ECAT Pre General Science Chapter 19 online mcq test with answers for Physics chapter 19 (Dawn of Modern Physics)

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maha 01 - Mar - 2023 04 Min 24 Sec 35/120

ECAT Physics Chapter 19 Important MCQ's

Sr.#	Question	Answer
1	Albert Einstein got the Nobel prize in physics for his explanation of photoelectric effect in	A. 1916 B. 1919 C. 1921 D. 1923
2	Momentum is a parameter associated with	A. wave motion B. particle motion C. neither wave nor particle motion D. none of these
3	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
4	Position and momentum of a particle cannot both be measured simultaneously with perfect accuracy. This is the statement of	A. photoelectric effect B. pair production C. Compton effect D. uncertainty principle
5	The idea of quantization of energy was proposed by:	A. Einstein B. Max.Planck C. Maxwell D. Bohr
6	Pair production is the phenomenon in which	A. matter is converted into energy B. energy is converted into matter C. light is converted into electrical energy D. electrical energy is converted into light
7	The Einstein's changes in length, mass and time are not observed in common life because	A. We dont observer then seriously B. The masses are too large C. Their speed is too small than the speed of right D. All of the above
8	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
9	If the radius of first orbit of hydrogen atom is 0.53° A the radius of second orbit will be	A. 2.120°A B. 0.212°A C. 21.2°A D. 0.14° a
10	G.P. Thomson observer experimentally that electrons and neutrons possess	A. particle-like properties B. wave-like properties C. neither particle nor wave like properties 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

Compton was awarded Nobel prize in physics in

The value of threshold frequency for different metals is

Davision and Germer performed experiment to verify

The special theory of relativity treats problems invoving

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

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

When a platinum wire is heated, it appears white at

The existence of position was predicted by Dirace in

There is certain frequency below which no electrons are emitted from the metal surface, this frequency is known as

The photon of radio-waves has energy of about

The ratio of energy E to the corresponding frequency (f) of the radiation (emitted or absorbed) is called:

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

Converse of pair production is known as

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

Wien's constant is measured 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

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

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

Newton's law of motion do not hold in

The length contraction happens only

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

When a platinum wire is heated, it appears orange red at

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

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

The positron was discovered by:

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

the dilation of time applies to the timing processes which are:

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

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

de-Broglies hypthesis was experimentally verified 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