ECAT Pre Computer Science Chapter 19 MCQ Test With Answer

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

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

  • Total Questions15

  • Time Allowed20

Start Test Download PDF

ECAT Physics Chapter 19 Dawn of Modern Physics

00:00
Question # 1

The Stephen-Boltzmann law for the black body radiation is given by

Question # 2

Strictly speaking, the earth is:

Question # 3

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

Question # 4

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

Question # 5

The energy of photon 'E' is proported to

Question # 6

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

Question # 7

Position was discovered by Carl Anderson in

Question # 8

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

Question # 9

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

Question # 10

The energy of the 4th orbit in hydrogen atom is

Question # 11

According to the special theory of relativity

Question # 12

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

Question # 13

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

Question # 14

The inside cavity of the black body is

Question # 15

According to the special theory of relativity, a moving clock

Submit

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


Topic Test

00:00
Submit

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

  • A
    Anayat Ali 03 - Apr - 2024 00 Min 25 Sec 60/60
  • H
    HAMZA Shah 21 - Sep - 2021 00 Min 42 Sec 60/60
  • U
    Umer Usman 10 - Mar - 2024 01 Min 08 Sec 60/60
  • S
    Sanja Account 28 - Jun - 2026 02 Min 38 Sec 56/60
  • S
    Sana Hashim 23 - May - 2022 02 Min 21 Sec 55/60
  • T
    Tayyaba 28 - Feb - 2018 04 Min 27 Sec 55/60
  • A
    Abdullah Baloch 11 - Aug - 2024 04 Min 52 Sec 55/60
  • R
    Rabbia Munir 06 - Mar - 2024 02 Min 16 Sec 50/60
  • M
    MusiCore 15 - Mar - 2023 02 Min 27 Sec 50/60
  • M
    Muqadas Zahra 14 - Apr - 2022 02 Min 34 Sec 45/60
  • Z
    Zia Ullah Chahal 08 - Mar - 2024 01 Min 39 Sec 40/60
  • B
    Benjamin Joseph 01 - Mar - 2023 02 Min 51 Sec 40/60
  • A
    arbeel ejaz 09 - Mar - 2023 04 Min 07 Sec 40/60
  • F
    Farhan 07 - Jan - 2019 05 Min 18 Sec 40/60
  • N
    nageena safdar 08 - Jul - 2024 09 Min 20 Sec 40/60

ECAT Physics Chapter 19 Important MCQ's

Sr.# Question Answer
1 S.I. unit of planks constant is
A. J-s-1
B. J.s
C. J.s-2
D. J.s2
2 The special theory of relatively treats the problems involving:
A. Inertial frames of reference
B. Non-inertial frames
C. Non-accelerated frame
D. Botha (A) and (C)
3 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
4 If you are moving at relativistic speed between two points that are a fixed distance apart, then the distance between the two points appers
A. larger
B. shorter
C. equal
D. none of these
5 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
6 The Einstein's changes in length, mass and time are not observed in common life because
A. We dont observer then seriously
B. The masses are too large
C. Their speed is too small than the speed of right
D. All of the above
7 The photoelectric effect, the maximum energy of photoelectrons depends on the
A. particular metal surface
B. frequency of incident light
C. both of them
D. none of them
8 Due to relative motion of observer and the frame of reference of events, time always:
A. Dilates itself
B. Contracts itself
C. Stretches itself
D. Both (A) and (C)
9 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
10 the symbol to be used in relativity problems denotes:
A. Dilated time
B. Proper time
C. Life time
D. Half time

Test Questions

Share your comments & questions here

Guest

  • No comments yet. Be the first to comment!