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 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	Compton derived an expression to find compton shift by applying to the process, the law of conservation of:	A. Energy only B. Momentum only C. Mass only D. Charge only
3	The energy of the 4th orbit in hydrogen atom is	A. 2.5 ev B. - 3.5 ev C. -0.85 ev D. -13.6 ev
4	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
5	Intensity of light determines the:	A. Energy of each photon B. Number of photons C. Speed of photons D. Size of photons
6	The special theory of relativity is based on:	A. Four postulates B. Three postulates C. Two postulates D. One postulate
7	A black body is	A. an ideal absorber B. an ideal radiator C. both of them D. none of them
8	When a platinum wire is heated, it appears white at	A. 1600°C B. 900°C C. 1100°C D. 1300°C
9	The unit of work function is:	A. Joule B. Electron volt C. That of threshold frequency D. Both (A) and (B)
10	A particle having mass and charge equal to that of an electron is called:	A. Proton B. Positron C. Pion D. Pi-meson

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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

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

The special theory of relativity is based on the

According to the electromagnetic wave theory of light, increasing the intensity of incident light should increase the

Position was discovered by Carl Anderson in

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

0.1 kg mass will be equivalent to the energy

Strictly speaking, the earth is:

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

Electromagnetic -radiation means:

The special theory of relativity is based on:

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

According to the special theory of relativity, a moving clock

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:

Wien's constant is measured in:

The unit of work function is:

When a position comes close to an electron they annihilate into

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

The inside cavity of the black body is

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

Which of the following phenomenon proves the particle nature of light

Photoelectrons are emitted when ultraviolet light falls on:

At the temperature, a body emits radiation which is principally

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

Practically the quantity v/c is always:

There is no way to detect:

When platinum wire is heated, it appears cherry red at

The energy of a photon is represented by

Newton's law of motion do not hold in

Momentum is a parameter associated with

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

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ECAT Physics Chapter 19 Important MCQ's

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