is

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

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ECAT Physics Chapter 19 Important MCQ's

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When platinum wire is heated, then at the temperature of 500 ^oC, it becomes: