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	A particle having mass and charge equal to that of an electron is called:	A. Proton B. Positron C. Pion D. Pi-meson
2	Albert Einstein got the Nobel prize in physics for his explanation of photoelectric effect in	A. 1916 B. 1919 C. 1921 D. 1923
3	The emission of electrons from a metal surface when exposed to light of suitable frequency is called the	A. pair production B. Compton effect C. photoelectric effect D. relativity
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	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
6	The nature of radiations emitted by a hot body depends upon its:	A. Metarial B. Temperature C. colour D. Volume
7	According to the de-Brogile relation, an object of large mass and ordinary speed has	A. very small wavelength B. very large wavelength C. very small frequency D. all of these
8	The length contraction happens only	A. Opposite to the direction of motion B. along the direction of motion C. perpendicular to the direction of motion D. In any direction
9	Compton studied the scattering of x-rays by loosely bound electrons from:	A. NaCl crystal B. Graphite crystal C. Zirconia D. Copper crystal
10	Max plank founded a mathematical model resulting in an equation that describes the shape of observed black body radiation curves exactly, in	A. 1890 B. 1895 C. 1900 D. 1905

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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 photoelectric effect, the maximum energy of photoelectrons depends on the

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

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

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

S.I. unit of planks constant is

Which one of the following physical quantities changes with relativistic speed

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

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

An inertial frame is that frame in which

The threshold frequency of sodium is 6 x 106MHz. The cut-off wavelength for this metal will be

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

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

Pair production is the phenomenon in which

Position and momentum of a particle cannot both be measured simultaneously with perfect accuracy. This is the statement of

A particle having mass and charge equal to that of an electron is called:

Photocell is a device which converts

When a platinum wire is heated, it appears yellow at

When the atomic particle are moving with velocities approaching that of light:

Momentum is a parameter associated with

The general theory of relativity treats problems involving

Electromagnetic radiation or photons interact with matter in

In photoelectric effect the energy of ejected electrons depend on

The concept of direction is purely:

When platinum wire is heated, it appears cherry red at

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

When platinum wire is heated, then at the temperature of 500 oC, it becomes:

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

Photoelectric effect takes place with a photon of:

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 intensity of emitted energy (with wavelength) radiated from a black body at different temperatures was initially measured by:

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ECAT Physics Chapter 19 Important MCQ's

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The threshold frequency of sodium is 6 x 10⁶MHz. The cut-off wavelength for this metal will be

When platinum wire is heated, then at the temperature of 500 ^oC, it becomes: