ECAT Pre General Science Chapter 19 online mcq test with answers for Physics chapter 19 (Dawn of Modern Physics)

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ECAT Physics Chapter 19 Important MCQ's

Sr.#	Question	Answer
1	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
2	Max Planck received the Nobel Prize for his discovery of energy quants in:	A. 1718 AD B. 1918 AH C. 1818 AD D. 1918 AD
3	Practically the quantity v/c is always:	A. less than one B. Equal to one C. Greater then one D. all of these
4	Compton studied the scattering of x-rays by loosely bound electrons from:	A. NaCl crystal B. Graphite crystal C. Zirconia D. Copper crystal
5	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
6	The positron was discovered by:	A. In cosmic radiation B. In 1932 C. By Carl Anderson D. All above
7	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
8	With the help of 50 K v electron microscope, a resolution of	A. 0.5 to 1 m to possible B. 1 m to 10 m is possible C. 0.5 to 1 nm is possible D. 1 to 10 nm is possible
9	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
10	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

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ECAT Pre General Science Physics Chapter 19 MCQ Test With Answer

MCQ's Test For ECAT Pre General Science Physics Chapter 19 Dawn of Modern Physics

ECAT Pre General Science Physics Chapter 19 Dawn of Modern Physics

According to the special theory of relativity, a moving clock

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

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

When the atomic particle are moving with velocities approaching that of light:

Max plank received the Nobel Prize in physics for his discovery of energy quanta in

The emission of electrons from a metal surface when exposed to light of suitable frequency is called the

The special theory of relatively treats the problems involving:

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

Practically the quantity v/c is always:

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

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

Which one of the following physical quantities changes with relativistic speed

There is no way to detect:

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

Compton was awarded Nobel prize in physics in

The unit of work function is:

The special theory of relativity is based on the

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

the symbol to be used in relativity problems denotes:

The inside cavity of the black body is

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

The analysis of the distribution of wavelengths of the radiation emitted from a hot body set the foundation of new mechanics, known as

The idea of quantization of energy was proposed by:

The photon of radio-waves has energy of about

0.1 kg mass will be equivalent to the energy

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

Electromagnetic -radiation means:

Wien's constant is measured in:

The Nobel Prize on the explanation of photoelectric effect was awarded to:

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

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