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

the dilation of time applies to the timing processes which are:

Question # 2

The idea of quantization of energy was proposed by:

Question # 3

The special theory of relativity is based on the

Question # 4

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

Question # 5

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

Question # 6

According to the special theory of relativity, time is

Question # 7

the symbol to be used in relativity problems denotes:

Question # 8

There is no way to detect:

Question # 9

If the radius of first orbit of hydrogen atom is 0.53° A the radius of second orbit will be

Question # 10

Intensity of light determines the:

Question # 11

A black body is

Question # 12

Compton shift refers to:

Question # 13

Wave nature of particle was proposed by

Question # 14

Compton was awarded Nobel prize in physics in

Question # 15

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

Question # 16

The value of threshold frequency for different metals is

Question # 17

Momentum is a parameter associated with

Question # 18

When monochromatic light is allowed to fall on cathode, it begins to emit electrons, these electrons are called

Question # 19

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

Question # 20

The whole shape of the black body spectrum for all wavelengths was explained by the formula proposed by

Question # 21

When a position comes close to an electron they annihilate into

Question # 22

The unit of work function is:

Question # 23

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

Question # 24

The mass of an object will be doubled at speed

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

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

Question # 27

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

Question # 28

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

Question # 29

In photoelectric effect the energy of ejected electrons depend on

Question # 30

According to Einstein, with the great increase in the speed of the body the relativistic length of the body

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 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
2 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
3 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
4 In photoelectric effect the energy of ejected electrons depend on
A. The frequency
B. The intensity
C. Both frequency and intensity
D. None of these
5 With the help of 50 K v electron microscope, a resolution of
A. 0.5 to 1 m to possible
B. 1 m to 10 m is possible
C. 0.5 to 1 nm is possible
D. 1 to 10 nm is possible
6 An intertial frame of reference is a frame of reference which is
A. at rest
B. moving with uniform velocity
C. either at rest or moving with uniform velocity
D. none of these
7 The whole shape of the black body spectrum for all wavelengths was explained by the formula proposed by
A. Max plank
B. Newton
C. Einstein
D. J.J. Thomson
8 The value of threshold frequency for different metals is
A. different
B. same
C. may be different or may be same
D. none of these
9 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
10 The length contraction happens only
A. Opposite to the direction of motion
B. along the direction of motion
C. perpendicular to the direction of motion
D. In any direction

Test Questions