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

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

Question # 2

Compton derived an expression to find compton shift by applying to the process, the law of conservation of:

Question # 3

Compton shift refers to:

Question # 4

The nature of radiations emitted by a hot body depends upon its:

Question # 5

Momentum is a parameter associated with

Question # 6

Pair production is the phenomenon in which

Question # 7

The photon of radio-waves has energy of about

Question # 8

The positron was discovered by:

Question # 9

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

Question # 10

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

Question # 11

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

Question # 12

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

Question # 13

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

Question # 14

There is no way to detect:

Question # 15

de-Broglies hypthesis was experimentally verified by

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ECAT Physics Chapter 19 Important MCQ's

Sr.# Question Answer
1 The energy of the 4th orbit in hydrogen atom is
A. 2.5 ev
B. - 3.5 ev
C. -0.85 ev
D. -13.6 ev
2 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
3 Momentum is a parameter associated with
A. wave motion
B. particle motion
C. neither wave nor particle motion
D. none of these
4 The Einstein's changes in length, mass and time are not observed in common life because
A. We dont observer then seriously
B. The masses are too large
C. Their speed is too small than the speed of right
D. All of the above
5 Electromagnetic radiation or photons interact with matter in
A. two distinct ways
B. three distinct ways
C. four distinct ways
D. five distinct ways
6 Max plank received the Nobel Prize in physics for his discovery of energy quanta in
A. 1900
B. 1906
C. 1912
D. 1918
7 According to the electromagnetic wave theory of light, increasing the intensity of incident light should increase the
A. number of photoelectrons
B. size of the photoelectrons
C. charge on photoelectrons
D. K.E of photoelectrons
8 The Nobel Prize on the explanation of photoelectric effect was awarded to:
A. Max. Planck
B. Maxwell
C. Bohr
D. Rutherford
9 Which of the following phenomenon proves the particle nature of light
A. interference
B. diffraction
C. photoelectric effect
D. none of these
10 The intensity of emitted energy (with wavelength) radiated from a black body at different temperatures was initially measured by:
A. Lummer
B. Planck
C. Pringsheim
D. Both (A ) and (B)

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