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 positron was discovered by:	A. In cosmic radiation B. In 1932 C. By Carl Anderson D. All above
2	The intensity of emitted energy (with wavelength) radiated from a black body at different temperatures was initially measured by:	A. Lummer B. Planck C. Pringsheim D. Both (A ) and (B)
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	In the compton's effect, it is found that the wavelength of incident x-rays is	A. greater than the wavelength of scattered x-rays B. equal to the wavelength of scattered x-rays C. less than the wavelength of scattered x-rays D. any one of these
5	The location and speed anywhere on earth can now be determined using relativistic effects by NAVISTAR to an accuracy of	A. 2 cm/s B. 20 cm/s C. 200 cm/s D. 2000 cm/s
6	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
7	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
8	There is no way to detect:	A. Absolute uniform motion B. Accelerated motion C. State rest D. State of motion
9	As the light shines on the metal surface, the electrons are ejected	A. slowly B. instantaneously C. either of these D. none of these
10	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	A. 2.9 s B. 3.0 s C. 6.6 s D. 9.6 s

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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

Electromagnetic radiation or photons interact with matter in

Strictly speaking, the earth is:

The unit of work function is:

When platinum wire is heated, it appears cherry red at

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

The inside cavity of the black body is

Photoelectrons are emitted when ultraviolet light falls on:

The special theory of relativity is based on the

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

The photon of radio-waves has energy of about

The positron was discovered by:

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

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

Davision and Germer performed experiment to verify

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

de-Broglies hypthesis was experimentally verified by

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

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 special theory of relatively treats the problems involving:

There is no way to detect:

The special theory of relativity treats problems invoving

The concept of direction is purely:

A photon is considered to have

Momentum is a parameter associated with

In photoelectric effect the energy of ejected electrons depend on

Which of the following is not an example of intertial frame

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

In process of annihilation of matter, the two photons produced move in opposite direction to converse

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

From the theory of relativity, momentum p of the photon is related to energy as

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ECAT Physics Chapter 19 Important MCQ's

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