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 white at	A. 1600°C B. 900°C C. 1100°C D. 1300°C
2	As the light shines on the metal surface, the electrons are ejected	A. slowly B. instantaneously C. either of these D. none of these
3	The mass 'm' of a body moving at 0.8 c (whose rest mass is mo) becomes	A. 2 mo B. 1.67 mo C. 0.67 mo D. 2.67 mo
4	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}
5	The threshold frequency of sodium is 6 x 10⁶MHz. The cut-off wavelength for this metal will be	A. 500 m B. 500 nm C. 500 km D. 500 cm
6	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
7	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. 1.66 m B. 1.0 m C. 0.66 m D. 2.66 m
8	According to the Max plank, energy is redialed or absorbed in	A. discrete packets B. continuous waves C. either of them D. none of these
9	A high temperature, the proportion of shorter wavelengths radiation, emitted by the body	A. decreases B. first increases then decreases C. increases D. any one of them
10	Converse of pair production is known as	A. Compton effect B. annihilation of matter C. photoelectric effect 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

the symbol to be used in relativity problems denotes:

The unit of work function is:

At the temperature, a body emits radiation which is principally

Compton studied the scattering of x-rays by loosely bound electrons from:

The intensity of emitted energy (with wavelength) radiated from a black body at different temperatures was initially measured by:

Which of the following is not an example of intertial frame

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

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

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

Position and momentum of a particle cannot both be measured simultaneously with perfect accuracy. This is the statement of

Photoelectrons are emitted when ultraviolet light falls on:

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

Momentum is a parameter associated with

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

The analysis of the distribution of wavelengths of the radiation emitted from a hot body set the foundation of new mechanics, known as

Which of the following phenomenon proves the particle nature of light

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

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

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

The energy of a photon is represented by

Davision and Germer performed experiment to verify

de-Broglies hypthesis was experimentally verified by

The Einstein's changes in length, mass and time are not observed in common life because

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

Photocell is a device which converts

The energy of photon 'E' is proported to

The emission of electrons from a metal surface when exposed to light of suitable frequency is called the

Wien's constant is measured in:

A particle having mass and charge equal to that of an electron is called:

According to the special theory of relativity, time is

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ECAT Physics Chapter 19 Important MCQ's

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