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	The mass 'm' of a body moving at 0.8 c (whose rest mass is mo) becomes	A. 2 mo B. 1.67 mo C. 0.67 mo D. 2.67 mo
2	An intertial frame of reference is a frame of reference which is	A. at rest B. moving with uniform velocity C. either at rest or moving with uniform velocity D. none of these
3	The way through which electromagnetic radiations or photons interact with matter depends upon their:	A. Wavelength B. Frequency C. Energy D. Temperature
4	When a position comes close to an electron they annihilate into photons such that	A. each photon has energy 0.51 Me v B. each photon has energy 1.02 Me v C. each photon has energy 0.25 Me v D. none of these
5	The Nobel Prize on the explanation of photoelectric effect was awarded to:	A. Max. Planck B. Maxwell C. Bohr D. Rutherford
6	Intensity of light determines the:	A. Energy of each photon B. Number of photons C. Speed of photons D. Size of photons
7	The energy of photon 'E' is proported to	A. The magnetic field H B. The electric field E C. Both the electric and magnetic field H and E D. Frequency
8	The concept of direction and position are purely	A. absolute B. relative C. absolute or relative D. none of these
9	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
10	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

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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 energy of the 4th orbit in hydrogen atom is

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

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

de-Broglies hypthesis was experimentally verified by

The length contraction happens only

When a platinum wire is heated, it appears yellow at

Momentum is a parameter associated with

Max Planck received the Nobel Prize for his discovery of energy quants in:

Strictly speaking, the earth is:

When a platinum wire is heated, it appears white at

Max plank founded a mathematical model resulting in an equation that describes the shape of observed black body radiation curves exactly, in

From the theory of relativity, momentum p of the photon is related to energy as

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

The general theory of relativity treats problems involving

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

Intensity of light determines the:

Practically the quantity v/c is always:

The special theory of relativity treats problems invoving

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

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

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

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

The photoelectric effect, the maximum energy of photoelectrons depends on the

Which of the following is not an example of intertial frame

Davision and Germer performed experiment to verify

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

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

Compton was awarded Nobel prize in physics in

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

Photoelectric effect takes place with a photon of:

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ECAT Physics Chapter 19 Important MCQ's

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