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	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
2	The energy of a photon is represented by	A. h/c² B. h/T C. hc² D. hf/c²
3	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
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	The positron was discovered by:	A. In cosmic radiation B. In 1932 C. By Carl Anderson D. All above
6	As the light shines on the metal surface, the electrons are ejected	A. slowly B. instantaneously C. either of these D. none of these
7	Photocell is a device which converts	A. chemical energy into electrical energy B. electrical energy into light energy C. heat energy into electrical energy D. light energy into electrical energy
8	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
9	When platinum wire is heated, it appears cherry red at	A. 1600°C B. 900°C C. 1100°C D. 1300°C
10	In process of annihilation of matter, the two photons produced move in opposite direction to converse	A. momentum B. charge C. energy D. mass

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

A black body is

Position was discovered by Carl Anderson in

Which of the following phenomenon proves the particle nature of light

Electromagnetic radiation or photons interact with matter in

The intensity of emitted energy (with wavelength) radiated from a black body at different temperatures was initially measured by:

The mass of an object will be doubled at speed

Momentum is a parameter associated with

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

Davision and Germer performed experiment to verify

Wave nature of particle was proposed by

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:

The value of the plank's constant 'h' is given by

Compton shift refers to:

When platinum wire is heated, it appears cherry red at

When a platinum wire is heated, it appears white at

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

the symbol to be used in relativity problems denotes:

Newton's law of motion do not hold in

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

Compton was awarded Nobel prize in physics in

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

According to the de-Brogile relation, an object of large mass and ordinary speed has

A photon is considered to have

Which one of the following physical quantities changes with relativistic speed

An intertial frame of reference is a frame of reference which is

Practically the quantity v/c is always:

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

The existence of position was predicted by Dirace in

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ECAT Physics Chapter 19 Important MCQ's

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