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 energy of a photon in a beam of infrared radiation of wavelength 1240 nm is	A. 100 ev B. 10⁶e v C. 10³e v D. 1.0 e v
2	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
3	When platinum wire is heated, it appears cherry red at	A. 1600°C B. 900°C C. 1100°C D. 1300°C
4	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
5	Albert Einstein got the Nobel prize in physics for his explanation of photoelectric effect in	A. 1916 B. 1919 C. 1921 D. 1923
6	From the theory of relativity, momentum p of the photon is related to energy as	A. p = hfc B. p = hf/c C. p = f(hc,f) D. p = cf/h
7	The concept of direction is purely:	A. Absolute B. Relative C. Relative to stars always D. Relative to the sun always
8	Electromagnetic radiation or photons interact with matter in	A. two distinct ways B. three distinct ways C. four distinct ways D. five distinct ways
9	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
10	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:	A. Smaller B. Lerger C. Same D. Much larger

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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

Photoelectrons are emitted when ultraviolet light falls on:

When a platinum wire is heated, it appears yellow at

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

The special theory of relativity is based on:

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

The value of the Stephen's constant for black body radiations is given by

An inertial frame is that frame in which

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

Converse of pair production is known as

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

Momentum is a parameter associated with

A photon is considered to have

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

There is no way to detect:

The special theory of relatively treats the problems involving:

The existence of position was predicted by Dirace in

When a platinum wire is heated, it appears white at

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

Which of the following phenomenon proves the particle nature of light

0.1 kg mass will be equivalent to the energy

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

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

In photoelectric effect the energy of ejected electrons depend on

Compton derived an expression to find compton shift by applying to the process, the law of conservation of:

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

The Nobel Prize on the explanation of photoelectric effect was awarded to:

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

Victor de-Brogile received the Nobel prize in physics in

The length contraction happens only

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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

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