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 a position comes close to an electron they annihilate into

Question # 2

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

Question # 3

A particle of mass 5.0 mg moves with a speed of 8.0 m/s. Its de-Brogile wavelength is

Question # 4

Compton shift refers to:

Question # 5

S.I. unit of planks constant is

Question # 6

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

Question # 7

Victor de-Brogile received the Nobel prize in physics in

Question # 8

The concept of direction is purely:

Question # 9

A photon is considered to have

Question # 10

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

Question # 11

Which of the following phenomenon proves the particle nature of light

Question # 12

Pair production is the phenomenon in which

Question # 13

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

Question # 14

The photon of radio-waves has energy of about

Question # 15

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

Question # 16

Position and momentum of a particle cannot both be measured simultaneously with perfect accuracy. This is the statement of

Question # 17

The photoelectric effect, the maximum energy of photoelectrons depends on the

Question # 18

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 # 19

The special theory of relativity is based on:

Question # 20

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

Question # 21

With the help of 50 K v electron microscope, a resolution of

Question # 22

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

Question # 23

the symbol to be used in relativity problems denotes:

Question # 24

The emission of electrons from a metal surface when exposed to light of suitable frequency is called the

Question # 25

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

Question # 26

The energy of photon 'E' is proported to

Question # 27

The energy of the 4th orbit in hydrogen atom is

Question # 28

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

Question # 29

There is certain frequency below which no electrons are emitted from the metal surface, this frequency is known as

Question # 30

The positron was discovered by:

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 The positron was discovered by:
A. In cosmic radiation
B. In 1932
C. By Carl Anderson
D. All above
2 de-Broglies hypthesis was experimentally verified by
A. Maxwell
B. Compton
C. Einstein
D. Davison and Germer
3 The threshold frequency of sodium is 6 x 106MHz. The cut-off wavelength for this metal will be
A. 500 m
B. 500 nm
C. 500 km
D. 500 cm
4 0.1 kg mass will be equivalent to the energy
A. 9 x 1015J
B. 5 x 108J
C. 6 x 1016J
D. 9 x 10-16J
5 The nature of radiations emitted by a hot body depends upon its:
A. Metarial
B. Temperature
C. colour
D. Volume
6 In the compton's effect, it is found that the wavelength of incident x-rays is
A. greater than the wavelength of scattered x-rays
B. equal to the wavelength of scattered x-rays
C. less than the wavelength of scattered x-rays
D. any one of these
7 At the temperature, a body emits radiation which is principally
A. of long wavelengths in the visible region
B. of long wavelengths in the invisible infrared region
C. of short wavelength in invisible ultraviolet region
D. none of these
8 Practically the quantity v/c is always:
A. less than one
B. Equal to one
C. Greater then one
D. all of these
9 Max plank received the Nobel Prize in physics for his discovery of energy quanta in
A. 1900
B. 1906
C. 1912
D. 1918
10 There is certain frequency below which no electrons are emitted from the metal surface, this frequency is known as
A. maximum frequency
B. minimum frequency
C. threshold frequency
D. all of these

Test Questions