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

Try The MCQ's Test For ECAT Pre General Science Physics Chapter 19 Dawn of Modern Physics

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ECAT Pre General Science Physics Chapter 19 Dawn of Modern Physics

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Question # 1

The special theory of relatively treats the problems involving:

Question # 2

0.1 kg mass will be equivalent to the energy

Question # 3

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

Question # 4

Converse of pair production is known as

Question # 5

If you are moving at relativistic speed between two points that are a fixed distance apart, then the distance between the two points appers

Question # 6

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

Question # 7

An electron is accelerated through a potential difference of 50v. its de-Brogile wavelength is

Question # 8

The energy of photon 'E' is proported to

Question # 9

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

Question # 10

Newton's law of motion do not hold in

Question # 11

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

Question # 12

Momentum is a parameter associated with

Question # 13

Compton shift refers to:

Question # 14

Max plank received the Nobel Prize in physics for his discovery of energy quanta in

Question # 15

The threshold frequency of sodium is 6 x 106MHz. The cut-off wavelength for this metal will be

Question # 16

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

Question # 17

When a position comes close to an electron they annihilate into photons such that

Question # 18

A photon is considered to have

Question # 19

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 # 20

According to the special theory of relativity, time is

Question # 21

Compton was awarded Nobel prize in physics in

Question # 22

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

Question # 23

Photoelectric effect takes place with a photon of:

Question # 24

The concept of direction and position are purely

Question # 25

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

Question # 26

Victor de-Brogile received the Nobel prize in physics in

Question # 27

If A represents linear momentum and c, the velocity of light, then unit of pc in international system of units is:

Question # 28

The mass of an object will be doubled at speed

Question # 29

Davision and Germer performed experiment to verify

Question # 30

The ratio of energy E to the corresponding frequency (f) of the radiation (emitted or absorbed) is called:

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ECAT Physics Chapter 19 Important MCQ's

Sr.# Question Answer
1 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
2 de-Broglies hypthesis was experimentally verified by
A. Maxwell
B. Compton
C. Einstein
D. Davison and Germer
3 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
4 If A represents linear momentum and c, the velocity of light, then unit of pc in international system of units is:
A. Newton
B. Joule
C. Joule-Sec
D. Joule-s-1
5 A particle having mass and charge equal to that of an electron is called:
A. Proton
B. Positron
C. Pion
D. Pi-meson
6 According to the de-Brogile relation, an object of large mass and ordinary speed has
A. very small wavelength
B. very large wavelength
C. very small frequency
D. all of these
7 With the help of 50 K v electron microscope, a resolution of
A. 0.5 to 1 m to possible
B. 1 m to 10 m is possible
C. 0.5 to 1 nm is possible
D. 1 to 10 nm is possible
8 A high temperature, the proportion of shorter wavelengths radiation, emitted by the body
A. decreases
B. first increases then decreases
C. increases
D. any one of them
9 Electromagnetic -radiation means:
A. Photons
B. protons
C. Electrons
D. Mesons
10 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
A. 1.66 m
B. 1.0 m
C. 0.66 m
D. 2.66 m

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