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 way through which electromagnetic radiations or photons interact with matter depends upon their:	A. Wavelength B. Frequency C. Energy D. Temperature
2	According to the special theory of relativity	A. mass and energy are same entities B. mass and energy are same entities but interconverible C. mass and energy are different entities but interconverible D. mass and energy are different entities but non-interconveritble
3	Compton was awarded Nobel prize in physics in	A. 1921 B. 1923 C. 1925 D. 1927
4	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
5	Converse of pair production is known as	A. Compton effect B. annihilation of matter C. photoelectric effect D. none of these
6	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
7	If a body reaches a speed equal to the speed of light, then its mass will became	A. zero B. very small C. infinity D. none of these
8	The energy of the 4th orbit in hydrogen atom is	A. 2.5 ev B. - 3.5 ev C. -0.85 ev D. -13.6 ev
9	The energy of a photon in a beam of infrared radiation of wavelength 1240 nm is	A. 100 ev B. 10⁶e v C. 10³e v D. 1.0 e v
10	S.I. unit of planks constant is	A. J-s^-1 B. J.s C. J.s^-2 D. J.s²

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

Position was discovered by Carl Anderson in

When platinum wire is heated, it appears cherry red at

The mass of an object will be doubled at speed

The photon of radio-waves has energy of about

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

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

Practically the quantity v/c is always:

The way through which electromagnetic radiations or photons interact with matter depends upon their:

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

The length contraction happens only

Davision and Germer performed experiment to verify

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

Intensity of light determines the:

The concept of direction is purely:

0.1 kg mass will be equivalent to the energy

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

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

The positron was discovered by:

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

The special theory of relatively treats the problems involving:

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

Which of the following is not an example of intertial frame

Absolute motion cannot be detected

The concept of direction and position are purely

The Stephen-Boltzmann law for the black body radiation is given by

S.I. unit of planks constant is

Electromagnetic radiation or photons interact with matter in

If a material object moves with the speed of light 'C' its mass becomes

Which of the following phenomenon proves the particle nature of light

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ECAT Physics Chapter 19 Important MCQ's

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