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

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Asghar Ali 03 - Mar - 2021 10 Min 50 Sec 100/120
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khadim Hussain 03 - Mar - 2021 10 Min 50 Sec 75/120
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Ali ahmad 19 - Jul - 2018 09 Min 44 Sec 70/120
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Aarij 08 - Dec - 2024 02 Min 25 Sec 65/120
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Waleed Ahmed 26 - Feb - 2023 10 Min 00 Sec 65/120
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Ziyad Rehman Sheikh 16 - Nov - 2022 07 Min 21 Sec 40/120
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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	According to Einstein, with the great increase in the speed of the body, the relativistic mass of the body	A. Remains constant B. Decreases C. Increases to infinity D. Reduced to zero
2	As the light shines on the metal surface, the electrons are ejected	A. slowly B. instantaneously C. either of these D. none of these
3	A particle of mass 5.0 mg moves with a speed of 8.0 m/s. Its de-Brogile wavelength is	A. 1.66 m B. 1.66 x 10^-10m C. 1.66 x 10^-29cm D. 1.66 x 10^-29m
4	The special theory of relativity is based on the	A. one postulate B. two postulates C. three postulates D. four postulates
5	The special theory of relativity is based on:	A. Four postulates B. Three postulates C. Two postulates D. One postulate
6	Momentum is a parameter associated with	A. wave motion B. particle motion C. neither wave nor particle motion D. none of these
7	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. 2.9 s B. 3.0 s C. 6.6 s D. 9.6 s
8	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
9	A high temperature, the proportion of shorter wavelengths radiation, emitted by the body	A. decreases B. first increases then decreases C. increases D. any one of them
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

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

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

Photoelectric effect takes place with a photon of:

Strictly speaking, the earth is:

The concept of direction and position are purely

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

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

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

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

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

Wien's constant is measured in:

The whole shape of the black body spectrum for all wavelengths was explained by the formula proposed by

Pair production is the phenomenon in which

G.P. Thomson observer experimentally that electrons and neutrons possess

The special theory of relativity is based on the

The photon of radio-waves has energy of about

The special theory of relativity is based on:

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

In process of annihilation of matter, the two photons produced move in opposite direction to converse

Compton was awarded Nobel prize in physics in

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

There is no way to detect:

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

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

de-Broglies hypthesis was experimentally verified by

Newton's law of motion do not hold in

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

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

Compton shift refers to:

The idea of quantization of energy was proposed by:

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