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

  • Total Questions30

  • Time Allowed30

Start Test Download PDF

ECAT Pre General Science Physics Chapter 19 Dawn of Modern Physics

00:00
Question # 1

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

Question # 2

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

Question # 3

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

Question # 4

Current, voltage, resistance measuring circuit is connected with the galvanometer with the help of switch, known as

Question # 5

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

Question # 6

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

Question # 7

From the theory of relativity, momentum p of the photon is related to energy as

Question # 8

In photoelectric effect the energy of ejected electrons depend on

Question # 9

The concept of direction and position are purely

Question # 10

According to the special theory of relativity, a moving clock

Question # 11

Compton studied the scattering of x-rays by loosely bound electrons from:

Question # 12

The energy of photon 'E' is proported to

Question # 13

de-Broglies hypthesis was experimentally verified by

Question # 14

The positron was discovered by:

Question # 15

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

Question # 16

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

Question # 17

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

Question # 18

The special theory of relativity is based on:

Question # 19

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

Question # 20

Wave nature of particle was proposed by

Question # 21

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 # 22

Strictly speaking, the earth is:

Question # 23

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

Question # 24

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

Question # 25

Which of the following phenomenon proves the particle nature of light

Question # 26

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

Question # 27

In process of annihilation of matter, the two photons produced move in opposite direction to converse

Question # 28

Which of the following is not an example of intertial frame

Question # 29

When a platinum wire is heated, it appears orange red at

Question # 30

The photon of radio-waves has energy of about

Submit

Prepare Complete Set Wise ECAT Pre General Science Physics Chapter 19 Dawn of Modern Physics MCQs Online With Answers


Topic Test

00:00
Submit

Top Scorers Of ECAT Pre General Science Physics Chapter 19 Dawn of Modern Physics MCQ`s Test

  • A
    Asghar Ali 03 - Mar - 2021 10 Min 50 Sec 100/120
  • S
    shamsuddin 19 - Aug - 2021 10 Min 50 Sec 75/120
  • K
    khadim Hussain 03 - Mar - 2021 10 Min 50 Sec 75/120
  • A
    Ali ahmad 19 - Jul - 2018 09 Min 44 Sec 70/120
  • A
    Aarij 08 - Dec - 2024 02 Min 25 Sec 65/120
  • W
    Waleed Ahmed 26 - Feb - 2023 10 Min 00 Sec 65/120
  • Z
    Ziyad Rehman Sheikh 16 - Nov - 2022 07 Min 21 Sec 40/120
  • M
    maha 01 - Mar - 2023 04 Min 24 Sec 35/120

ECAT Physics Chapter 19 Important MCQ's

Sr.# Question Answer
1 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
2 According to Einstein, with the great increase in the speed of the body the relativistic length of the body
A. Remains constant
B. Decreases
C. Increases
D. Reduces to zero
3 In process of annihilation of matter, the two photons produced move in opposite direction to converse
A. momentum
B. charge
C. energy
D. mass
4 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
5 Photoelectric effect takes place with a photon of:
A. Very high energy
B. Very low energy
C. Low energy
D. High energy
6 When a position comes close to an electron they annihilate into
A. one photon
B. two photons which travel in the same direction
C. two photons which travels in the opposite direction
D. two photons which travel in any direction
7 The general theory of relativity treats problems involving
A. inertial frame of references
B. accelerating frame of references
C. both of these
D. none of these
8 G.P. Thomson observer experimentally that electrons and neutrons possess
A. particle-like properties
B. wave-like properties
C. neither particle nor wave like properties
D. none of these
9 Intensity of light determines the:
A. Energy of each photon
B. Number of photons
C. Speed of photons
D. Size of photons
10 the symbol to be used in relativity problems denotes:
A. Dilated time
B. Proper time
C. Life time
D. Half time

Test Questions

Is this page helpful?