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

The unit of work function is:

Question # 2

The length contraction happens only

Question # 3

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

Question # 4

The ratio of energy E to the corresponding frequency (f) of the radiation (emitted or absorbed) is called:

Question # 5

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

Question # 6

S.I. unit of planks constant is

Question # 7

Strictly speaking, the earth is:

Question # 8

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

Question # 9

According to Einstein, with the great increase in the speed of the body the relativistic length of the body

Question # 10

Current, voltage, resistance measuring circuit is connected with the galvanometer with the help of switch, known as

Question # 11

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

Question # 12

Which of the following is not an example of intertial frame

Question # 13

Max Planck received the Nobel Prize for his discovery of energy quants in:

Question # 14

In photoelectric effect the energy of ejected electrons depend on

Question # 15

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

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ECAT Physics Chapter 19 Important MCQ's

Sr.# Question Answer
1 Compton shift refers to:
A. Photon
B. Meson
C. Proton
D. Positron
2 The special theory of relativity treats problems invoving
A. inertial frame of references
B. accelerating frame of references
C. both of these
D. none of these
3 A non-inertial frame of reference is one, in which
A. law of inertial is valid
B. all laws of physics are the same in all frames
C. a>0 or a<0
D. a=0
4 The way through which electromagnetic radiations or photons interact with matter depends upon their:
A. Wavelength
B. Frequency
C. Energy
D. Temperature
5 According to the special theory of relativity
A. mass and energy are same entities
B. mass and energy are same entities but interconverible
C. mass and energy are different entities but interconverible
D. mass and energy are different entities but non-interconveritble
6 Compton derived an expression to find compton shift by applying to the process, the law of conservation of:
A. Energy only
B. Momentum only
C. Mass only
D. Charge only
7 The mass 'm' of a body moving at 0.8 c (whose rest mass is mo) becomes
A. 2 mo
B. 1.67 mo
C. 0.67 mo
D. 2.67 mo
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 Davision and Germer performed experiment to verify
A. de-Brogile hypothesis
B. theory of relativity
C. Newton's law of gravitation
D. Mass-energy relation
10 An electron is accelerated through a potential difference of 50v. its de-Brogile wavelength is
A. 1.66 x 10-29m
B. 1.74 x 10-10cm
C. 17.4 x 10-6m
D. 1.74 x 10-10m

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