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	When the atomic particle are moving with velocities approaching that of light:	A. Newton's laws become valid B. Relativistic effects become prominent C. Botha(A) and (B) are valid D. Neither (A)nor (B)
2	If you are moving at relativistic speed between two points that are a fixed distance apart, then the distance between the two points appers	A. larger B. shorter C. equal D. none of these
3	Which of the following is not an example of intertial frame	A. a body placed on the surface of earth B. a body placed in a car moving with uniform velocity C. a body placed in a car moving with same acceleration D. none of these
4	When a platinum wire is heated, it appears dull red at about	A. 500°C B. 900°C C. 1100°C D. 1300°C
5	When a platinum wire is heated, it appears white at	A. 1600°C B. 900°C C. 1100°C D. 1300°C
6	Position was discovered by Carl Anderson in	A. 1920 B. 1925 C. 1928 D. 1932
7	In the compton's effect, it is found that the wavelength of incident x-rays is	A. greater than the wavelength of scattered x-rays B. equal to the wavelength of scattered x-rays C. less than the wavelength of scattered x-rays D. any one of these
8	The concept of direction is purely:	A. Absolute B. Relative C. Relative to stars always D. Relative to the sun always
9	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
10	The idea of quantization of energy was proposed by:	A. Einstein B. Max.Planck C. Maxwell D. Bohr

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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

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 photon is considered to have

S.I. unit of planks constant is

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

The Stephen-Boltzmann law for the black body radiation is given by

A black body is

The special theory of relativity treats problems invoving

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

Compton shift refers to:

Compton was awarded Nobel prize in physics in

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

Which of the following phenomenon proves the particle nature of light

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

In order to produce pair production, a photon must have a energy

Intensity of light determines the:

Photoelectrons are emitted when ultraviolet light falls on:

According to the special theory of relativity, time is

The energy of photon 'E' is proported to

The nature of radiations emitted by a hot body depends upon its:

Albert Einstein got the Nobel prize in physics for his explanation of photoelectric effect in

The energy of a photon is represented by

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

the dilation of time applies to the timing processes which are:

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

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

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

the symbol to be used in relativity problems denotes:

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

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

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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