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	If the radius of first orbit of hydrogen atom is 0.53° A the radius of second orbit will be	A. 2.120°A B. 0.212°A C. 21.2°A D. 0.14° a
2	According to the electromagnetic wave theory of light, increasing the intensity of incident light should increase the	A. number of photoelectrons B. size of the photoelectrons C. charge on photoelectrons D. K.E of photoelectrons
3	The location and speed anywhere on earth can now be determined using relativistic effects by NAVISTAR to an accuracy of	A. 2 cm/s B. 20 cm/s C. 200 cm/s D. 2000 cm/s
4	Photoelectric effect takes place with a photon of:	A. Very high energy B. Very low energy C. Low energy D. High energy
5	Compton derived an expression to find compton shift by applying to the process, the law of conservation of:	A. Energy only B. Momentum only C. Mass only D. Charge only
6	At the temperature, a body emits radiation which is principally	A. of long wavelengths in the visible region B. of long wavelengths in the invisible infrared region C. of short wavelength in invisible ultraviolet region D. none of these
7	The emission of electrons from a metal surface when exposed to light of suitable frequency is called the	A. pair production B. Compton effect C. photoelectric effect D. relativity
8	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}
9	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
10	Victor de-Brogile received the Nobel prize in physics in	A. 1925 B. 1929 C. 1932 D. 1935

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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

The idea of quantization of energy was proposed by:

The concept of direction and position are purely

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

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

The special theory of relativity is based on:

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

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

The positron was discovered by:

Which of the following phenomenon proves the particle nature of light

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

Absolute motion cannot be detected

An inertial frame is that frame in which

Newton's law of motion do not hold in

Which of the following is not an example of intertial frame

The special theory of relatively treats the problems involving:

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

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

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

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

As the light shines on the metal surface, the electrons are ejected

The value of the Stephen's constant for black body radiations is given by

Compton was awarded Nobel prize in physics in

When a platinum wire is heated, it appears dull red at about

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

Wien's constant is measured in:

The special theory of relativity treats problems invoving

When a position comes close to an electron they annihilate into

A particle having mass and charge equal to that of an electron is called:

Victor de-Brogile received the Nobel prize in physics in

According to the special theory of relativity, time is

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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