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 threshold frequency of sodium is 6 x 10⁶MHz. The cut-off wavelength for this metal will be	A. 500 m B. 500 nm C. 500 km D. 500 cm
2	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
3	The special theory of relativity treats problems invoving	A. inertial frame of references B. accelerating frame of references C. both of these D. none of these
4	Electromagnetic -radiation means:	A. Photons B. protons C. Electrons D. Mesons
5	If you are moving at relativistic speed between two points that are a fixed distance apart, then the distance between the two points appers	A. larger B. shorter C. equal D. none of these
6	Photoelectric effect takes place with a photon of:	A. Very high energy B. Very low energy C. Low energy D. High energy
7	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
8	Which one of the following physical quantities changes with relativistic speed	A. Length B. Mass C. Time D. All of the above
9	When low energy photon interact with a metal,which of the following effect is likely to be taken place	A. pair production B. photoelectric C. Compton effect D. None of these
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 analysis of the distribution of wavelengths of the radiation emitted from a hot body set the foundation of new mechanics, known as

According to the Max plank, energy is redialed or absorbed 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

Which of the following phenomenon proves the particle nature of light

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

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

Electromagnetic radiation or photons interact with matter in

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

Compton was awarded Nobel prize in physics in

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

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

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

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

The special theory of relativity is based on the

When platinum wire is heated, it appears cherry red at

Electromagnetic -radiation means:

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

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

Pair production is the phenomenon in which

The photon of radio-waves has energy of about

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

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

0.1 kg mass will be equivalent to the energy

Strictly speaking, the earth is:

At the temperature, a body emits radiation which is principally

According to the special theory of relativity

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

Albert Einstein got the Nobel prize in physics for his explanation of photoelectric effect in

The concept of direction is purely:

An inertial frame is that frame in which

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