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 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	Compton shift refers to:	A. Photon B. Meson C. Proton D. Positron
3	The special theory of relativity treats problems invoving	A. inertial frame of references B. accelerating frame of references C. both of these D. none of these
4	The photon of radio-waves has energy of about	A. 1 Me V B. 1 Ke v C. 10^-10e v D. 10¹⁰e v
5	Electromagnetic radiation or photons interact with matter in	A. two distinct ways B. three distinct ways C. four distinct ways D. five distinct ways
6	According to the special theory of relativity, a moving clock	A. runs faster B. runs slower C. neither runs faster nor slower D. all of these
7	Pair production is the phenomenon in which	A. matter is converted into energy B. energy is converted into matter C. light is converted into electrical energy D. electrical energy is converted into light
8	Strictly speaking, the earth is:	A. An accelerated frame of reference B. A non-inertial frame of reference C. An inertial frame of reference D. ^{A non-accelerated frame of reference}
9	Albert Einstein got the Nobel prize in physics for his explanation of photoelectric effect in	A. 1916 B. 1919 C. 1921 D. 1923
10	When a platinum wire is heated, it appears dull red at about	A. 500°C B. 900°C C. 1100°C D. 1300°C

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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

The Einstein's changes in length, mass and time are not observed in common life because

In photoelectric effect the energy of ejected electrons depend on

The special theory of relativity is based on:

Compton was awarded Nobel prize in physics in

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:

Absolute motion cannot be detected

The energy of a photon is represented by

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

The concept of direction is purely:

At the temperature, a body emits radiation which is principally

The photon of radio-waves has energy of about

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

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

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

The positron was discovered by:

The energy of a photon in a beam of infrared radiation of wavelength 1240 nm is

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

Victor de-Brogile received the Nobel prize in physics in

According to the special theory of relativity, a moving clock

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

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

When a position comes close to an electron they annihilate into

The unit of work function is:

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

In process of annihilation of matter, the two photons produced move in opposite direction to converse

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 stopping voltage for a certain metal is 100 volts, then the work function for the cathode plate is

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

Intensity of light determines the:

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

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