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

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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 value of the Stephen's constant for black body radiations is given by	A. 5.6 x 10⁸Wm^-2K^-4 B. 5.67 x 10^-8Wm^-2K^-4 C. 2.9 x 10^-3mK D. 2.9 x 10³mK
2	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
3	When a platinum wire is heated, it appears dull red at about	A. 500°C B. 900°C C. 1100°C D. 1300°C
4	The way through which electromagnetic radiations or photons interact with matter depends upon their:	A. Wavelength B. Frequency C. Energy D. Temperature
5	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:	A. Smaller B. Lerger C. Same D. Much larger
6	Compton studied the scattering of x-rays by loosely bound electrons from:	A. NaCl crystal B. Graphite crystal C. Zirconia D. Copper crystal
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 ratio of energy E to the corresponding frequency (f) of the radiation (emitted or absorbed) is called:	A. Wien's constant B. Stefen's constnat C. Planck's constant D. Boltzmann's constant
9	the dilation of time applies to the timing processes which are:	A. Physical B. Chemical C. Biological D. All of these
10	The nature of radiations emitted by a hot body depends upon its:	A. Metarial B. Temperature C. colour D. Volume

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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

There is certain frequency below which no electrons are emitted from the metal surface, this frequency is known as

The positron was discovered by:

The Nobel Prize on the explanation of photoelectric effect was awarded to:

The ratio of energy E to the corresponding frequency (f) of the radiation (emitted or absorbed) is called:

The location and speed anywhere on earth can now be determined using relativistic effects by NAVISTAR to an accuracy of

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

The value of threshold frequency for different metals is

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

Victor de-Brogile received the Nobel prize in physics in

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

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

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

According to the special theory of relativity, a moving clock

the symbol to be used in relativity problems denotes:

If you are moving at relativistic speed between two points that are a fixed distance apart, then the distance between the two points appers

Wave nature of particle was proposed by

According to the special theory of relativity, time is

Photoelectrons are emitted when ultraviolet light falls on:

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

Strictly speaking, the earth is:

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

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

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

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

Which one of the following physical quantities changes with relativistic speed

Wien's constant is measured in:

The special theory of relativity is based on:

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

When a position comes close to an electron they annihilate into

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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

Test Questions

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