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 Stephen-Boltzmann law for the black body radiation is given by	A. E = T² B. E = -T² C. E = T⁴ D. E = -T⁴
2	The year when A.H. compton was awarded Nobel Prize is:	A. 1923 B. 1927 C. 1931 D. 1935
3	The ratio of energy E to the corresponding frequency (f) of the radiation (emitted or absorbed) is called:	A. Wien's constant B. Stefen's constnat C. Planck's constant D. Boltzmann's constant
4	The positron was discovered by:	A. In cosmic radiation B. In 1932 C. By Carl Anderson D. All above
5	In order to produce pair production, a photon must have a energy	A. 0.511 Me v B. 0.256 Me v C. 1.02 Me v D. 0.956 Me v
6	Practically the quantity v/c is always:	A. less than one B. Equal to one C. Greater then one D. all of these
7	Victor de-Brogile received the Nobel prize in physics in	A. 1925 B. 1929 C. 1932 D. 1935
8	According to the electromagnetic wave theory of light, increasing the intensity of incident light should increase the	A. number of photoelectrons B. size of the photoelectrons C. charge on photoelectrons D. K.E of photoelectrons
9	Photoelectric effect takes place with a photon of:	A. Very high energy B. Very low energy C. Low energy D. High energy
10	The length contraction happens only	A. Opposite to the direction of motion B. along the direction of motion C. perpendicular to the direction of motion D. In any direction

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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

Compton shift refers to:

The energy of photon 'E' is proported to

A photon is considered to have

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:

In photoelectric effect the energy of ejected electrons depend on

The mass of an object will be doubled at speed

When a platinum wire is heated, it appears white at

An inertial frame is that frame in which

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

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

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

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

With the help of 50 K v electron microscope, a resolution of

Momentum is a parameter associated with

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

Compton was awarded Nobel prize in physics in

Victor de-Brogile received the Nobel prize in physics in

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

The value of threshold frequency for different metals is

The energy of a photon is represented by

Albert Einstein got the Nobel prize in physics for his explanation of photoelectric effect in

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

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

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

When the atomic particle are moving with velocities approaching that of light:

The energy of the 4th orbit in hydrogen atom is

The positron was discovered by:

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

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

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