ECAT Pre Engineering Physics Chapter 19 MCQ Test With Answer

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

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

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Physics ECAT Pre Engineering Chapter 19 Dawn of Modern Physics

00:00
Question # 1

The energy of a photon in a beam of infrared radiation of wavelength 1240 nm is

Question # 2

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

Question # 3

As the light shines on the metal surface, the electrons are ejected

Question # 4

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

Question # 5

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

Question # 6

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

Question # 7

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

Question # 8

Victor de-Brogile received the Nobel prize in physics in

Question # 9

When platinum wire is heated, it appears cherry red at

Question # 10

The special theory of relativity is based on the

Question # 11

Compton was awarded Nobel prize in physics in

Question # 12

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

Question # 13

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

Question # 14

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

Question # 15

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

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ECAT Physics Chapter 19 Important MCQ's

Sr.# Question Answer
1 According to Einstein, with the great increase in the speed of the body the relativistic length of the body
A. Remains constant
B. Decreases
C. Increases
D. Reduces to zero
2 An electron is accelerated through a potential difference of 50v. its de-Brogile wavelength is
A. 1.66 x 10-29m
B. 1.74 x 10-10cm
C. 17.4 x 10-6m
D. 1.74 x 10-10m
3 The location and speed anywhere on earth can now be determined using relativistic effects by NAVISTAR to an accuracy of
A. 2 cm/s
B. 20 cm/s
C. 200 cm/s
D. 2000 cm/s
4 When platinum wire is heated, then at the temperature of 500 oC, it becomes:
A. Yellow
B. Orange red
C. Dull red
D. White
5 A photon is considered to have
A. Momentum
B. Energy
C. Wavelength
D. All of the above
6 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
A. 1.66 m
B. 1.0 m
C. 0.66 m
D. 2.66 m
7 When the atomic particle are moving with velocities approaching that of light:
A. Newton's laws become valid
B. Relativistic effects become prominent
C. Botha(A) and (B) are valid
D. Neither (A)nor (B)
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 energy of photon 'E' is proported to
A. The magnetic field H
B. The electric field E
C. Both the electric and magnetic field H and E
D. Frequency
10 Which of the following phenomenon proves the particle nature of light
A. interference
B. diffraction
C. photoelectric effect
D. none of these

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    hasnain

    30 May 2018

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