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

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

Question # 2

The intensity of emitted energy (with wavelength) radiated from a black body at different temperatures was initially measured by:

Question # 3

The way through which electromagnetic radiations or photons interact with matter depends upon their:

Question # 4

Photoelectrons are emitted when ultraviolet light falls on:

Question # 5

Which of the following is not an example of intertial frame

Question # 6

Position was discovered by Carl Anderson in

Question # 7

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

Question # 8

The energy of photon 'E' is proported to

Question # 9

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

Question # 10

At the temperature, a body emits radiation which is principally

Question # 11

Pair production is the phenomenon in which

Question # 12

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

Question # 13

The special theory of relatively treats the problems involving:

Question # 14

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

Question # 15

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

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ECAT Physics Chapter 19 Important MCQ's

Sr.# Question Answer
1 The existence of position was predicted by Dirace in
A. 1920
B. 1925
C. 1930
D. 1928
2 As the light shines on the metal surface, the electrons are ejected
A. slowly
B. instantaneously
C. either of these
D. none of these
3 Photoelectric effect takes place with a photon of:
A. Very high energy
B. Very low energy
C. Low energy
D. High energy
4 There is certain frequency below which no electrons are emitted from the metal surface, this frequency is known as
A. maximum frequency
B. minimum frequency
C. threshold frequency
D. all of these
5 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
6 the dilation of time applies to the timing processes which are:
A. Physical
B. Chemical
C. Biological
D. All of these
7 The emission of electrons from a metal surface when exposed to light of suitable frequency is called the
A. pair production
B. Compton effect
C. photoelectric effect
D. relativity
8 The energy of a photon in a beam of infrared radiation of wavelength 1240 nm is
A. 100 ev
B. 106e v
C. 103e v
D. 1.0 e v
9 Pair production is the phenomenon in which
A. matter is converted into energy
B. energy is converted into matter
C. light is converted into electrical energy
D. electrical energy is converted into light
10 When a platinum wire is heated, it appears white at
A. 1600°C
B. 900°C
C. 1100°C
D. 1300°C

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  • hasnain

    hasnain

    30 May 2018

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