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 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
2	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
3	When a position comes close to an electron they annihilate into	A. one photon B. two photons which travel in the same direction C. two photons which travels in the opposite direction D. two photons which travel in any direction
4	The energy of a photon is represented by	A. h/c² B. h/T C. hc² D. hf/c²
5	Photoelectric effect takes place with a photon of:	A. Very high energy B. Very low energy C. Low energy D. High energy
6	0.1 kg mass will be equivalent to the energy	A. 9 x 10¹⁵J B. 5 x 10⁸J C. 6 x 10¹⁶J D. 9 x 10^-16J
7	Newton's law of motion do not hold in	A. an accelerated frame of reference B. an unaccelerated frame of reference C. both of these D. none of these
8	Converse of pair production is known as	A. Compton effect B. annihilation of matter C. photoelectric effect D. none of these
9	When a platinum wire is heated, it appears yellow at	A. 1600°C B. 900°C C. 1100°C D. 1300°C
10	Albert Einstein got the Nobel prize in physics for his explanation of photoelectric effect in	A. 1916 B. 1919 C. 1921 D. 1923

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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

When a position comes close to an electron they annihilate into

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

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

0.1 kg mass will be equivalent to the energy

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:

When a high energy photon interact with a metal, which of the following effect is most likely to be taken place

the symbol to be used in relativity problems denotes:

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

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

According to the special theory of relativity, time is

A high temperature, the proportion of shorter wavelengths radiation, emitted by the body

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

The idea of quantization of energy was proposed by:

Practically the quantity v/c is always:

If A represents linear momentum and c, the velocity of light, then unit of pc in international system of units is:

The concept of direction is purely:

S.I. unit of planks constant is

Absolute motion cannot be detected

Compton was awarded Nobel prize in physics in

The special theory of relatively treats the problems involving:

When a platinum wire is heated, it appears white at

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

When low energy photon interact with a metal,which of the following effect is likely to be taken place

Current, voltage, resistance measuring circuit is connected with the galvanometer with the help of switch, known as

The energy of the 4th orbit in hydrogen atom is

The inside cavity of the black body is

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

Davision and Germer performed experiment to verify

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

Which of the following phenomenon proves the particle nature of light

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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: