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 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
2	Momentum is a parameter associated with	A. wave motion B. particle motion C. neither wave nor particle motion D. none of these
3	the dilation of time applies to the timing processes which are:	A. Physical B. Chemical C. Biological D. All of these
4	According to Einstein, with the great increase in the speed of the body, the relativistic mass of the body	A. Remains constant B. Decreases C. Increases to infinity D. Reduced to zero
5	Strictly speaking, the earth is:	A. An accelerated frame of reference B. A non-inertial frame of reference C. An inertial frame of reference D. ^{A non-accelerated frame of reference}
6	Wien's constant is measured in:	A. Metre per kelviin B. Metre kelvin C. Kelvin per meter D. Joules
7	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
8	The intensity of emitted energy (with wavelength) radiated from a black body at different temperatures was initially measured by:	A. Lummer B. Planck C. Pringsheim D. Both (A ) and (B)
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	The emission of electrons from a metal surface when exposed to light of suitable frequency is called the	A. pair production B. Compton effect C. photoelectric effect D. relativity

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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 nature of radiations emitted by a hot body depends upon its:

The concept of direction is purely:

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

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

Which of the following phenomenon proves the particle nature of light

According to the special theory of relativity, a moving clock

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

Davision and Germer performed experiment to verify

The existence of position was predicted by Dirace in

Intensity of light determines the:

The energy of a photon in a beam of infrared radiation of wavelength 1240 nm is

S.I. unit of planks constant is

A particle of mass 5.0 mg moves with a speed of 8.0 m/s. Its de-Brogile wavelength is

An intertial frame of reference is a frame of reference which is

The inside cavity of the black body is

With the help of 50 K v electron microscope, a resolution of

Photoelectric effect takes place with a photon of:

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:

The threshold frequency of sodium is 6 x 106MHz. The cut-off wavelength for this metal will be

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

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

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

According to the special theory of relativity, time is

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

Victor de-Brogile received the Nobel prize in physics in

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

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

Compton was awarded Nobel prize in physics in

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

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ECAT Physics Chapter 19 Important MCQ's

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The threshold frequency of sodium is 6 x 10⁶MHz. The cut-off wavelength for this metal will be