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

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

Question # 2

S.I. unit of planks constant is

Question # 3

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

Question # 4

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

Question # 5

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

Question # 6

The idea of quantization of energy was proposed by:

Question # 7

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

Question # 8

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

Question # 9

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

Question # 10

When a platinum wire is heated, it appears dull red at about

Question # 11

Due to relative motion of observer and the frame of reference of events, time always:

Question # 12

The energy of the 4th orbit in hydrogen atom is

Question # 13

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

Question # 14

An inertial frame is that frame in which

Question # 15

A non-inertial frame of reference is one, in which

Question # 16

The special theory of relativity is based on:

Question # 17

The concept of direction and position are purely

Question # 18

According to the special theory of relativity, a moving clock

Question # 19

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

Question # 20

The special theory of relativity is based on the

Question # 21

According to the special theory of relativity

Question # 22

Wave nature of particle was proposed by

Question # 23

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

Question # 24

Converse of pair production is known as

Question # 25

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

Question # 26

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

Question # 27

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

Question # 28

The stopping voltage for a certain metal is 100 volts, then the work function for the cathode plate is

Question # 29

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

Question # 30

Albert Einstein got the Nobel prize in physics for his explanation of photoelectric effect in

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 A black body is
A. an ideal absorber
B. an ideal radiator
C. both of them
D. none of them
2 When platinum wire is heated, it appears cherry red at
A. 1600°C
B. 900°C
C. 1100°C
D. 1300°C
3 As the light shines on the metal surface, the electrons are ejected
A. slowly
B. instantaneously
C. either of these
D. none of these
4 If a material object moves with the speed of light 'C' its mass becomes
A. Equal to its rest mass
B. Four times of its rest mass
C. Double of its rest mass
D. Infinite
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 Intensity of light determines the:
A. Energy of each photon
B. Number of photons
C. Speed of photons
D. Size of photons
7 When a platinum wire is heated, it appears white at
A. 1600°C
B. 900°C
C. 1100°C
D. 1300°C
8 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
9 The special theory of relativity is based on the
A. one postulate
B. two postulates
C. three postulates
D. four postulates
10 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

Test Questions

Is this page helpful?