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 existence of position was predicted by Dirace in	A. 1920 B. 1925 C. 1930 D. 1928
2	de-Broglies hypthesis was experimentally verified by	A. Maxwell B. Compton C. Einstein D. Davison and Germer
3	Photoelectric effect takes place with a photon of:	A. Very high energy B. Very low energy C. Low energy D. High energy
4	The energy of a photon is represented by	A. h/c² B. h/T C. hc² D. hf/c²
5	At the temperature, a body emits radiation which is principally	A. of long wavelengths in the visible region B. of long wavelengths in the invisible infrared region C. of short wavelength in invisible ultraviolet region D. none of these
6	A black body is	A. an ideal absorber B. an ideal radiator C. both of them D. none of them
7	If A represents linear momentum and c, the velocity of light, then unit of pc in international system of units is:	A. Newton B. Joule C. Joule-Sec D. Joule-s^-1
8	Intensity of light determines the:	A. Energy of each photon B. Number of photons C. Speed of photons D. Size of photons
9	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
10	Davision and Germer performed experiment to verify	A. de-Brogile hypothesis B. theory of relativity C. Newton's law of gravitation D. Mass-energy relation

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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

Wien's constant is measured in:

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

If a body reaches a speed equal to the speed of light, then its mass will became

The special theory of relativity is based on:

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

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

At the temperature, a body emits radiation which is principally

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

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

The positron was discovered by:

Electromagnetic -radiation means:

Compton studied the scattering of x-rays by loosely bound electrons from:

Converse of pair production is known as

Max Planck received the Nobel Prize for his discovery of energy quants in:

Which of the following is not an example of intertial frame

The special theory of relatively treats the problems involving:

When platinum wire is heated, it appears cherry red at

The concept of direction is purely:

An inertial frame is that frame in which

According to the special theory of relativity

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

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

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

Newton's law of motion do not hold in

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

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

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

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

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

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

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Top Scorers Of ECAT Pre General Science Physics Chapter 19 Dawn of Modern Physics MCQ`s Test

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