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 year when A.H. compton was awarded Nobel Prize is:	A. 1923 B. 1927 C. 1931 D. 1935
2	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
3	Max plank received the Nobel Prize in physics for his discovery of energy quanta in	A. 1900 B. 1906 C. 1912 D. 1918
4	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
5	If you are moving at relativistic speed between two points that are a fixed distance apart, then the distance between the two points appers	A. larger B. shorter C. equal D. none of these
6	The value of threshold frequency for different metals is	A. different B. same C. may be different or may be same D. none of these
7	There is no way to detect:	A. Absolute uniform motion B. Accelerated motion C. State rest D. State of motion
8	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
9	An inertial frame is that frame in which	A. a>0 B. a=0 C. a<0 D. none of these
10	The concept of direction is purely:	A. Absolute B. Relative C. Relative to stars always D. Relative to the sun always

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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

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

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

Photoelectrons are emitted when ultraviolet light falls on:

Photoelectric effect takes place with a photon of:

The length contraction happens only

Wave nature of particle was proposed by

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

Compton was awarded Nobel prize in physics in

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

S.I. unit of planks constant is

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

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

Strictly speaking, the earth is:

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

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

An inertial frame is that frame in which

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

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

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

Intensity of light determines the:

The stopping voltage for a certain metal is 100 volts, then the work function for the cathode plate is

The threshold frequency of sodium is 6 x 106MHz. The cut-off wavelength for this metal will be

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

The mass of an object will be doubled at speed

A photon is considered to have

Photocell is a device which converts

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

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

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

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

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ECAT Physics Chapter 19 Important MCQ's

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The threshold frequency of sodium is 6 x 10⁶MHz. The cut-off wavelength for this metal will be