ECAT Pre Engineering Physics Chapter 19 MCQ Test With Answer

MCQ's Test For Physics ECAT Pre Engineering Chapter 19 Dawn of Modern Physics

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

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Physics ECAT Pre Engineering Chapter 19 Dawn of Modern Physics

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Question # 1

When monochromatic light is allowed to fall on cathode, it begins to emit electrons, these electrons are called

Question # 2

The concept of direction and position are purely

Question # 3

According to the special theory of relativity

Question # 4

A particle having mass and charge equal to that of an electron is called:

Question # 5

In photoelectric effect the energy of ejected electrons depend on

Question # 6

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

Question # 7

When platinum wire is heated, then at the temperature of 500 oC, it becomes:

Question # 8

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

Question # 9

Wave nature of particle was proposed by

Question # 10

de-Broglies hypthesis was experimentally verified by

Question # 11

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

Question # 12

An inertial frame is that frame in which

Question # 13

Momentum is a parameter associated with

Question # 14

A photon is considered to have

Question # 15

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

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ECAT Physics Chapter 19 Important MCQ's

Sr.# Question Answer
1 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
2 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
3 If a material object moves with the speed of light 'C' its mass becomes
A. Equal to its rest mass
B. Four times of its rest mass
C. Double of its rest mass
D. Infinite
4 When a high energy photon interact with a metal, which of the following effect is most likely to be taken place
A. pair production
B. photoelectric effect
C. Compton effect
D. None of these
5 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
6 According to the Max plank, energy is redialed or absorbed in
A. discrete packets
B. continuous waves
C. either of them
D. none of these
7 An electron is accelerated through a potential difference of 50v. its de-Brogile wavelength is
A. 1.66 x 10-29m
B. 1.74 x 10-10cm
C. 17.4 x 10-6m
D. 1.74 x 10-10m
8 The concept of direction is purely:
A. Absolute
B. Relative
C. Relative to stars always
D. Relative to the sun always
9 The value of the Stephen's constant for black body radiations is given by
A. 5.6 x 108Wm-2K-4
B. 5.67 x 10-8Wm-2K-4
C. 2.9 x 10-3mK
D. 2.9 x 103mK
10 Electromagnetic -radiation means:
A. Photons
B. protons
C. Electrons
D. Mesons

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