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	Converse of pair production is known as	A. Compton effect B. annihilation of matter C. photoelectric effect D. none of these
2	Position and momentum of a particle cannot both be measured simultaneously with perfect accuracy. This is the statement of	A. photoelectric effect B. pair production C. Compton effect D. uncertainty principle
3	The photon of radio-waves has energy of about	A. 1 Me V B. 1 Ke v C. 10^-10e v D. 10¹⁰e v
4	As the light shines on the metal surface, the electrons are ejected	A. slowly B. instantaneously C. either of these D. none of these
5	The nature of radiations emitted by a hot body depends upon its:	A. Metarial B. Temperature C. colour D. Volume
6	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
7	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
8	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
9	If a body reaches a speed equal to the speed of light, then its mass will became	A. zero B. very small C. infinity D. none of these
10	G.P. Thomson observer experimentally that electrons and neutrons possess	A. particle-like properties B. wave-like properties C. neither particle nor wave like properties 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

Position was discovered by Carl Anderson in

The concept of direction and position are purely

The existence of position was predicted by Dirace in

In photoelectric effect the energy of ejected electrons depend on

The energy of photon 'E' is proported to

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

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

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

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

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

Electromagnetic -radiation means:

A black body is

The general theory of relativity treats problems involving

Which of the following is not an example of intertial frame

The unit of work function is:

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

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

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

A non-inertial frame of reference is one, in which

Converse of pair production is known as

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

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

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

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

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 symbol to be used in relativity problems denotes:

The special theory of relativity is based on the

Electromagnetic radiation or photons interact with matter in

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

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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