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 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
2	According to the special theory of relativity, time is	A. absolute quantity B. not absolute quantity C. constant quantity D. none of these
3	When a high energy photon interact with a metal, which of the following effect is most likely to be taken place	A. pair production B. photoelectric effect C. Compton effect D. None of these
4	An inertial frame is that frame in which	A. a>0 B. a=0 C. a<0 D. none of these
5	Position and momentum of a particle cannot both be measured simultaneously with perfect accuracy. This is the statement of	A. photoelectric effect B. pair production C. Compton effect D. uncertainty principle
6	When a platinum wire is heated, it appears orange red at	A. 500°C B. 900°C C. 1100°C D. 1300°C
7	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
8	Compton shift refers to:	A. Photon B. Meson C. Proton D. Positron
9	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}
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

There is no way to detect:

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

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

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

A photon is considered to have

The photon of radio-waves has energy of about

According to the special theory of relativity, time is

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

Momentum is a parameter associated with

Which of the following is not an example of intertial frame

The energy of a photon is represented by

As compared to the distance measured by an observer on Earth, the distance from Earth to a star measured by an observer in a moving spaceship would seem:

The special theory of relativity treats problems invoving

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

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

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

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

A high temperature, the proportion of shorter wavelengths radiation, emitted by the body

Due to relative motion of observer and the frame of reference of events, time always:

The special theory of relativity is based on:

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

If you are moving at relativistic speed between two points that are a fixed distance apart, then the distance between the two points appers

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

0.1 kg mass will be equivalent to the energy

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

Practically the quantity v/c is always:

When a platinum wire is heated, it appears white at

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

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

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ECAT Physics Chapter 19 Important MCQ's

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