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

Pair production is the phenomenon in which

Question # 2

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

Question # 3

Photoelectrons are emitted when ultraviolet light falls on:

Question # 4

There is no way to detect:

Question # 5

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

Question # 6

A photon is considered to have

Question # 7

According to the de-Brogile relation, an object of large mass and ordinary speed has

Question # 8

The length contraction happens only

Question # 9

In photoelectric effect the energy of ejected electrons depend on

Question # 10

The general theory of relativity treats problems involving

Question # 11

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

Question # 12

When platinum wire is heated, it appears cherry red at

Question # 13

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

Question # 14

The energy of a photon is represented by

Question # 15

Compton shift refers to:

Question # 16

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

Question # 17

The positron was discovered by:

Question # 18

Position was discovered by Carl Anderson in

Question # 19

Wave nature of particle was proposed by

Question # 20

Momentum is a parameter associated with

Question # 21

The photon of radio-waves has energy of about

Question # 22

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

Question # 23

The idea of quantization of energy was proposed by:

Question # 24

When a platinum wire is heated, it appears white at

Question # 25

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

Question # 26

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

Question # 27

In order to produce pair production, a photon must have a energy

Question # 28

The special theory of relativity is based on the

Question # 29

The Nobel Prize on the explanation of photoelectric effect was awarded to:

Question # 30

The intensity of emitted energy (with wavelength) radiated from a black body at different temperatures was initially measured 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 year when A.H. compton was awarded Nobel Prize is:
A. 1923
B. 1927
C. 1931
D. 1935
2 Wien's constant is measured in:
A. Metre per kelviin
B. Metre kelvin
C. Kelvin per meter
D. Joules
3 From the theory of relativity, momentum p of the photon is related to energy as
A. p = hfc
B. p = hf/c
C. p = f(hc,f)
D. p = cf/h
4 Position was discovered by Carl Anderson in
A. 1920
B. 1925
C. 1928
D. 1932
5 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
6 If a body reaches a speed equal to the speed of light, then its mass will became
A. zero
B. very small
C. infinity
D. none of these
7 the symbol to be used in relativity problems denotes:
A. Dilated time
B. Proper time
C. Life time
D. Half time
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 According to Einstein, with the great increase in the speed of the body, the relativistic mass of the body
A. Remains constant
B. Decreases
C. Increases to infinity
D. Reduced to zero
10 The way through which electromagnetic radiations or photons interact with matter depends upon their:
A. Wavelength
B. Frequency
C. Energy
D. Temperature

Test Questions