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 general theory of relativity treats problems involving	A. inertial frame of references B. accelerating frame of references C. both of these 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	The Nobel Prize on the explanation of photoelectric effect was awarded to:	A. Max. Planck B. Maxwell C. Bohr D. Rutherford
4	When monochromatic light is allowed to fall on cathode, it begins to emit electrons, these electrons are called	A. thermoionic electrons B. free electrons C. photoelectrons D. slow electrons
5	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
6	An inertial frame is that frame in which	A. a>0 B. a=0 C. a<0 D. none of these
7	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:	A. Smaller B. Lerger C. Same D. Much larger
8	Max Planck received the Nobel Prize for his discovery of energy quants in:	A. 1718 AD B. 1918 AH C. 1818 AD D. 1918 AD
9	de-Broglies hypthesis was experimentally verified by	A. Maxwell B. Compton C. Einstein D. Davison and Germer
10	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

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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

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

Victor de-Brogile received the Nobel prize in physics in

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

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

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

The existence of position was predicted by Dirace in

Strictly speaking, the earth is:

In photoelectric effect the energy of ejected electrons depend on

The idea of quantization of energy was proposed by:

Converse of pair production is known as

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

Current, voltage, resistance measuring circuit is connected with the galvanometer with the help of switch, known as

When a position comes close to an electron they annihilate into photons such that

When a platinum wire is heated, it appears dull red at about

The Einstein's changes in length, mass and time are not observed in common life because

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

A black body is

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

Photocell is a device which converts

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

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

Compton shift refers to:

Absolute motion cannot be detected

Electromagnetic radiation or photons interact with matter in

Pair production is the phenomenon in which

An intertial frame of reference is a frame of reference which is

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

When a position comes close to an electron they annihilate into

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

Which of the following is not an example of intertial frame

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