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	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
2	When the atomic particle are moving with velocities approaching that of light:	A. Newton's laws become valid B. Relativistic effects become prominent C. Botha(A) and (B) are valid D. Neither (A)nor (B)
3	The general theory of relativity treats problems involving	A. inertial frame of references B. accelerating frame of references C. both of these D. none of these
4	The value of the Stephen's constant for black body radiations is given by	A. 5.6 x 10⁸Wm^-2K^-4 B. 5.67 x 10^-8Wm^-2K^-4 C. 2.9 x 10^-3mK D. 2.9 x 10³mK
5	The energy of photon 'E' is proported to	A. The magnetic field H B. The electric field E C. Both the electric and magnetic field H and E D. Frequency
6	Intensity of light determines the:	A. Energy of each photon B. Number of photons C. Speed of photons D. Size of photons
7	A non-inertial frame of reference is one, in which	A. law of inertial is valid B. all laws of physics are the same in all frames C. a>0 or a<0 D. a=0
8	Pair production is the phenomenon in which	A. matter is converted into energy B. energy is converted into matter C. light is converted into electrical energy D. electrical energy is converted into light
9	Max plank founded a mathematical model resulting in an equation that describes the shape of observed black body radiation curves exactly, in	A. 1890 B. 1895 C. 1900 D. 1905
10	Compton studied the scattering of x-rays by loosely bound electrons from:	A. NaCl crystal B. Graphite crystal C. Zirconia D. Copper crystal

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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

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

Which one of the following physical quantities changes with relativistic speed

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

A black body is

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

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

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

At the temperature, a body emits radiation which is principally

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

The way through which electromagnetic radiations or photons interact with matter depends upon their:

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

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

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

Photoelectric effect takes place with a photon of:

The energy of photon 'E' is proported to

0.1 kg mass will be equivalent to the energy

According to the special theory of relativity, time is

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

Pair production is the phenomenon in which

The idea of quantization of energy was proposed by:

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

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

Victor de-Brogile received the Nobel prize in physics 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

The inside cavity of the black body is

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

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

Newton's law of motion do not hold in

When platinum wire is heated, then at the temperature of 500 oC, it becomes:

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

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ECAT Physics Chapter 19 Important MCQ's

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When platinum wire is heated, then at the temperature of 500 ^oC, it becomes: