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

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

Question # 2

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

Question # 3

As the light shines on the metal surface, the electrons are ejected

Question # 4

Compton shift refers to:

Question # 5

Compton derived an expression to find compton shift by applying to the process, the law of conservation of:

Question # 6

At the temperature, a body emits radiation which is principally

Question # 7

Electromagnetic -radiation means:

Question # 8

When a position comes close to an electron they annihilate into

Question # 9

Pair production is the phenomenon in which

Question # 10

Compton was awarded Nobel prize in physics in

Question # 11

The general theory of relativity treats problems involving

Question # 12

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

Question # 13

Which of the following is not an example of intertial frame

Question # 14

Electromagnetic radiation or photons interact with matter in

Question # 15

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

Question # 16

The mass 'm' of a body moving at 0.8 c (whose rest mass is mo) becomes

Question # 17

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

Question # 18

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

Question # 19

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

Question # 20

The positron was discovered by:

Question # 21

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

Question # 22

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 # 23

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

Question # 24

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

Question # 25

Victor de-Brogile received the Nobel prize in physics in

Question # 26

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

Question # 27

Davision and Germer performed experiment to verify

Question # 28

Newton's law of motion do not hold in

Question # 29

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

Question # 30

When platinum wire is heated, it appears cherry red at

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 When a position comes close to an electron they annihilate into photons such that
A. each photon has energy 0.51 Me v
B. each photon has energy 1.02 Me v
C. each photon has energy 0.25 Me v
D. none of these
2 The photon of radio-waves has energy of about
A. 1 Me V
B. 1 Ke v
C. 10-10e v
D. 1010e v
3 The unit of work function is:
A. Joule
B. Electron volt
C. That of threshold frequency
D. Both (A) and (B)
4 The concept of direction is purely:
A. Absolute
B. Relative
C. Relative to stars always
D. Relative to the sun always
5 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
A. 2.9 s
B. 3.0 s
C. 6.6 s
D. 9.6 s
6 de-Broglies hypthesis was experimentally verified by
A. Maxwell
B. Compton
C. Einstein
D. Davison and Germer
7 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
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 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
10 Victor de-Brogile received the Nobel prize in physics in
A. 1925
B. 1929
C. 1932
D. 1935

Test Questions

Is this page helpful?