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	Converse of pair production is known as	A. Compton effect B. annihilation of matter C. photoelectric effect D. none of these
2	The energy of a photon is represented by	A. h/c² B. h/T C. hc² D. hf/c²
3	The stopping voltage for a certain metal is 100 volts, then the work function for the cathode plate is	A. 100 J B. 1.6 x 10^-17J C. 100 eV D. 1.6 x 10^-17eV
4	Compton was awarded Nobel prize in physics in	A. 1921 B. 1923 C. 1925 D. 1927
5	A particle having mass and charge equal to that of an electron is called:	A. Proton B. Positron C. Pion D. Pi-meson
6	The value of threshold frequency for different metals is	A. different B. same C. may be different or may be same D. none of these
7	The nature of radiations emitted by a hot body depends upon its:	A. Metarial B. Temperature C. colour D. Volume
8	When platinum wire is heated, it appears cherry red at	A. 1600°C B. 900°C C. 1100°C D. 1300°C
9	When platinum wire is heated, then at the temperature of 500 ^oC, it becomes:	A. Yellow B. Orange red C. Dull red D. White
10	The concept of direction and position are purely	A. absolute B. relative C. absolute or relative 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

Newton's law of motion do not hold in

The concept of direction is purely:

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

the symbol to be used in relativity problems denotes:

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

G.P. Thomson observer experimentally that electrons and neutrons possess

de-Broglies hypthesis was experimentally verified by

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

The mass of an object will be doubled at speed

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

The value of threshold frequency for different metals is

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

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

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

The length contraction happens only

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

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

Wave nature of particle was proposed by

The idea of quantization of energy was proposed by:

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

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

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

The analysis of the distribution of wavelengths of the radiation emitted from a hot body set the foundation of new mechanics, known as

At the temperature, a body emits radiation which is principally

Momentum is a parameter associated with

When a position comes close to an electron they annihilate into photons such that

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

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

Photocell is a device which converts

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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