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 the special theory of relativity, a moving clock	A. runs faster B. runs slower C. neither runs faster nor slower D. all of these
2	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
3	The ratio of energy E to the corresponding frequency (f) of the radiation (emitted or absorbed) is called:	A. Wien's constant B. Stefen's constnat C. Planck's constant D. Boltzmann's constant
4	The energy of a photon is represented by	A. h/c² B. h/T C. hc² D. hf/c²
5	According to Einstein, with the great increase in the speed of the body the relativistic length of the body	A. Remains constant B. Decreases C. Increases D. Reduces to zero
6	Electromagnetic radiation or photons interact with matter in	A. two distinct ways B. three distinct ways C. four distinct ways D. five distinct ways
7	Wien's constant is measured in:	A. Metre per kelviin B. Metre kelvin C. Kelvin per meter D. Joules
8	A particle of mass 5.0 mg moves with a speed of 8.0 m/s. Its de-Brogile wavelength is	A. 1.66 m B. 1.66 x 10^-10m C. 1.66 x 10^-29cm D. 1.66 x 10^-29m
9	According to the de-Brogile relation, an object of large mass and ordinary speed has	A. very small wavelength B. very large wavelength C. very small frequency D. all of these
10	Momentum is a parameter associated with	A. wave motion B. particle motion C. neither wave nor particle motion D. none of these

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

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

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

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

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

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

Compton was awarded Nobel prize in physics in

The location and speed anywhere on earth can now be determined using relativistic effects by NAVISTAR to an accuracy of

The mass of an object will be doubled at speed

Momentum is a parameter associated with

The special theory of relativity treats problems invoving

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

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

Compton shift refers to:

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

The energy of a photon is represented by

The Nobel Prize on the explanation of photoelectric effect was awarded to:

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

According to the electromagnetic wave theory of light, increasing the intensity of incident light should increase the

The whole shape of the black body spectrum for all wavelengths was explained by the formula proposed by

According to Einstein, with the great increase in the speed of the body the relativistic length of the body

An inertial frame is that frame in which

According to the special theory of relativity, a moving clock

When platinum wire is heated, it appears cherry red at

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

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

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

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 a platinum wire is heated, it appears orange red at

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

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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:

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