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 whole shape of the black body spectrum for all wavelengths was explained by the formula proposed by	A. Max plank B. Newton C. Einstein D. J.J. Thomson
2	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
3	Davision and Germer performed experiment to verify	A. de-Brogile hypothesis B. theory of relativity C. Newton's law of gravitation D. Mass-energy relation
4	Which of the following is not an example of intertial frame	A. a body placed on the surface of earth B. a body placed in a car moving with uniform velocity C. a body placed in a car moving with same acceleration D. none of these
5	Compton studied the scattering of x-rays by loosely bound electrons from:	A. NaCl crystal B. Graphite crystal C. Zirconia D. Copper crystal
6	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
7	If the radius of first orbit of hydrogen atom is 0.53° A the radius of second orbit will be	A. 2.120°A B. 0.212°A C. 21.2°A D. 0.14° a
8	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
9	The stopping voltage for a certain metal is 100 volts, then the work function for the cathode plate is	A. 100 J B. 1.6 x 10^-17J C. 100 eV D. 1.6 x 10^-17eV
10	the symbol to be used in relativity problems denotes:	A. Dilated time B. Proper time C. Life time D. Half time

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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

Pair production is the phenomenon in which

The nature of radiations emitted by a hot body depends upon its:

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

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

Davision and Germer performed experiment to verify

The unit of work function is:

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

The general theory of relativity treats problems involving

There is no way to detect:

An electron is accelerated through a potential difference of 50v. its de-Brogile wavelength is

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

Max plank received the Nobel Prize in physics for his discovery of energy quanta in

The Stephen-Boltzmann law for the black body radiation is given by

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

The photon of radio-waves has energy of about

Absolute motion cannot be detected

A photon is considered to have

If A represents linear momentum and c, the velocity of light, then unit of pc in international system of units is:

When platinum wire is heated, it appears cherry red at

The concept of direction and position are purely

If a material object moves with the speed of light 'C' its mass becomes

Photocell is a device which converts

Which one of the following physical quantities changes with relativistic speed

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

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

0.1 kg mass will be equivalent to the energy

S.I. unit of planks constant is

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

The photoelectric effect, the maximum energy of photoelectrons depends on the

An inertial frame is that frame in which

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ECAT Physics Chapter 19 Important MCQ's

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