Physics ECAT Pre Engineering Chapter 19 Dawn of Modern Physics

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

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Question # 1

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

Question # 2

If a material object moves with the speed of light 'C' its mass becomes

Question # 3

From the theory of relativity, momentum p of the photon is related to energy as

Question # 4

The energy of a photon is represented by

Question # 5

Strictly speaking, the earth is:

Question # 6

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

Question # 7

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

Question # 8

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

Question # 9

The unit of work function is:

Question # 10

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

Question # 11

Newton's law of motion do not hold in

Question # 12

In process of annihilation of matter, the two photons produced move in opposite direction to converse

Question # 13

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

Question # 14

A particle having mass and charge equal to that of an electron is called:

Question # 15

The special theory of relativity treats problems invoving

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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 According to Einstein, with the great increase in the speed of the body, the relativistic mass of the body
A. Remains constant
B. Decreases
C. Increases to infinity
D. Reduced to zero
3 The threshold frequency of sodium is 6 x 106MHz. The cut-off wavelength for this metal will be
A. 500 m
B. 500 nm
C. 500 km
D. 500 cm
4 Which of the following phenomenon proves the particle nature of light
A. interference
B. diffraction
C. photoelectric effect
D. none of these
5 When a high energy photon interact with a metal, which of the following effect is most likely to be taken place
A. pair production
B. photoelectric effect
C. Compton effect
D. None of these
6 Strictly speaking, the earth is:
A. An accelerated frame of reference
B. A non-inertial frame of reference
C. An inertial frame of reference
D. A non-accelerated frame of reference
7 Converse of pair production is known as
A. Compton effect
B. annihilation of matter
C. photoelectric effect
D. none of these
8 The way through which electromagnetic radiations or photons interact with matter depends upon their:
A. Wavelength
B. Frequency
C. Energy
D. Temperature
9 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
10 The Nobel Prize on the explanation of photoelectric effect was awarded to:
A. Max. Planck
B. Maxwell
C. Bohr
D. Rutherford

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