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	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
2	The threshold frequency of sodium is 6 x 10⁶MHz. The cut-off wavelength for this metal will be	A. 500 m B. 500 nm C. 500 km D. 500 cm
3	Pair production is the phenomenon in which	A. matter is converted into energy B. energy is converted into matter C. light is converted into electrical energy D. electrical energy is converted into light
4	The analysis of the distribution of wavelengths of the radiation emitted from a hot body set the foundation of new mechanics, known as	A. classical mechanics B. Newtonian mechanics C. quantum mechanics D. statistical mechanics
5	A particle having mass and charge equal to that of an electron is called:	A. Proton B. Positron C. Pion D. Pi-meson
6	When low energy photon interact with a metal,which of the following effect is likely to be taken place	A. pair production B. photoelectric C. Compton effect D. None of these
7	When a high energy photon interact with a metal, which of the following effect is most likely to be taken place	A. pair production B. photoelectric effect C. Compton effect D. None of these
8	Absolute motion cannot be detected	A. in its own frame of references B. in a different frame of references C. both in its frame and different frame of references D. none of these
9	The energy of the 4th orbit in hydrogen atom is	A. 2.5 ev B. - 3.5 ev C. -0.85 ev D. -13.6 ev
10	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

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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 special theory of relativity treats problems invoving

When a platinum wire is heated, it appears white at

Absolute motion cannot be detected

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

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

Converse of pair production is known as

The mass of an object will be doubled at speed

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

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

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

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

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

Photocell is a device which converts

The mass 'm' of a body moving at 0.8 c (whose rest mass is mo) becomes

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

In order to produce pair production, a photon must have a energy

Momentum is a parameter associated with

Compton was awarded Nobel prize in physics in

Strictly speaking, the earth is:

According to the de-Brogile relation, an object of large mass and ordinary speed has

The value of threshold frequency for different metals is

G.P. Thomson observer experimentally that electrons and neutrons possess

Compton studied the scattering of x-rays by loosely bound electrons from:

The concept of direction is purely:

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

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

Pair production is the phenomenon in which

According to the Max plank, energy is redialed or absorbed in

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

The inside cavity of the black body is

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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: