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 emission of electrons from a metal surface when exposed to light of suitable frequency is called the	A. pair production B. Compton effect C. photoelectric effect D. relativity
2	Electromagnetic -radiation means:	A. Photons B. protons C. Electrons D. Mesons
3	Wien's constant is measured in:	A. Metre per kelviin B. Metre kelvin C. Kelvin per meter D. Joules
4	Max Planck received the Nobel Prize for his discovery of energy quants in:	A. 1718 AD B. 1918 AH C. 1818 AD D. 1918 AD
5	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
6	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
7	Which of the following phenomenon proves the particle nature of light	A. interference B. diffraction C. photoelectric effect D. none of these
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	The intensity of emitted energy (with wavelength) radiated from a black body at different temperatures was initially measured by:	A. Lummer B. Planck C. Pringsheim D. Both (A ) and (B)
10	The year when A.H. compton was awarded Nobel Prize is:	A. 1923 B. 1927 C. 1931 D. 1935

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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

Which one of the following physical quantities changes with relativistic speed

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

Compton shift refers to:

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

When a platinum wire is heated, it appears orange 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

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

The special theory of relativity treats problems invoving

At the temperature, a body emits radiation which is principally

Intensity of light determines the:

A black body is

Which of the following is not an example of intertial frame

The photon of radio-waves has energy of about

The value of threshold frequency for different metals is

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

Strictly speaking, the earth is:

The concept of direction and position are purely

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

The special theory of relatively treats the problems involving:

When a platinum wire is heated, it appears dull red at about

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

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

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:

When platinum wire is heated, it appears cherry red at

Wave nature of particle was proposed by

When monochromatic light is allowed to fall on cathode, it begins to emit electrons, these electrons are called

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

The way through which electromagnetic radiations or photons interact with matter depends upon their:

The general theory of relativity treats problems involving

The length contraction happens only

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ECAT Physics Chapter 19 Important MCQ's

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