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 concept of direction and position are purely	A. absolute B. relative C. absolute or relative D. none of these
2	According to Einstein, with the great increase in the speed of the body, the relativistic mass of the body	A. Remains constant B. Decreases C. Increases to infinity D. Reduced to zero
3	The threshold frequency of sodium is 6 x 10⁶MHz. The cut-off wavelength for this metal will be	A. 500 m B. 500 nm C. 500 km D. 500 cm
4	Which of the following phenomenon proves the particle nature of light	A. interference B. diffraction C. photoelectric effect D. none of these
5	The mass of an object will be doubled at speed	A. 1.6 x 10⁸ms^-1 B. 2.6 X 10⁸ms^-1 C. 2.6 x 10⁷ms^-1 D. 2.6 x 10⁹ms^-1
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	Position and momentum of a particle cannot both be measured simultaneously with perfect accuracy. This is the statement of	A. photoelectric effect B. pair production C. Compton effect D. uncertainty principle
8	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
9	The value of the plank's constant 'h' is given by	A. 1.6 x 10^-19J B. 1.67 x 10^-27Kg C. 6.63 x 10³⁴Js D. 6.63 x 10^-34Js
10	The photon of radio-waves has energy of about	A. 1 Me V B. 1 Ke v C. 10^-10e v D. 10¹⁰e v

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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

The concept of direction and position are purely

Victor de-Brogile received the Nobel prize in physics in

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

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

Converse of pair production is known as

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

When monochromatic light is allowed to fall on cathode, it begins to emit electrons, these electrons are called

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 non-inertial frame of reference is one, in which

Davision and Germer performed experiment to verify

Which of the following is not an example of intertial frame

The energy of a photon is represented by

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

the symbol to be used in relativity problems denotes:

The length contraction happens only

The existence of position was predicted by Dirace in

Pair production is the phenomenon in which

In photoelectric effect the energy of ejected electrons depend on

According to the special theory of relativity, a moving clock

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

Position was discovered by Carl Anderson in

The special theory of relatively treats the problems involving:

0.1 kg mass will be equivalent to the energy

At the temperature, a body emits radiation which is principally

Practically the quantity v/c is always:

G.P. Thomson observer experimentally that electrons and neutrons possess

The year when A.H. compton was awarded Nobel Prize is:

According to the special theory of relativity

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

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ECAT Physics Chapter 19 Important MCQ's

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