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

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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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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

Sr.#	Question	Answer
1	The ratio of energy E to the corresponding frequency (f) of the radiation (emitted or absorbed) is called:	A. Wien's constant B. Stefen's constnat C. Planck's constant D. Boltzmann's constant
2	the symbol to be used in relativity problems denotes:	A. Dilated time B. Proper time C. Life time D. Half time
3	As compared to the distance measured by an observer on Earth, the distance from Earth to a star measured by an observer in a moving spaceship would seem:	A. Smaller B. Lerger C. Same D. Much larger
4	Wien's constant is measured in:	A. Metre per kelviin B. Metre kelvin C. Kelvin per meter D. Joules
5	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
6	When a platinum wire is heated, it appears white at	A. 1600°C B. 900°C C. 1100°C D. 1300°C
7	S.I. unit of planks constant is	A. J-s^-1 B. J.s C. J.s^-2 D. J.s²
8	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
9	Photoelectrons are emitted when ultraviolet light falls on:	A. Casium B. Silver C. Potassium D. Any of these
10	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

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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 photon of radio-waves has energy of about

Momentum is a parameter associated with

Practically the quantity v/c is always:

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

de-Broglies hypthesis was experimentally verified by

The length contraction happens only

The analysis of the distribution of wavelengths of the radiation emitted from a hot body set the foundation of new mechanics, known as

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

According to the special theory of relativity

According to the special theory of relativity, a moving clock

Electromagnetic radiation or photons interact with matter in

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

The general theory of relativity treats problems involving

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

Photocell is a device which converts

Compton studied the scattering of x-rays by loosely bound electrons from:

0.1 kg mass will be equivalent to the energy

When a platinum wire is heated, it appears yellow at

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

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

When platinum wire is heated, then at the temperature of 500 oC, it becomes:

The special theory of relativity treats problems invoving

The energy of a photon in a beam of infrared radiation of wavelength 1240 nm is

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

According to the special theory of relativity, time is

Which one of the following physical quantities changes with relativistic speed

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

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

The special theory of relativity is based on:

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Top Scorers Of ECAT Pre General Science Physics Chapter 19 Dawn of Modern Physics MCQ`s Test

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

When platinum wire is heated, then at the temperature of 500 ^oC, it becomes: