ECAT Pre Computer Science Chapter 19 MCQ Test With Answer

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

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

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ECAT Physics Chapter 19 Dawn of Modern Physics

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Question # 1

The photon of radio-waves has energy of about

Question # 2

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

Question # 3

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

Question # 4

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

Question # 5

The idea of quantization of energy was proposed by:

Question # 6

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

Question # 7

the symbol to be used in relativity problems denotes:

Question # 8

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

Question # 9

Absolute motion cannot be detected

Question # 10

There is no way to detect:

Question # 11

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

Question # 12

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

Question # 13

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

Question # 14

When a position comes close to an electron they annihilate into photons such that

Question # 15

Davision and Germer performed experiment to verify

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ECAT Physics Chapter 19 Important MCQ's

Sr.# Question Answer
1 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
2 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
3 The ratio of energy E to the corresponding frequency (f) of the radiation (emitted or absorbed) is called:
A. Wien's constant
B. Stefen's constnat
C. Planck's constant
D. Boltzmann's constant
4 If you are moving at relativistic speed between two points that are a fixed distance apart, then the distance between the two points appers
A. larger
B. shorter
C. equal
D. none of these
5 Which one of the following physical quantities changes with relativistic speed
A. Length
B. Mass
C. Time
D. All of the above
6 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
7 S.I. unit of planks constant is
A. J-s-1
B. J.s
C. J.s-2
D. J.s2
8 The way through which electromagnetic radiations or photons interact with matter depends upon their:
A. Wavelength
B. Frequency
C. Energy
D. Temperature
9 Compton shift refers to:
A. Photon
B. Meson
C. Proton
D. Positron
10 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

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