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

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  • Chapter NameCh 19 - Down of Modern Physics
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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

The inside cavity of the black body is

Question # 2

The special theory of relatively treats the problems involving:

Question # 3

The value of the plank's constant 'h' is given by

Question # 4

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

Question # 5

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

Question # 6

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

Question # 7

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

Question # 8

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

Question # 9

Which of the following is not an example of intertial frame

Question # 10

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

Question # 11

Electromagnetic radiation or photons interact with matter in

Question # 12

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

Question # 13

There is certain frequency below which no electrons are emitted from the metal surface, this frequency is known as

Question # 14

The existence of position was predicted by Dirace in

Question # 15

Davision and Germer performed experiment to verify

Question # 16

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

Question # 17

0.1 kg mass will be equivalent to the energy

Question # 18

Newton's law of motion do not hold in

Question # 19

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

Question # 20

A bar 1.0 m in length and located along x-axix moves with a speed of 0.75 c with respect to a stationary observer. The length of the bar as measured by the stationary observer is

Question # 21

The mass of an object will be doubled at speed

Question # 22

Photoelectric effect takes place with a photon of:

Question # 23

Momentum is a parameter associated with

Question # 24

The unit of work function is:

Question # 25

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

Question # 26

Victor de-Brogile received the Nobel prize in physics in

Question # 27

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

Question # 28

Pair production is the phenomenon in which

Question # 29

When a platinum wire is heated, it appears white at

Question # 30

Electromagnetic -radiation means:

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