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	In order to produce pair production, a photon must have a energy	A. 0.511 Me v B. 0.256 Me v C. 1.02 Me v D. 0.956 Me v
2	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	A. 2.9 s B. 3.0 s C. 6.6 s D. 9.6 s
3	From the theory of relativity, momentum p of the photon is related to energy as	A. p = hfc B. p = hf/c C. p = f(hc,f) D. p = cf/h
4	If a body reaches a speed equal to the speed of light, then its mass will became	A. zero B. very small C. infinity D. none of these
5	When a position comes close to an electron they annihilate into	A. one photon B. two photons which travel in the same direction C. two photons which travels in the opposite direction D. two photons which travel in any direction
6	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
7	Intensity of light determines the:	A. Energy of each photon B. Number of photons C. Speed of photons D. Size of photons
8	Practically the quantity v/c is always:	A. less than one B. Equal to one C. Greater then one D. all of these
9	Which one of the following physical quantities changes with relativistic speed	A. Length B. Mass C. Time D. All of the above
10	The existence of position was predicted by Dirace in	A. 1920 B. 1925 C. 1930 D. 1928

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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

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

Strictly speaking, the earth is:

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

Photoelectric effect takes place with a photon of:

Which of the following phenomenon proves the particle nature of light

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

When a platinum wire is heated, it appears white at

Pair production is the phenomenon in which

A bar 1.0 m in length and located along x-axix moves with a speed of 0.75 c with respect to a stationary observer. The length of the bar as measured by the stationary observer is

Compton shift refers to:

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

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

The mass of an object will be doubled at speed

Photocell is a device which converts

In photoelectric effect the energy of ejected electrons depend on

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

At the temperature, a body emits radiation which is principally

The value of the Stephen's constant for black body radiations is given by

Albert Einstein got the Nobel prize in physics for his explanation of photoelectric effect in

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

Electromagnetic -radiation means:

The positron was discovered by:

Photoelectrons are emitted when ultraviolet light falls on:

Electromagnetic radiation or photons interact with matter in

The energy of photon 'E' is proported to

The value of the plank's constant 'h' is given by

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

According to the special theory of relativity, a moving clock

The unit of work function is:

The length contraction happens only

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