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	de-Broglies hypthesis was experimentally verified by	A. Maxwell B. Compton C. Einstein D. Davison and Germer
2	0.1 kg mass will be equivalent to the energy	A. 9 x 10¹⁵J B. 5 x 10⁸J C. 6 x 10¹⁶J D. 9 x 10^-16J
3	The intensity of emitted energy (with wavelength) radiated from a black body at different temperatures was initially measured by:	A. Lummer B. Planck C. Pringsheim D. Both (A ) and (B)
4	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
5	Intensity of light determines the:	A. Energy of each photon B. Number of photons C. Speed of photons D. Size of photons
6	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	A. 2.9 s B. 3.0 s C. 6.6 s D. 9.6 s
7	In photoelectric effect the energy of ejected electrons depend on	A. The frequency B. The intensity C. Both frequency and intensity D. None of these
8	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
9	Wave nature of particle was proposed by	A. Einstein B. Plank C. De-Brogile D. Max well
10	Absolute motion cannot be detected	A. in its own frame of references B. in a different frame of references C. both in its frame and different frame of references 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

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

Victor de-Brogile received the Nobel prize in physics in

Wien's constant is measured in:

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

Davision and Germer performed experiment to verify

A particle of mass 5.0 mg moves with a speed of 8.0 m/s. Its de-Brogile wavelength is

Photoelectric effect takes place with a photon of:

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

The positron was discovered by:

Electromagnetic radiation or photons interact with matter in

Intensity of light determines the:

In process of annihilation of matter, the two photons produced move in opposite direction to converse

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:

A black body is

Newton's law of motion do not hold in

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

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

When a platinum wire is heated, it appears white at

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

Which of the following is not an example of intertial frame

The existence of position was predicted by Dirace in

Electromagnetic -radiation means:

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

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

Max plank received the Nobel Prize in physics for his discovery of energy quanta in

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

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

The energy of the 4th orbit in hydrogen atom is

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

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