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

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Question # 1

If a body reaches a speed equal to the speed of light, then its mass will became

Question # 2

Which of the following phenomenon proves the particle nature of light

Question # 3

The unit of work function is:

Question # 4

There is certain frequency below which no electrons are emitted from the metal surface, this frequency is known as

Question # 5

The Einstein's changes in length, mass and time are not observed in common life because

Question # 6

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

Question # 7

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

Question # 8

de-Broglies hypthesis was experimentally verified by

Question # 9

An inertial frame is that frame in which

Question # 10

The special theory of relatively treats the problems involving:

Question # 11

The concept of direction is purely:

Question # 12

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

Question # 13

The existence of position was predicted by Dirace in

Question # 14

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

Question # 15

The photon of radio-waves has energy of about

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ECAT Physics Chapter 19 Important MCQ's

Sr.# Question Answer
1 According to the de-Brogile relation, an object of large mass and ordinary speed has
A. very small wavelength
B. very large wavelength
C. very small frequency
D. all of these
2 If the radius of first orbit of hydrogen atom is 0.53° A the radius of second orbit will be
A. 2.120°A
B. 0.212°A
C. 21.2°A
D. 0.14°
a
3 According to the special theory of relativity, a moving clock
A. runs faster
B. runs slower
C. neither runs faster nor slower
D. all of these
4 A high temperature, the proportion of shorter wavelengths radiation, emitted by the body
A. decreases
B. first increases then decreases
C. increases
D. any one of them
5 The Nobel Prize on the explanation of photoelectric effect was awarded to:
A. Max. Planck
B. Maxwell
C. Bohr
D. Rutherford
6 When platinum wire is heated, then at the temperature of 500 oC, it becomes:
A. Yellow
B. Orange red
C. Dull red
D. White
7 Absolute motion cannot be detected
A. in its own frame of references
B. in a different frame of references
C. both in its frame and different frame of references
D. none of these
8 An intertial frame of reference is a frame of reference which is
A. at rest
B. moving with uniform velocity
C. either at rest or moving with uniform velocity
D. none of these
9 When monochromatic light is allowed to fall on cathode, it begins to emit electrons, these electrons are called
A. thermoionic electrons
B. free electrons
C. photoelectrons
D. slow electrons
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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