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

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

Question # 2

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

Question # 3

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

Question # 4

the symbol to be used in relativity problems denotes:

Question # 5

According to the Max plank, energy is redialed or absorbed in

Question # 6

When a high energy photon interact with a metal, which of the following effect is most likely to be taken place

Question # 7

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

Question # 8

The threshold frequency of sodium is 6 x 106MHz. The cut-off wavelength for this metal will be

Question # 9

When a platinum wire is heated, it appears dull red at about

Question # 10

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

Question # 11

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

Question # 12

As compared to the distance measured by an observer on Earth, the distance from Earth to a star measured by an observer in a moving spaceship would seem:

Question # 13

The positron was discovered by:

Question # 14

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

Question # 15

The length contraction happens only

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ECAT Physics Chapter 19 Important MCQ's

Sr.# Question Answer
1 Current, voltage, resistance measuring circuit is connected with the galvanometer with the help of switch, known as
A. ON switch
B. off switch
C. function switch
D. none of these
2 The special theory of relatively treats the problems involving:
A. Inertial frames of reference
B. Non-inertial frames
C. Non-accelerated frame
D. Botha (A) and (C)
3 The value of the Stephen's constant for black body radiations is given by
A. 5.6 x 108Wm-2K-4
B. 5.67 x 10-8Wm-2K-4
C. 2.9 x 10-3mK
D. 2.9 x 103mK
4 Wien's constant is measured in:
A. Metre per kelviin
B. Metre kelvin
C. Kelvin per meter
D. Joules
5 Which of the following is not an example of intertial frame
A. a body placed on the surface of earth
B. a body placed in a car moving with uniform velocity
C. a body placed in a car moving with same acceleration
D. none of these
6 Due to relative motion of observer and the frame of reference of events, time always:
A. Dilates itself
B. Contracts itself
C. Stretches itself
D. Both (A) and (C)
7 The Nobel Prize on the explanation of photoelectric effect was awarded to:
A. Max. Planck
B. Maxwell
C. Bohr
D. Rutherford
8 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
9 An inertial frame is that frame in which
A. a>0
B. a=0
C. a<0
D. none of these
10 The positron was discovered by:
A. In cosmic radiation
B. In 1932
C. By Carl Anderson
D. All above

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