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	Which of the following is not an example of intertial frame	A. a body placed on the surface of earth B. a body placed in a car moving with uniform velocity C. a body placed in a car moving with same acceleration D. none of these
2	The special theory of relativity is based on the	A. one postulate B. two postulates C. three postulates D. four postulates
3	If a material object moves with the speed of light 'C' its mass becomes	A. Equal to its rest mass B. Four times of its rest mass C. Double of its rest mass D. Infinite
4	The analysis of the distribution of wavelengths of the radiation emitted from a hot body set the foundation of new mechanics, known as	A. classical mechanics B. Newtonian mechanics C. quantum mechanics D. statistical mechanics
5	There is certain frequency below which no electrons are emitted from the metal surface, this frequency is known as	A. maximum frequency B. minimum frequency C. threshold frequency D. all of these
6	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
7	When a platinum wire is heated, it appears dull red at about	A. 500°C B. 900°C C. 1100°C D. 1300°C
8	The value of the Stephen's constant for black body radiations is given by	A. 5.6 x 10⁸Wm^-2K^-4 B. 5.67 x 10^-8Wm^-2K^-4 C. 2.9 x 10^-3mK D. 2.9 x 10³mK
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	The mass of an object will be doubled at speed	A. 1.6 x 10⁸ms^-1 B. 2.6 X 10⁸ms^-1 C. 2.6 x 10⁷ms^-1 D. 2.6 x 10⁹ms^-1

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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 mass of an object will be doubled at speed

The photon of radio-waves has energy of about

de-Broglies hypthesis was experimentally verified by

Which one of the following physical quantities changes with relativistic speed

The special theory of relativity is based on the

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

The positron was discovered by:

The inside cavity of the black body is

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

Position was discovered by Carl Anderson in

If A represents linear momentum and c, the velocity of light, then unit of pc in international system of units is:

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

According to the special theory of relativity, a moving clock

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

When a position comes close to an electron they annihilate into

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

Which of the following is not an example of intertial frame

Converse of pair production is known as

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

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

The year when A.H. compton was awarded Nobel Prize is:

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

Victor de-Brogile received the Nobel prize in physics in

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

The location and speed anywhere on earth can now be determined using relativistic effects by NAVISTAR to an accuracy of

The length contraction happens only

If the radius of first orbit of hydrogen atom is 0.53° A the radius of second orbit will be

The mass 'm' of a body moving at 0.8 c (whose rest mass is mo) becomes

An inertial frame is that frame in which

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