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	In photoelectric effect the energy of ejected electrons depend on	A. The frequency B. The intensity C. Both frequency and intensity D. None of these
3	At the temperature, a body emits radiation which is principally	A. of long wavelengths in the visible region B. of long wavelengths in the invisible infrared region C. of short wavelength in invisible ultraviolet region D. none of these
4	An electron is accelerated through a potential difference of 50v. its de-Brogile wavelength is	A. 1.66 x 10^-29m B. 1.74 x 10^-10cm C. 17.4 x 10^-6m D. 1.74 x 10^-10m
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	A black body is	A. an ideal absorber B. an ideal radiator C. both of them D. none of them
7	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}
8	The length contraction happens only	A. Opposite to the direction of motion B. along the direction of motion C. perpendicular to the direction of motion D. In any direction
9	According to Einstein, with the great increase in the speed of the body the relativistic length of the body	A. Remains constant B. Decreases C. Increases D. Reduces to zero
10	Current, voltage, resistance measuring circuit is connected with the galvanometer with the help of switch, known as	A. ON switch B. off switch C. function switch 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

Due to relative motion of observer and the frame of reference of events, time always:

Intensity of light determines the:

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

A black body is

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

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

Davision and Germer performed experiment to verify

The general theory of relativity treats problems involving

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

In process of annihilation of matter, the two photons produced move in opposite direction to converse

Max plank founded a mathematical model resulting in an equation that describes the shape of observed black body radiation curves exactly, in

Photocell is a device which converts

Which of the following phenomenon proves the particle nature of light

Newton's law of motion do not hold in

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

When a platinum wire is heated, it appears white at

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

Current, voltage, resistance measuring circuit is connected with the galvanometer with the help of switch, known as

A photon is considered to have

A high temperature, the proportion of shorter wavelengths radiation, emitted by the body

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

When monochromatic light is allowed to fall on cathode, it begins to emit electrons, these electrons are called

S.I. unit of planks constant is

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

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

The year when A.H. compton was awarded Nobel Prize is:

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

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

Electromagnetic radiation or photons interact with matter in

Electromagnetic -radiation means:

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Top Scorers Of ECAT Pre General Science Physics Chapter 19 Dawn of Modern Physics MCQ`s Test

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

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