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	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
2	Compton derived an expression to find compton shift by applying to the process, the law of conservation of:	A. Energy only B. Momentum only C. Mass only D. Charge only
3	The Stephen-Boltzmann law for the black body radiation is given by	A. E = T² B. E = -T² C. E = T⁴ D. E = -T⁴
4	The Einstein's changes in length, mass and time are not observed in common life because	A. We dont observer then seriously B. The masses are too large C. Their speed is too small than the speed of right D. All of the above
5	The photoelectric effect, the maximum energy of photoelectrons depends on the	A. particular metal surface B. frequency of incident light C. both of them D. none of them
6	Converse of pair production is known as	A. Compton effect B. annihilation of matter C. photoelectric effect D. none of these
7	Wave nature of particle was proposed by	A. Einstein B. Plank C. De-Brogile D. Max well
8	The value of threshold frequency for different metals is	A. different B. same C. may be different or may be same D. none of these
9	When a position comes close to an electron they annihilate into photons such that	A. each photon has energy 0.51 Me v B. each photon has energy 1.02 Me v C. each photon has energy 0.25 Me v D. none of these
10	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

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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 energy of the 4th orbit in hydrogen atom is

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

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

The existence of position was predicted by Dirace in

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

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

In the compton's effect, it is found that the wavelength of incident x-rays is

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

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

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

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

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

According to the special theory of relativity, time is

Victor de-Brogile received the Nobel prize in physics in

Newton's law of motion do not hold in

Photocell is a device which converts

In photoelectric effect the energy of ejected electrons depend on

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

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

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

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

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

Compton was awarded Nobel prize in physics in

The mass of an object will be doubled at speed

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

Photoelectrons are emitted when ultraviolet light falls on:

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

0.1 kg mass will be equivalent to the energy

The general theory of relativity treats problems involving

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

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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