ECAT Pre General Science Physics Chapter 19 MCQ Test With Answer for Physics chapter 19 (Dawn of Modern Physics)

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ECAT General Science Physics Ch. 19 Test
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Online MCQ`s Test For Chapter 19 "ECAT Pre General Science Physics Chapter 19 Dawn of Modern Physics Online Test"

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ECAT Pre General Science Physics Chapter 19 Dawn of Modern Physics Online Test

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Question # 1

In photoelectric effect the energy of ejected electrons depend on

Question # 2

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

Question # 3

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

Question # 4

When a platinum wire is heated, it appears white at

Question # 5

Photoelectrons are emitted when ultraviolet light falls on:

Question # 6

The energy of photon 'E' is proported to

Question # 7

The general theory of relativity treats problems involving

Question # 8

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

Question # 9

The year when A.H. compton was awarded Nobel Prize is:

Question # 10

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:

Question # 11

The length contraction happens only

Question # 12

The mass of an object will be doubled at speed

Question # 13

the dilation of time applies to the timing processes which are:

Question # 14

The concept of direction is purely:

Question # 15

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

Question # 16

Electromagnetic radiation or photons interact with matter in

Question # 17

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

Question # 18

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

Question # 19

The value of the Stephen's constant for black body radiations is given by

Question # 20

The energy of a photon is represented by

Question # 21

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

Question # 22

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

Question # 23

An inertial frame is that frame in which

Question # 24

When platinum wire is heated, it appears cherry red at

Question # 25

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

Question # 26

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

Question # 27

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

Question # 28

Practically the quantity v/c is always:

Question # 29

According to the special theory of relativity, time is

Question # 30

Victor de-Brogile received the Nobel prize in physics in

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