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	Momentum is a parameter associated with	A. wave motion B. particle motion C. neither wave nor particle motion D. none of these
2	Photoelectric effect takes place with a photon of:	A. Very high energy B. Very low energy C. Low energy D. High energy
3	With the help of 50 K v electron microscope, a resolution of	A. 0.5 to 1 m to possible B. 1 m to 10 m is possible C. 0.5 to 1 nm is possible D. 1 to 10 nm is possible
4	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
5	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	A. 2.9 s B. 3.0 s C. 6.6 s D. 9.6 s
6	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
7	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
8	The location and speed anywhere on earth can now be determined using relativistic effects by NAVISTAR to an accuracy of	A. 2 cm/s B. 20 cm/s C. 200 cm/s D. 2000 cm/s
9	A photon is considered to have	A. Momentum B. Energy C. Wavelength D. All of the above
10	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

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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

In the compton's effect, it is found that the wavelength of incident x-rays is

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:

At the temperature, a body emits radiation which is principally

According to the special theory of relativity, a moving clock

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

Victor de-Brogile received the Nobel prize in physics in

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

A black body is

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

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

When platinum wire is heated, it appears cherry red at

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

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

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

Electromagnetic radiation or photons interact with matter in

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

Which of the following phenomenon proves the particle nature of light

When a position comes close to an electron they annihilate into photons such that

When a platinum wire is heated, it appears white at

The positron was discovered by:

The energy of the 4th orbit in hydrogen atom is

Converse of pair production is known as

According to the de-Brogile relation, an object of large mass and ordinary speed has

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

Compton shift refers to:

the symbol to be used in relativity problems denotes:

The energy of photon 'E' is proported to

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

Current, voltage, resistance measuring circuit is connected with the galvanometer with the help of switch, known as

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