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 black body is	A. an ideal absorber B. an ideal radiator C. both of them D. none of them
2	Electromagnetic -radiation means:	A. Photons B. protons C. Electrons D. Mesons
3	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
4	The intensity of emitted energy (with wavelength) radiated from a black body at different temperatures was initially measured by:	A. Lummer B. Planck C. Pringsheim D. Both (A ) and (B)
5	If a body reaches a speed equal to the speed of light, then its mass will became	A. zero B. very small C. infinity D. none of these
6	When a platinum wire is heated, it appears dull red at about	A. 500°C B. 900°C C. 1100°C D. 1300°C
7	Newton's law of motion do not hold in	A. an accelerated frame of reference B. an unaccelerated frame of reference C. both of these D. none of these
8	The existence of position was predicted by Dirace in	A. 1920 B. 1925 C. 1930 D. 1928
9	When a platinum wire is heated, it appears yellow at	A. 1600°C B. 900°C C. 1100°C D. 1300°C
10	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

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

The nature of radiations emitted by a hot body depends upon its:

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

According to the Max plank, energy is redialed or absorbed in

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

Wave nature of particle was proposed by

The concept of direction is purely:

The concept of direction and position are purely

The positron was discovered by:

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

A photon is considered to have

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

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

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

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

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

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

According to the special theory of relativity, a moving clock

The general theory of relativity treats problems involving

At the temperature, a body emits radiation which is principally

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

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

Absolute motion cannot be detected

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

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

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

When monochromatic light is allowed to fall on cathode, it begins to emit electrons, these electrons are called

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

Practically the quantity v/c is always:

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

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