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	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
2	The energy of a photon is represented by	A. h/c² B. h/T C. hc² D. hf/c²
3	The length contraction happens only	A. Opposite to the direction of motion B. along the direction of motion C. perpendicular to the direction of motion D. In any direction
4	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
5	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
6	Strictly speaking, the earth is:	A. An accelerated frame of reference B. A non-inertial frame of reference C. An inertial frame of reference D. ^{A non-accelerated frame of reference}
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	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
9	An electron is accelerated through a potential difference of 50v. its de-Brogile wavelength is	A. 1.66 x 10^-29m B. 1.74 x 10^-10cm C. 17.4 x 10^-6m D. 1.74 x 10^-10m
10	The Einstein's changes in length, mass and time are not observed in common life because	A. We dont observer then seriously B. The masses are too large C. Their speed is too small than the speed of right D. All of the above

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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

According to the special theory of relativity, time is

There is certain frequency below which no electrons are emitted from the metal surface, this frequency is known as

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

When the atomic particle are moving with velocities approaching that of light:

The energy of a photon is represented by

Newton's law of motion do not hold 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

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

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

Which of the following is not an example of intertial frame

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

There is no way to detect:

The idea of quantization of energy was proposed by:

the symbol to be used in relativity problems denotes:

Photoelectric effect takes place with a photon of:

The concept of direction and position are purely

In photoelectric effect the energy of ejected electrons depend on

According to the special theory of relativity

The ratio of energy E to the corresponding frequency (f) of the radiation (emitted or absorbed) is called:

The special theory of relativity is based on:

Momentum is a parameter associated with

The existence of position was predicted by Dirace in

Compton was awarded Nobel prize in physics in

When a platinum wire is heated, it appears white at

With the help of 50 K v electron microscope, a resolution of

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

Pair production is the phenomenon in which

The concept of direction is purely:

If you are moving at relativistic speed between two points that are a fixed distance apart, then the distance between the two points appers

Wien's constant is measured in:

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