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

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Ziyad Rehman Sheikh 16 - Nov - 2022 07 Min 21 Sec 40/120
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maha 01 - Mar - 2023 04 Min 24 Sec 35/120

ECAT Physics Chapter 19 Important MCQ's

Sr.#	Question	Answer
1	The year when A.H. compton was awarded Nobel Prize is:	A. 1923 B. 1927 C. 1931 D. 1935
2	When platinum wire is heated, then at the temperature of 500 ^oC, it becomes:	A. Yellow B. Orange red C. Dull red D. White
3	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
4	Which of the following phenomenon proves the particle nature of light	A. interference B. diffraction C. photoelectric effect 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	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
7	Compton shift refers to:	A. Photon B. Meson C. Proton D. Positron
8	When a platinum wire is heated, it appears yellow at	A. 1600°C B. 900°C C. 1100°C D. 1300°C
9	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	A. 1.66 m B. 1.0 m C. 0.66 m D. 2.66 m
10	An inertial frame is that frame in which	A. a>0 B. a=0 C. a<0 D. none of these

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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

The energy of a photon is represented by

If A represents linear momentum and c, the velocity of light, then unit of pc in international system of units is:

Electromagnetic radiation or photons interact with matter in

The concept of direction is purely:

When a platinum wire is heated, it appears yellow at

The photon of radio-waves has energy of about

When platinum wire is heated, then at the temperature of 500 oC, it becomes:

Photoelectric effect takes place with a photon of:

At the temperature, a body emits radiation which is principally

the dilation of time applies to the timing processes which are:

The length contraction happens only

The mass of an object will be doubled at speed

The existence of position was predicted by Dirace in

As the light shines on the metal surface, the electrons are ejected

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

According to the special theory of relativity, time is

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

The general theory of relativity treats problems involving

When a position comes close to an electron they annihilate into photons such that

The special theory of relativity is based on the

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

An inertial frame is that frame in which

A black body is

Compton shift refers to:

Position and momentum of a particle cannot both be measured simultaneously with perfect accuracy. This is the statement of

Photoelectrons are emitted when ultraviolet light falls on:

The Stephen-Boltzmann law for the black body radiation is given by

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

Practically the quantity v/c is always:

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

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ECAT Physics Chapter 19 Important MCQ's

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When platinum wire is heated, then at the temperature of 500 ^oC, it becomes: