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

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khadim Hussain 03 - Mar - 2021 10 Min 50 Sec 75/120
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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	As the light shines on the metal surface, the electrons are ejected	A. slowly B. instantaneously C. either of these D. none of these
2	A black body is	A. an ideal absorber B. an ideal radiator C. both of them D. none of them
3	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
4	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
5	An intertial frame of reference is a frame of reference which is	A. at rest B. moving with uniform velocity C. either at rest or moving with uniform velocity D. none of these
6	The year when A.H. compton was awarded Nobel Prize is:	A. 1923 B. 1927 C. 1931 D. 1935
7	Position was discovered by Carl Anderson in	A. 1920 B. 1925 C. 1928 D. 1932
8	Converse of pair production is known as	A. Compton effect B. annihilation of matter C. photoelectric effect D. none of these
9	A particle of mass 5.0 mg moves with a speed of 8.0 m/s. Its de-Brogile wavelength is	A. 1.66 m B. 1.66 x 10^-10m C. 1.66 x 10^-29cm D. 1.66 x 10^-29m
10	The special theory of relativity is based on the	A. one postulate B. two postulates C. three postulates D. four postulates

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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 whole shape of the black body spectrum for all wavelengths was explained by the formula proposed by

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

Photoelectrons are emitted when ultraviolet light falls on:

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

When platinum wire is heated, it appears cherry red at

A photon is considered to have

The concept of direction and position are purely

The positron was discovered by:

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

Which of the following is not an example of intertial frame

Which one of the following physical quantities changes with relativistic speed

The concept of direction is purely:

The photoelectric effect, the maximum energy of photoelectrons depends on the

The special theory of relativity is based on the

The Nobel Prize on the explanation of photoelectric effect was awarded to:

The special theory of relativity treats problems invoving

the symbol to be used in relativity problems denotes:

At the temperature, a body emits radiation which is principally

S.I. unit of planks constant is

Pair production is the phenomenon in which

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

Max plank founded a mathematical model resulting in an equation that describes the shape of observed black body radiation curves exactly, in

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 or photons interact with matter in

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

If the radius of first orbit of hydrogen atom is 0.53° A the radius of second orbit will be

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

The nature of radiations emitted by a hot body depends upon its:

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

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

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