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 special theory of relativity is based on:

Question # 2

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

Question # 3

A high temperature, the proportion of shorter wavelengths radiation, emitted by the body

Question # 4

Which one of the following physical quantities changes with relativistic speed

Question # 5

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 # 6

In the compton's effect, it is found that the wavelength of incident x-rays is

Question # 7

At the temperature, a body emits radiation which is principally

Question # 8

The special theory of relativity is based on the

Question # 9

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

Question # 10

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

Question # 11

The speed of a pendulum is measured to be 3.0 s in the inertial reference frame of the pendulum. What is its period measured by an observer moving at a speed of 0.95 c with respect to the pendulum

Question # 12

Photoelectric effect takes place with a photon of:

Question # 13

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

Question # 14

The concept of direction is purely:

Question # 15

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

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ECAT Physics Chapter 19 Important MCQ's

Sr.# Question Answer
1 According to the special theory of relativity, time is
A. absolute quantity
B. not absolute quantity
C. constant quantity
D. none of these
2 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
3 An inertial frame is that frame in which
A. a>0
B. a=0
C. a<0
D. none of these
4 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
5 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
6 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
7 The existence of position was predicted by Dirace in
A. 1920
B. 1925
C. 1930
D. 1928
8 The inside cavity of the black body is
A. painted white
B. painted silver
C. blackened with soot
D. painted red
9 Which one of the following physical quantities changes with relativistic speed
A. Length
B. Mass
C. Time
D. All of the above
10 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

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