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 nature of radiations emitted by a hot body depends upon its:	A. Metarial B. Temperature C. colour D. Volume
2	The special theory of relativity is based on:	A. Four postulates B. Three postulates C. Two postulates D. One postulate
3	The inside cavity of the black body is	A. painted white B. painted silver C. blackened with soot D. painted red
4	When a position comes close to an electron they annihilate into	A. one photon B. two photons which travel in the same direction C. two photons which travels in the opposite direction D. two photons which travel in any direction
5	The stopping voltage for a certain metal is 100 volts, then the work function for the cathode plate is	A. 100 J B. 1.6 x 10^-17J C. 100 eV D. 1.6 x 10^-17eV
6	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
7	Photoelectrons are emitted when ultraviolet light falls on:	A. Casium B. Silver C. Potassium D. Any of these
8	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
9	When a position comes close to an electron they annihilate into photons such that	A. each photon has energy 0.51 Me v B. each photon has energy 1.02 Me v C. each photon has energy 0.25 Me v D. none of these
10	According to the special theory of relativity, time is	A. absolute quantity B. not absolute quantity C. constant quantity D. none of these

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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 special theory of relatively treats the problems involving:

The unit of work function is:

The energy of a photon is represented by

Intensity of light determines the:

Compton shift refers to:

S.I. unit of planks constant is

In photoelectric effect the energy of ejected electrons depend on

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

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 special theory of relativity treats problems invoving

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

The positron was discovered by:

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

Which of the following phenomenon proves the particle nature of light

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

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

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

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

In order to produce pair production, a photon must have a energy

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

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

The inside cavity of the black body is

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

The value of threshold frequency for different metals is

The value of the plank's constant 'h' is given by

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

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

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

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

According to the special theory of relativity

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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