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	When a platinum wire is heated, it appears yellow at	A. 1600°C B. 900°C C. 1100°C D. 1300°C
2	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
3	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
4	Practically the quantity v/c is always:	A. less than one B. Equal to one C. Greater then one D. all of these
5	The year when A.H. compton was awarded Nobel Prize is:	A. 1923 B. 1927 C. 1931 D. 1935
6	When a platinum wire is heated, it appears orange red at	A. 500°C B. 900°C C. 1100°C D. 1300°C
7	There is no way to detect:	A. Absolute uniform motion B. Accelerated motion C. State rest D. State of motion
8	According to the special theory of relativity, time is	A. absolute quantity B. not absolute quantity C. constant quantity D. none of these
9	Compton was awarded Nobel prize in physics in	A. 1921 B. 1923 C. 1925 D. 1927
10	With the help of 50 K v electron microscope, a resolution of	A. 0.5 to 1 m to possible B. 1 m to 10 m is possible C. 0.5 to 1 nm is possible D. 1 to 10 nm is possible

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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

Compton derived an expression to find compton shift by applying to the process, the law of conservation of:

According to Einstein, with the great increase in the speed of the body the relativistic length of the body

Electromagnetic -radiation means:

The positron was discovered by:

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

Absolute motion cannot be detected

The special theory of relativity is based on:

Converse of pair production is known as

Davision and Germer performed experiment to verify

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

The photon of radio-waves has energy of about

The energy of a photon is represented by

The special theory of relativity treats problems invoving

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

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

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

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

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

The idea of quantization of energy was proposed by:

0.1 kg mass will be equivalent to the energy

Pair production is the phenomenon in which

Which one of the following physical quantities changes with relativistic speed

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

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:

Photoelectrons are emitted when ultraviolet light falls on:

Photocell is a device which converts

When a platinum wire is heated, it appears orange red at

The whole shape of the black body spectrum for all wavelengths was explained by the formula proposed by

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

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

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ECAT Physics Chapter 19 Important MCQ's

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